正弦波形局域失真及相变分析  

Definition and measurement method for local distortion of a sinusoidal waveform

作　　者：梁志国[1] 朱振宇[1,2] 邵新慧[1] 张大鹏[1] 武腾飞[1] 

机构地区：[1]北京长城计量测试技术研究所计量与校准技术重点实验室,北京100095 [2]天津大学精密仪器与光电子工程学院,天津300072

出　　处：《振动与冲击》2013年第18期179-182,188,共5页Journal of Vibration and Shock

基　　金：航空科学基金资助项目(20085644009)

摘　　要：提出正弦波形局域失真的定义与测量方法,用以对正弦波形进行时域分布特性分析与空间分布特性分析,且与正弦波失真度指标体系具有相容性。为区分不同性质的失真,将局域失真细分为局域共模失真、局域差模失真及局域总失真,以各种失真随正弦相位变化规律揭示其时空分布状况,并用以对局域失真极值点进行时空定位。用一组振动信号的实验分析结果验证该方法的正确性与可行性。所述定义及测量方法可用于正弦信号波形的时域失真分析与空间失真分析中。A definition for local distortion of a sinusoidal waveform was presented, the measurement method of local distortion was introduced. They were used for both time domain analysis and space domain analysis of sinusoidal distortion. In detail, a local distortion had three kinds including local common mode distortion, local difference mode distortion, and local total distortion. With these distortions＇ variation laws versus sinusoidal phase, their time-space distributions were described, and the position of their extreme points was determined. Using the results of test and analysis of a group of vibration signals, both the correctness and the feasibility of the proposed method were verified. The results showed that the definition and the measurement method presented here can be applied to precise measurement, time domain analysis and space domain analysis of a sinusoidal distortion.

关 键 词：失真 测量 正弦波 局域共模失真 局域差模失真 局域总失真 评价 

分 类 号：TM935.24[电气工程—电力电子与电力传动] TM930.114