一、引言模态分析技术已经成为振动系统分析与设计中广泛使用的重要手段。二十多年来,发展十分迅速。模态分析的经典含意是:将描述多自由度振动系统动力学性态的线性定常微分方程组变换为一组独立的二阶方程(单自由度)组,以便于求解系统动力响应或稳定性问题 I. INTRODUCTION Modal analysis technology has become an important method widely used in vibration system analysis and design. For more than two decades, development has been rapid. The classical implication of modal analysis is to transform a group of linear ordinary differential equations describing the dynamic behavior of a multi-degree-of-freedom vibration system into a set of independent second-order equations (one-degree-of-freedom) to facilitate the solution of the system dynamic response or stability problem