论文部分内容阅读
要用实验获得系统的数学模型,主要工作是由实测数据按照频响函数(FRF)的理论表达式进行曲线拟合。本章讨论其中的某些方法,并说明它们的优点及其局限性。在讨论分析或识别法的叙述时,我们将首先讨论单模态FRF曲线的拟合,然后讨论包含几个共振点的全频响函数曲线拟合,最后讨论在同一结构上,由许多FRF曲线构成的频响函数组的拟合。上述这三种方法的任务,基本上是相同的,即求频响函数理论表达式中的系数,使理论与测量数据间符合得最好。为了达到这个目的,采用FRF的级数型式有其独特的优点,
To get the mathematical model of the system experimentally, the main work is to curve fit the measured data according to the theoretical expression of frequency response function (FRF). This chapter discusses some of these methods, and explains their advantages and limitations. In discussing the analysis or identification of the narrative, we will first discuss the monomodal FRF curve fitting, and then discuss the resonance point contains several full-frequency response curve fitting, the last discussion on the same structure, by many FRF curve The composition of the frequency response function group fitting. The tasks of the above three methods are basically the same, that is, the coefficients in the theoretical expression of the frequency response function are obtained, so that the theoretical and measurement data accord with each other best. To achieve this goal, the FRF series has its own unique advantages,