噪声与振动控制2019，Vol.39Issue(1)：60-66,7.DOI:10.3969/j.issn.1006-1355.2019.01.012
不同激励下双层底振动传递特性研究
Study on Vibration Transmission Characteristics of Double-layer Bottom under Different Excitations
摘要
Abstract
In order to control the radiated noise of ships caused by structural vibration, the double layer bottom of the engine room of a certain type of ships is extracted and proportionally contracted for finite element analysis. Vibration acceleration of the marine centrifugal pump is used as a single stimulus, and the centrifugal pump and exciting machine excitation forces represent the multi-excitation. In the 20 Hz - 400 Hz frequency range, the frequency responses of the double layer bottom under single excitation and multiple excitations are analyzed and the structural sound intensities of the bottom girder and the plate floor are calculated. The main transmission paths of the peak frequency are identified according to the contributions of the structural sound intensities and the structural sound intensity vector diagrams of each plate floor and bottom girder. On this basis, vibration isolation mass is arranged on the main transmission path, the far-field radiated sound of the double layer bottom is calculated by the acoustic boundary element method. The feasibility of the vibration reduction measures according to synthetic noise power level in the frequency band is evaluated. It is found that the main transmission paths of the double-layer bottom structure under single excitation and multiple excitations are located beneath the excitation side. The peak response frequency of the system changes from 33 Hz to 87 Hz after the single excitation turns to multi-excitation. The structure sound intensity in the Y-direction of the bottom girder and the plate floor is increased by nearly 10 times; By arranging vibration damping mass in the main vibration transmission path, the acoustic radiation of the structure is reduced by 8.2 dB.关键词
振动与波/双层底/结构声强/传递路径/声辐射Key words
vibration and wave/double layer bottom/structural sound intensity/transfer path/sound radiation分类
通用工业技术引用本文复制引用
何鹏,向阳,郭宁,张冠军,姜超君..不同激励下双层底振动传递特性研究[J].噪声与振动控制,2019,39(1):60-66,7.基金项目
国防预研基金资助项目(10204010410) （10204010410）
