变反激励力作用下齿轮箱减振降噪方法研究OA北大核心CSTPCD

Based on the principle of active vibration control,the vibration and noise reduction effect of gearbox is studied by changing the inverse-excitation force.The dynamic model of the gearbox system is established to analyze the bearing reaction force.The vibration characteristics of the gearbox are analyzed by the finite element method.The vibration test platform of the gearbox is established,and the placement position of the secondary force source is determined by comprehensively considering the finite element analysis results and experimental results.Based on the active vibration control method,different excitation forces are applied to the secondary force source to suppress its vibration,and the vibration reduction effect under different excitation forces is analyzed.The surface vibration data obtained from the gearbox is imported into the LMS Virtual Lab acoustic software as boundary conditions to calculate the noise radiated by the gearbox to the external sound field.The results show that the anti-excitation force with the same amplitude and opposite phase has the best vibration reduction effect,which is reduced by 0.18 mm in average compared with that without the control.The anti-excitation force applied to suppress the dominant mode has the best noise reduction effect,and the maximum noise reduction reaches 50.13 dB at the frequency of 1191 Hz.