Steady-state response attenuation of a linear oscillator–nonlinear absorber system by using an adjustable-length pendulum in series: Numerical and experimental results
Steady-state response attenuation of a linear oscillator–nonlinear absorber system by using an adjustable-length pendulum in series: Numerical and experimental results
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DOI：
10.1016/j.jsv.2015.01.030
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发表时间：
2015-05
影响因子：
4.7
通讯作者：
R. P. Eason;C. Sun;A. Dick;Satish Nagarajaiah
中科院分区：
文献类型：
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作者：
R. P. Eason;C. Sun;A. Dick;Satish Nagarajaiah
采用数值计算和试验相结合的方法，研究了线性主结构（PS）-非线性调谐质量阻尼器（NTMD）动力系统在串联配置和不串联配置自适应长度调谐质量阻尼器（ALPTMD）时的响应衰减。在PS-NTMD系统中，共存的高和低振幅的解决方案，在实验中观察到，验证以前的数值计算的努力。为了消除潜在的危险的高振幅的解决方案，一系列ALPTMD的质量比PS几个数量级小的NTMD。ALPTMD是用来代表稳态行为的智能调谐质量阻尼器（STMD）。在实验中，调整钟摆的长度，使其固有频率与谐波地面运动的主频率相匹配。在本研究中，建议ALPTMD可以锁定，使其无法振荡和影响系统的动态，以获得NTMD提供的好处。实验数据显示出良好的定性协议与参数连续和时间积分方法计算的数值预测。ALPTMD的激活可以成功地防止响应从低振幅解决方案到高振幅解决方案的转变，或者将响应从高振幅解决方案返回到低振幅解决方案，从而保护PS。
Response attenuation of a linearprimary structure(PS)–nonlinear tunedmass damper(NTMD) dynamic system with and without anadaptive-length pendulumtuned mass damper(ALPTMD) in a series configuration is studied by using numerical and experimental methods. In the PS–NTMD system, coexisting high and low amplitude solutions are observed in the experiment, validating previous numerical efforts. In order to eliminate the potentially dangerous high amplitude solutions, a series ALPTMD with a mass multiple orders of magnitude smaller than the PS is added to the NTMD. The ALPTMD is used in order to represent the steady-state behavior of a smart tuned mass damper (STMD). In the experiment, the length of the pendulum is adjusted such that its natural frequency matches the dominant frequency of the harmonic ground motions. In the present study, the proposed ALPTMD can be locked so that it is unable to oscillate and influence the dynamics of the system in order to obtain the benefits provided by the NTMD. The experimental data show good qualitative agreement with numerical predictions computed with parameter continuation and time integration methods. Activation of the ALPTMD can successfully prevent the transition of the response from the low amplitude solution to the high amplitude solution or return the response from the high amplitude solution to the low amplitude solution, thereby protecting the PS.