Prediction of gearbox structure noise

The boundary element method can be used to predict the structural noise of the gearbox. The radiated noise from the structural surface is caused by the structural vibration. Therefore, the gearbox and the surrounding air can be regarded as an acoustic system. Boundary element analysis first needs to establish a boundary element model. In fact, the boundary element model is realized by extracting the outer surface of the gearbox and dividing the network. The direct boundary element method is used to solve the external sound field of the gearbox. At the same time, cube field points are established on the outside of the gearbox to obtain the sound intensity nephogram of each side, which is easy to compare with the sound intensity test results.

From the above experiments, it can be known that the gear meshing frequency is the main frequency that affects the noise of the gearbox. The main reason for the large structural noise under this frequency is that the stiffness of the unsupported side of the gearbox is not enough. The stiffness can be improved by adding stiffeners to the side, which has achieved the purpose of reducing the structural noise of the gearbox. The boundary element method analyzes the real and radiated noise characteristics of the gearbox from the perspective of the dynamic and acoustic characteristics of the gearbox. According to the sound intensity test structure, the prediction results basically accurately reflect the characteristics of the radiated noise of the gearbox, which shows the effectiveness of the method applied to the noise prediction of the gearbox, and provides a basis for the vibration and noise control and optimal design of the gearbox.