Optimization on Nonlinear Dynamics of Gear Rattle in Automotive Transmission System

Abstract

Recently, gear rattle noise is gradually becoming a nonignorable issue involving comfortableness in automotive transmission for a car. Generally, the rattle noise is influenced by nonlinear dynamic of multiple pairs of idler gears in the multistage gear transmission system. Optimization methods based on nonlinear rattle dynamic analysis are worthy of further study to control the noise. In this research, an equivalent rattle dynamic model of the idler gear is proposed, and the nonlinear rattle dynamic responses are solved based on the integral method. The effect laws of key factors on nonlinear dynamic performance are investigated by using a bifurcation diagram, spectrum map, and Poincaré map. Finally, the gear backlash, equivalent mass, and rotational speed are optimized based on Kriging surrogate model (KSM) and differential evolution (DE) algorithm by taking the minimization of the maximum rattle noise as the optimal object. It can be concluded that the rattle dynamics of the idler gear show rich nonlinear characteristics as the parameters change. The proposed method can not only reduce the sound pressure level of rattle noise but also provide a viable path and reference value for the low-noise design of the gear transmission system.

Nonlinear Dynamic Characteristics of Automotive Gear Transmission System Based on Pure Torsion Model

“…In mechanical transmission, the normal operation of gears, bearings, shafts and other parts is the basis to ensure its smooth operation. The dynamic performance directly affects the NVH characteristic index of the whole vehicle [9][10]. The complex vibration caused by different forms and various deformation conditions under the action of various forces when the vehicle is driving, and the vibration load of the vehicle itself is large due to suspended operation, resulting in the interaction between the axle and the body, and there is coupling effect and feedback effect, so that the system can not operate normally due to the "jump" phenomenon of vibration during operation.…”

Vibration Characteristics of Spur Gear Under Tooth Fatigue Wear

“…TFW is a relative sliding phenomenon between the two tooth profiles under alternating stress, which will greatly reduce the service life of the gearbox and harm the overall stable power generation characteristics of the wind turbine. Thus, scholars have conducted some indepth studies on tooth surface wear which can basically be divided into simulations [1][2][3][4] and experiments [5][6][7], despite of the complicity in precise tooth wear modeling and the difficulty in obtaining experimental samples.…”