A structural design method of gearboxes with low noise at multi-field points by combining acoustic contribution and topology optimization

A method which can determine the rib layout on gearbox efficiently to reduce the radiated noise at multi-field points was proposed. Firstly, the process of determining the region with largest acoustic contribution was described. The topology optimization model which can reduce the radiated noise of gearbox at a single field point was established. In this optimization model, the minimization of velocity on the node which has maximum normal vibration velocity in the region with largest acoustic contribution was taken as objective. Then, the measurement index of radiated noise of gearbox at multi field points was proposed. The structural design method of gearbox with low radiated noise at multi-filed points was established based on the measurement index and topology optimization model. Lastly, the ribs which can reduce the radiated noise were arranged on the gearbox in the double helical gear transmission system using the proposed method. The results show that the sound pressure level at the target field point is reduced obviously every time after arranging the noise reduction ribs on gearbox according to the topology optimization result. The radiated noise of gearbox at multi-field points is reduced obviously after arranging noise reduction ribs many times using the proposed method. © 2021, Editorial Office of Journal of Vibration and Shock. All right reserved.