Acoustic-vibration analysis of the gear-bearing-housing coupled system. (July 2021)

• Record Type: Journal Article
• Authors: Han, Jiyuan; Liu, Yang; Yu, Shuanghe; Zhao, Siyao; Ma, Hui
• Is Part Of: Applied acoustics. Volume 178(2021)
• Publication Date: 2021-07
• Subjects: Gear -- Housing -- Dynamic response -- Acoustic radiation; Acoustical engineering -- Periodicals; Periodicals; 620.2
• DOI: 10.1016/j.apacoust.2021.108024
• Languages: English
• ISSNs: 0003-682X

Abstract

Graphical abstract: Firstly, the dynamic model of spur gear-shafting-bearing system was established, and the excitation force of the housing was calculated by this model. Then, the finite element model of the housing was constructed, and the harmonic response analysis was performed to obtain the housing surface node velocity. The noise distribution around the gearbox was calculated by using the acoustic boundary element method, and the panel acoustic contribution was also analyzed. Finally, the dynamic and acoustic experiment were carried out to verify the simulation result. Highlights: The bearing forces are calculated as the excitation force of the housing. Vibrations of housing are caused by the vibration of gear transmitted through the bearing seat. The vibrations of the housing itself are the most important source of noise. The gear meshing has a great influence on the acoustic radiation characteristics. Abstract: Aiming to solve the problem of noise generated by running gearbox, a computing method was proposed for predicting the noise of a gearbox from steady dynamic response to the acoustic radiation calculation. Vibrations, generated during gear meshing process, were transmitted to the bearing through the shafting. Then vibrations were transmitted to the housing, caused the vibration of housing. The vibration noise of housing was the main source of gearbox noise. Firstly, a dynamics model of the gear-rotor-bearing system was established. A dynamic bearing force was calculated by using this model, which was taken as the excitation force for the gearbox. Then, a housing finite element model was constructed, and the housing surface velocities excited by the dynamic bearing forces were obtained. Finally, an acoustic model was established using the acoustic boundary element method to predict the noise distribution of the gearbox, and the effects of meshing excitation on vibration and noise of the gearbox were found. An experimental bench was built to measure the vibration and noise of the gearbox, which verified the accuracy of the simulation results. This study was based on the overall methodology that could provide ideas for the gearbox optimized design.