Research on Constrained Damping Layer for Noise Reduction in Hydraulic Piston Motors
In order to address the severe vibration and noise issues in hydraulic piston motors,as well as the design difficulties and high optimization costs associated with traditional methods of vibration and noise reduction focusing on internal acoustic sources and external shell structure optimization,a vibration reduction and noise reduction method is proposed by applying a constrained damping layer to the shell of hydraulic piston motors.Dynamic models of the inclined-axis piston motor and hydraulic system are established and coupled for simulation to obtain the vibration excitation of the motor on the shell.By applying vibration excitation as the load and utilizing forced response analysis along with acoustic pressure simulation based on the modal acoustic transfer vector method,the modal participation factors and acoustic panel contributions of the motor housing are determined,allowing for precise damping layer placement.Finite element modeling analysis is conducted on the constrained damping layer to investigate the effects of damping material parameters on vibration suppression,enabling the selection of appropriate damping layer materials.Average sound pressure level tests a performed under multiple operating conditions in a semi-anechoic chamber.The results indicate that at peak noise frequencies,the constrained damping layer can reduce the noise of hydraulic piston motors by at least 2 dB.