组合结构振动的等效阻尼比

EQUIVALENT MODAL DAMPING RATIOS OF VIBRATION IN COMPOSITE STRUCTURES

本文采用滞后阻尼的假定,在获得组合结构含有滞后阻尼系数的复频率方程后,进而导出了一种分析组合结构体系等效阻尼比的方法,运用该方法,只要在实数范围内,采用通常的特征值方法或所选用的软件,便可获得各种组合结构任一阶等效阻尼比,简单且实用。本文最后给出了一个组合悬臂结构和组合高层建筑筒体结构的实例。

In this paper, a simple and effective method is proposed for analyzing equivalent modal damping ratios of composite structures, this being initiated after the representation of complex frequencies including hysterestic damping coefficients are obtained, in the case of hysterestic damping. In this method, arbitrary equivalent modal ratios may be obtained for all kinds of composite structures provided that all calculations are in the domain of real numbers and familiar method of eigenvalue or related software are adopted. In the paper, numerical examples are given for the calculation of a composite cantilever bar and a composite tube-in-tube tall building.