位移激励下含负刚度的惯容减振系统参数优化解析研究
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TB535;TU352.1

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国家自然科学基金资助项目(52178474,51978336);河海大学优秀硕士学位论文培育项目(1091422003521);江苏省自然科学基金资助项目(BK20221233);中央高校基本业务费资助项目(B210202127);常州市科技计划项目(CJ20210138);江苏省研究生科研与实践创新计划项目(SJCX22_0168)


Analytical study on optimal inerter vibration absorbers with negative stiffness under displacement excitations
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    摘要:

    为抑制位移激励下主结构的振动,提出了三种含有负刚度的惯容减振系统(N‐ISD),推导了各系统分别在 H∞和 H2优化准则下设计参数的解析解,探究了不同形式 N‐ISD 系统振动控制的特点。建立位移激励下减振系统的动力学方程,得到结构的传递函数。针对简谐位移激励下的振动幅值,采用固定点理论推导了以 H∞范数为优化准则的设计参数解析解;针对随机激励下位移均方值,采用极值理论推导了以 H2范数为优化准则的设计参数解析解。通过与基于遗传算法的数值优化解对比,验证了上述最优设计参数解析解的有效性及优越性。对最优状态下的减振系统进行减振效果分析,结果表明:负刚度的引入能有效降低主结构的振幅放大因子和均方值,简谐激励下N‐SPIS‐Ⅱ型惯容系统反共振峰值更低,共振峰值间距更大,减振效果及稳定性更好;随机激励下 N‐SPIS‐Ⅰ和N‐SPIS‐Ⅱ型惯容系统位移均方值均小于 N‐SIS 型惯容系统,表现出更好的减振性能。

    Abstract:

    Three typical inerter-spring-damper with negative stiffness (N-ISD) are presented to reduce the vibration of the primary system which is subjected to the displacement excitation from the base. The analytical expressions of stiffness ratio and damping ratio are derived based on the H∞ and H2 optimization design for the N-ISDs. The differential governing equations of a primary system equipped with three different N-ISDs subjected to displacement excitation are firstly developed according to D'Alembert's principle. Then the transfer function of the primary system can be further obtained. The analytical solutions for H∞ optimization of NISDs are presented based on the fixed-point theories to minimize the maximum amplitude of the primary system under harmonic displacement excitation. The analytical solutions for H2 optimization designs are presented based on the extreme value theory to minimize the mean squared displacements of the primary system under random excitation. The validity and superiority of the analytical solutions of parameter optimization for N-ISDs are verified by comparing the present results with the numerical results determined by genetic algorithms. Finally, the effects of vibration control with different types of N-ISDs are further explored. The numerical examples indicate that N-ISDs show a better vibration reduction performance than ISDs. N-SPIS-Ⅱ system shows a lower anti-resonance peak and larger resonance peak spacing under the harmonic excitations than two other N-ISDs systems. Moreover, the mean squared displacements of N-SPIS-Ⅰ and N-SPIS-Ⅱ systems are less than that of N-SIS under random excitation.

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王 珏,张 莹,黄 愫,叶会然,周 叮.位移激励下含负刚度的惯容减振系统参数优化解析研究[J].振动工程学报,2023,36(3):804~814.[WANG Jue, ZHANG Ying, HUANG Su, YE Hui-ran, ZHOU Ding. Analytical study on optimal inerter vibration absorbers with negative stiffness under displacement excitations[J]. Journal of Vibration Engineering,2023,36(3):804~814.]

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  • 在线发布日期: 2023-06-26
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