一、引言结构频率响应函数是结构动力特性中的重要参数,也是模态分析中的核心部份。结构频响函数的测量有很多方法,但直到70年代以前基本上都限制在采用稳态分离频率的方法,其差异只是分析技术的不同着已如。Kennedy 从矢量图上得到固有频率和阻尼系数,Stahe采用相位分离技术求得共振频率和阻尼系数等都是通过激振频率在感兴趣的范围内缓慢地 I. INTRODUCTION STRUCTURE Frequency response function is an important parameter in the structural dynamic characteristics and is also the core part of modal analysis. There are many ways to measure the frequency response of structures, but until the 1970s, the method of using the steady-state separation frequency was basically limited. The difference was only the difference of the analysis techniques. Kennedy from the vector to get the natural frequency and damping coefficient, Stahe using phase separation technique to obtain the resonant frequency and damping coefficient are all through the excitation frequency in the range of interest slowly