为研究各种机械的结构振动问题、结构动力学问题,必须进行各种机械的振动分析和研究。对系统动力特性的描述和确定,是这种分析和研究的关键。系统(或结构)的动态特性可以通过理论计算和实验测试来确定。对于复杂系统(或复杂结构)的理论分析和计算,不仅相当麻烦,而且有些固有特性参数难以用计算确定。国内外常用的机械 In order to study structural vibration problems and structural dynamics of various machines, various mechanical vibration analyzes and studies must be carried out. Describing and determining the dynamic characteristics of the system is the key to this kind of analysis and research. The dynamics of a system (or structure) can be determined by theoretical calculations and experimental tests. The theoretical analysis and calculation of complex systems (or complex structures) are not only troublesome, but also difficult to calculate with some intrinsic parameters. Commonly used machinery at home and abroad