低频线谱激励下动力吸振器设计研究

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英文篇名：Research of the Design of Dynamic Vibration Absorbers under Low Frequency Line Spectrum Excitations 作者：贺辉雄 ; 向阳 ; 张波 英文作者：HE Huixiong;XIANG Yang;ZHANG Bo;Key Laboratory of High Performance Ship Technology,Ministry of Education, Wuhan University of Technology;School of Energy and Power Engineering, Wuhan University of Technology; 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 英文关键词：vibration and wave;;dynamic vibration absorber;;measures for vibration and noise reduction;;low frequency line spectrum;;rational fractional polynomial method 中文刊名：ZSZK 英文刊名：Noise and Vibration Control 机构：武汉理工大学高性能船舶技术教育部重点实验室;武汉理工大学能源与动力工程学院; 出版日期：2019-04-18 出版单位：噪声与振动控制 年：2019 期：v.39 基金：国家自然科学基金资助项目(51079118,51279148);; 国防预研基金资助项目(10204010410) 语种：中文; 页：ZSZK201902036 页数：8 CN：02 ISSN：31-1346/TB 分类号：192-199

摘要

针对动力吸振器在船舶领域应用较少及舰艇在低频振动时减振降噪措施较难实现这一现状,构建低频线谱激励下舰艇附加动力吸振器设计流程及研究其减振降噪特性。首先,按比例建立某舰艇双层底仿真模型,并在20Hz～400 Hz频段内对离心泵机脚加速度激励下的该双层底模型进行谐响应分析,得到各节点处位移响应峰值并确定33 Hz为动力吸振器吸振频率,然后应用有理分式多项式法识别安装位置处主系统等效参数及通过定点理论确定动力吸振器参数,同时探究动力吸振器质量和安装数量对吸振效果的影响。最后,建立Virtual Lab边界元模型,求解吸振前后双层底模型外底辐射声功率。仿真结果表明:动力吸振器设计流程合理,双层底模型在吸振频率33 Hz处振动烈度数值及辐射声功率均有较大程度降低;20 Hz～60 Hz频段内外底板合成声功率降低9.55 dB,减振降噪效果明显。
        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 of20 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.

引文

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