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Journal articles on the topic 'External Gear Machine'

Author: Grafiati

Published: 4 June 2021

Last updated: 30 January 2023

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1

Sakaridis, Emmanouil S., Georgios D. Ntourmas, Stavros D. Athanasopoulos, and Angelos P. Markopoulos. "A mathematically assisted methodology for the experimental calculation of the internal gear ratios to extend the lifecycle of a hobbing machine." International Journal of Mechanical Engineering Education 46, no. 1 (2017): 50–63. http://dx.doi.org/10.1177/0306419017715425.

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Manufacturing of gears can be achieved with various methods, including the cutting of gears in a hobbing machine. The function of such a machine tool is based on a combination of timing gears which synchronize all moving components accurately. Variations in the synchronization, which alter the geometric features of the gear being cut, are achieved via external gearboxes with interchangeable gears. Thus, precise knowledge of the change gears that correspond to the desired gear geometry is essential in order to operate the machine tool properly. The hobbing machine examined in this paper had rem

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2

Li, Ke, Bo Yu, Zhaoyao Shi, Zanhui Shu, and Rui Li. "Development of gear dynamic performance testing machine." International Journal of Metrology and Quality Engineering 12 (2021): 20. http://dx.doi.org/10.1051/ijmqe/2021017.

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With the development of gears towards high temperature, high pressure, high speed and high stress, gear measurement, in which only the static geometric accuracy is considered, is unable to meet the current application requirements. While, the low precision and single function gear tester constrains the measurement of gear dynamic performance. For the resolution of this problem, based on the principle of gear system dynamics and several precision mechanical design techniques, a gear dynamic testing machine has been developed, providing new instruments for gear testing. On the basis of research

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3

Manring, Noah D., and Suresh B. Kasaragadda. "The Theoretical Flow Ripple of an External Gear Pump." Journal of Dynamic Systems, Measurement, and Control 125, no. 3 (2003): 396–404. http://dx.doi.org/10.1115/1.1592193.

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In this paper, the theoretical flow ripple of an external gear pump is studied for pumps of similar size using different numbers of teeth on the driving and driven gears. In this work, the flow ripple equation is derived based upon the flow of incompressible fluid across the changing boundaries of a control volume. From this method, it is shown that the instantaneous length of action within the gear mesh determines the instantaneous flow ripple. A numerical and a closed-form approximation are presented for the instantaneous length of action and it is shown that the difference between these two

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4

Kurokawa, Syuhei, Yuuki Utsunomiya, Terutake Hayashi, Tetsuya Taguchi, and Ryota Matsuoka. "Whole outline scanning measurement of internal gear by using CNC gear measuring machine." MATEC Web of Conferences 287 (2019): 08001. http://dx.doi.org/10.1051/matecconf/201928708001.

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A three-dimensional probe is mounted on a specialized gear measuring machine whose measurement target is limited on the working flanks. The newly developed measuring machine has a coordinate measuring mechanism, aiming to be a highly versatile and relatively inexpensive measuring machine. According to our previous research, in addition to the working tooth surface, shape data of the root, bottom and tip profiles can be acquired with a single measurement operation. However, the target object for which this developed method has been applied was only the external cylindrical gear. In this paper,

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5

Yujing, Zhang, Meng Zhuo, and Sun Yize. "Dynamic Modeling and Chaotic Analysis of Gear Transmission System in a Braiding Machine with or without Random Perturbation." Shock and Vibration 2016 (2016): 1–12. http://dx.doi.org/10.1155/2016/8457645.

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This paper is aimed at analyzing the dynamic behavior of the gear transmission system in a braiding machine. In order to observe the nonlinear phenomenon and reveal the time-varying gear meshing mechanism, a mathematical model with five degrees-of-freedom gear system under internal and external random disturbance of gear system is established. With this model, bifurcation diagrams, Poincare maps, phase diagrams, power spectrum, time-process diagrams, and Lyapunov exponents are used to identify the chaotic status. Meanwhile, by these analytical methods, spur gear pair with or without random per

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6

Liu, Zhitao, Qian Tang, Xianguang Li, Zheng Zou, and Yong Yang. "A method for thermal characteristics modelling of hob assembly on dry hobbing machine." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 233, no. 7 (2018): 2262–74. http://dx.doi.org/10.1177/0954406218784619.

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Gear hobbing is the use of machinery to manufacture external gears. With the booming motor industry, there are more requirements for gear hobbing accuracy than ever before. Thermal error – as a major source of error in a dry hobbing machine – must be effectively compensated to achieve accuracy. Thus, studies on the thermal error of hob assembly are important both in theory and practice. This paper discusses the development of a valid numerical modelling method for the hob assembly of a dry hobbing machine. The equations used to determine the values of heat sources and heat transfer coefficient

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7

Wu, Yu Ren, and Van The Tran. "Lead Crowning and Anti-Twist for Tooth Flank of a Heat Treated Helical Gear on Internal CNC Honing Machine." Applied Mechanics and Materials 799-800 (October 2015): 554–59. http://dx.doi.org/10.4028/www.scientific.net/amm.799-800.554.

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The internal gear honing is more popular than the external gear honing by its advantages such as higher contact surface and easier correct profile errors. It is usually applied for modifying the gear surface to compensate for the distortions after heat treatment process. However, the lead crowning and anti-twist tooth flank of a helical gear on internal CNC gear honing has not studied yet. Therefore, a novel method for lead crowning tooth flank of work gear surfaces is proposed by using a linear swivel angle function of the honing wheel and a variable pressure angle (VPA) honing wheel is also

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8

Ohrimenko, Oleksandr, Oleksandr Oleksandrovych Klochko, Olena Volodimirivna Naboka, Alexandr Sergeevich Strіlec, and Volodymyr Ivanovych Gorbulyk. "EXPANDING THE TECHNOLOGICAL CAPABILITIES OF MACHINES FOR CUTTING BEVERED WHEELS WITH CIRCULAR TOOTH WITH INCREASED OUTER TONE DISTANCE." Bulletin of the National technical university "Kharkiv Polytechnic Institute" Series: Techniques in a machine industry, no. 1 (July 28, 2022): 74–79. http://dx.doi.org/10.20998/2079-004x.2022.1(5).10.

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Considered in the article. expansion of technological capabilities of machine tools mod. 528С for cutting bevel gears with a circular tooth with an increased outer taper distance of the gears with a crossing angle of 300. Optimizing programs are analyzed to determine the geometric parameters with obtaining the localization of the contact zone in height, for the tooth shape III, even on a machine tool without tilting the tool, and in the presence of a machine with the inclination of the tool spindle, widely apply the double-double-sided cutting method for a wide range of bevel and hypoid gears,

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9

Opperwall, Timothy, and Andrea Vacca. "A combined FEM/BEM model and experimental investigation into the effects of fluid-borne noise sources on the air-borne noise generated by hydraulic pumps and motors." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 228, no. 3 (2013): 457–71. http://dx.doi.org/10.1177/0954406213486591.

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A common assumption about fluid power systems is that the outlet pressure ripple is a primary source for air-borne noise. Fluid pressure fluctuations are caused by flow ripples generated by positive displacement units that are the prime power movers in these systems. The present research aims to leverage previous efforts in the topic of noise generation in hydrostatic units, formulating a method to predict air-borne noise for a particular reference machine. A numerical model has been developed to gain knowledge on the mechanisms of noise generation in external gear machines. The simulated nois

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10

Luo, Chun-lei, Xin Mo, Jin-yang Li, Zhi-qing Tang, and Song-song Huang. "Coupling Synchronization Criterion of Two Hydraulic Motors in an Eccentric Rotary Vibration Machine." Shock and Vibration 2019 (January 20, 2019): 1–11. http://dx.doi.org/10.1155/2019/6086874.

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In an eccentric rotating system driven by two hydraulic motors without synchronous gears, vibration coupling may help render motion stable. In order to investigate how vibration coupling influences the motion, the coupling characteristics of the vibration system were studied regarding the differences between two motors such as leakage network, coulomb damping network, and pressure loss network, and the sensitivity of the influence factors was also studied. The influence of tiny differences between the two motors, tiny differences in the motion pair structure, in the oil temperature and in the

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11

Lee, Geon-Hui, Ugochukwu Ejike Akpudo, and Jang-Wook Hur. "FMECA and MFCC-Based Early Wear Detection in Gear Pumps in Cost-Aware Monitoring Systems." Electronics 10, no. 23 (2021): 2939. http://dx.doi.org/10.3390/electronics10232939.

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Gear pump failures in industrial settings are common due to their exposure to uneven high-pressure outputs within short time periods of machine operation and uncertainty. Improving the field and line clam are considered as the solutions for these failures, yet they are quite insufficient for optimal reliability. This research, therefore, suggests a method for early wear detection in gear pumps following an extensive failure modes, effects, and criticality analysis (FMECA) of an AP3.5/100 external gear pump manufactured by BESCO. To replicate this condition, fine particles of iron oxide (Fe2O3)

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12

Barka, Noureddine, Abderrazak El Ouafi, Ahmed Chebak, Philippe Bocher, and Jean Brousseau. "Study of Induction Heating Process Applied to Internal Gear Using 3D Model." Applied Mechanics and Materials 232 (November 2012): 730–35. http://dx.doi.org/10.4028/www.scientific.net/amm.232.730.

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The current paper is principally dedicated to the study of geometry and frequency effects for internal spur gears heated by induction. The overall work is realized by the simulation efforts performed on Comsol multi-physics software. The 3D model used during this study is built basing on coupling between Maxwell’s and heat transfer equations. This model is used to calculate the temperature profile in the gear in function of machine parameters. The module and the frequency are varied to determinate their effects. In fact, two gears having the same external diameter but different modules are exp

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13

Zhang, Rui, and Yimin Zhang. "Dynamic characteristics for coal shearer cutting unit gearbox housing." Mechanics & Industry 21, no. 2 (2020): 211. http://dx.doi.org/10.1051/meca/2020008.

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Long wall mining is most widely used in coal mining of China, and coal shearer is the most important machine due to its direct role in cutting coal. Nevertheless, coal mining enterprises are suffering from faults of coal shearer, especially cutting unit gearbox housing (CUGH). Published dynamic studies on CUGH have not considered the excitation caused by gear meshing and complete machine vibration. Due to the apparent lack of experimental validation of these published papers, the dynamic response of CUGH is not convincing. In this study, dynamic behavior of CUGH is investigated both theoretica

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14

Torrent, Miquel, Pedro Javier Gamez-Montero, and Esteban Codina. "Parameterization, Modeling, and Validation in Real Conditions of an External Gear Pump." Sustainability 13, no. 6 (2021): 3089. http://dx.doi.org/10.3390/su13063089.

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This article presents a methodology for predicting the fluid dynamic behavior of a gear pump over its operating range. Complete pump parameterization was carried out through standard tests, and these parameters were used to create a bond graph model to simulate the behavior of the unit. This model was experimentally validated under working conditions in field tests. To carry this out, the pump was used to drive the auxiliary movements of a drilling machine, and the experimental data were compared with a simulation of the volumetric behavior under the same conditions. This paper aims to describ

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15

Torrent, Miquel, Pedro Javier Gamez-Montero, and Esteban Codina. "Model of the Floating Bearing Bushing Movement in an External Gear Pump and the Relation to Its Parameterization." Energies 14, no. 24 (2021): 8553. http://dx.doi.org/10.3390/en14248553.

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This article presents the modeling, simulation and experimental validation of the movement of the floating bearing bushing in an external gear pump. As a starting point, a complete pump parameterization was carried out through standard tests, and these parameters were used in a first bond graph model in order to simulate the gear pump behavior. This model was experimentally validated under working conditions in field tests. Then, a sophisticated bond graph model of the movement of the floating bushing was developed from the equations that define its lubrication. Finally, as a result, both mode

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16

Phokane, Thobi, Kapil Gupta, and Munish Kumar Gupta. "Investigations on surface roughness and tribology of miniature brass gears manufactured by abrasive water jet machining." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 232, no. 22 (2017): 4193–202. http://dx.doi.org/10.1177/0954406217747913.

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Surface roughness parameters are important indicators for determining the operating performance, tribology behavior, wear and tear characteristics, and service life of engineered parts including gears. This article presents the investigation on surface roughness, and tribology and wear aspects of miniature brass gears manufactured by abrasive water jet machining. Experiments have been conducted based on Taguchi's robust design technique with L9 orthogonal array to machine external spur-type miniature gears of brass having 8.4 mm pitch diameter, 12 teeth, and 5 mm thickness. The effect of three

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17

Wu, Yu-Ren, and Van-The Tran. "Transmission and load analysis for a crowned helical gear pair with twist-free tooth flanks generated by an external gear honing machine." Mechanism and Machine Theory 98 (April 2016): 36–47. http://dx.doi.org/10.1016/j.mechmachtheory.2015.11.014.

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18

Xia, Yan, Yi Wan, Hongwei Wang, and Zhanqiang Liu. "Dynamic characteristics analysis of locomotive traction gear pair system under internal and external excitations." Engineering Computations 37, no. 8 (2020): 2587–617. http://dx.doi.org/10.1108/ec-03-2019-0083.

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Purpose As the transmission component of a locomotive, the traction gear pair system has a direct effect on the stability and reliability of the whole machine. This paper aims to provide a detailed dynamic analysis for the traction system under internal and external excitations by numerical simulation. Design/methodology/approach A non-linear dynamic model of locomotive traction gear pair system is proposed, where the comprehensive time-varying meshing stiffness is obtained through the Ishikawa formula method and verified by the energy method, and then the sliding friction excitation is analyz

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19

Huang, Tao, Yaming Guo, Bo Lu, et al. "Finite Element Analysis and Forming Test of Roll Forging of Thin - wall Inner and Outer Gear Cup." Journal of Physics: Conference Series 2239, no. 1 (2022): 012013. http://dx.doi.org/10.1088/1742-6596/2239/1/012013.

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Abstract In this paper, a new forming process method for cup-shaped parts with internal and external teeth structure is proposed, and the forming principle is expounded. The forming characteristics of cup-shaped parts with internal and external teeth are analyzed by finite element method. The stress and strain distribution in different regions of internal teeth, external teeth and side wall are studied. The most prone areas of defects are predicted. The process parameters are determined by simulation. The sample trial production is completed on GD 62-380 roll forging machine, and the comprehen

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20

Antoniadis, A., N. Vidakis, and N. Bilalis. "Fatigue Fracture Investigation of Cemented Carbide Tools in Gear Hobbing, Part 1: FEM Modeling of Fly Hobbing and Computational Interpretation of Experimental Results." Journal of Manufacturing Science and Engineering 124, no. 4 (2002): 784–91. http://dx.doi.org/10.1115/1.1511172.

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Gear hobbing is a highly utilized flexible manufacturing process for massive production of external gears. However, the complex geometry of cutting hobs is responsible for the almost exclusive utilization of high-speed steel (HSS) as cutting tool material. The limited cutting performance of HSS, even coated HSS, restricts the application of high cutting speeds and restricts the full exploitation of modern CNC hobbing machine tools. The application of cemented carbide tools was considered as a potential alternative to modern production requirements. In former investigations an experimental vari

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21

Sepehri, N., F. Sassani, P. D. Lawrence, and A. Ghasempoor. "Simulation and Experimental Studies of Gear Backlash and Stick-Slip Friction in Hydraulic Excavator Swing Motion." Journal of Dynamic Systems, Measurement, and Control 118, no. 3 (1996): 463–67. http://dx.doi.org/10.1115/1.2801168.

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Inherent to any heavy-duty hydraulic machine operation with a large number of interconnected components are nonidealities such as gear backlash, friction and leakage. The swing motion of the operator’s cabin in an excavator is a typical example. In this paper we conduct a study comprising experimental, mathematical and simulation components to determine the degree to which these nonlinearities affect the performance of such machines. The inclusion of the conventional model of backlash in the simulation of the excavator swing motion is shown to be inefficient and unnecessary in terms of computa

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22

Thiagarajan, Divya, Sujan Dhar, and Andrea Vacca. "A Novel Fluid Structure Interaction-EHD Model and Optimization Procedure for an Asymmetrical Axially Balanced External Gear Machine." Tribology Transactions 58, no. 2 (2015): 274–87. http://dx.doi.org/10.1080/10402004.2014.968697.

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23

Kambulov, S. I., V. B. Rykov, I. V. Bozhko, and V. V. Kolesnik. "Running gear of machine-tractor units and their influence on the quality of performed operations." Traktory i sel hozmashiny 84, no. 11 (2017): 15–20. http://dx.doi.org/10.17816/0321-4443-66330.

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The machine-tractor unit is a key element in an implementation of technological operations in the cropping. Running gears with wheeled and caterpillar propulsion device are used in the modern tractors. During an interaction of the ground with tractor propulsion devices, the ground is pulverized on one side and it is compacted on the other side during the slipping. Besides, the wheeled movers have the slipping several times higher than caterpillar movers. The aim of the research is an analysis of running gears of machine-tractor units and their influence on the quality of performed technologica

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24

Németh, Géza, and József Péter. "Development of Efficient Drive Based on Self-help." International Journal of Engineering and Management Sciences 4, no. 1 (2019): 147–51. http://dx.doi.org/10.21791/ijems.2019.1.18.

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The efficiency and the life rating are essential characteristics of mechanical drives. The traction drives with proper geometry can avoid the geometrical slip and their efficiency can exceed that of the gear drives. The elements has hardened steel surfaces, the lubricant is rheopectic. There is no danger for thinning the oil film and consequently for connecting the asperities. The traction drives are relatively noiseless, they are applicable for increasing speed in particular. There are some problems to be solved in friction drive. This is the necessity of clamping force. A simple machine elem

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25

Barka, Noureddine, Abdel Jelil Khelalfa, Abderrazak El Ouafi, Philippe Bocher, and Jean Brousseau. "Effect of Skin Depth on Hardness Profile of Gear Heated by Induction Using 2D Model." Advanced Materials Research 664 (February 2013): 884–90. http://dx.doi.org/10.4028/www.scientific.net/amr.664.884.

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This work is carried principally by simulation efforts using computer-modeling software (COMSOL). The developed 2D model includes the coupling between electromagnetic and thermal fields, and takes account of the nonlinear behaviour of material properties versus temperature. Several steps were followed to reach this goal. First, a 2D finite element model of a gear was developed in order to simulate the induced currents density and temperature distributions for various frequencies and external currents applied in the coil. Second, the temperature profiles were compared using the ratio between th

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26

Lou, Bin Chao. "W722 Lathe of Fault Detection and Diagnosis." Advanced Materials Research 328-330 (September 2011): 672–76. http://dx.doi.org/10.4028/www.scientific.net/amr.328-330.672.

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Shanghai YinChaoChang a W722 lathe processing of metal parts, workpiece surface machining quality external circular no obvious problem, and the machine's vibration is small. But in the processing of main parts - rubber managers stamped drum, workpiece surface appear periodically outside round the chatter marks, general examination of hard to find the failure causes of machine tools. We adopt mechanical fault diagnosis technology to find fault location and fault machine of the machine, first nature of transmission chain of analysis and calculation, obtains each train parts, use characteristic f

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27

Shao, Xuedong, Bowen Zheng, Zhenhao Luo, and Zhenghe Song. "Establishment and Validation of a Structural Dynamics Model with Power Take-Off Driveline for Agricultural Tractors." Agriculture 12, no. 9 (2022): 1297. http://dx.doi.org/10.3390/agriculture12091297.

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As off-road vehicles, in addition to field transportation, another vital function of agricultural tractors is to provide power for field machinery. Therefore, the dynamic performance of the power take-off (PTO) driveline directly affects the field reliability of tractors. Firstly, a torsional vibration coupled spatial dynamics model of the power take-off driveline is proposed according to the classical machine driveline dynamics and gear dynamics theory. In the dynamics model, the interactions among the vertical, lateral, and rotational motions of the driveline parts are fully included. The co

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28

Kalashnikov, Aleksandr S., Yuriy A. Morgunov, and Pavel A. Kalashnikov. "Hobbing of Cylindrical Wheels without Coolants." Materials Science Forum 973 (November 2019): 139–44. http://dx.doi.org/10.4028/www.scientific.net/msf.973.139.

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This article studies dry hobbing of external cylindrical wheels by worm wheel hobs and reasons why some gear manufactures use hobbing without cutting fluids. Cutting fluids reduce frictional wear, provides temperature cooling of the tool or workpiece and helps flush away the chips from the cutting zone. But uneven cooling and different cutting conditions on the engaging and disengaging sides of a gear mesh provoke intensive wear of the teeth of the worm wheel hob, thus decreasing the life of worm hobs and increasing both the consumption of cutting tools and expenses for them. In this context,

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29

Kazakov, Yu, V. Batmanov, V. Pavlov, and V. Medvedev. "Wheel drive with integrated differential." IOP Conference Series: Earth and Environmental Science 935, no. 1 (2021): 012029. http://dx.doi.org/10.1088/1755-1315/935/1/012029.

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Abstract The performance indicators of wheeled arable machine-tractor units, which are accelerated on the working gear, depend on the operating modes of the wheels during this period. When the wheel is skidding, soil lumps break down in the contact spot, the soil structure is destroyed. Based on the system analysis of the wheels operation, the method of their improvement is justified by continuous control of the eccentric point of application of the driving torque and external load. As a result of the analysis for the first time, a soil-sparing wheel mover with the properties of a differential

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30

Sun, Wei, Maolin Shi, Jieling Li, Xin Ding, Lintao Wang, and Xueguan Song. "Surrogate-Based Multisource Sensitivity Analysis of TBM Driving System." Shock and Vibration 2018 (July 3, 2018): 1–14. http://dx.doi.org/10.1155/2018/5187535.

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TBM cutterhead driving system is generally an extraordinarily large and complex machine containing lots of parameters; understanding and assessment of its dynamic characteristics are a great challenge as each of these parameters has uncertainty. In this work, a hierarchical modeling method for the dynamic model of the complex gear transmission system is proposed based on the generalized finite element modeling idea. On this basis, the whole machine dynamic model of cutterhead driving system is established; both the characteristics of vibration responses and the meshing force are revealed. Vibr

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31

Yang, Yang, Yuquan Mi, Datong Qin, Aihui Yuan, and Guowei Li. "Analysis of the characteristics of electromechanical-hydraulic model of multi-source drive/transmission system based on periodic excitation." Advances in Mechanical Engineering 11, no. 1 (2019): 168781401881712. http://dx.doi.org/10.1177/1687814018817128.

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Multi-source drive system with the feature of compact, small size and other advantages is widely used in large engineering machinery, such as shield machine, wind turbines, and shearer. In this article, a reasonable power transmission form is designed and the electromechanical-hydraulic coupling model of the multi-source drive system including the hydraulic pump-motor lumped parameter model and gear system dynamics model is established based on the co-simulation of MATLAB and AMEsim. Taking the pump flow pulsation and the time-varying meshing stiffness as the external and internal excitation o

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Lindsley, N., J. Medzorian, and J. Padovan. "Experimental Results and Analysis of Aircraft Tire-Test Drum Interaction." Tire Science and Technology 25, no. 1 (1997): 43–62. http://dx.doi.org/10.2346/1.2137531.

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Abstract Although aircraft tires are traditionally tested on external drum dynamometers, the effects of the curvature of the test surface on the normal contact pressure distribution and footprint area of an aircraft tire have not previously been addressed. Using the tire force machine (TFM) at the Wright Laboratory Landing Gear Development Facility (LGDF), trends in tire footprint area and normal contact pressure distributions were investigated for concave, flat, and convex surfaces. This evaluation was performed using the F-16 radial (25.5×8.0 14PR) main landing gear tire at rated load (16,20

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Jin, Lihong, Junpeng Shao, Xigui Wang, Yongmei Wang, and Baixue Fu. "Vibroacoustic characteristics analysis of a planetary gear reducer considering the exterior housing structure." Mechanical Sciences 12, no. 1 (2021): 539–57. http://dx.doi.org/10.5194/ms-12-539-2021.

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Abstract. Previous studies have attempted to identify weak links in the dynamic characteristics of the planetary gear reducer (PGR) exterior body structure (EBS). Through numerical simulation, these studies analyzed the mode and natural frequencies and the vibration types of each order of the EBS. However, these scholars have never focused on the main factors affecting the dynamic characteristics of the EBS of this subject. This study in the topic has analyzed the vibroacoustic characteristics of an EBS and optimized its design using numerical simulation. Herein, the contribution of the vibrat

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Chang, Jingru, Dong Yu, Zheng Zhou, Wuwei He, and Lipeng Zhang. "Hierarchical Reinforcement Learning for Multi-Objective Real-Time Flexible Scheduling in a Smart Shop Floor." Machines 10, no. 12 (2022): 1195. http://dx.doi.org/10.3390/machines10121195.

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With the development of intelligent manufacturing, machine tools are considered the “mothership” of the equipment manufacturing industry, and the associated processing workshops are becoming more high-end, flexible, intelligent, and green. As the core of manufacturing management in a smart shop floor, research into the multi-objective dynamic flexible job shop scheduling problem (MODFJSP) focuses on optimizing scheduling decisions in real time according to changes in the production environment. In this paper, hierarchical reinforcement learning (HRL) is proposed to solve the MODFJSP considerin

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35

Shah, Yash, Andrea Vacca, and Sadegh Dabiri. "Air Release and Cavitation Modeling with a Lumped Parameter Approach Based on the Rayleigh–Plesset Equation: The Case of an External Gear Pump." Energies 11, no. 12 (2018): 3472. http://dx.doi.org/10.3390/en11123472.

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In this paper, a novel approach for the simulation of cavitation and aeration in hydraulic systems using the lumped parameter method is presented. The presented approach called the Hybrid Rayleigh–Plesset Equation model is derived from the Rayleigh–Plesset Equation representative of bubble dynamics and overcomes several shortcomings present in existing lumped parameter based cavitation modeling approaches. Models based on static approximations do not consider the non-equilibrium effects of phase change on the system and incorrectly predict the system dynamics. On the other hand, the existing d

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36

Sanchugov, V. I., and P. D. Rekadze. "Determination of the dynamic characteristics of a gear pump by the load variation method using special bench systems." Advanced Engineering Research 22, no. 2 (2022): 130–41. http://dx.doi.org/10.23947/2687-1653-2022-22-2-130-141.

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Introduction. Some of the major factors in the occurrence of vibration of units, causing fatigue failure of the housings of elements, pipelines, and failure of pump elements, are pulsations of the working medium in the hydraulic systems of machine tools, fuel feed systems of aircraft engines and liquid-propellant engine supply. This study aimed at the implementation of a method for determining the dynamic characteristics of a volumetric pump using special bench systems, and the comparison of the calculation results to the experimental data. The stages of calculating the dynamic characteristics

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Polowy, Krzysztof, and Marta Molińska-Glura. "Data Mining in the Analysis of Tree Harvester Performance Based on Automatically Collected Data." Forests 14, no. 1 (2023): 165. http://dx.doi.org/10.3390/f14010165.

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Data recorded automatically by harvesters are a promising and potentially very useful source of information for scientific analyses. Most researchers have used StanForD files for this purpose, but these are troublesome to obtain and require some pre-processing. This study utilized a new source of similar data: JDLink, a cloud-based service, run by the machine manufacturer, that stores data from sensors in real time. The vast amount of such data makes it hard to comprehend and handle efficiently. Data mining techniques assist in finding trends and patterns in such databases. Records from two mi

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Kalkat, Menderes. "Investigations on the effect of oil quality on gearboxes using neural network predictors." Industrial Lubrication and Tribology 67, no. 2 (2015): 99–109. http://dx.doi.org/10.1108/ilt-02-2013-0020.

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Purpose – The purpose of this paper was to perform an experimental investigation to analyze vibration and noise of unloaded gearbox with different oil quality. All motor-driven machinery used in the modern world can develop faults. The maintenance plans include analyzing the external relevant information of critical components, in order to evaluate its internal state. From the beginning of the twentieth century, different technologies have been used to process signals of dynamical systems. Design/methodology/approach – A proposed neural network (NN) is also employed to predict vibration parame

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Opel, Simon, Thomas Schneider, and Marion Merklein. "Manufacturing of Geared Sheet Metal Components Using Flexible Rolled Tailored Blanks." Key Engineering Materials 554-557 (June 2013): 1459–70. http://dx.doi.org/10.4028/www.scientific.net/kem.554-557.1459.

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Manufacturing of functional sheet metal products with integrated gear teeth by form-ing can be realised with the application of bulk forming operations on sheet metals. Due to the desired part geometry simultaneous 2D and 3D stress and strain states occur during the forming operations. The main challenges of sheet-bulk metal form-ing are high resulting forming forces and the demand on a specific control of the material flow. In addition, there is a distinctive interaction between blank thickness and resulting part quality. To meet these challenges at high material efficiency, the application o

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Yu, Tao, Yu Xia Qian, Ke Dong, and Su Yu Wang. "Improving the Precision of Gear Honing with External Honing Ring Using Diamond Dressing Gear." Advanced Materials Research 135 (October 2010): 111–15. http://dx.doi.org/10.4028/www.scientific.net/amr.135.111.

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The gear honing process is a widely used process for gear finishing after heat-treated, and may be divided into the variants “internal-tooth honing” and “external-tooth honing”. External- tooth honing is seldom used in gear finishing due to lower overlapping ratio and relatively low precision. But its process cost is much lower than internal-tooth honing and gear grinding. The paper puts forward a new method to improve the precision of external-tooth honing, i.e. honing ring is profiled by diamond dressing gears, which have the profile of the workpiece to be machined. Meshing and Tooth contact

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Svahn, Mattias. "A parametric analysis of the surface roughness of teeth shaped by a pinion shaper cutter and guidelines for choosing process parameters." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 233, no. 21-22 (2019): 7368–77. http://dx.doi.org/10.1177/0954406219843951.

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A parametric mathematical model is presented, by which it is possible to determine the machined gear tooth surface topography cut by a pinion shaper cutter. Arbitrary internal or external helical gears designs can be considered, the gear and the shaper cutter must only share a basic rack design. The basic rack has here an elliptical fillet, as it allows fewer tool tooth numbers without the risk of undercut. The machined tooth surface is presented in three dimensions and by surface roughness parameters [Formula: see text], and [Formula: see text]. A novel method to choose cutting parameters and

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Prikhod’ko, A. A. "KINETOSTATIC ANALYSIS OF DOUBLE-SATELLITE PLANETARY MECHANISM WITH ELLIPTICAL GEARWHEELS." Spravochnik. Inzhenernyi zhurnal, no. 278 (May 2020): 33–39. http://dx.doi.org/10.14489/hb.2020.05.pp.033-039.

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Non-circular gears can be used in modern machines and mechanisms for the implementation of various types of output link movement and have high strength and compactness compared to linkage mechanisms. The article considers the problem of kinetostatic analysis of the planetary mechanism, which provides the rotationally reciprocating motion of the stirred tank impeller. Proposed mechanism is a two-satellite single-row planetary gear with two external gears, in which one pair of gears is elliptical gearwheels. There are constructed calculation schemes, kinetostatic balance equations are compiled a

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Prikhod’ko, A. A. "KINETOSTATIC ANALYSIS OF DOUBLE-SATELLITE PLANETARY MECHANISM WITH ELLIPTICAL GEARWHEELS." Spravochnik. Inzhenernyi zhurnal, no. 278 (May 2020): 33–39. http://dx.doi.org/10.14489/hb.2020.05.pp.033-039.

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Non-circular gears can be used in modern machines and mechanisms for the implementation of various types of output link movement and have high strength and compactness compared to linkage mechanisms. The article considers the problem of kinetostatic analysis of the planetary mechanism, which provides the rotationally reciprocating motion of the stirred tank impeller. Proposed mechanism is a two-satellite single-row planetary gear with two external gears, in which one pair of gears is elliptical gearwheels. There are constructed calculation schemes, kinetostatic balance equations are compiled a

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Devendran, Ram Sudarsan, and Andrea Vacca. "Theoretical analysis for variable delivery flow external gear machines based on asymmetric gears." Mechanism and Machine Theory 108 (February 2017): 123–41. http://dx.doi.org/10.1016/j.mechmachtheory.2016.10.001.

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Thiagarajan, Divya, Sujan Dhar, and Andrea Vacca. "Improvement of Lubrication Performance in External Gear Machines through Micro-surface Wedged Gears." Tribology Transactions 60, no. 2 (2016): 337–48. http://dx.doi.org/10.1080/10402004.2016.1168898.

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Zhou, Zhi Gang, Da Tong Qin, Jun Yang, and Hui Tao Chen. "Study on Dynamic Characteristics of Wind Turbine Planetary Gear System Coupled with Bearing at Varying Wind Speed." Applied Mechanics and Materials 86 (August 2011): 653–57. http://dx.doi.org/10.4028/www.scientific.net/amm.86.653.

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The sparse least squares support vector machines (SL-SVM) is used to simulate wind speed of real wind field, and time-varying wind load caused by stochastic wind speed is then obtained. A coupling gear-bearing dynamical model of planetary gear transmission system of wind turbine is built using lumped-parameter method, in which the varying wind load, time-vary mesh stiffness of gear pair and time-vary stiffness of rolling element bearing are taken into account. Numerical method is used to simulate the dynamic performance of planetary gear transmission of multibrid technology wind turbine (MTWT)

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Kuo, Kei Lin. "Study on Optimal Load for Hydraulic Control System of Continuously Variable Transmission." Advanced Materials Research 516-517 (May 2012): 665–68. http://dx.doi.org/10.4028/www.scientific.net/amr.516-517.665.

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In recent years, the main research focus for vehicle transmission systems has been the development of the Continuously Variable Transmission (CVT). CVTs can provide passengers with greater comfort, reduce energy consumption, and offer better transmission efficiency. CVT systems achieve the desired gear ratio by adjusting the hydraulic pressure on the rear and front pulleys using a solenoid valve. Our study aims to increase the efficiency of an existing CVT system, without reducing its performance. In this study have modified the CVT so that we can independently control the external and interna

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Vasilescu, Mircea Dorin, and Traian Fleser. "Influence of Technological Parameters on the Dimension of GEAR Parts Generated with PLA Matherial by FDM 3D Printing." Materiale Plastice 55, no. 2 (2018): 247–51. http://dx.doi.org/10.37358/mp.18.2.5005.

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The purpose of this research is to establish the technology of 3D printable production on the principle of FDM of gears made of PLA, ABS and PETG mainly. In the paper we present first the dimensional generation and specific aspects that need to be considered to produce gears with internal or external teeth of the cylindrical type with vertical or inclined teeth. Generating the gears appeared as a necessity for the reconditioning of the components of the processing machines and of the electric machines made both in the process of elaboration of the bachelor�s and the laboratory works, with redu

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Rituraj, Rituraj, Andrea Vacca, and Mario Antonio Morselli. "Thermal Modelling of External Gear Machines and Experimental Validation." Energies 13, no. 11 (2020): 2920. http://dx.doi.org/10.3390/en13112920.

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The flow of energy within external gear machines (EGMs) leads to the variation of fluid temperature in the EGMs, which affects their performance. However, the common approaches for the simulation of EGMs assume isothermal conditions. This isothermal assumption negatively impacts their modelling accuracy in terms of the internal flows which are dependent on the fluid temperature (via fluid properties). This paper presents a lumped parameter based thermal model of EGMs where the fluid temperature in the EGM is evaluated considering the effects of compression/expansion, internal flows, and power

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Zhao, Xinran, and Andrea Vacca. "Numerical analysis of theoretical flow in external gear machines." Mechanism and Machine Theory 108 (February 2017): 41–56. http://dx.doi.org/10.1016/j.mechmachtheory.2016.10.010.

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