参数频域识别的最优采样频率研究

Study on Optimal Sampling Frequency of Parameter Identification in Frequency Domain

摘要: 由给定的施力函数性质,导出了优化识别结构系统模态参数最优采样频率的判据,给出了相应的定理和公式。实际算例表明,频域内最优采样频率与激励的性质有关,而与系统的输出无关。

Abstract: The criteria of the optimal sampling frequency is deduced by optimally indentfing the modal parameters according to the nature of the forcing fuction,and the related principles and formulae are given.The computation example shows that the optimal sampling frequency is independent of the system response,and solely depend on the nature of the excitation.