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本文讨论了随机振动校准中复频响函数的最佳估计。为了从双通道FFT的一次测量中得到被校传感器复频响函数的无偏估计,本文给出了在输入或输出噪声分别存在的不同频域内,两类复频响函数的最佳使用原则;确定了输入与输出中均混有噪声时,被校系统复频响函数模真值上下限的估计。最后,以典型的加速度计系统随机校准对以上结论作了验证。
This article discusses the best estimate of the complex frequency response in stochastic vibration calibration. In order to obtain the unbiased estimation of the complex frequency response of a school-tuned sensor from a single measurement of a two-channel FFT, this paper presents the best use of two types of complex frequency response functions in different frequency domains where the input or output noise respectively exist. When the input and output are both mixed with noise, the upper and lower limits of the true value of the complex frequency response of the system to be calibrated are estimated. Finally, the above conclusion is validated by a typical accelerometer system stochastic calibration.