Optimization design method for Constrained Damping layer’s noise reduction based on the Hoff sandwich plate theory

Based on Hoff sandwich plate theory, an analytical method is proposed for predicting the loss factors of constrained damping layer. The application of the current approach in the engineering application of acoustic radiation optimization is examined. Numerical examples regarding isotropic sandwich plate with simply supported boundary conditions are carried out to demonstrate the accuracy and reliability of the current approach. It is shown that the current method has a good accuracy in determining loss factors of constrained damping layer. On this basis, optimization design of constrained damping layer is implemented. The effects of main parameters of damping layer on the loss factors are investigated. Then, the current approach is utilized to application of vibration and noise reduction for gearbox housing. Results show that parameters of damping layer have different effect on the vibration and noise reduction. The optimum design parameter of damping layer can be obtained through comprehensive comparison analysis. This investigation can provide an efficient design scheme of acoustic protection with damping layer for vibration and noise reduction.