残周期正弦波形总失真度的测量评价

Distortion Evaluation Method of Partial Sinusoidal Waveforms

针对残周期正弦信号波形总失真度的评价校准,提出了一种技术方案,包括:直接使用残周期正弦曲线拟合方法进行参数估计和残差估计,然后按照测量系统量程以及动态有效位数进行失真度的修正,最终给出残周期正弦波形曲线的总失真度评价结果。讨论了残周期情况下谐波失真的测量评价问题,获得了残周期波形谐波分析误差较大、谐波失真评价结果远大于总失真度的结论,残周期正弦波形的谐波分析尚无法进行实际应用。在一组超低频振动实验数据的基础上,对残周期和多周期正弦波形总失真度的评价结果进行了比较,验证了本文方法的有效性和可行性。

Aiming at the evaluation and calibration of the total distortion of the partial period sinusoidal signal waveform,we have proposed a technical solution,which includes directly using the partial period sinusoidal curve fitting method for parameter estimation and residual estimation,then correcting the distortion according to the measurement system range and effective bit,and finally giving the evaluation result of the total distortion of the partial period sinusoidal waveform.At the same time,the measurement and evaluation of harmonic distortion in the partial period waves are discussed,and the conclusion that the harmonic analysis error of the partial period waveform is large and the evaluation result of the harmonic distortion is much larger than the total distortion is obtained.The harmonic analysis of partial period sinusoidal waveform is not yet practical.Based on a set of ultra-low frequency vibration experimental data,the evaluation results of the total distortion of the partial-period and multi-period sinusoidal waveforms are compared,which verifies the effectiveness and feasibility of the method in this paper.