噪声与振动控制2019，Vol.39Issue(2)：186-193,8.DOI:10.3969/j.issn.1006-1355.2019.02.035
低频线谱激励下动力吸振器设计研究
Research of the Design of Dynamic Vibration Absorbers under Low Frequency Line Spectrum Excitations
摘要
Abstract
Currently, dynamic vibration absorbers are scarcely used in ship field and the measures of vibration and noise reduction are difficult to achieve at low frequencies. In this paper, the design process of the dynamic absorbers under low frequency line spectrum excitations is constructed and its vibration and noise reduction characteristics are studied. First of all, a scaled double-layer bottom model of the ship cabin is established. Its harmonic response in the frequency range of 20 Hz-400 Hz under the acceleration excitation of the pump’s foot is analyzed. The displacement response peak of each node is obtained. It is determined that 33 Hz is the vibration absorption frequency of the dynamic vibration absorber (DVA). Then, the optimal parameters of the DVA are determined based on the fixed-point theorem and the equivalent parameters of the main system are identified by the rational fractional polynomial method. The vibration-absorbing performances of DVAs with different number and different mass of the mass blocks are studied. Finally, the Virtual Lab boundary element model is established to solve the sound radiation power of the outer layer of the double-layer bottom model before and after the dynamic vibration absorbers are installed. Simulation results show that the absorber design process is reasonable and the vibration intensity and radiation sound power of the double-layer bottom model are greatly reduced at the frequency of 33 Hz; the level of sound radiation power of the bottom is reduced by about 9.55 dB in the frequency range of 20 Hz-60 Hz, and the effect of vibration and noise reduction is obvious.关键词
振动与波/动力吸振器/船舶减振降噪/低频线谱激励/有理分式多项式法Key words
vibration and wave/ dynamic vibration absorber/ measures for vibration and noise reduction/ low frequency line spectrum/ rational fractional polynomial method分类
交通工程引用本文复制引用
贺辉雄,向阳,张波..低频线谱激励下动力吸振器设计研究[J].噪声与振动控制,2019,39(2):186-193,8.基金项目
国家自然科学基金资助项目(51079118,51279148) （51079118,51279148）
国防预研基金资助项目(10204010410) （10204010410）
