Journal articles: 'Reducera stress'

1

Hsieh, Chiu-Fan, and Wun-Si Jian. "The effect on dynamics of using various transmission designs for two-stage cycloidal speed reducers." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 230, no. 4 (November 29, 2015): 665–81. http://dx.doi.org/10.1177/0954406215618984.

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This paper investigates different transmission methods for a two-stage speed reducer by analyzing component motion and stress conditions during reducer operation. First, an exemplar (set) speed-reducing ratio is used to develop four differently structured two-stage speed reducers: a traditional design using two serially connected single-stage speed reducers, an Rotate Vector (RV) reducer constructed by serially connecting a cycloid speed reducer and an involute planet gear reducer, and two new concept designs. The first new concept named “New design 1” has a pin component in which a cam pair and pins connect two-stage cycloidal gears having different tooth numbers. The second new concept named “New design 2” has a center disc component in which a cam pair symmetrically connects two-stage cycloid gears with different tooth numbers. These four structural types of two-stage speed reducer form the basis for a system dynamics analysis model used to analyze the main components’ motion and stress variation conditions. Besides, this study also carries out the cycloid internal gear (nonpinwheel design) to replace the pinwheel in these four-structured two-stage speed reducers. The results highlight the differences and shortcomings of the four transmissions with pinwheel and nonpinwheel designs, including the dynamic load imbalance and stress peaks phenomena caused by design inadequacies.

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Lenz, Thomas L. "Herbal Supplements for Stress." American Journal of Lifestyle Medicine 5, no. 6 (September 2, 2011): 497–99. http://dx.doi.org/10.1177/1559827611418171.

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Many herbal products are currently being marketed to the public as having a positive effect on stress reduction. Little research has been conducted on these products that provide health care professionals with the information they need to advise their patients on safety and effectiveness. This brief review looks at the available data on some of the most popular herbal supplements that are marketed as stress reducers. Many of these herbal products can cause a sedative effect. Therefore, health care professionals must caution their patients who concomitantly take a prescribed medication that causes central nervous system depression as well as those who drink alcohol with a herbal stress reducer due to a potential added sedative effect.

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Tsai, Y. T., and K. H. Lin. "Structural Stress Analysis and Reliability Evaluation for a New Speed Reducer." Journal of Mechanics 33, no. 5 (September 13, 2016): 631–40. http://dx.doi.org/10.1017/jmech.2016.96.

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AbstractReducers are extensively used in many machines for reducing the speeds of mechanism. This paper proposed a new design of speed reducers to meet the performance requirements in high rigidness and large speed-reduction ratios. The movements of the reducer are designed based on the principles of differential displacements of the deceleration gear rings. The geometric models of the related components were designed using CAD software. The motions of mechanism were simulated for identifying the feasibility of designing including acquiring the kinematic properties. The mathematical models of structural stresses analysis were proposed so that the bending and contact stresses of the gear rings could be evaluated, accordingly. Finite element methods (FEM) were also used to analyze the structural stresses of the reducer. The studied results showed that the bending fracture of the gear rings would prior to its contacting fracture. The allowable loading of the reducer was then established according to the analyzed results of the maximum stresses on various transmitted torques. The methods of reliability evaluation were reported for considering the strength variation and calculating the reliabilities of the reducer at various loadings. The studied results are useful in structural design, stress analysis and reliability evaluation for developing high speed-reduction mechanisms.

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Huang, Jian, Chaoyang Li, and Bingkui Chen. "Optimization Design of RV Reducer Crankshaft Bearing." Applied Sciences 10, no. 18 (September 18, 2020): 6520. http://dx.doi.org/10.3390/app10186520.

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The crankshaft bearing is the key component of a rotate vector (RV) reducer. However, owing to the harsh working load and restricted available space, the bearing often suffers from fatigue failure. Therefore, this study proposes a novel optimization method for RV reducer crankshaft bearings. A nonlinear constraint optimization model for the design of the bearing considering the crowned roller profile is formulated and is solved by using a crow search algorithm. The goal of the optimization is to maximize the fatigue life of the bearing. The design variables corresponding to the bearing geometry and crowned roller profile are considered. The load working conditions of the bearing and structure of the RV reducer are analyzed. Various constraints, including geometry, lubrication, strength of the bearing, and structure of the RV reducer, are established. Through the optimization design, the optimum crowned roller profile suitable for the working load of the bearing is obtained, and the stress concentration between the roller and raceway is eliminated. Taking the crankshaft bearing of RV-20E and RV-110E type reducers as examples, the bearings were optimized by the proposed method. After optimization, the bearing life of the RV-20E type reducer is increased by 196%, and the bearing life of the RV-110E type reducer is increased by 168%.

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Cojocaru, Vasile, Zoltan Iosif Korka, and Calin Octavian Miclosina. "Stress Analysis and Optimal Design of the Housing of a Two-Stage Gear Reducer." Applied Mechanics and Materials 658 (October 2014): 183–88. http://dx.doi.org/10.4028/www.scientific.net/amm.658.183.

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The design of the housings of the gear reducers is made, usually, using empirical equations based on the center distance (the distance between shafts). These equations can lead to inappropriate stresses distribution and inadequate material consumption at the final product. In the manufacturing of large series and in the manufacturing of the gear reducers/ gearboxes with large dimensions it is necessary an optimization of the housing dimensions. The use of the finite element analysis in this process, combined with experimental researches, can generate significant improvements. The paper is focused on the analysis of stresses distribution and displacements on the housing of a two-stage helical gear reducer with parametric dimensions and loads. The housing is subjected to a static finite element study. The optimization process aimed to minimize the total weight of the housing. The next features were submitted to dimensional changes: the thickness of the housing walls and the thickness of the ribs. The results presented as diagrams of stresses and displacements distributions show real opportunities to reduce the total weight of the housing and the material consumption.

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Zhang, Jingzi, Jin’ge Wang, and Kai Wang. "Design and manufacture of the novel drum worm pair." Science Progress 103, no. 4 (October 2020): 003685042098122. http://dx.doi.org/10.1177/0036850420981220.

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Although a significant amount of research on robot joint reducer was conducted, there are few systematic investigations on a novel joint reducer adopting inner worm-gear plane enveloping drum worm drive. To satisfy the development of modular robot joint, the primary objective of this paper was to systematically investigate the drum worm drive adopted in the novel joint reducer with integrated structure of drive, transmission, and support in the following aspects: meshing theory, design, analysis, and manufacture. According to the gear meshing theory, mechanical design method, classical mechanics, finite element method, and machining principle of virtual center distance, the systematic investigations around the drum worm pair applied in the novel joint reducer were conducted including the macro and micro meshing theory, structure design, mechanical and contact properties analyses, and manufacturing method. The novel joint reducer’s integrated structure was designed, and the drum worm pair’s mechanical and contact properties analyses were conducted, which showed: (1) the worm’s bending stress and deflection, worm-gear teeth’s shear stress and bending stress as well as the maximum contact stresses were all below their corresponding allowable values; (2) the maximum contact stresses appeared at the engage-in position of the worm pair opposing to the engaging-out position where the largest contact areas appeared. Then the manufacturing of drum worm’s spiral tooth was conducted via the modified 4-axis linkage CNC grinder according to the conjugate motion. Finally the novel joint reducer’s industrial prototype was assembled. The novel joint reducer with integrated structure of drive, transmission and support was designed and manufactured for the first time. The flowchart of design and manufacture of the reducer’s drum worm pair in this process was formulated, which provides a new insight on the research of joint reducers as well as other fields.

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Yu, Yang, En Zhu, Xiaoyang Chen, and Yang Wang. "Load analysis and deformation research of the flexible bearing based on a three-force ring superposition method." Mechanics & Industry 22 (2021): 34. http://dx.doi.org/10.1051/meca/2021030.

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The flexible bearing is a key component of harmonic reducer enabling the flexspline to generate a controllable elastic deformation. Its performance and life will significantly affect the normal operation of harmonic reducer. In order to improve the life and the working performance of the flexible bearing, the calculation of its load distribution is necessary. Based on the theory of thin-walled ring, the relationship between radial deformation and load of three-force ring was derived. Then a superposition model of three-force ring was developed to calculate rapidly the load distribution of flexible bearings with elliptical cams in harmonic reducers. The validity of the proposed model was proved by comparing with a static analysis model. In this paper, the influences of ball number and external load on the load distribution, radial deformation and bending normal stress of outer ring were investigated by three-force ring superposition method. Based on the deformation of three-force ring, the deformation characteristics and bending normal stress distribution of outer ring of the flexible bearing were analyzed, and several regular results were found.

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Kalaivani, Mrs S., and Dr (Mrs) D. Karaline Karunagari. "Yoga as a Stress Reducer." International Journal of Trend in Scientific Research and Development Volume-2, Issue-3 (April 30, 2018): 1936–38. http://dx.doi.org/10.31142/ijtsrd11396.

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Chalah, Kaci, Abdelbaki Benmounah, and Khaled Benyounes. "Effect of anionic polyelectrolytes on the flow of activated sodium bentonite drilling mud." MATEC Web of Conferences 149 (2018): 01082. http://dx.doi.org/10.1051/matecconf/201814901082.

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Bentonite is often used in water-based drilling fluids. The xanthan gum is widely used as to increase the viscosity of the bentonite suspension. For the stabilization of the drilled layers, we use filtrate reducers: sodium carboxymethylcellulose low viscosity and cellulose polyanionic low viscosity. The objective of this work is to explain the effect of the polymers on the rheological behavior of the 5% bentonite suspensions. These results will provide practical recommendations for the rational use of different types of additives in water-based drilling muds. Our work is based on rheological trials on a viscometer. The results obtained on the bentonite 5%-xanthane suspension show a rheofluidifying behavior with yield stress conform to the Herschel-bulckly modal. While increasing the concentration of filtrate reducer decreases the yield stress and reduces the viscosity. The effect of CMC LV is more pronounced than PAC L.

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Zhang, Jing, and Fei Wang. "Finite Element Analysis of Temperature Filed and Stress Field of Reducer." Advanced Materials Research 881-883 (January 2014): 1447–50. http://dx.doi.org/10.4028/www.scientific.net/amr.881-883.1447.

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Abstract.The connection mode of reducer with straight tube on both sides are the welding connection. There are two weld at the both side of reducer and there has a great influence on residual stress and deformation in the process of welding . Based on the particularity of reducer welding, the paper is focus on the residual stress and deformation in the process of welding, using large-scale finite element analysis software ANSYS .The DN500X450 reducer model is established.The welding temperature field and residual stress field is analysis and calculation and analysis the influence on temperature and stress distribution of reducer. The results show that the maximum of the temperature and the residual stress is located in the big side and reduce the welding seam, and the obvious deformation also find in the big side and reduce joint . The reducing pipe’s distribution of temperature field and residual stress field are obtained,providing the basis to establish properly and optimize of welding process.

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11

Wang, S. "Stress Analysis and Design of Main Reducer Housing Using Finite Element Method." MATEC Web of Conferences 221 (2018): 04008. http://dx.doi.org/10.1051/matecconf/201822104008.

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The main reducer housing takes over the shaft loads from gear engagement and transmits to other components, such as differential, semiaxle and driving wheels, so the main reducer housing with enough strength and stiffness is very important. Some factors preventing it from failure need to be taken into consideration when design it. To design a main reducer housing with better performance, in this paper, FEA (Finite Element Analysis) is used to analysis the main reducer housing and to find out some big stress regions. Then, some modifications are proposed to eliminate those big stress regions and obtain a reliable main reducer housing. During the analysis process, an annulus model is built and the reaction forces between the differential bearing seats and axle housing are calculated to determine whether they contact with each other. Finally, some design methods and improvements of the original design main reducer housing are proposed. And numerical comparison results of the stress distribution of the original and improved main reducer housing validate the effectiveness of the proposed methods and modifications in this paper. Those stress analysis and modifications in this paper are time-saving and money-saving before mass production.

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He, Yi Bin, Bing Kuan Yang, Yu Zhang, Shi Wen Liu, and Ding Fang Chen. "Lightweight Study on Gear Reducer Box Structure Based on Finite Element Analysis." Advanced Materials Research 823 (October 2013): 20–23. http://dx.doi.org/10.4028/www.scientific.net/amr.823.20.

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On the basis of the analysis of the problems existing in the current research on gear reducer structure, using Solidworks to reducer box structure finite element analysis, by changing the angle of the rib plate and rib plate thickness, the size of the box thickness and the thickness of the bottom plate, based on a comparative study on the experimental data, the comprehensive analysis of the change of the stress and displacement, enclosure structure stress and deformation with the change of size of box body, and eventually make the reducer box to achieve optimization of the structure, lightweight design for the reducer box to explore effective ways and means, has a certain practical significance. Keywords: Solidworks;Finite Element Analysis;Gear Reducer Box;Lightweight;

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13

Li, Fanjie, Xiaopeng Li, Yajing Guo, and Dongyang Shang. "Analysis of Contact Mechanical Characteristics of Flexible Parts in Harmonic Gear Reducer." Shock and Vibration 2021 (March 24, 2021): 1–17. http://dx.doi.org/10.1155/2021/5521320.

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Harmonic gear reducer is widely used in industrial robots, aerospace, optics, and other high-end fields. The failure of harmonic gear reducer is mainly caused by the damage of flexible bearing and flexspline of thin-walled vulnerable components. To study the contact mechanical characteristics of flexible components such as flexible bearing and flexspline in harmonic gear reducer, the contact mechanical model of flexible bearing, vibration differential equation of flexspline, and finite element model of each component in harmonic gear reducer were established. Based on the established model of harmonic gear reducer, the influence of the length of flexspline cylinder and the thickness of cylinder bottom on the stress of flexspline is discussed, respectively, and the motion characteristics of flexible bearing are studied. At the same time, the spatial distribution of the displacement of the flexspline and the axial vibration response of the flexspline are studied. The correctness of the model established in this paper is verified by experiments. The results show that the increase of cylinder length can improve the stress of flexspline in harmonic gear reducer; the wall thickness of cylinder bottom mainly affects the stress at the bottom of flexspline but has little effect on the stress of gear ring and smooth cylinder. Along the axis direction of the flexspline, the radial displacement, circumferential displacement, and angular displacement increase linearly with the increase of the axial distance between the cylinder and the bottom. When the excitation frequency is high, the vibration mode of flexspline shell is mainly axial vibration. The research results will provide a theoretical reference for the optimal design of harmonic gear reducer and improving the service life of flexible parts.

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14

E, Jia Qiang, Guang Ming Li, Bin Zhang, and Jiang Dong Dong. "Fatigue Simulation and Analysis on Planetary Gear of Megawatt Wind Power Yaw Reducer." Advanced Materials Research 455-456 (January 2012): 180–86. http://dx.doi.org/10.4028/www.scientific.net/amr.455-456.180.

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The new type wind power yaw reducer has been virtually assembled in Pro/E for the operating conditions of the Megawatt wind power yaw reducer. The planetary gear contact model of the new type wind power yaw reducer has been built to simulate the change of the contact stress in the process of planetary gear operation with the interface of Pro/E and ANSYS. The results show that: the initial maximum contact stress of the meshing planetary gear is 395MPa and the maximum stress in the engagement process is 460MPa, but it is still less than the material yield limit of the planetary gear. The results also show that the fatigue life of the gear teeth is 125,800 times, the cumulative fatigue factor is 0.72501 by analyzing the fatigue loads and 42CrMo’s S-N curve of Megawatt wind power yaw drive planetary gear, so it can meet the design and operation requirements for the Megawatt wind power yaw reducer.

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Sang, Z. F., and G. E. O. Widera. "Stress and Strength Analysis of Concentric Reducers Consisting of Plates." Journal of Pressure Vessel Technology 110, no. 2 (May 1, 1988): 217–24. http://dx.doi.org/10.1115/1.3265592.

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This paper presents a new kind of piping component—a concentric reducer consisting of plates. Authors performed experimental and elastic, elastic-plastic analyses on five test models having different structural parameters. The elastic stress distribution under hydraulic test pressure, the extension of the plastic region under higher than operating loads and the results of bursting tests are also reported on. Results indicate that under test pressure the maximum stress occurs at the inside of the junction area between the small end of the reducer and the small end tube. Yield and final burst also occurs at this area under higher than operating pressure. Based on the results of the analysis, it can be concluded that the reducer is safe and reliable.

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E, Jia Qiang, Jiang Dong Dong, and Guan Lin Liu. "Contact Simulation and Analysis on Planetary Gear of Megawatt Wind Turbines Yawing Reducer." Advanced Materials Research 455-456 (January 2012): 187–93. http://dx.doi.org/10.4028/www.scientific.net/amr.455-456.187.

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.According to the operation condition of megawatt wind turbines yawing reducer, an assembly model of megawatt wind turbines yawing reducer is established, and aiming at different load conditions, the tooth surface of three teeth planetary gear model is analysised with using finite element analysis software-ANSYS ,including three-dimensional nonlinear contact analysis and structural finite element analysis which simulates contact stress of engagement pairs during the operation process of planetary gear. The results indicated that when the torque is M1=100N·m, the maximum stress on the engagement pairs is 177.584MPa; when the torque is and M2=300N·m, the maximum stress on the engagement pairs is 329.607MPa, which were less than the yield limit of planetary gear materials, but it can meet the design and operation requirements of planetary gear of megawatt wind turbines yawing reducer.

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Hu, F., L. Q. Chen, B. Qi, and W. W. Chen. "Finit Element Analysis and Optimum Design of Time-Sharing 4WD Vehicle Main Reducer." Applied Mechanics and Materials 246-247 (December 2012): 692–96. http://dx.doi.org/10.4028/www.scientific.net/amm.246-247.692.

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By carrying on the stress and transform analysis of the box of a kind of main reducer which was self— designed and manufactured for vehicles, by ROMAX modeling get accurate bearing load and conducting ANSYS finite element analysis. it is shown that structure design of the main reducer box is very important for the intension capability of the box, and for the transmission functions of the main reducer. The hidden trouble of the main reducer transmission due to the designers was solved, which couldn’t estimate the transform of main reducer box by traditional design method, and provided the necessary basis for further optimizing and ameliorating the whole transfer case system. By using the UG software we constructed a complicated model of the box, and carried on a series of accurate intension and fatigued analyses for the model by using ANSYS software.

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Li, Yuan Yuan, Meng Wang, and Yu Chao Guo. "Mechanics Analysis and Finite Element Solution on Tapper Assembly of Automobile’s Drive Axle." Applied Mechanics and Materials 614 (September 2014): 19–23. http://dx.doi.org/10.4028/www.scientific.net/amm.614.19.

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Mechanical research on structural strength is done for the driving taper assembly of automobile in this paper, of which the assembly process is also explained. Based on theoretical analyses of the connection between tighten torque and axle force, the analytical model of the main reducer is established. In order to get the stress field and displacement field of the main reducer after assembly, which is used to conduct strength check, finite element analysis method is introduced. Based on these results, some theoretic suggestions for design and manufacture of the main reducer are provided.

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Liu, Yan Kui, and Yun Ling Wei. "The Performance Study of Three-Ring Gear Reducer." Advanced Materials Research 605-607 (December 2012): 1261–64. http://dx.doi.org/10.4028/www.scientific.net/amr.605-607.1261.

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According to relevant dynamics theory, finite element model of a three-ring gear reducer was established considering the deformation of gear’s teeth. The finite element model was analyzed under different phase angle, the real contact teeth and the stress in contact teeth was got from the analysis, which could steering the design of the three-ring gear reducer.

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Li, Rong Hao, and Jue Yang. "The Gear Tooth Profile Form of the Mining Truck Wheel Edges Reducer Based on RomaxDesigner." Applied Mechanics and Materials 602-605 (August 2014): 229–33. http://dx.doi.org/10.4028/www.scientific.net/amm.602-605.229.

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When the wheel of the wheel edges reducer working, single tooth meshing and bidentate meshing alternately, Gear meshing dislocation, mutation load, speed fluctuations, engaging-in and engaging-out impact will inevitably appear. This paper take the wheel hub reducer based on 60t AC drive articulated dump truck as the research object, use romaxdesigner model and motion simulation analyze the wheel edges reducer. through the analysis obtain the stress and the longevity of gear. According to the simulation results correct the gear for the purpose of improving the bearing capacity of the gear and reducing meshing noise.

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21

Ali, Jasem Mohamad, and Krauinsh Peter Yanovich. "Analysis of the Stress-strain State (SSS) Under Static Load of Nutation Speed Reducer." Journal of Advanced Research in Dynamical and Control Systems 11, no. 10 (October 31, 2019): 137–41. http://dx.doi.org/10.5373/jardcs/v11i10/20193016.

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Zhu, Li Li, and Guang Xin Wang. "Distribution on Transmission Ratio of Cylindrical Gear Reducer." Advanced Materials Research 605-607 (December 2012): 1295–98. http://dx.doi.org/10.4028/www.scientific.net/amr.605-607.1295.

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The purpose of this paper is to provide two kinds of method to distribute the transmission ratio of three-stage cylindrical gear reducer. In the process, all the gears have the full contact stress in every stage. Besides, one method can also obtain the minimum volume of gear reducer and another one is to make all big gears have good flood lubrication. According to the two principles, the equations of distribution on transmission ratio and further a practical distribution graphic are examined, which have the applicable significance of actual engineering and can be the base of the distribution on transmission ratio of other kinds of gear reducer.

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Dong, Ming Wang, Ting Ting Yang, and Lin Wu. "The Transmission Design and Production of Cylindrical Cam and Gear Joint Transmission Reducer." Applied Mechanics and Materials 684 (October 2014): 323–29. http://dx.doi.org/10.4028/www.scientific.net/amm.684.323.

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Design a kind of reducer, the first stage transmission is a cylindrical cam, the secondary stage transmission is a gear transmission. Multistage transmission of the reducer has carried on the design calculation and checking. On the basis of the lateral cylindrical cam lateral transmission mathematical model, conducted the spiral curve analysis and calculation with numerical analysis software MATLAB. Import the spiral curve data into SOLIDWORKS to complete the 3D modeling of cylindrical cam. According to the structural design of cylindrical cam, complete reducer machine design and virtual assembly of gearless reducer. The stress analysis was carried out on the cam disk with the ANSYS Mechanical Analysis Module of SOLIDWORKS, designed to meet the working conditions. Conducted physical development based on CAD and CAE. The result showed that the design was fast and effective, significantly shorten the production cycle.

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Li, Yuan, and Chen Zhu. "Analysis of the Multi-Tooth Meshing Effect of Three-Ring Gear Reducer." Applied Mechanics and Materials 155-156 (February 2012): 531–34. http://dx.doi.org/10.4028/www.scientific.net/amm.155-156.531.

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Three-ring reducer is a type of epicyclic gear drive with small tooth number difference and internal gear. It is different from other gear transmission, that the load shearing factor of multi tooth contact is much smaller. On the basis of analyses of geometry, tooth deformation and manufacturing errors, a mathematical model which describes the state of multi tooth contact and the load distribution characteristics of tooth was developed. The multi- tooth meshing effect of the three- ring gear reducer is studied used the finite element method and ANSYS finite element software. While three- ring gear reducer is running, the number of teeth contacted simultaneously, their load distribution characteristics and the von Mises stress change are gained.

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Li, Yuan, and Chen Zhu. "Analysis of the Multi-Tooth Meshing Effect of Three-Ring Gear Reducer." Applied Mechanics and Materials 214 (November 2012): 87–91. http://dx.doi.org/10.4028/www.scientific.net/amm.214.87.

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Three-ring reducer is a type of epicyclic gear drive with small tooth number difference and internal gear. It is different from other gear transmission, that the load shearing factor of multi tooth contact is much smaller. On the basis of analyses of geometry, tooth deformation and manufacturing errors, a mathematical model which describes the state of multi tooth contact and the load distribution characteristics of tooth was developed. The multi- tooth meshing effect of the three- ring gear reducer is studied used the finite element method and ANSYS finite element software. While three- ring gear reducer is running, the number of teeth contacted simultaneously, their load distribution characteristics and the von Mises stress change are gained.

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Romero Vallejos, Anyelo David, and María Isabel Rodríguez-Riveros. "Conocimiento e intervenciones no farmacológicas para reducir dolor y estrés neonatal." Memorias del Instituto de Investigaciones en Ciencias de la Salud 17, no. 3 (October 28, 2019): 34–40. http://dx.doi.org/10.18004/mem.iics/1812-9528/2019.017.03.34-040.

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Xu, Qiang, Qi-sheng Xu, and Dao-Yi Xu. "Research on the Maximal Bearing Capacity Calculation of a New Double Ring Reducer Based on MATLAB." Open Mechanical Engineering Journal 9, no. 1 (February 13, 2015): 34–39. http://dx.doi.org/10.2174/1874155x01509010034.

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The bearing capacity of a new double ring reducer increases with the increase of load because of the elastic deformation of the gear tooth. In order to solve the problem of its bearing capacity quantificationally, the concept of the maximal bearing capacity is put forward. Starting with that the single tooth bending stress is up to the bending fatigue strength, a mathematical model to determine the normal backlash of the gear teeth has been established, the maximal deformation of the single tooth has been determined. The mathematical relationships have also been setup between the normal backlashes of the tooth pairs, the maximal deformation and number of contact points, a corresponding MATLAB program is designed. The maximal bearing capacity of the reducer has been estimated through examples and proved by experiment. The results show that the calculation method is more effective and fully considers the factors that the elastic deformation of the gear tooth can increases its bearing capacity, so the structure of the reducer is more compact, which establishes the theory foundation for designing the reducer.

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Sun, Ying Shi, Tian Min Guan, and Xu Zhang. "Dynamic Simulation of Cycloid Wheel at Two Support Points of Needle Gear pin for New Three-Gear Pin-Cycloid Driven Speed Reducer." Advanced Materials Research 291-294 (July 2011): 1195–99. http://dx.doi.org/10.4028/www.scientific.net/amr.291-294.1195.

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Pin-cycloid driven speed reducer with three cycloid gears adopts the new driving structure of three cycloid gears at eccentric angle of 120 between each other. Three main stresses act on the cycloid gears: the stress between pin gear and cycloid wheel gear, the stress on cycloid wheel by cylinder pin of output mechanism and the stress on cycloid wheel by bearing of rotating arm. In this paper, the stress between needle gear and cycloid wheel gear is analyzed mainly by analysis.

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Zhang, Zhenhua, Jiaxu Wang, Guangwu Zhou, and Xin Pei. "Analysis of mixed lubrication of RV reducer turning arm roller bearing." Industrial Lubrication and Tribology 70, no. 1 (January 8, 2018): 161–71. http://dx.doi.org/10.1108/ilt-12-2016-0311.

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Purpose This paper aims to solve the lubrication failures in the turning arm bearing of RV reducer, give some help in perfecting the bearing structure design and provide theoretical basis for the reducer’s performance improvement. Design/methodology/approach The paper establishes a mixed lubrication analysis model to study performance parameters. According to the discretization of parameters and iteration of equations, numerical simulation and theoretical analysis are achieved in computational process. Findings Considering influences of contact load, real rough surface and realistic geometry of RV reducer turning arm roller bearing, the mixed lubrication analysis model is established to study the ratio of oil film thickness, pressure distribution and maximum von Mises stress in different speeds, temperatures and fillets. The results of mixed lubrication show that reasonable round corner modification, increase in temperature and speed, decrease of surface roughness and lubricant types can improve the lubrication performance. Originality/value The mixed lubrication analysis model is established to study the influences of contact load, real rough surface and realistic geometry of RV reducer turning arm roller bearing. Different speed, temperature, lubricant and fillet modification are also considered in the research to analyze oil film thickness, pressure distribution and maximum von Mises stress. These studies can optimize structural design of bearing and direct engineer operations.

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Lading, Åse. "Stress blandt gymnasielærere." Tidsskrift for Arbejdsliv 9, no. 2 (June 1, 2007): 55. http://dx.doi.org/10.7146/tfa.v9i2.108611.

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Artiklen bygger på en større undersøgelse af gymnasielæreres oplevelse af at de som noget nyt skal indgå i tværfaglige team. Kravet indgår som led i de omfattende forandringer der i disse år sker i gymnasieskolen. Artiklen argumenterer for at i modsætning til hvad man kunne forvente, skaber disse team ringere betingelser for afstressende kollegiale relationer. De faglige og personlige modsætninger i teamene indvirker negativt på det sammenhold der traditionelt udfoldes på lærerværelset. Det overraskende er imidlertid at lærerne fastholder et meget positivt billede af fællesskabet. Dette paradoks forstås ud fra Axel Honneths begreber om anerkendelse og krænkelse samt psykodynamisk inspirerede gruppeteorier om forsvar mod angst. Konklusionen er ikke at man bør opgive teamarbejde. Samarbejdet skal i stedet videreudvikles således at det bidrager til etableringen af en professionel kultur der kan anerkende medarbejderne samt rumme og lære af forskelle og konflikter. Dette ses som et afgørende led i bestræbelserne på at reducere stress på arbejdspladsen.

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Hu, Hao, and Ying Min Yan. "Light Bus Drive Axle Design." Applied Mechanics and Materials 380-384 (August 2013): 17–22. http://dx.doi.org/10.4028/www.scientific.net/amm.380-384.17.

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In this paper, through the study of traditional light bus, found problems related to screening and using existing methods, bridge drive of light bus was designed. First determine the drive axle transmission ratio and reasonable distribution; secondly on the driving axle main transmission device structure and parameter design, including the design of main reducer, differential, half shaft design; finally completed the design of driving axle housing, in order to design the drive axle complete. And the use of traditional mechanical analysis methods of main parts of the driving axle ( reducer, differential, half shaft, axle and so on) for the strength analysis and calculation, including the gear bending stress calculation, strength check; gear contact stress calculation, strength check; half shaft torsional stress calculation. With the design idea and the design requirements of the rapid development, the three-dimensional design has become a necessary skill for designers, this paper introduces the basic functions of Pro/Engineer software and a simple application, and the design of the parts of the drive axle using the software.

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Cao, Ju Jiang, Cheng Guo Feng, and Lei Zhang. "Finite Element Analysis of Multi-Roller Contact Roller-Gear Cam Reducer." Applied Mechanics and Materials 271-272 (December 2012): 917–21. http://dx.doi.org/10.4028/www.scientific.net/amm.271-272.917.

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This paper presents the multi-roller contact roller-gear cam reducer. It’s a special kind of the indexing roller-gear cam that changes the stopping stage of the indexing cam to zero and chooses the equal-velocity law. And with multi-roller contact the carrying capacity is greatly improved. In this paper, we created the 3D solid model of the main components of the reducer: the cam, the turntable and the rollers. After that, we used the FEA software ANSYS Workbench to calculate the static structural behavior and the results showed us the weak or dangerous part of the mechanism so that we can optimize the structural. However the static structural behavior does not always shows the working condition. Thus we calculated the flexible dynamic behavior of the reducer and it showed us vividly that which part is weak and we could see the real deformation and stress distribution of the structural while working. Then we can pay more attention to these parts.

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Guan, Feng, Chuanxi Zhou, and Qingshi Huang. "An Innovative Planetary Gear Reducer with Overcoming the “Dead Point”." Open Mechanical Engineering Journal 7, no. 1 (October 18, 2013): 70–75. http://dx.doi.org/10.2174/1874155x01307010070.

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This paper proposes an innovative planetary gear reducer with overcoming the “dead point”, which is to be able to maintain expected reduction ratio by overcoming the “dead point” during the transmission motion. The motion characteristic is combined with the features of parallelogram mechanism transmission and planetary transmission mechanism with small teeth number difference. Structure analysis and force analysis of the mechanism are provided to explain working principle and kinematic feasibility of the mechanism. Three basic structure forms are proposed with a simple ring plate, two ring plates and three ring plates. In addition, the force analysis and the stress state analysis of ring plate based on a series of engineering software are carried on in detail. This study has the significance on design calculation and structure optimization of this kind of innovative planetary gear reducer.

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Rivera-Encinas, María Teresa. "Efectividad del uso del mate de coca en la reducción del estrés laboral en administrativos de una universidad." Horizonte Médico (Lima) 16, no. 3 (September 30, 2016): 20–28. http://dx.doi.org/10.24265/horizmed.2016.v16n3.04.

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An, Ning, and Liu Hai. "Finite Element Analysis of Rolling Process for Pilger Mill." Advanced Materials Research 881-883 (January 2014): 1420–23. http://dx.doi.org/10.4028/www.scientific.net/amr.881-883.1420.

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For the simulation of cold rolled 20Cr steel pipe rolling process the DEFORM-3D being used, the simulation results include the equivalent stress, equivalent strain and rolling force distribution in deformation zone. The stress state of the pipe reducer section is analyzed, analysis shows that the simulation result is approximate the theoretical calculation. The simulation result shows the roll pass and openning effect on the rolling pipe. A view put forward is to compare the simulation results with the actual production and find out their differences. A proposal is made to establish a corresponding database based on simulation and production data.

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Zhang, Xu, Qiao Ling Liu, and Yu Qing Hu. "The Study on Workability and Mechanical Properties of High Volume Fly Ash Underwater Concrete." Advanced Materials Research 905 (April 2014): 235–38. http://dx.doi.org/10.4028/www.scientific.net/amr.905.235.

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In this paper, in order to resolve contradiction that is between high workability and anti-segregation in fresh concrete, low early strength and poor carbonation resistance property of concrete and high volume fly ash addition, high performance water reducer is used to reduce yield stress in fresh concrete, mineral mixture and flocculating agent are used to adjust viscosity and measure of activation enhances early strength of this concrete.

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Gonzalez Rodriguez, Humberto, Deshira D. Wallace, and Clare Barrington. "Contextualizing Experiences of Diabetes-Related Stress in Rural Dominican Republic." Qualitative Health Research 29, no. 6 (November 18, 2018): 857–67. http://dx.doi.org/10.1177/1049732318807207.

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Type 2 diabetes (T2D) is changing the burden of disease across Latin America. In this formative, qualitative study, we explored experiences of T2D diagnosis and management among adults in rural Dominican Republic. We conducted 28 in-depth interviews (12 men, 16 women) and used inductive analysis to explore the emotional burden of T2D and identify coping strategies. We found that stress relating to T2D began at diagnosis and persisted throughout management. Stress was produced by concerns about healthy food and medication access, fears about illness-induced injury, and the cyclical process of experiencing stress. Participants identified diabetes care and free medication services as external stress-reducers. Internally, participants’ mitigated stress by not thinking about diabetes (“ no dar mente”). Our study highlights the importance of a contextualized understanding of diabetes-related stress and the need for individual, clinic, and community-level interventions to reduce stressors and improve health outcomes among adults with T2D.

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Guo, Zhi Qiang, Yue Fan Zhao, Xue Ping Ren, and Li Liang. "Finite Element Analysis of Converter Tilting Mechanism Helical Gear Reducer in Abnormal Meshing Condition." Applied Mechanics and Materials 389 (August 2013): 519–23. http://dx.doi.org/10.4028/www.scientific.net/amm.389.519.

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Considering abnormal meshing condition of converter tilting mechanism helical gear reducer,creating 3D helical gear models under normal meshing condition and abnormal meshing condition. By using the finite element method to perform a nonlinear contact analysis on helical gear, the results of gear contact stress under different meshing conditions was obtained. It provides a theoretical basis for the accurate analysis of the reasons for the failure, the optimum design and safe use of the gear.

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He, Lu Zhong, Qin Zhou, Yao Sen Du, and Bin Bin Li. "Design and Finite-Element Analysis on Double-Circular-Arc Gear of the Turbodrill Reducer." Advanced Materials Research 926-930 (May 2014): 1247–52. http://dx.doi.org/10.4028/www.scientific.net/amr.926-930.1247.

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The double-circular-arc gear bearing capacity is the key problems for realizing the low speed and high torque work demands of small-diameter deep-well turbodrill reducer. Double double-arc gear shaft structure is adopted for improving the gear bearing capacity Based on the 2K-H-NGW type planetary gear transmission. Increase modulus and decrease teeth number properly can improve the double-circular-arc gear capacity on the premise of limited radial size. This article analyze the gear bending stress based on ANSYS and simulation results show that stress mainly concentrated on tooth root and tooth waist area and maximum loading is at tooth waist area. The simulation maximum bending stress is 289N/mm2 and the theoretical bending stress is 277.50N/mm2.The two results are basically identical. It is consistent with the actual work situation.

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Guan, Tian Min, Jiang Bo Li, and Lei Lei. "Tooth Surface Contact Fatigue Reliability Analysis of Cycloidal Gear Based on Monte-Carlo." Advanced Materials Research 605-607 (December 2012): 811–14. http://dx.doi.org/10.4028/www.scientific.net/amr.605-607.811.

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All sorts of design variables and parameters are often regarded as fixed values in the traditional design, it cannot describe quantitatively how well the products are safe. It is necessary to make a reliability analysis of cycloidal gear, which is the key part of FA pin-cycloidal transmission, this paper uses Monte-Carlo method to simulate and test the distribution laws of the contact stress and the contact fatigue strength of cycloidal gear, which indicates that the contact stress obeys the normal distribution and the contact fatigue strength obeys the lognormal distribution, besides, makes a sensitivity analysis of the random parameters, all these work lay the foundation for the reliability analysis of the whole reducer.

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Kin, Y., and R. Dubrovsky. "New Power Transmission Chain Design." Journal of Vibration and Acoustics 108, no. 3 (July 1, 1986): 255–61. http://dx.doi.org/10.1115/1.3269336.

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Precision multiple roller power transmissions are investigated in this work. These chains transfer significant power and move with very high velocity. They are subjected to variable loading with strong vibration and impact components, and require forced stream lubrication. Because of these severe working conditions, chain life is limited by the fatigue, and the chain plates are the weakest elements in many cases. It is shown that fatigue life is significantly decreased by fretting action, high stress concentration in the plates, and the impossibility of maintaining a uniform force distribution across the multiple lines of a chain. The results of the performed experimental stress analysis under static and variable loading are given for the different plate geometries. The plates with a variety of stress reducers located in different areas are investigated, and theoretical and effective stress concentration factors are determined. Based on that, new plate chain designs are proposed. These new designs use fewer lines to transfer the same power as conventional chains.

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KODALI, HARITHA, and Dr V. RAVINDRA KUMAR Dr V. RAVINDRA KUMAR. "A Single Case Study on Effect Of Music Therapy to Reduce Stress Levels in a Cancer Patient." International Journal of Scientific Research 3, no. 2 (June 1, 2012): 519–20. http://dx.doi.org/10.15373/22778179/feb2014/173.

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Zhang, Yong Qi, Qing Chang Tan, Jian Gang Li, and Kuo Zhang. "Fatigue Life of Taper Roller Bearings in Drive Rear Axle Main Gear Reducer." Advanced Materials Research 510 (April 2012): 112–16. http://dx.doi.org/10.4028/www.scientific.net/amr.510.112.

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Taper roller bearings are important parts of drive rear axle main gear reducers, and their work property affect behavior of the reducers.The roller bearings are obtained under applied load and inertia force that affects both meshing contact of the gears and raceways of the bearings. The influence is analyzed in this paper to improve the service life of the roller bearings by finite element method in this work. Firstly, a finite element model of roller bearings is established.Stress fields in the roller and the raceway are calculated by adding load and solving. Then,obtaining the maximum stress of the bearings, and the maximum stressand displaced shape are showed. Finally, the fatigue life of the bearings are analyzed by the obtained the maximum stress .

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Seong, Ki Moon, Mira Yu, Kyu-Sun Lee, Sunhoo Park, Young Woo Jin, and Kyung-Jin Min. "Curcumin Mitigates Accelerated Aging after Irradiation inDrosophilaby Reducing Oxidative Stress." BioMed Research International 2015 (2015): 1–8. http://dx.doi.org/10.1155/2015/425380.

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Curcumin, belonging to a class of natural phenol compounds, has been extensively studied due to its antioxidative, anticancer, anti-inflammatory, and antineurodegenerative effects. Recently, it has been shown to exert dual activities after irradiation, radioprotection, and radiosensitization. Here, we investigated the protective effect of curcumin against radiation damage usingD. melanogaster. Pretreatment with curcumin (100 μM) recovered the shortened lifespan caused by irradiation and increased eclosion rate. Flies subjected to high-dose irradiation showed a mutant phenotype of outstretched wings, whereas curcumin pretreatment reduced incidence of the mutant phenotype. Protein carbonylation and formation ofγH2Ax foci both increased following high-dose irradiation most likely due to generation of reactive oxygen species. Curcumin pretreatment reduced the amount of protein carbonylation as well as formation ofγH2Ax foci. Therefore, we suggest that curcumin acts as an oxidative stress reducer as well as an effective protective agent against radiation damage.

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Wang, Chin Yu. "Design of Planetary Gear Reducer with Double Circular-Arc Helical Gear." Applied Mechanics and Materials 152-154 (January 2012): 1595–600. http://dx.doi.org/10.4028/www.scientific.net/amm.152-154.1595.

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The two gears of the double circular-arc helical gear is a mesh of a concave/convex combination. Because the curvature is close to each other, the strength also increased and thus, it is often used in heavily-loaded workplaces. The national standard for double circular-arc helical gear (ex., GB12759-91) is based on the size of the gear module to design its tooth profile. This shows that tooth geometric-related designs are quite complicated. If the effect of the different pressure angle parameter is considered, we would be unable to conduct relevant studies for the original standard formula with a double circular-arc helical gear set at a pressure angle of 24°. Firstly, this paper would redefine a new double circular-arc helical gear according to the discontinuousness tooth profile molded line of the double circular-arc helical gear and unchangeable pressure angle and explain the improvements in the design and stress analysis of the tooth especially since the double circular-arc helical gear has no limitation in the minimum number of teeth. Thus, the decrease in the driving gears’ number of module and can further increase the reduction gear ratio. For heavily-loaded planetary gear reducer, it’s quite obvious in the miniaturizing and high torque superiority. This paper also used certain winch’s speed reducer as example to explain that the change of the pressure angle can reduce contact stress by 3%~40% and also enhances the torque ability by 3%~40%.

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Wang, Xin, Xuan Zhou, and Cheng Qun Li. "Study on the Structure of the Flexspline of Harmonic Reducer." Applied Mechanics and Materials 385-386 (August 2013): 344–47. http://dx.doi.org/10.4028/www.scientific.net/amm.385-386.344.

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According to the flexible gears damage problem during the work process of the harmonic reducer, a FEM model of the flexible and wave generator was established. On the basis of the mechanics of materials and the finite element theory, a large number of numerical simulations by the use of the finite element software were made. The analysis shows that: the dangerous area is between the flexspline tooth rim and cylinder part. On this basis, the equivalent strain and equivalent stress at different transition fillet were discussed by the use of numerical simulation. The results show that: the equivalent strain and equivalent stress are decrease with the increase of the transition fillet. It provides a basis theory of the optimization design of the flexspline.

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Wu, Ran Ran, and Ding Fan. "Air Pressure Reducer Modeling by CFD Methodology." Advanced Materials Research 960-961 (June 2014): 547–50. http://dx.doi.org/10.4028/www.scientific.net/amr.960-961.547.

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In this paper, the computational fluid dynamics (CFD) methodology as well as the shear-stress transport (SST) k-omega turbulence model was adopted to model the air pressure reducer (APR). Changing the gas needle’s displacement of APR continuously, the writer obtains the displacement-pressure characteristics of APR. In order to demonstrate the validity of these characteristics, a physical experiment was conducted, which generates another displacement-pressure characteristic. Comparing the two characteristics with a good agreement, it is indicated that the CFD methodology is suitable to study the displacement-pressure characteristics of APR.

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Sheng, Ji Sheng, and Su Jiang Dai. "Factor Analysis of Cracks Generated in 22CrMoH Steel Gear." Advanced Materials Research 150-151 (October 2010): 1039–42. http://dx.doi.org/10.4028/www.scientific.net/amr.150-151.1039.

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Cracks is frequently generated in crown gear of main reducer of big modulus used in heavy duty truck after carbonizing and quenching. The heat treatment process and the pre-heat treatment before carbonizing, the carbonization process parameter and the quench treatment, all of which influence the component, structure and stress of the gear. In this paper, metallographic examination of the gear was taken after heat treatment with different process parameter, and the reasons that caused cracks in the 22CrMoH steel crown gear used in heavy duty truck after heat treatment was discussed. And strategies and methods are proposed as well.

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Caizhi, Zhu, Wang Xiaojing, Li Zhaolun, Liu Jun, and Zheng Jiaqi. "Research on static and dynamics mechanical characteristics of flexible bearing in harmonic reducer." International Journal of Advanced Robotic Systems 17, no. 2 (March 1, 2020): 172988142091995. http://dx.doi.org/10.1177/1729881420919953.

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Flexible bearing is an important component of harmonic reducer which is widely used in automation equipment, especially in industrial robots. Studying its mechanical characteristics has great significance. In this article, the theoretical model of contact force between rolling elements and outer ring is established based on three bending moment equations, and the characteristics of CSF-40-80 flexible bearing are also studied by finite element method analysis. Analysis of equivalent stress at static state has shown that it already has large equivalent stress before load and that external load has a great influence on it. The dynamic and contact characteristics of it after actual assembly are also presented in this article. The displacements and velocities at different locations at different times of the movement are found to be different, which can provide a reference for the manufacture of flexible bearing.

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Mahardhika, Pekik, Adi Wirawan Husodo, George Endri Kusuma, Raden Dimas Endro Witjonarko, and Ekky Nur Budiyanto. "Analysis of Symmetrical and Nonsymmetrical Vertical Expansion Loop to Increase Flexibility And Reduce Pipe Stress Based On ASME B31.3." TEKNIK 42, no. 1 (May 3, 2021): 63–70. http://dx.doi.org/10.14710/teknik.v42i1.29244.

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Thepiping system is a medium used to convey, distribute, mix, separate, discharge, meter, control or snub fluid flows, and transmit a fluid pressure. The piping system design will have stresses due to thermal and pressure effect. The thermal effect induce pipe expansion. The pipe expansion affect to pipe flexibility, so it is necessary to design an expansion loop. Expansion loop is a method used to increase flexibility in piping systems. This article aims to analyze symmetrical and non-symmetrical in vertical expansion loops whether it can increase flexibility and reduce pipe stress. This article conducts an expansion loop design with 3 trials, namely trial 1 (Vertical Expansion Loop), trial 2 (Nonsymmetrical Vertical Expansion Loop 1), and trial 3 (Nonsymmetrical Vertical Expansion Loop 2). The three trials were compared for flexibility and stress values based on ASME B31.3 requirements. The study results show that all trial 1, trial 2, and trial 3 have good flexibility with a value of 0.00016 because not exceed the requirements of ASME B31.3. The highest design code stress value in trial 1 is 5955 psi (Node A07F), trial 2 is 5906 psi (Node A05F), and trial 3 is 5906 psi (Node A06N). All trials have a code stress not exceeding the allowable stress (20000 psi). So that the symmetrical or nonsymmetrical design of the vertical expansion loop can both increase flexibility and reduce pipe stress.

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Journal articles on the topic 'Reducera stress'

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