一种旋转黏滞质量阻尼器对结构响应的控制研究

Study of a Series Viscous Mass Damper in the Control of Structural Response

基于黏滞阻尼单元、惯性质量单元和位移增效机制的原理,介绍了一种新型黏滞质量阻尼器,与传统黏滞质量阻尼器中黏滞单元和质量单元的并联方式不同,其黏滞单元与质量单元采用串联形式,故称为串联黏滞质量阻尼器(SVMD)。首先,阐述黏滞质量放大的概念;然后,建立了SVMD的力学分析模型,并对其进行了结构响应的频域分析、优化设计以及与其他类型阻尼器的对比研究;最后,在时域中对配置SVMD的单质点隔震体系进行了增量动力分析,分别对不同阻尼比和不同地面运动加速度峰值时的隔震体系响应进行了研究。结果表明:当在隔震层中安装SVMD时,单质点体系的隔震频域适用范围较黏滞阻尼器和调谐黏滞质量阻尼器要大,并且传递率较黏滞阻尼器更低;在隔震层位移相等的条件下,安装SVMD的单质点体系的绝对加速度响应更小且阻尼器的能量耗散效率更高。

Based on the basic ideals of viscous damper,tuned mass damper and displacement enhancement,a series viscous mass damper is introduced in the present paper.Different from the traditional viscous mass damper in which the damping element and the mass element connect each other in a parallel way,a series way of connection is assumed,therefore it is named as series viscous mass damper,or SVMD.The concept of the enhancement of viscous mass is presented firstly,followed by the mechanical model of SVMD.The optimum design of SVMD is conducted,and the dynamic analysis in frequency domain is also carried out with different dampers to investigate the seismic response.An incremental dynamic analysis in time domain is conducted to study the seismic response of the single-degree-of-freedom system incorporating a SVMD,considering variable damping and different peak acceleration of ground motion,respectively.The results show that when the system is isolated by SVMD,the frequency range applicable for base-isolation of the SDOF system is wider than that of the system isolated by viscous damper or tuned viscous mass damper,and the transmissibility is lower than that of the system isolated by viscous damper.With equal displacement of isolation layer of the SDOF system,lower absolute acceleration response of the system and higher efficiency of energy dissipation of damper are obtained when it is isolated by a SVMD.