Thermal stability of lubricants in cycloidal reducers

Vasić, Milan; Blagojević, M; Dragoi, Mircea

doi:10.5937/engtoday2202007v

Cited by 4 publications

(2 citation statements)

References 14 publications

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“…In recent decades, these reducers have been the subject of intensive research. Researchers have dealt with dynamic load analysis [16][17][18], stressstrain analysis [19,20], determination of efficiency [21,22], thermal analysis [23,24] and with many other issues.…”

Section: Introductionmentioning

confidence: 99%

Model for Evaluating the Plasma Coating Method

Кравченко¹,

Kuznetsov²,

Velichko³

et al. 2023

adeletters

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The article considers the main prospects for the use of the method of coating plasma spraying. The essence of plasma spraying is disclosed, and the main advantages and disadvantages of this coating formation method are indicated. The method is characterized by high productivity and the possibility of forming high-quality coatings on machine parts for various functional purposes. It was found that the low stability of the spraying process, the structural complexity of the plasmatron and the need for mathematical modeling are constraining factors in designing new technological processes of plasma spraying. The possibility of further increasing the efficiency of plasma spraying by developing methods and means of automation and computerization of the spraying process is substantiated. Obtaining the required physical and mechanical properties of coatings applied to worn working surfaces of machine parts by plasma spraying is achieved by using modern electronic computing machines in the development of technological application processes. Based on the research a mathematical model for evaluating the method of plasma coating deposition was obtained. It allows the choice of applied materials and technological processes, as well as modeling options of design and technology solutions that meet the optimization condition. The data obtained from the results of studies allow evaluation of the impact of technological modes of coating formation on the optimization parameter.

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Section: Introductionmentioning

confidence: 99%

Model for Evaluating the Plasma Coating Method

Кравченко¹,

Kuznetsov²,

Velichko³

et al. 2023

adeletters

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“…Studies in the field of cycloidal gearbox engineering deal with the subject of design issues [7][8][9][10][11][12][13], finite element analysis of the cycloidal gearbox parts [7,[13][14][15][16][17], kinematical analysis [16,18], applications in robotics [12,16,17,19], friction, lubrication and machining [20][21][22][23][24], measurements [25], efficiency [26,27], optimisation [8,28], contact modelling [29][30][31][32], backlash and design tolerances [9,30,[33][34][35] or vibration and dynamics [31,32,[36][37][38][39][40].…”

Section: Introductionmentioning

confidence: 99%

Multibody Dynamics Model of the Cycloidal Gearbox, Implemented in Fortran for Analysis of Dynamic Parameters Influenced by the Backlash as a Design Tolerance

Król

2023

Acta Mechanica Et Automatica

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In this study, dynamical parameters of the cycloidal gearbox working at the constant angular velocity of the input shaft were investigated in the multibody dynamics 2D model implemented in the Fortran programming language. Time courses of input and output torques and forces acting on the internal and external sleeves have been shown as a function of the contact modelling parameters and backlash. The analysis results in the model implemented in Fortran were compared with the results in the 3D model designed using MSC Adams software. The values of contact forces are similar in both models. However, in the time courses obtained in MSC Adams there are numerical singularities in the form of peaks reaching 500 N for the forces at external sleeves and 400 N for the forces acting at internal sleeves, whereas in the Fortran model, there are fewer singularities and the maximum values of contact forces at internal and external sleeves do not exceed 200 N. The contact damping and discretisation level (the number of discrete contact points on the cycloidal wheels) significantly affect the accuracy of the results. The accuracy of computations improves when contact damping and discretisation are high. The disadvantage of the high discretization is the extended analysis time. High backlash values lead to a rise in contact forces and a decrease in the force acting time. The model implemented in Fortran gives a fast solution and performs well in the gearbox optimisation process. A reduction of cycloidal wheel discretisation to 600 points, which still allows satisfactory analysis, could reduce the solution time to 4 min, corresponding to an analysis time of 0.6 s with an angular velocity of the input shaft of 52.34 rad/s (500 RPM).

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An improved transmission efficiency prediction method for nonlinear characteristics of the cycloid reducer

Wang,

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part C:

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This study aims to accurately predict the nonlinear characteristics of transmission efficiency of cycloid reducers under different operating conditions. Firstly, equivalent modeling of the multi-source errors (MSEs) in the designed cycloid reducer is conducted. Force analysis algorithms considering MSEs are proposed for the cycloid drive mechanism, the output mechanism, and the bearings. Secondly, mathematical models are established for the load-dependent power losses, while an equivalent test is used for modeling load-independent power losses. Subsequently, an improved transmission efficiency prediction (TEP) method for cycloid reducers is proposed, which is then applied to the performance prediction of a prototype under different operating conditions. The advantages of the improved TEP method over the conventional method are discussed, and the influences of MSEs and load-independent power losses on the nonlinear characteristics of transmission efficiency are summarized. Finally, tests are conducted for the reducer prototype, and the test results are found to be in good agreement with the results obtained by the proposed TEP method. The main contribution of this study is to establish a solid algorithmic and modeling foundation for the optimal design of nonlinear transmission efficiency in cycloid reducers and provide reliable guidance for their engineering applications.

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Thermal stability of lubricants in cycloidal reducers

Cited by 4 publications

References 14 publications

Model for Evaluating the Plasma Coating Method

Model for Evaluating the Plasma Coating Method

Multibody Dynamics Model of the Cycloidal Gearbox, Implemented in Fortran for Analysis of Dynamic Parameters Influenced by the Backlash as a Design Tolerance

An improved transmission efficiency prediction method for nonlinear characteristics of the cycloid reducer

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