Research on vibration and sound radiation characteristics of ship stiffened composite plate structure

摘要

Based on Statistical Energy Analysis method, the vibro-acoustic characteristics of stiffened composite plates are investigated in this paper. First, the vibration theoretical model of the stiffened composite plate is developed by using the Hoff sandwich plate theory. The method to calculate the modal loss factor of stiffened composite plate structure is proposed. Then the influence of damping layer thickness, elastic modulus and constraint layer elastic modulus on the vibro-acoustic characteristics of the stiffened composite plate has been studied. The results show that the above three parameters have a great impact on the structural vibro-acoustic characteristics. On this base, the vibro-acoustic characteristics of the cabin segment in composite are investigated. The influence of different constraint damping structure parameters and laying positions on the ship vibration radiation are analyzed. Results show that the laying location of constrained layer damping (CLD) has a great impact on the acoustic radiation reduction. The constrained layer damping laid in the excitation source place can achieve better acoustic radiation reduction.