Studies on Neutral Gear Rattle in Early Stage Design

Bile, Yogesh; Gondhalekar, Aditya; Kumbhar, Mansinh

doi:10.4271/2013-26-0109

Cited by 9 publications

(3 citation statements)

References 10 publications

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“…In this section, the validated single tooth rattling dynamics model is used to solve the equations using the 4th order Runge-Kutta method with variable step size to obtain the bifurcation diagram and relative displacement time domain, frequency domain, phase trajectory and Poincare mapping of the system under different influencing factors, and the Jerk (derivative of force with respect to time) based rattling indicator as shown in Eq. ( 32) is selected to evaluate the parameter variation with reference to literature [33]. The effect on the rattle strength of the gear is analyzed by the forward difference method for the sensitivity of the rattle index, as shown in Eq.…”

Section: Numerical Simulations and Analysismentioning

confidence: 99%

See 1 more Smart Citation

Nonlinear characteristic analysis of gear rattle based on refined dynamic model

Dong

Ning

et al. 2022

Nonlinear Dyn

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In order to explore the vibration response and the nonlinear behavior of gear rattle, a nonlinear dynamic model is developed in this paper considering the nonlinear oil film force, timevarying meshing stiffness, dragging torque and friction and gear backlash with time-varying characteristics. The time-varying meshing stiffness is calculated using the potential energy method. Considering the convolution and extrusion of the lubricant between the teeth, it is modeled as a nonlinear spring-damped element and a nonlinear oil film force is introduced. The drag torque is calculated numerically using fluid dynamics theory, friction principle, momentum conservation principle and Bernoulli's principle. The model is verified by comparing the bench test results with the simulation results, and the parametric study is performed to investigate the nonlinear system characteristics by means of Fast Fourier Transform, Poincare map and bifurcation diagram. The results show that as the excitation frequency increases, the system enters chaotic state under multiple frequency jumps. Excessive torque fluctuation may lead to severe rattling phenomenon of the gear pair, and making the system enter a chaotic state; As the lubricant viscosity increases, the system shows periodic, bifurcation and chaotic behavior alternately, and when the viscosity is large enough, the high frequency shock intensity decays more rapidly due to large drag torque, which is beneficial to reduce the percussion strength and prevent the system into chaos.

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Section: Numerical Simulations and Analysismentioning

confidence: 99%

“…The effect on the rattle strength of the gear is analyzed by the forward difference method for the sensitivity of the rattle index, as shown in Eq. (33).…”

Section: Numerical Simulations and Analysismentioning

confidence: 99%

Nonlinear characteristic analysis of gear rattle based on refined dynamic model

Dong

Ning

et al. 2022

Nonlinear Dyn

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“…A high-contact ratio gear, helical gear, modified tooth profile and high-quality tooth surface can reduce the gear whining noise [83,90]. Minimizing the backlash and the inertia of loose parts, optimizing the synchronizer design and reducing torsional vibration from the ICE can help reduce the rattling noise [91]. Furthermore, a torsional damper, dual mass flywheel or pendulum absorber is often placed between the engine and transmission to reduce vibration and fluctuation from the ICE and thus effectively suppress the rattling noise and vibration of the gearbox.…”

Section: Nvh Technologymentioning

confidence: 99%

Progress in Automotive Transmission Technology

Dong

Liu

et al. 2018

Automot. Innov.

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Much progress has been made in the development of automotive transmissions over the past 20 years, e.g., an increased speed number, expanded ratio spread and improved efficiency and shift quality. Automotive transmissions are moving toward electrification in response to stringent legislation on emissions and the pressing demand for better fuel economy. This paper reviews progress in automotive transmission technology. Assisted by computer-aided programs, new transmission schemes are constantly being developed. We therefore first introduce the synthesis of the transmission scheme and parameter optimization. We then discuss the progress in the transmission technology of a conventional internal combustion engine vehicle in terms of new layouts; improved efficiency; noise, vibration and harshness technology; and the shifting strategy and control technology. As the major development trend, transmission electrification is subsequently discussed; this discussion includes the configuration design, energy management strategy, hybrid mode shifting control, single-speed and multi-speed electric vehicle transmission and distributed electric drive. Finally, a summary and outlook are presented for conventional automotive transmissions, hybrid transmissions and electric vehicle transmissions.

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Numerical and experimental study of gear rattle based on a refined dynamic model

Dong

Wang

et al. 2022

Applied Acoustics

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Studies on Neutral Gear Rattle in Early Stage Design

Cited by 9 publications

References 10 publications

Nonlinear characteristic analysis of gear rattle based on refined dynamic model

Nonlinear characteristic analysis of gear rattle based on refined dynamic model

Progress in Automotive Transmission Technology

Numerical and experimental study of gear rattle based on a refined dynamic model

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