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本文讨论了频闪全息干涉测振技术在进行模态分析时,由于采用激振频率离散步进的方式进行激励,在共振区往往会产生峰值测量误差,提出如何根据最大允许测试误差选择合适的离散频率增量;文中还探讨了文献[1]中所提出的复模态分析方法,由于被测系统有一定的非线性而产生的理论误差,和当激励信号本身存在一定的失真度时,由于高阶次谐波分量与系统的高阶共振频率一致而引起的系统共振响应对测试结果的影响;指出了影响测试结果最严重的是较低阶次非谐振分量.
In this paper, the stroboscopic holographic interferometric vibration measurement technique is used in modal analysis. Due to the excitation using discrete excitation of excitation frequency, the peak measurement error often occurs in the resonance region. It is proposed that how to choose the appropriate measurement error according to the maximum allowable test error Discrete frequency increment. The paper also discusses the complex modal analysis method proposed in [1]. Because of the theoretical nonlinearity of the system under test, and when there is some distortion in the excitation signal itself, The influence of system resonance response on the test results due to the coincidence of the higher-order harmonic components with the higher-order resonance frequencies of the system is pointed out. The worst-case non-resonant components at lower order are pointed out.