Non-Newtonian Thermo-Elastohydrodynamics and Sub-Surface Stress Field of High-Performance Racing Spur Gears

Sivayogan, Gajarajan; Dolatabadi, Nader; Johns-Rahnejat, P.M.; Rahmani, Ramin; Rahnejat, Homer

doi:10.3390/lubricants10070146

Cited by 13 publications

(8 citation statements)

References 71 publications

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“…However, in this article, it is mainly reflected based on the wear coefficient K w of the Archard wear model and the relative sliding speed v of the contact surface. It is worth noting that the temperature of the contact surface will also affect the lubricant in the contact, thus affecting the friction, 43,44 but this is beyond the scope of this article. Nevertheless, the generality of the proposed model allows gear elastohydrodynamic lubrication (EHL) models, such as models containing thermal effects, to be coupled to this model.…”

Section: Numerical Simulation and Discussionmentioning

confidence: 99%

Dynamic modelling of gear–spline system with nonuniform spline clearance and wear evolution of spline

Sun

Shi

Yang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part K:

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The gear–spline system consisting of the internal spline of gears and the external spline of shafts is widely used in mechanical transmission systems. However, considering the nonuniform spline clearance caused by the assembly and manufacturing errors, the vibration characteristics of the system and the spline wear mechanism are still unclear. This article proposed a dynamic model of the gear–spline system with nonuniform spline clearance and wear evolution of spline. Compared with the existing models, the new contribution of this article is to reveal the coupling vibration mechanism of the gear–spline system under the condition of nonuniform spline clearance through the dynamic model. On this basis, the support stiffness characteristics and wear evolution law of the spline pair under the dynamic gear meshing force are studied. The results show that under the condition of nonuniform clearance, the displacement response of the system is modulated by the rotation frequency, and the motion trajectory tends to be chaotic. The load distribution of spline teeth and the equivalent stiffness of the spline depends on the number of loaded spline teeth, which in turn depends on the input torque and clearance distribution. In addition, the spline teeth with smaller clearance bear more loads and wear faster, and the wear causes the nonuniform clearance to gradually increase and become uniform. This study can provide theoretical guidance for revealing the vibration mechanism of the gear–spline system and calculating the support stiffness of the spline shaft.

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Section: Numerical Simulation and Discussionmentioning

confidence: 99%

Dynamic modelling of gear–spline system with nonuniform spline clearance and wear evolution of spline

Sun

Shi

Yang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part K:

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“…18 In the presence of lubricant, causes the meshing tooth pairs to experience a non-Newtonian state of thermoelastic lubrication. 19 At the same time, the effect of temperature can lead to an increase in friction. 20,21 According to the pumping machine maintenance engineers, the lubrication of its rack and pinion mechanism is worse, which is mainly caused by windy and sandy weather and the open operation of the rack and pinion.…”

Section: Sph-fem Coupling Model For Rack and Pinion Meshingmentioning

confidence: 99%

Meshing impact analysis of the gear and rack of the pumping machine based on the SPH–FEM coupling method

Di,

Ahmat,

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part K:

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This paper explores the feasibility of using the coupled smooth particle hydrodynamics–finite element method (SPH–FEM) to study the gear rack and meshing impact problem. Firstly, a numerical model containing both SPH and FEM units is established, and its accuracy is verified. Then, the principle of gear rack meshing impact is analyzed from the perspective of impact dynamics theory, and the formula of maximum meshing impact force is derived. Finally, the meshing impact process of the rack and pinion is simulated using the coupled SPH–FEM method, and experiments are designed to verify it. The analysis results show that the SPH–FEM coupling method can simulate the meshing impact behavior of the gear mechanism more accurately. On the other hand, the severity of the impact in each operating section was obtained. It is also found that the impact stress has reached the material's tensile limit, revealing the mechanism of tooth surface wear caused by the impact. The results of the study provide a choice of research methods for gear mechanism meshing impact and also provide some reference for gear rack tooth shape optimization.

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“…The first stage of the marine compound gear transmission system is a helical gear pair. For a single-stage spur/helical gear pair, a large number of researches have been carried out, mainly involving the tooth contact analysis (TCA) and LTCA which are also used in spiral bevel or hypoid gears, 1,2 load distribution prediction, 3,4 lubrication analysis, 5,6 tooth root stress and contact stress analysis, 7,8,9 tooth surface modification, 10,11 meshing stiffness calculation, 12,13 influence investigation of system parameters and operating conditions on vibration responses of gear system. 14–18 Besides, dynamic behaviours of multi-stage external gear transmission system have also been studied.…”

Section: Introductionmentioning

confidence: 99%

Dynamic modelling and vibration characteristics of a marine compound gear transmission system

Long

Yuan

Gong

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part K:

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The vibration level is the key index to measure the performance of marine gear transmission device. The compound gear transmission system, which is composed of a helical gear pair and a spur star gear train, is widely used in marine gear transmission device. This paper presents a multi-node dynamic model for a marine compound gear transmission system, investigating the modal properties and dynamic responses of the system. The mesh stiffness and transmission error for each gear pair are determined using the loaded tooth contact analysis (LTCA) model. The theoretical and experimental vibration acceleration responses of the gearbox housing are contrastively analysed. The results show that some vibration modes are very similar to those of a single planetary gear train, but other modes are multi-node and multi-degree of freedom coupling modes. The vibration coupling and transferring phenomenon between two stages can be observed remarkably, but those show obvious differences under different working conditions. The torsional stiffness of the elastic connecting shaft has significant influence on the vibration coupling and transferring phenomenon. The results can provide useful guidance for the low vibration and noise design of the marine compound gear transmission system.

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Non-Newtonian Thermo-Elastohydrodynamics and Sub-Surface Stress Field of High-Performance Racing Spur Gears

Cited by 13 publications

References 71 publications

Dynamic modelling of gear–spline system with nonuniform spline clearance and wear evolution of spline

Dynamic modelling of gear–spline system with nonuniform spline clearance and wear evolution of spline

Meshing impact analysis of the gear and rack of the pumping machine based on the SPH–FEM coupling method

Dynamic modelling and vibration characteristics of a marine compound gear transmission system

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