主动变刚度结构的动力卸载效应
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摘要
本文讨论了主动变刚度结构体系AVS(ActiveVariableStiffness)的动力卸载效应。结构体系中的AVS控制器关闭或开启瞬时,结构系统刚度分布发生突变,通常也伴随着对系统的能量输入或输出,使得该瞬时结构体系相应受到一加速度增量作用,此增量的方向与结构加速度方向相反,能有效地抑制结构体系的刚度不变层向刚度突变层的动力卸载。此外,文中分析了AVS控制器闭合或开启引起的结构体系相对于原结构的第i阶自振频率摄动,进而讨论了AVS控制器的开关控制律和结构的自振频率摄动及动力卸载效应的相互关系。理论分析和计算结果表明:在合理的结构变形位置闭合或开启AVS控制器,动力卸载效应对结构体系的不利作用及结构体系的频率特性相对于原结构改变很小。
The dynamic unloading effect of actively variable stiffness structural system is presented in this paper. When the actively variable stiffness controllers fixed on the structure is turned on or off, the distribution of structural system′s stiffness changes with energy input or output, and the increment action of acceleration the direction of which is opposite to the acceleration applies on the structure. It shows that the dynamic unloading of actively variable stiffness structure can be restrained effectively. This paper also presents the perturbation of the system′s natural frequency caused by the action of AVS controller. Furthermore, the relationship among the controlling rule of AVS controller, the perturbation of natural frequency and the unloading process of structure is analyzed. The results of theoretical analysis and calculation show that while the AVS controller is turned on or off at a suitable deformed position of structure, unfavorable action of dynamic unloading on AVS structure, and the change of AVS structure′s natural frequencies with respect to original structure are little.
The dynamic unloading effect of actively variable stiffness structural system is presented in this paper. When the actively variable stiffness controllers fixed on the structure is turned on or off, the distribution of structural system′s stiffness changes with energy input or output, and the increment action of acceleration the direction of which is opposite to the acceleration applies on the structure. It shows that the dynamic unloading of actively variable stiffness structure can be restrained effectively. This paper also presents the perturbation of the system′s natural frequency caused by the action of AVS controller. Furthermore, the relationship among the controlling rule of AVS controller, the perturbation of natural frequency and the unloading process of structure is analyzed. The results of theoretical analysis and calculation show that while the AVS controller is turned on or off at a suitable deformed position of structure, unfavorable action of dynamic unloading on AVS structure, and the change of AVS structure′s natural frequencies with respect to original structure are little.
引文
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[2] J.N.YANG,etal.Controlofseismic-excitedbuildusingactivevariablestiffnesssystems.EngineeringStructures[J].1996,18(8):589-596.
[3] 李宏男,阎石.中国结构控制的研究与应用[J].地震工程与工程振动,1999,19(1):107-112.
[4] 阎维明,谭平.多自由度主动变刚度控制体系的振型控制[J].地震工程与工程振动.1999,19(1):120-126.
[5] 何亚东,何玉敖,黄金枝.建筑结构半主动控制振动台试验研究[J].建筑结构学报,2002,23(4):10-15.
[6] 陈塑寰,结构动态设计的矩阵摄动理论[M].北京,科学出版社,1999.2:97-106.
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