To see the other types of publications on this topic, follow the link: Tension roller.
Journal articles on the topic 'Tension roller'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 journal articles for your research on the topic 'Tension roller.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.
1
Shin, Woojoo, Myungsung Kim, Taehyun Lee, Dongwoo Kang, JaeWon Shim, and Yongjin Kim. "Investigation of friction coefficient to improve traction condition in R2R transport system." AIP Advances 13, no. 1 (2023): 015210. http://dx.doi.org/10.1063/5.0131670.
Full textAbstract:
In a roll-to-roll (R2R) system, the roller’s traction force for precision transportation is crucial for the commercialization of printed electronic devices. Moreover, greater traction force of the roller can prevent several issues, such as slippage, wrinkles, sagging, and air entrainment, which occur because of insufficient traction force. The wrap angle, tension, and friction coefficient between the roller and the transporting film are key factors for achieving greater traction force in an R2R transport system. However, design of the wrap angle and tension are limited by the film damage and complex arrangement of the rollers. For these reasons, this study focused on the method that increases the friction coefficient on the surface of the roller. We applied three methods—normal force, static electricity, and thin polydimethylsiloxane coating—on the surface of the roller. Then, we suggest an effective means of improving the friction coefficient to supplement the design restrictions of tension and the wrap angle in R2R transport systems.
2
Lanaspeze, Gabriel, Bérengère Guilbert, Lionel Manin, and Fabrice Ville. "Preliminary modelling of power losses in roller chain drive: application to single speed cycling." Mechanics & Industry 23 (2022): 27. http://dx.doi.org/10.1051/meca/2022026.
Full textAbstract:
A quasi-static chain drive model is proposed. This model, consistent with single speed cycling application, applies to simple two sprocket drives. The kinematics of the transmission is determined, including the capture and release positions of the rollers and the influence of the polygonal effect. The tensions into the links and the contact forces (between rollers and sprocket) are then calculated based on the results of the kinematic analysis. Both chain strands are assumed to be straight and their tension are considered as imposed. An estimate of the roller displacement is proposed using existing studies on the relationship between loading conditions and roller positions along the sprocket tooth profile. The presented model, is then used to assess the contribution of both meshing and roller motion on the global efficiency of the drive. Calculations show that the magnitude of both loss sources is similar for a wide range of gear ratios and loading conditions. According to the presented results, the relative motion between the rollers and the sprocket tooth profile should be considered in future studies dedicated to chain drive efficiency.
3
Li, Li, Huan Yan, Ru Long Sheng, Min Li, and Yue Ming Wang. "Optimization of Tension Control System for Cold Rolling Exit Section." Advanced Materials Research 1044-1045 (October 2014): 825–28. http://dx.doi.org/10.4028/www.scientific.net/amr.1044-1045.825.
Full textAbstract:
Through theoretical analysis of the working condition of the tension roller and stress, user can discuss the main reasons of tension roller slip, and put forward the preventive measures to eliminate tension roller slip by using Euler formula and the research on the tension roller slip phenomenon of cold rolling. This technology has significant practical meaning for improving both the quality and efficiency of product.
4
Mu¨ftu¨, Sinan, and John J. Jagodnik. "Traction Between a Web and a Smooth Roller." Journal of Tribology 126, no. 1 (2004): 177–84. http://dx.doi.org/10.1115/1.1631014.
Full textAbstract:
Web traction over rollers is known to deteriorate due to air entrainment at high web speeds. In this paper, a general model is presented to predict the traction capability of an impermeable web over a smooth roller. The model considers the effects of the web and roller speeds, roller radius, combined roughness of the two surfaces, web tension and thickness, friction coefficient, and compressible air bearing. The change of tension ΔN due to mechanical slip between the roller and the web is calculated by a simultaneous solution of the in-plane and out-of-plane equilibrium of the web and the compressible Reynolds lubrication equation. The problem is nondimensionalized and the effects of nine of the eleven nondimensional parameters on traction are investigated for a range of values. Formulas involving the nondimensional parameters for the traction capability are presented in two-variable polynomial forms.
5
Lodge, C. J., and S. C. Burgess. "A model of the tension and transmission efficiency of a bush roller chain." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 216, no. 4 (2001): 385–94. http://dx.doi.org/10.1243/0954406021525179.
Full textAbstract:
This paper describes an improved chain link tension model for a simple two-sprocket roller chain drive. The model includes modified versions of previous models of the tension in the chain links, together with a new model for low-slack span tensions. The model allows the tension of a link to be calculated at any point in the chain drive more quickly and for a wider range of tight and slack span tensions than before. A new chain efficiency model is formulated, based on the losses due to sliding friction. Coupled with the chain link tension model, this can be used to predict the transmission efficiency of a chain. Experimental work undertaken on 0.5 in pitch industrial roller chains and bicycle chains has demonstrated that the chain efficiency model is accurate for moderate and high torque transmissions. At low torque, losses due to impact, adhesion and/or vibration become more significant and impair the accuracy of the model, particularly for heavier, industrial roller chains. The chain efficiency model enables certain design trade-offs to be carried out, such as the selection of the size of the overall system to achieve the right balance of transmission efficiency and weight.
6
Krasnov, M. L., P. L. Kachurin, S. G. Vishnyakov, et al. "SELF-OSCILLATION OF THE TENSION STATIONS OF AN ETCHING UNIT COMBINED WITH THE TANDEM COLD-ROLLING MILL 2000." Bulletin of the South Ural State University series "Mechanical engineering industry" 23, no. 2 (2023): 61–71. http://dx.doi.org/10.14529/engin230206.
Full textAbstract:
On multi-cage cold rolling mills combined with a continuous etching unit, self-oscillations can occur not only on the mill stands but also on the tensioning stations of the etching unit. Fatigue cracks can appear on the rollers of the tension stations, and characteristic defects can appear on the surface of the polyurethane-coated roller. To measure self-oscillations, MEMS accelerometers are installed on the roller bearing supports. The collection of vibrational data takes place in parallel with the measurement of technological parameters. Time series databases are used for data storage. The hybrid database allows the simultaneous processing of technological and vibrational parameters. When an emergency situation occurs, it is possible to chart the dependence of self-oscillations on the technological parameters. Using the results of an industrial experiment, it was possible to obtain the characteristic of the friction of the rolled strip on the roller of the tension station at low strip movement speeds. At band speeds from 0.5 m/s to 1 m/s, the friction characteristic is in a transient mode and can be either positive or negative. With a negative characteristic of friction, self-oscillation appears, with a positive characteristic, the movement of the belt stabilizes. Signal processing was carried out using Fast Fourier Transform (FFT). According to the spectral characteristic, it is possible to determine the number of complete cycles acting on the oscillatory system. Having a sufficient amount of information in time, it is possible to calculate the number of cycles and estimate the residual resource before cracks appear on the end surfaces of the roller of the tensioning station.
7
Zhang, Jiansheng, Guiqian Xiao, Jie Peng, Yingyan Yu, and Jie Zhou. "Gradient Structure Design and Welding-Hammering Hybrid Remanufacturing Process of Continuous Casting Rollers." Materials 15, no. 23 (2022): 8588. http://dx.doi.org/10.3390/ma15238588.
Full textAbstract:
To improve the service life and reduce the repair cost of continuous casting rollers, a new welding-hammering hybrid remanufacturing process in which the roller was designed with a gradient structure was proposed, and corresponding equipment was developed. First, the failure modes and their causes for a continuous casting roller were analyzed by numerical simulation. The cyclic tension–compression shear stress, cyclic tension–compression normal stress, thermal cycle, and highly corrosive environment caused fatigue cracking and overall peeling of the roller surface. Second, the gradient structure composed of a base layer, transition layer, and strengthened layer of a continuous casting roller was designed, and materials for each layer were selected according to their different service conditions. Third, novel equipment for continuous welding-hammering composite remanufacturing was developed, and the optimized process parameters were obtained through welding experiments. Finally, an application test was carried out; the microscopic analysis showed that refined grains, fewer welding defects, and better surface toughness were obtained. Compared with traditional remanufacturing processes without hammering, the welding-hammering hybrid process achieved a forged structure instead of as-cast structure, which significantly improved the service life of the continuous casting roller by about 100%.
8
Sarathkrishna, V. S. Sruthi M. "EFFICIENT WEB TAPE SPEED CONTROL SYSTEM USING PID." GLOBAL JOURNAL OF ENGINEERING SCIENCE AND RESEARCHES [AIVESC-18] (April 26, 2018): 16–21. https://doi.org/10.5281/zenodo.1230358.
Full textAbstract:
In most of printing press industries, tension control is considered to be the most critical mechanism. This is common in tape/similar belts where roller movement is controlled through a closed loop system. The rotation of rollers is directly related to tension of tape during the winding process to maintain a balanced rotation. In order to improve the performance of this system, PID controllers are used in this project. This controller is used to compare with the measured speed-tension values with the threshold value and accordingly controls the device. The advantage of PID control helps to maintain a uniform movement of rollers. The expected outcome of this project is to keep the system cost effective with an efficient tension control mechanism.
9
Krasnov, M. L., P. L. Kachurin, S. G. Vishnyakov, et al. "Influence of the speed of stretching the rolled strip on the occurrence of self-oscillations of the tension station of the cold rolling mill 2000." Bulletin of the South Ural State University series "Mechanical engineering industry" 23, no. 4 (2023): 58–68. http://dx.doi.org/10.14529/engin230405.
Full textAbstract:
The self-oscillations of the roller of the tension station of the loop accumulator of the cold rolling mill lead to the appearance of cracks on the outer surfaces of the roller during operation. In order to determine the causes of self-oscillations of the crack, we conducted a screening industrial experiment to assess the influence of technological and diagnostic parameters on the state of the tension station of the etching unit of mill 2000. The database of technological and vibration parameters of the mill and the roller of the tension station is a single hybrid database combined with a graphical shell. An industrial experiment is, as a rule, a passive experiment. It is an experiment in which the experimenter does not have the opportunity to interfere in the process of conducting the experiment. But in the case of a cold rolling mill, one single independent experiment requires only 5–6 minutes. Each roll is of different thickness, width, different chemical composition and, accordingly, with different mechanical properties. In addition, the rolling speed, strip tension, strip compression, different friction forces at the tension station are different. Each roll is an independent experiment. If information about technological and diagnostic parameters is stored for a long time, for example, a year or two, this information is enough to work with it as with a laboratory experiment. With a time lag, but with enough information to plan the experiment. It is only necessary to select information from the data array that corresponds to the experiment plan. Using a database a Digital Twin, we carried out an industrial experiment to determine the conditions for the occurrence of self-oscillations of the roller of the tension station and the rolled strip. The results obtained revealed a clear dependence of the occurrence of HC8 self-oscillations on the speed of stretching the strip at the time of cutting out a non-metallic inclusion (Class 3). The stretching speed should be in the range from 0.5 to 1.0 m/s. At stretching speeds in the range from 2.0 to 2.5 m/s, self-oscillations do not occur. There are no conditions for the occurrence of cracks on the end surfaces of the roller.
10
Nagarkatti, Siddharth P., Fumin Zhang, Christopher D. Rahn, and Darren M. Dawson. "Tension and Speed Regulation for Axially Moving Materials." Journal of Dynamic Systems, Measurement, and Control 122, no. 3 (1999): 445–53. http://dx.doi.org/10.1115/1.1286270.
Full textAbstract:
During continuous manufacture of axially moving materials such as fiber, paper, foil, and film, accurate speed and tension control are essential. In this paper, control torques applied to rollers at the boundaries of an axially moving system regulate the material speed and tension using speed and tension sensors for each roller. Given a distributed parameter model, Lyapunov techniques are used to develop a model-based boundary control system that exponentially stabilizes the material tension and speed at desired setpoints and stabilizes longitudinal vibration. Experimental results compare the tension and speed setpoint regulation provided by the proposed control strategy with proportional plus integral speed control and proportional tension feedback. [S0022-0434(00)00203-3]
11
Krasnov, M. L., P. L. Kachurin, S. G. Vishnyakov, et al. "Cracking of the roller of the tension station of the loop accumulator of the tandem cold rolling mill 2000." Bulletin of the South Ural State University series "Mechanical engineering industry" 23, no. 3 (2023): 63–75. http://dx.doi.org/10.14529/engin230306.
Full textAbstract:
In the event of self-oscillation of the roller of the tension station of the loop accumulator of the cold rolling mill, cracks appear on the outer surfaces of the roller during operation. Determining the causes of cracking and assessing the residual life of the roller of the tension station is an urgent task. A digital double of the tension station of the loop accumulator of the cold rolling mill has been developed in accordance with the classification of Michael Reeves and in accordance with the standard GOST R 57700.37-2021 “Computer models and modeling. Digital doubles of products”. The technological parameters and diagnostic data used, reflected and stored in an environment external to the industrial facility, represent a “digital shadow”. Databases of technological and vibration parameters of the mill and the roller of the tension station are combined by a graphical shell. A numerical 3-dimensional model of a tensioning station roller is constructed. The eigenforms and eigenfrequencies of the oscillations are determined. The lower eigenforms obtained by calculation are consistent with the vibration frequencies of the bearing supports of the tensioning roller stored in the digital footprint of the mill. At high frequencies, a mixed form of oscillations is observed (shell oscillations, and bending of the semi-axes) which also has an approximate match on the vibrograms of the digital footprint. Vibration acceleration and loading cycles of the bearing supports of the tension station are associated with the use of a virtual industrial experiment. The numerical 3- dimensional model of the tensioning station roller determines the real loads acting on the end surfaces of the roller when self-oscillations of the tensioning station occur. Information about the frequency and amplitude of vibrations allows you to calculate the number of loading cycles and estimate the residual resource before cracks occur on the end surfaces of the roller of the tension station.
12
Zhang, Ji, Sihua Zhu, Zhixuan Wang, Jiahao Zhu, and Zhenhua Bai. "Design Optimization of Key Structural Parameters for Tension Measuring Rollers in Temper Mill Units." Metals 15, no. 6 (2025): 593. https://doi.org/10.3390/met15060593.
Full textAbstract:
During the temper rolling process, scratch defects on the lower surface of the steel strip caused by the tension measuring roller are a critical issue that affects the resulting product quality. Previous research has been limited to analyzing the mechanism and influencing factors of scratch generation, and has lacked a systematic design solution for analyzing and addressing scratch defects. This study deeply analyzed the mechanism of scratch formation, and it was determined that the fundamental cause lies in the relative sliding between the steel strip and the tension measuring roller. Specifically, the driving torque of the steel strip on the tension measuring roller is insufficient to overcome its total rotational resistance torque. This study identified the strip wrap angle, roller sleeve outer diameter, and wall thickness as key structural parameters that influence this torque balance. In optimizing the structural parameters of the tension measuring roller, this research had two main goals: eliminating scratch defects and avoiding strip warpage defects. To achieve this, a strip warpage calculation model and a scratch verification model were established. These were combined with structural connection safety verification. Based on these analyses, the optimal structural parameter combination was determined. This combination includes a roller sleeve outer diameter of 500 mm, a roller sleeve wall thickness of 20 mm, and a wrap angle of 30°. The consistent results that were obtained from theoretical analysis, finite element simulation, and actual production trials demonstrate that the optimized structural parameters of the tension measuring roller can effectively prevent relative sliding between the steel strip and the tension measuring roller, completely eliminating scratch defects on the lower surface of the steel strip and significantly improving product quality. This provides a reliable solution for the scratch problem in temper rolling. This solution also reduces scrap rate and production costs. Furthermore, it meets the strict surface quality demands of high-end applications. This leads to improved production efficiency and customer satisfaction. Ultimately, this method enhances product competitiveness and promotes industry technological progress.
13
Trujillo, Ernesto, and Guillermo Martínez. "Operational efficiency of the longline hauler on a prototype artisanal tuna fishing vessel from Margarita Island, Venezuela." Latin American Journal of Aquatic Research 38, no. 3 (2011): 485–92. http://dx.doi.org/10.3856/vol38-issue3-fulltext-12.
Full textAbstract:
The operational efficiency of the longline hauler on an artisanal tuna fishing vessel from Margarita Island, Venezuela, was determined using the average setting velocity, average hauling velocity, hauler input tension (To) and traction strength (P). A direct relationship was found between the average gravity (qmed) on the long-line section and the hauler input tension (To). Considering a strength (Pmed) at the input of the longline hauler (S1), the roller tension (S3) decreases due to the force of H = 23.7 N exerted by the pressure roller, resulting in a strength of S3= 0. The longline average setting velocity was 208 m min-1 (~ 333 hooks/hour) and its hauling velocity was 121 m min-1 (~ 160 hooks/hour), whereas hauler input tension (To) was 1013 N. Therefore, the new traction strength (P) fluctuated between 1.317 and 1.418 N. Based on torque output from the rollers of the longline hauler, the average hauling velocity (vmed) and the transmission relations (k1, k2), a required average strength (Nmed) of 5.3 hp (~ 3.95 kW) for longline retrieval was estimated. Thus, the hauling efficiency (Tp) by longline section was estimated to be 135.4 s.
14
Rice, Brian S., and Roger F. Gans. "Predictive Models of Web-to-Roller Traction." Journal of Tribology 127, no. 1 (2005): 180–89. http://dx.doi.org/10.1115/1.1828066.
Full textAbstract:
We studied the traction developed between a thin, flexible web and a rotating circumferentially grooved cylindrical roller. We have developed a new two-dimensional analytic model that couples air film pressure, web deflection, and asperity contact to predict traction for circumferentially grooved rollers with arbitrary wrap angles. The entrance effects are incorporated into our new traction model by adapting the squeeze film concept using the distance from the entrance as a surrogate for time. We have verified this model experimentally on a series of 14 rollers and 19 webs. We tested both nongrooved and circumferentially grooved rollers. We showed experimentally that rough, ungrooved rollers that have their low areas unconnected produce significantly lower traction and do not fit the model introduced here. Such rollers should be avoided where traction is important. We introduce dimensionless groups that the roller designer can use to quantitatively assess the interactions of process variables (e.g., speed, tension, etc.) with design variables (e.g., groove depth, groove pitch, roughness, etc.) over the full range of practical wrap angles.
15
KAUNG, Pyae, Danila SOLOVYKH, Dmitriy NAGORNIY, and Danila ADIGAMOV. "Modelling of belt conveyor movement considering the inclination angle and tension of the ropes of the load bearing structure." Sustainable Development of Mountain Territories 14, no. 4 (2022): 603–14. http://dx.doi.org/10.21177/1998-4502-2022-14-4-603-614.
Full textAbstract:
Introduction. The relevance of the work is caused by the need to eliminate the arising automatic vibration processes of the pendent roller of the conveyor linear sections relative to roller pendant and minimization of vibration synchronization processes of a significant number of pendent rollers, leading to a conveyor stop. Previous studies have established that the most effective way to transport coarse material in underground mining is a belt conveyor. These studies have identified the disadvantages of conveyor transportation.The most common ones include the auto-vibration of the pendent roller of the conveyor linear sections relative to roller pendant. The manifestation of roller automatic vibrations increases the energy intensity of the process and reduces the performance of the belt conveyor. Objective. To set the angle of the conveyor belt inclination and the tension of the ropes of the load-bearing structure with the lowest amplitude vibrations of the pendent roller in order to reduce the energy intensity of the transportation process during the deposit development and increase the operational performance of the conveyor. Task. Modeling the possibility of manifestation and causes of occurrence, as well as the circumstances of long-term preservation of roller automatic vibrationson conveyors. Materials and methods of research. The object of the study is a conveyor belt with different angles of inclination (transportation).The authors conducted analysis and summary of previously performed own research; comparison with newly obtained experimental results; as well as a generalization of theoretical and experimental studies carried out by scientists in this field; synthesizing literature and patent data. Reliabilityis confirmed with application of actual state standards and approved research methodology. Boundary conditions are accepted: conveying of ordinary medium- and small- sizedmaterials is carried out; there is a constant unit load on the belt during transportation. Two types of connection are considered: the presence of an anchoring branch of roller with the ropes; absence of an anchoring branch that is the hinged connection of roller with the ropes. Research results. It has been established that when the belt moves with a load, the pendent roller deflects along the direction of the belt movement, regardless of the type of anchoring. The angle of the side roller inclination is calculated through the sliding velocity relative to the belt. The characteristics of sliding friction or change in sliding friction coefficient are modeled. The influence of the pendent roller mass on the process of automatic vibrationsat various angles of conveyor inclination has been evaluated. The reason for the occurrence of automatic vibrationsis established. Conclusion. Design changes that prevent side roller misalignment are recommended to reduce the likelihood of automatic vibrations.The side roller misalignment angle interval, beyond which stable conveyor operation is achieved, is determined. Resume. The results of the research can be useful in designing the conveyor when transporting the extracted raw materials.
16
Gao, Chang Yin, and Wan Quan Li. "Design of the Pinch Machine for Battery Grid Continuous Casting Machine Based on Link and Floating Gear Mechanism." Key Engineering Materials 474-476 (April 2011): 2258–62. http://dx.doi.org/10.4028/www.scientific.net/kem.474-476.2258.
Full textAbstract:
In order to realize pinch during the production of the continuous casting battery grid, using the link and floating mechanism a pinch machine is designed which can automatically adjust the roll gap and pinch tension. First the structure of the grid pinch machine is introduced ,in which adopts the dual drive roller to achieve the upper and lower pinch roll and pinch roll to rotate in accordance with the same speed, but in the opposite direction. The pinch force generates by the fiction force between the grid plate and the upper and lower pinch roller. By means of the shifting bearing and spring the position of the upper pinch roller is controlled and the roll gap adjustment mechanism adopts the link and floating gear mechanism which results in structure simplification , high reliability, Low cost, stable, long life and low noise. Finally, according to the design principle of the pinch machine, using the theoretical mechanics and the Euler formula the pinch roller tension, tension roller tension and pinch pressure are calculated. The pinch machine has made it possible to achieve the manufacturing system of continuous casting battery grid.
17
Khamza Farzaliyev, Mazakhir, and Laman Yashar Alirzayeva. "FORMULATION AND SOLUTION OF THE DEFLECTION AND SECTION ROTATION EQUATION FOR THE WARP BEAM ON WEAVING LOOMS." Elmi Əsərlər 34, no. 1 (2025): 73–80. https://doi.org/10.61413/yaux1608.
Full textAbstract:
The commodity roller is one of the key components of a weaving loom, ensuring uniform fabric tension during the winding process. Its proper functioning affects the quality of the product, the stability of the loom's operation, and the efficiency of the production process. With increasing demands for precision, reliability, and durability in textile industry equipment, there is a growing need for a detailed analysis of the mechanical behavior of rollers, including their deflection, rotation, and deformation. The development of mathematical models enables improvements in equipment performance, reduces the risk of failures, and extends the lifespan of components. This research is relevant for enhancing the competitiveness of modern weaving technologies and meeting the demand for high-quality textile products. This study investigates the process of winding fabric onto the commodity roller of weaving looms, with a focus on the formulation and solution of deflection and section rotation equations for the warp beam. The mechanical interactions between fabric tension, roller geometry, and beam deformation are analyzed. To determine the deflection and rotation angle of the beam, a calculation model is developed. The findings of the research contribute to enhancing the efficiency, durability, and performance of weaving looms by improving the design.
18
Blinov, D. S., D. I. Tsvetkov, and M. I. Morozov. "ANALYSIS OF THE EFFECT OF RINGS STIFFNESS AND THEIR POSITION ALONG THE ROLLER AXIS ON THE UNEVEN LOAD DISTRIBUTION IN A NUT-FREE ROLLER DRIVE." Spravochnik. Inzhenernyi zhurnal, no. 323 (February 2024): 8–19. http://dx.doi.org/10.14489/hb.2024.02.pp.008-019.
Full textAbstract:
The objects of study are promising nut-free roller drives (RD), which have high performance characteristics and were developed as part of the import substitution program. This paper is a continuation of a previously published article, which considers the peculiarity of loading the roller of a nut-free RD with axial forces that create an overturning moment. Its balancing leads to uneven distribution of the load between the running turns of the roller and uneven loading of the rings. The coefficient of uneven distribution of the load between the working turns of the roller Кн is introduced, the value of which depends on a number of design parameters of the details of the nut-free RD and the value of the working load. To reduce the coefficient Кн of uneven load distribution, in this paper and in a previously published article, the results of studies are presented that allow developing recommendations for choosing rational values of transmission design parameters. It has been established that the value of the coefficient Кн is influenced by the rigidity of the cross-section of the rings that keep the rollers from moving in the radial direction. Under load from the rollers, the rings stretch and bend, have a radial deflection. If the number of rollers in the transmission is seven or more, then the specified deflection of the ring from tension is ten or more times greater than the deflection from bending, that is, to reduce the coefficient Кн, it is advisable to increase the cross-sectional area of the ring. The position of the rings along the roller axis has a significant effect on the value of the coefficient of load unevenness Кн. With an increase in the distance between the center of gravity of the roller and rings, the value of the specified coefficient decreases. Taking into account the performed studies, a design technique for nut-free RD with rational parameters necessary to reduce the coefficient of uneven load distribution Кн between the working roller turns has been developed. In this technique, nut-free RDs with different roller designs are considered: rollers with necks at the ends and rollers with necks between their threaded sections.
19
Ducotey, K. S., and J. K. Good. "The Effect of Web Permeability and Side Leakage on the Air Film Height Between a Roller and Web." Journal of Tribology 120, no. 3 (1998): 559–65. http://dx.doi.org/10.1115/1.2834587.
Full textAbstract:
Air entrained between a web and roller can cause a loss in traction that can affect web quality. The entrained air causes an air layer to form which separates the web from the roller. Insufficient traction exists at this point and an idler roller will be unable to be driven by the web. Other applications, however, such as newsprint moving around a turnbar, require complete clearance. An equation for predicting the air film height between a permeable web and roller was developed using foil bearing theory. The separation distance (h) between the roller and web is a function of the roller radius (R), web tension (T), air viscosity (η), summation of the web and roller velocities (U), and the web permeability (α). The air film height was found to decrease linearly around the circumference (θ) of the roller in the constant pressure region. Therefore, the air film height can be expressed simply as, h=0.643R[(6ηU)/T]2/3−2[(αT)/U]θ The slope of the air film height is a function of the web/roller velocity, web tension, and the permeability of the paper. A correction factor for side leakage was also incorporated into the result.
20
Yun, Heedo D., Ralf R. Peek, Paul R. Paslay, and Frans F. Kopp. "Loading History Effects for Deep-Water S-Lay of Pipelines." Journal of Offshore Mechanics and Arctic Engineering 126, no. 2 (2004): 156–63. http://dx.doi.org/10.1115/1.1710871.
Full textAbstract:
For economic reasons S-Lay is often preferred to J-Lay. However in very deep water S-Lay requires a high curvature of the stinger to achieve the required close-to-vertical departure angle (or a large, low curvature stinger). Choosing the high curvature stinger can lead to plastic deformations of the pipe. The high top tension increases the plastic deformations in two ways: firstly it adds an overall tensile component to the strains, thereby increasing the strains at the 12 o’clock position. Secondly, it increases the strain concentrations, which arise due to discontinuous support of the pipe on the stinger. Typically, the pipe is guided over a series of roller beds. The high top tension tends to straighten the spans between the rollerbeds. To accommodate this (so that the pipe can still follow the stinger), higher curvatures occur at the roller beds. Analytical and numerical solutions are provided to quantify this effect. The analytical solution is fully developed for an arbitrary pipe material models, provided that: (i) the moment-curvature relation for the pipe under tension is known, and (ii) no cyclic plastic ratchetting occurs due to repeated bending of the pipe over the roller beds and straightening in the spans between roller beds. Agreement between the analytical and numerical (finite element) results is excellent. Proper loading history must be used in the numerical simulation, otherwise the level of strain concentration can be overpredicted.
21
Razdobrieiev, V. H., K. Yu Kluychnikov, D. G. Palamar, O. I. Leshchenko, and O. P. Ivanov. "Analytical studies of the influence of the technological parameters of the process of pulling the strip through the bending-stretching device on the change of the energy-force parameters of the process." Fundamental and applied problems of ferrous metallurgy, no. 38 (2024): 455–68. https://doi.org/10.52150/2522-9117-2024-38-455-468.
Full textAbstract:
It is impossible to imagine the modern development of technology without the use of metal products, including wire products, which are subject to high requirements in terms of variety and quality, and to the production processes, for example, wire of a fashioned profile, the flexibility of technology, high efficiency and economy, labor safety and automation. One of them is the process of drawing metal in roller dies, which combines the features of two methods of pressure metal processing - rolling and drawing. The main working tool when applying the drawing process in roller dies is a roller die with non-driven working rollers. The main drawback of the roller dies method is the presence of traction force. Stretching stresses in combination with a decrease in the plasticity of the metal during the drawing process can lead to the destruction of the rolled product. This limits the assortment of profiles, the total crimping in one of transition. It is possible to increase the plasticity of metal in two ways - thermal and mechanical. The thermal method, which is widely used in industry, requires significant energy consumption. At the same time, previous studies, which were carried out including in the ISI NASU, showed that it is possible to increase the plasticity of the metal by means of alternating sign deformation of the profiles, using, for example, equipment for straightening profiles or a scale breaker. The purpose of analytical research is to establish the dependence of the influence of the technological parameters of the drawing process in a roller drawing machine combined with the pulling of strips through a device for bending with tension (DBT) on the change of the energy parameters of the process based on the developed mathematical model. Analytical studies of the influence of the technological parameters of the DBT were carried out for the case of deformation of the initial workpiece of round cross-section with a diameter of 5.90 mm from low-carbon steel of the St.08 brand in a double-roll roller die with smooth rolls, combined with DBT in the conditions of the laboratory base of the pressure metal processing department of the Iron and Steel Institute of the Z. I. Nekrasov of NASU. On the basis of the revealed regularities, the dependences of the energy-force parameters of the process of drawing in a roller die, combined with the drawing of strip through the DBT, on the influence of the main technological parameters were obtained. It was established that an increase in the distance between of the axes rollers of the DBT at a constant value of the movement of the axis of the pressure roller of the DBT in the vertical direction leads to a decrease in the angle of coverage of the roller by the strip. It has been established that at a constant distance between the axes of the DBT rollers, when the amount of movement of the axis of the DBT pressure roller increases vertically, on the contrary, the values of the angle of coverage of the roller by the strip increase. It is shown that an increase in the number the rollers of DBR leads to an increase in both the pulling force of the strip and the normal component of the force acting on the trunnion of the rollers of the DBT. It was determined that the most significant influence of the height of the stretched strip and the radius the rollers of the DBT on the pulling force occurs in the range of relations R/h≤10. It was established that an increase in the total degree of preliminary deformation in the roller die and sign-changing deformation in the DBT of the strip leads to an increase in the value of the pulling force.
22
BURAEVA, G. M., A. V. SHISTEEV, and M. K. BURAEV. "PROCESSING THE HOLE OF THE SUPPORT ROLLER FOR TRACTOR SUSPENSION SYSTEM BY STITCHING." Tekhnicheskiy servis mashin 62, no. 3 (2024): 91–96. http://dx.doi.org/10.22314/2618-8287-2024-62-3-91-96.
Full textAbstract:
Restoring the surface of the roller treadmill to its nominal value using automatic surfacing technology makes it possible to obtain a significant surfacing layer with a sufficient degree of strength and wear resistance. At the same time, as a result of thermal action, the metal of the roller receives a linear shrinkage, due to which the diameter of the hole for the bearing of the roller axis decreases. In this case, it becomes impossible to install the outer bearing cage. (Research purpose) The research purpose is substantiating the method of processing the seat under the outer bearing cage after surfacing the treadmills of the support roller. (Materials and methods) It was noted that the surfaces of the treadmills of the support rollers wear out quickly as a result of abrasive friction with the track link and the soil. It was clarified that when surfacing in all ways, metal shrinkage occurs and the diameter of the hole for the outer bearing cage decreases. (Results and discussion) It was found that the wear of the treadmills of the support rollers averaged 13.9 millimeters. Restoration of the treadmill surface of the roller to the nominal value, carried out by the method of multilayer automatic surfacing, caused a decrease in the diameter of the roller opening by an average of 0.73 millimeters. We chose from the considered options for calibrating the hole the most preferable from and time-saving one, the firmware processing method. (Conclusions) The appearance of shrinkage of the support roller hole during restoration by automatic surfacing and the method of calibrating the hole using firmware were substantiated. The method provides tension in the coupling of the outer ring of the bearing with the roller within 0.015-0.039 millimeters and surface cleanliness within Ra 1.25-0.63 micrometers. The firmware is simple in design and can be manufactured in a repair shop.
23
Deng, Bo, Yaoyao Shi, Tao Yu, and Pan Zhao. "Influence Mechanism and Optimization Analysis of Technological Parameters for the Composite Prepreg Tape Winding Process." Polymers 12, no. 8 (2020): 1843. http://dx.doi.org/10.3390/polym12081843.
Full textAbstract:
Composite prepreg tape winding technology has proven to be an effective method for manufacturing revolving body composite structures in aerospace field. Process parameters including heating temperature, tape tension and roller pressure have an important impact on the winding products’ mechanical property such as tensile strength. The aim of this study is to investigate the influence mechanism and optimization analysis of parameters for the composite prepreg tape winding process. Firstly, the sensitivity analysis for single parameter had be employed to reveal the influence mechanism of each winding parameter change on tensile strength. Secondly, iso-surfaces analysis for parameter range had be applied to describe the distribution law of parameter with continuous distribution characteristics. Then the coupling analysis for process parameters was carried out employing response surface methodology. The analysis results showed that tape tension has the most significant effect on the winding products’ tensile strength. And the outstanding parameter combination with the heating temperature of 72 °C, tape tension of 307 N and roller pressure of 1263 N was provided by response surface design software via desirability function method. The validation experiments showed that the optimal parameter combination has a positive guiding significance for improving the quality of winding products.
24
Razdobreev, V. G., I. Yu Prykhodko, K. Yu Kluychnikov, D. G. Palamar, and A. I. Leshchenko. "Choice of the method of determining the energy-force parameters of the process of drawn of the stack through a bending-tensioning device." Fundamental and applied problems of ferrous metallurgy 37 (2023): 358–73. http://dx.doi.org/10.52150/2522-9117-2023-37-358-373.
Full textAbstract:
In the practice of manufacturing metal products, shaped profiles of a complex configuration, including thin-walled, strip and periodic cross-section profiles, play a special role. High-quality, high-precision shaped profiles with different ratio of the width to the height of the tape, which are produced in small-tonnage batches abroad and are widely used in machine-building, instrument-building, aircraft-building and other industries. In Ukraine, the production of high-precision shaped profiles is extremely limited, and the production of strip-type profiles is completely absent. Tape-type shaped profiles are usually produced by cold deformation on drawing, flattening or sheet-rolling mills. The use of drawing in roller drawing in comparison with cold rolling and flattening has higher technological flexibility, does not require large capital costs for the organization of production. Compared to traditional drawing with the use of monolithic drags, the drawing process in roller drags has the following advantages: lower energy consumption; higher permissible deformation per pass; higher homogeneity of product properties, expensive drawing lubricants are not used, additional special metal preparation operations for drawing are not carried out (phosphating, oxalate, copper plating, brown coating, etc.). The main drawback of the roller drag method is the presence of traction force. Tensions that stretch the profile in combination with a decrease in plasticity of the metal during the drawing process can lead to the destruction of the rolled product. In order to eliminate the harmful effects of residual tensile stresses, it is necessary to either eliminate them or convert them into compressive stresses that increase the workability of the steel billet. For this purpose, two methods are used in the practice of wire production: thermal and mechanical. The thermal method used in industry requires significant energy consumption. The mechanical method has several varieties, of which the most rational is the process of sign-changing deformation with wire stretching in a bending-stretching device. The process of cold deformation with the use of a bending-stretching device is carried out with a counter-tension, the value of which is equal to the effort of drawing the workpiece through this device. The counter-tension determines the force of cold deformation and the power of the drive motor of the traction device, the value of the maximum possible deformation during the first pass, the stability of the cold deformation process and other parameters. When working with a large back tension, frequent breaks in the rolling stock are possible. Therefore, it is very important to correctly calculate the force of cold deformation using bending and stretching roller devices. The purpose of the work: on the basis of the performed analysis, to choose a technique for determining the energy parameters of the process of drawing the staffs through the bending and stretching device. As a result of the analysis, the method of calculating the force parameters of the process and the change in shape of the wire rod in the bending-stretching roller device with comprehensive consideration of the mutual dependence of the degree of deformation, the tensile strength of the metal, and the changes in mechanical properties during the deformation process was determined. The headquarters in the roller bending-tension device adopted the methodology that was developed earlier in the ISI of the National Academy of Sciences of Ukraine. The chosen methods serve in the future for the development of a mathematical model for calculating energy parameters and shape change parameters of the process of stretching the staffs through the bending-stretching device, which will allow for a reasonable choice of the parameters of the sign-changing bending of the staffs.
25
CHENG, Hui, and Shigeo YANABE. "Effects of Tension Roller on Belt Skew." TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C 67, no. 664 (2001): 3715–21. http://dx.doi.org/10.1299/kikaic.67.3715.
Full text
26
Metlikovič, Peter, and Eberhard A. Meinecke. "Stresses, Slip and Abrasion of Rubber Covered Conveyor Rollers." Rubber Chemistry and Technology 72, no. 3 (1999): 484–512. http://dx.doi.org/10.5254/1.3538815.
Full textAbstract:
Abstract Conveyors consist of rubber coated, fiber reinforced belts which are supported and driven by rollers. The rollers are generally coated to increase and stabilize the friction and to reduce abrasion, noise and dirt buildup. Pressures and shear stresses in the rubber layer depend on belt tension, driving forces, geometry and material properties of belt and roller. Most rollers fail due to abrasion when the shear stresses are higher than the friction forces. Slip due to pressure between the belt and the rubber layer is proportional to pressure. Additional slip arises from troughing transitions, uneven belts and rollers and from driving forces. Abrasion due to slip is proportional to the pressure of the belt to the power 1.5 to 3. Equations to predict stresses, slip and abrasion are presented. To reduce abrasion rates, conveyors should have large diameter rollers, low belt tension and a wide belt. Also, cylindrically machined pulleys, high quality belts and long troughing transitions should be employed.
27
Molnár, Vieroslav, and Martin Sabovčík. "Static testing evaluation of pipe conveyor belt for different tensioning forces." Open Engineering 9, no. 1 (2019): 580–85. http://dx.doi.org/10.1515/eng-2019-0069.
Full textAbstract:
AbstractThe paper analyzes static tests of pipe conveyors using various statistical indicators and points out the mutual interactions between individual roller stands. Individual measurements were performed on a physical model of a pipe conveyor, while the methodology and procedure were verified by experiments. 15 repetitions of the given series of measurements were selected, which was a compromise between time demands and statistical requirement. Normal contact forces on the individual rollers of three hexagonal roller stands acting on the conveyor belt for different tension forces in the static state (conveyor belt without movement and without transported material) were evaluated. The LabVIEW Signal Express 2010 program from the National Instruments Company was used to record the measured data. The measurements were evaluated by Microsoft Office Excel.
28
Xie, Lin Li, and Jing Hui. "Research on Automatic Exchanging Technology of Unwinding Rollers in Processing on Compounded Film." Applied Mechanics and Materials 321-324 (June 2013): 1627–32. http://dx.doi.org/10.4028/www.scientific.net/amm.321-324.1627.
Full textAbstract:
In compounded film process, as the way of exchanging rollers manually in the end of unwinding rollers will lead to a decline in production efficiency, a multi-motor wheeled automatic roller exchanging system is proposed. The system drives four servo motors by Programmable Multiple-Axis Controller (PMAC) simultaneously, makes two servo motors which drive cross shaft and cutter shaft under high precision position control mode, makes the other two servo motors which drive unwinding rollers under speed control mode, detects the position of dancer roll to keep tension constant. Compared with the way of exchanging rollers manually, the new way can exchange rollers effectively with no downtime, improve the production efficiency and the rate of finished products.
29
Zhang, Ming Song, Yi Zhang, Jian Jun Ke, Xiao Wei Li, and Lian Bing Cheng. "The Influence of Tangential Roller Pressure on the Stability of Circular Saw Blade." Applied Mechanics and Materials 614 (September 2014): 32–35. http://dx.doi.org/10.4028/www.scientific.net/amm.614.32.
Full textAbstract:
The finite element method was used to study tangential roller method impact on the stability of circular saw blade. Using 30 ° cyclic symmetric model is analyzed. The results show that the tension of the saw blade is not the same, and tensioning effect is different, when the tangential roller pressure is not same. At the same time, after tangential roller, the face run out of saw blade is small, which show that the smoothness of tangential roller is better.
30
Conwell, James C., and G. E. Johnson. "Experimental investigation of link tension and roller-sprocket impact in roller chain drives." Mechanism and Machine Theory 31, no. 4 (1996): 533–44. http://dx.doi.org/10.1016/0094-114x(95)00070-f.
Full text
31
Danilin, Oleksandr, Stefan Zaichenko, Stepan Shevchuk, Natalia Jukova, and Ivan Pasichniuk. "DETERMINATION OF THE CHANGE OF THE DESIGN POSITION OF THE PROFILE OF THE BELT CONVEYOR ON THE LOAD OF THE ROLLER BEARINGS." Geoengineering, no. 3 (December 14, 2020): 20–25. http://dx.doi.org/10.20535/2707-2096.3.2020.219324.
Full textAbstract:
The article attempts to establish the basic patterns in the formation of loads in the structure of the conveyor frame due to changes in the design position of the constituent elements based on analytical calculations. The amortization replacement of rollers and the establishment of a change in the projected resource caused the change in the design position.The aim of the work is to study the interaction of the elements of the belt conveyor on the convex region of the profile when the design position changes and to determine the change in the resource of the roller support elements. The purpose of the work is formulated from the analysis of unplanned stops and premature replacement of conveyor elements, in particular conveyor rollers, on the convex region of the profile.To achieve this goal the influence of the geometric parameters of the convex section of the belt conveyor profile on the force interaction of the belt and roller supports was considered, and the change in the resource of the roller bearings was determined.To characterize the geometric parameters of the convex section of the belt conveyor, the following were selected: the number of roller supports, the distance between the roller supports, the radius of curvature of the conveyor profile, the angle of the curved section. The mathematical model is based on the belt equilibrium equation, which contains the tension forces of the conveyor belt and the forces from the action of roller supports. Particular attention is paid to establishing the effect of changing the geometric parameters of the convex section on the roller bearing life. It has been established that a decrease in the radius of the transitional convex section as a result of a change in the initial design position by 2.4 times leads to an increase in the force acting on the roller support by 161%. It was found that the increase in force is the reason for the rapid exit from the operational state of the rolling bearings of the roller bearings, as evidenced by the intensive drop in the resource of the rollers (18 times).The proposed algorithm for determining the main parameters of the force interaction of the elements of the belt conveyor on the convex region of the profile will make it possible to predict the resource and prevent the conveyor from leaving the premature operational state.
32
Wang, Hui, Min Hui Tong, and Pei Zheng. "Research on Contact Strength between Roller Screw Pair on Hoisting Mechanism Applied in Deep Sea Crane." Applied Mechanics and Materials 423-426 (September 2013): 2001–5. http://dx.doi.org/10.4028/www.scientific.net/amm.423-426.2001.
Full textAbstract:
Roller screw pair is the major part of the rope guiding device that used in deep-sea hoisting mechanism. This paper focuses on the contact problems of the roller screw pair. The hoisting mechanism used in the deep sea engineering has the rope with large diameter, sustaining the great rope tension force. So its important to research the contact stress of the roller screw, This paper study the impact of surface hardness of the roller on the performance of the roller screw, sums up the effect of hardness on the bearing capacity of the roller, and provides the theoretical support and references for the designing and application of this new type of roller screw in marine engineering.
33
Liu, Xin Jin, Xu Zhong Su, and Ting Ting Wu. "Quasistatic Model for the Symmetrical Ring Spinning Triangle." Advanced Materials Research 331 (September 2011): 498–501. http://dx.doi.org/10.4028/www.scientific.net/amr.331.498.
Full textAbstract:
In this paper, theoretical model of the distribution of fiber tension in the symmetrical spinning triangle was given firstly. Then, based on the force balance of the twisting point, the quasistatic model for the symmetrical ring spinning triangle was present. It is shown that the convergence point can be determined with ease for different spinning tension, torsion moment, the numbers of fibers at the roller nip, the fiber tensile Young’s modulus and cross-section, and the width of the spinning triangle.
34
Ciematnieks, Uģis, and Evita Tomanoviča. "EFFECT OF FOAM ROLLER AND STATIC STRETCHING ON BIOMECHANICAL PARAMETERS OF MUSCLE." SOCIETY. INTEGRATION. EDUCATION. Proceedings of the International Scientific Conference 6 (May 20, 2020): 150. http://dx.doi.org/10.17770/sie2020vol6.5082.
Full textAbstract:
After training, it is needed to perform flexibility exercises for muscle stretching, but many choose to use the foam roller. With a foam roller, you can both exercise and perform a myofascial release that affects the deep tissues of extremities. Myofascial release improves blood circulation in muscle, develops elasticity, flexibility and minimizes the risk of an unwanted injury (Myers & Frederick, 2012). Many studies are being carried out to determine the effects of the various types of stretching on balance, speed and reaction (Apostolopoulos, Metisos, Flouris & Koutedakis, 2015). Training programs are designed so that after applying different workloads at the end there is cool-down through stretching exercises, but these training plans rarely recommends foam rollers as stretching means, even though they are popular every day. Aim of study: Find out the most effective method for reducing muscle tension in lower extremities. The study identifies changes in the biomechanical parameters of the hamstring muscle group after general stretching exercises and foam roller, after GRIP fitness concept class, using the Myoton PRO biomechanical parameters measurement. The study do not show any significant differences that may be in favour of one or the other method. Literature sources indicate that foam rollers exercises helps to relieve and restore the strained muscles more quickly, increases flexibility (Barrett, 2017). Our study did not confirm any of such findings. Foam roller exercises for myophascial release is as effective as static stretching exercises.
35
Li, Qingbin, Fude Zhang, Wencui Zhang, and Lichen Yang. "Fracture and Tension Properties of Roller Compacted Concrete Cores in Uniaxial Tension." Journal of Materials in Civil Engineering 14, no. 5 (2002): 366–73. http://dx.doi.org/10.1061/(asce)0899-1561(2002)14:5(366).
Full text
36
Kaczor, Jarosław. "EFFECT OF TAPERED ROLLER BEARINGS PRELOAD ON BEARING SYSTEM DURABILITY." Tribologia 298, no. 4 (2022): 15–26. http://dx.doi.org/10.5604/01.3001.0015.8365.
Full textAbstract:
Tapered roller bearings are usually used in situations in which high bearing stiffness is required. However, a significant increase in stiffness can only be achieved by introducing initial tension (mounting clamp) to the angular contact bearings arrangement. Just like in case of angular contact ball bearings and tapered roller bearings, the preload is an axial displacement of one bearing relative to the other, measured from the neutral state and causing an increase in the internal forces in the bearings. Positive preload causes contact pressures of the rolling parts to appear even when no external force acts. The purpose of this work is to present the influence of the initial tension of a tapered roller bearings system on life of these bearings.
37
Zhou, Cong Ling. "Effect of Pre-Strain and Roller Working on Torsional Fatigue Properties of a Structural Steel." Advanced Materials Research 295-297 (July 2011): 2227–30. http://dx.doi.org/10.4028/www.scientific.net/amr.295-297.2227.
Full textAbstract:
In this study, fatigue tests have been performed using two kinds of specimens made of 25 steel. One is pre-strained specimen with pre-strain ratio changing from 2% to 8% by tension, the other is roller worked with deformation of 0.5 mm and 1.0 mm in diameter direction. In the case of pre-strained specimen, the fatigue limit increases according to increase of tensile pre-strain, the fatigue limit of 8% pre-strained specimen is 25% higher than that of non-pre-strained one; in the case of roller worked specimen, the fatigue limit of R05 and R10 is 126% and 143% to that of non-roller worked specimen, respectively. These remarkable improvements of fatigue limit would be caused by the existence of compressive residual stress, work-hardening and the elongated microscopic structures.
38
Wang, Qing, Anqing Li, Yuanyuan Li, Jixin Liu, Hui Shen, and Guoyong Li. "Microtension control for a yarn winding system with an IMC PID controller." Mechanics & Industry 20, no. 6 (2019): 609. http://dx.doi.org/10.1051/meca/2019042.
Full textAbstract:
In this paper, feedforward compensation and an internal model control (IMC) PID tuning method to maintain the yarn tension within a micro-boundary range are proposed. The proposed method can be used to improve the quality of products in textile industry. We first develop a mathematical model of the AC servo motor and yarn tension system. Based on the results of the mathematical model, an IMC PID controller is designed to control the microtension of the yarn. The proposed IMC-PID controller can be directly calculated from the time constant and time delay. Feedforward control is used to compensate for the linear velocity of the winding roller. To reduce the lateral vibrations of the yarn, we designed an active roller to nip the moving yarn. The active roller compensates for the variation in the diameter of the unwinding roller. The proposed method effectively improves the dynamics performance and the robustness of the system, and is appropriate for industrial application. Experimental instruments, including a tension sensor, an AC servo motor and a motion controller, equipped with a computer, are used to test the proposed method. The simulation and experimental results show the effectiveness of the proposed controller for the yarn microtension control system.
39
Liu, Yan, and Yan Peng. "The Simulation Analysis of Tension Leveling for Improving the Shape Defects of Strip." Advanced Materials Research 634-638 (January 2013): 2818–23. http://dx.doi.org/10.4028/www.scientific.net/amr.634-638.2818.
Full textAbstract:
According to the computation model of the stress, the strain, and the extend ratio in tension leveling, under the platform of mat lab, take the linear strengthening ball plastic model as the foundation, established the simulated program of the quantitative parameters enactment of tension leveling craft, this procedure consideration initial remaining stress of strip, namely random shape defects, assign tensile stress and the curving curvature, compute the strip’s stress and strain change and elongation ratio after tension leveling, given the stress and strain and the extension rate of the main process parameters from the simulation results of each roller, analysis of different process parameters set on impact of the simulation results, and the results conform to reality tension leveling production.
40
Balovnev, N. P., Y. I. Brovkina, and L. A. Dmitrieva. "V-belt transmissions of agricultural machines." Traktory i sel'hozmashiny 1, no. 3 (2021): 31–36. http://dx.doi.org/10.31992/0321-4443-2021-3-31-36.
Full textAbstract:
The article is devoted to the analysis of design features and operating conditions of V-belt trans-missions of agricultural machinery. When designing these gears, it is recommended to give prefer-ence to gears made according to an open circuit or with a tension roller located outside the belt con-tour, to avoid cross and semi-cross gears, as well as multi-pulley gears with crossing shaft axles. To make the wider use of more progressive types of belts. It was shown that the features of V-belt transmissions of agricultural machinery require clarification of the methods for calculating trans-missions with progressive types of V-belts and automatic belt tensioning methods. It was noted that special attention should be paid to transmissions with multi-profile belts, which calculation has not been sufficiently reflected in domestic regulatory documents. The advantages of such belts are es-pecially noticeable under variable and shock loading. Based on the analysis, the recommendations for clarifying the calculation of belt drives with multi-profile belts were given. Analytical dependencies are proposed for determining the value of the nominal power transmitted by one belt (stream) of a multi-profile belt, allowing automation of the calculation of V-belt transmissions of agricultural machinery. For gears with a tension or guide roller that add an extra (sometimes reverse) bend of the belt, it is proposed to determine the coeffi-cient taking into account different degrees of bending on the pulleys according to a graph built tak-ing into account the linear hypothesis of summation of damages. It is recommended to calculate gears with spring-loaded tensioning rollers and design tensioning devices for such transmissions using a special method that takes into account the belt tensioning method. At the same time, the required value of the pre-tension of the belt can be significantly re-duced, which will have a positive effect on its resource, without losing the traction capacity of the transmission itself. Expressions are given for finding the value of the pre-tension of belts, both for gears with tension due to the elasticity of the belt, and for gears with spring-loaded tension rollers. Conclusions and directions for further research are formulated.
41
Kim, Jaeyoung, Kyungrok Kim, Hyunchang Kim, et al. "Experimental Validation of High Precision Web Handling for a Two-Actuator-Based Roll-to-Roll System." Sensors 22, no. 8 (2022): 2917. http://dx.doi.org/10.3390/s22082917.
Full textAbstract:
In this paper, experimental validation of high precision web handling for a two-actuator-based roll-to-roll (R2R) system is presented. To achieve this, the tension control loop is utilized to regulate the tension in the unwinder module, and the velocity loop is utilized to regulate the web speed in the rewinder module owing to the limitation of the number of actuators. Moreover, the radius estimation algorithm is applied to achieve an accurate web speed and the control sequence of the web handling in the longitudinal axis is developed to manipulate the web handling for convenience. Having these, the tension control performances are validated within ±0.79, ±1.32 and ±1.58 percent tension tracking error and 1.6, 1.53 and 1.33 percent web speed error at the speeds of 0.1 m/s, 0.2 m/s, and 0.3 m/s, respectively. The tension control performance is verified within ±0.3 N tracking error in the changes of the reference tension profile at 0.1 m/s web speed. Lastly, the air floating roller is used to minimize the friction terms and the inertia of the idle roller in the tension zone so that tension control performance can be better achieved during web transportation.
42
Hossain, M., M. Sparing, T. Espenhahn, et al. "In situ measurement of the dynamic yarn path in a turbo ring spinning process based on the superconducting magnetic bearing twisting system." Textile Research Journal 90, no. 7-8 (2019): 951–68. http://dx.doi.org/10.1177/0040517519879899.
Full textAbstract:
The yarn tension and balloon form are the most important physical process parameters to characterize the dynamic yarn path in ring spinning. The present research work focuses on the in situ measurement of yarn tension in different regions of the yarn path in a developed turbo ring spinning tester with a friction-free superconducting magnetic bearing (SMB) twisting system and at an angular spindle speed of up to 50,000 rpm. The influence of different parameters, such as angular spindle speeds (15,000–50,000 rpm), yarn counts (15–40 tex) and balloon control ring (one or multiple), were evaluated to identify the influence of acting forces, for example, centrifugal forces. The effects of these process parameters were analyzed statistically using an analysis of variance. The yarn tension between the delivery rollers and the yarn guide was measured using a modified one-roller tensile yarn tension sensor. The yarn tension between the yarn guide and the SMB system was determined with an already existing optical approach at a higher angular spindle speed. As the highest yarn tension theoretically occurs between the SMB system and the cop, it was estimated in this region by measuring the coefficient of friction between the yarn and the yarn guide using the friction module of the constant tension tester equipment. The maximum balloon diameter was determined from the recorded balloon form between the yarn guide and the SMB system with respect to different angular spindle speeds. The results provide valuable information about the highest possible spinnable speed and enable a better understanding of the dynamic yarn path in the SMB spinning system.
43
Yoon, J. S., J. H. Choi, T. Suzuki, and J. H. Choi. "Numerical and experimental analysis for the skew phenomena on the flexible belt and roller contact systems." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 226, no. 5 (2011): 1365–81. http://dx.doi.org/10.1177/0954406211420610.
Full textAbstract:
The thin, flexible, flat belt system is frequently employed for power transmission, conveyor systems, and various manufacturing process equipments, such as printers, elevators, and automated teller machines. In general, some critical problems can happen during operation, since a thin flexible belt on rollers can easily skew. This is especially serious for high-speed belt operations. In this skewed situation, due to possible relative roller misalignment, roller deflection, and/or belt non-uniformity itself, a thin flexible belt can move along the perpendicular direction to the travelling direction. In this investigation, an efficient analysis method for simulating skewing phenomena of thin flexible belt systems is presented using the complete integration of large deformable finite element methods and multibody dynamics. A 4-node shell element is used to describe a thin flexible belt and two rigid cylindrical bodies describe the roller. Each cylindrical body is fixed with a pin joint and the positions of the rollers are adjusted to impose a tension to thebelt. For the interactions between the belt and the rollers, an efficient contact search algorithm based on a compliant contact force model is presented in this study. The contact search algorithm is composed of a pre-search and a detailed search to identify points of contact between the belt and the rollers. In the pre-search, a simple algorithm is used to identify lines on the belt that are close enough to the rollers that there might potentially be contact between them. The detailed search is performed by making efficient two-dimensional (2D) comparisons of the cross-section of the roller with a 2D projection of the belt lines identified in the pre-search. Afterwards, the contact force is generated by a compliant force model that uses a stick–slip frictional algorithm. The simulation model is validated against experimental measurement systems for thin flexible belt and rollers. It shows a good agreement with the numerical results. Furthermore CPU time with commercial software ANSYS Workbench is compared to check the performance of the algorithm. The proposed method is more than 10 times faster compared with ANSYS Workbench.
44
Yoshida, Kazushi, Anjyu Suetomi,, Hayato Kawamata, and Yu Nakamichi. "Automatic alignment of elastic slender belt caused by crown roller in two-roller belt system." International Robotics & Automation Journal 10, no. 3 (2024): 78–83. http://dx.doi.org/10.15406/iratj.2024.10.00287.
Full textAbstract:
To clarify the relationship between the geometry of the crown roller and the automatic alignment of the belt in a two-roller belt system that includes a crown roller, we develop an analytical method that calculates the lateral belt position. The calculated results based on this method are in good agreement with the experimental results, thereby validating the analysis method developed. The automatic alignment of the belt is caused by the difference in the peripheral speed of the crown roller in the axial direction. The automatic alignment effect improves as the radius of curvature and the diameter of the crown roller decrease. Furthermore, we show that the effect of belt tension on the automatic alignment of the belt has a slight effect on the time until the belt moves to the roller center position but does not have a significant effect on the automatic alignment of the belt.
45
Kroulík, M., J. Mašek, Z. Kvíz, B. Jošt, and V. Prošek. "Sensors connection for yield determination on round balers with variable chamber." Research in Agricultural Engineering 57, No. 2 (2011): 51–55. http://dx.doi.org/10.17221/24/2010-rae.
Full textAbstract:
The main aim of this article is to present a technical solution for straw and forage yield mapping when using round balers with variable chamber for harvest. The yield measurement is based on monitoring of instantaneous position of a tension roller mechanism for press chamber circular belt. Wheat straw was harvested &ndash; baled, during our trial measurements. The acreage of the trial field was 12 ha. Calibration of the measuring system showed a strong dependence of the tension roller position on the amount of pressed straw (R<sup>2</sup> = 0.99). Geostatistical evaluation confirms a spatial relationship of measured data sets with a moderate spatial dependence. Finally, yield map of straw was created
46
Shoumarova, M., T. Abdillaev, and Sh A. Yusupov. "POSSIBILITY TO ENSURE THE TECHNICAL EFFICIENCY OF THE VERTICAL SPINDLE COTTON PICKER." Technical Sciences 4, no. 1 (2021): 42–49. http://dx.doi.org/10.26739/2181-9696-2021-1-7.
Full textAbstract:
In order for the use of the vertical-spindle cotton picker, created in Uzbekistan, to be economically effective, it is necessary, first of all, to increase its completeness of harvest. This indicator depends on many factors. However, the most important factor is that the spindle friction drive function is inadequate. Friction forces between the friction drive belts and the spindle roller determine its tagging capacity. The magnitude of the friction force depends on the pressure of the belts on the roller, which in turn depends on the tension of the drive belts. The article analyzes how much the tension of the drive belts in economic conditions meets the requirements.Key words:completeness of cotton picking by the apparatus; friction drive; belt tension; traction ability; direction and magnitude of the absolute speed of the spindle tooth; moment of power; variability of the angular speed of the spindle; gripping power of the tooth
47
Kim, Chung Hwan, Chong-Won Lee, and N. C. Perkins. "Nonlinear Vibration of Sheet Metal Plates Under Interacting Parametric and External Excitation During Manufacturing." Journal of Vibration and Acoustics 127, no. 1 (2005): 36–43. http://dx.doi.org/10.1115/1.1857924.
Full textAbstract:
This study is motivated by the vibrations that plague coating processes used in the manufacturing of coated sheet metal. These vibrations arise from time-dependent tension fluctuations within the sheet metal plate as well as from the eccentricity of the rollers used to transport the plate. The time-dependent tension is observed to be rather broad-band and creates multi-frequency parametric excitation. By contrast, the roller eccentricity is largely single-frequency (synchronized with the roller speed) and creates single-frequency external excitation. The plate and excitation sources are studied herein using a single-degree-of-freedom model with a cubic nonlinearity, subject to combined parametric and external excitation. In our study, we investigate the resonances that arise from the synergistic effects of multi-frequency parametric excitation and single-frequency external excitation. For the simpler case of single-frequency parametric excitation, we observe both sum and difference combination resonances in addition to principal parametric resonance. For the case of multi-frequency parametric excitation, we observe a frequency shift for the parametric resonance that derives from the cubic nonlinearity and external excitation. Moreover, the phase relationships of the external and each parametric excitation source have a significant effect on the resulting response amplitude. We use these analyses to explain the resonance mechanisms observed in experiments conducted on an example sheet metal coating process.
48
Chen, Bing, and Rui Juan Guo. "Electromechanical Hybrid Transmission Control System of Tension Leveler." Applied Mechanics and Materials 457-458 (October 2013): 727–30. http://dx.doi.org/10.4028/www.scientific.net/amm.457-458.727.
Full textAbstract:
For tension roller skidding and motor alarm phenomenon often appeared in the process of straightening. This paper take electromechanical hybrid drive system of tension leveler as example, analysis the control system, focusing on the dynamic tension load distribution, points out that the above situation can be avoid effectively by setting the parameter of tension reasonably. And the same time, speed control and torque control are analyzed in this paper, and it provides a reference for the further study of electromechanical hybrid transmission control system.
49
Gui, Hai-Lian, Qiang Li, and Qing-Xue Huang. "The Influence of Bauschinger Effect in Straightening Process." Mathematical Problems in Engineering 2015 (2015): 1–5. http://dx.doi.org/10.1155/2015/612840.
Full textAbstract:
The yield stress changes during the straightening process, because of the Bauschinger effect. This effect leads to a different reduction rate in each straightening roller. To accurately estimate the straightening effect of the rolled piece, the Bauschinger effect must be considered in calculating the reduction rate. In this paper, the straightening model is described by the fast multipole boundary element method. The Bauschinger effect model is discussed in the elastic loading region and elastic plastic loading region. Young’s modulus reduction and the reverse yield stress reduction are obtained for the straightening force model. The straightening force formula including the Bauschinger effect is determined by analyzing the tension and compression processes. This formula reflects the changes of the yield stress and the straightening force in the tension and compression processes. It is concluded that the Bauschinger effect is a very important factor for the precise estimation of the straightening force.
50
Zhao, Pei Jian, Cun Long Zhou, Wei Na Li, Qing Xue Huang, and Yuan Hua Shuang. "Analysis of the Strip Curvature in Tension Levelling with FEM." Advanced Materials Research 572 (October 2012): 308–11. http://dx.doi.org/10.4028/www.scientific.net/amr.572.308.
Full textAbstract:
Confronting the problem that echnology parameters are difficult to set in the strip tension levelling process, in this paper takes the tension leveler as research object, using the ANSYS software to make dynamic simulation of strip tension levelling process, mainly analyse relationship between the intermesh and curvature, get result that curvature radius during the straightening process is much larger than bending roller radius, as well as the relationship between curvature and the intermesh under the specific structure condition, the research provides help for the optimization of the tension leveler equipment technology parameters.