The Mechanism and Solution of Harmonic Gear Whine Noise in Automotive Transmission Systems

Abstract

Since gear noise in automotive is one of the most unpleasant noises for passengers, various solutions, such as gear design optimization, tooth modification and transfer path reformations in the vehicle have been developed. But, these attempts are mainly focused on the fundamental mesh excitation of the gear set without any consideration of their harmonic noise (1st, 2nd or higher). Harmonic gear whine noise is easily audible in the vehicle because of their high frequency characteristics in spite of low sound pressure level. This annoying pure-tone noise is usually issued in the transmission system composed of the gears produced by grinding process. This paper will present the main sources of this harmonic gear whine noise with the test results of gears with identical design parameters but having different surface structure (roughness parameters, wave patterns). Additionally, manufacturing guidelines of gear surface structure will be proposed at the end of this paper.

Classifying, Predicting, and Reducing Strategies of the Mesh Excitations of Gear Whine Noise: A Survey

“…In a word, there are four primary sources of TE for a gear pair: gear teeth elastic deformation [33,34] and stiffness variance [35][36][37][38][39][40][41][42][43][44][45][46][47], manufacturing errors [30,[48][49][50], misalignments [51][52][53][54][55][56][57][58] due to supporting structures, and intentional profile modifications [33,53,[59][60][61][62][63][64][65][66]. In addition, gear surface roughness [67][68][69][70] also contributes to TE. It is worth mentioning that gear microgeometry correction is a significant approach for minimizing TE excitation; the details of the approach are described in the subsequent sections.…”

Parameter Study and Improvement of Gearbox Whine Noise in Electric Vehicle

“…B Shouyuan Zhang zhangshouyuan@163.com 1 Beijing Electric Vehicle Co., LTD, Beijing 100176, China Yoo et al performed an in-depth study of the gear whine noise mechanism in automotive transmission systems. 3D vibration measurements of the gear surfaces were performed, and the surface roughness parameters were found to play the most important role in whine noise generation.…”

“…3D vibration measurements of the gear surfaces were performed, and the surface roughness parameters were found to play the most important role in whine noise generation. A target roughness value was therefore proposed to be checked in the production line [1]. Perret-Liaudet et al built a finite element model of a gearbox and used measured static transmission error data to predict the structure dynamics response on the gearbox.…”