CAJ | 학술논문

为了提高编码器的测速精度，研究了基于希尔伯特-黄变换的光电编码器单莫尔条纹测速方法。首先，利用 AD 采集编码器的单路莫尔条纹光电信号，并将信号序列通过 EMD 变换，滤除直流分量；然后，利用希尔伯特变换求出信号的相位变化，并通过差分运算求取信号的瞬时频率；最后，结合编码器的具体参数求取编码器的转速。实验结果表明：对某21位编码器进行测速实验，测速误差均方差由0.0224 rad ／s 降低到0.0134 rad ／s。此方法测速稳定性高，抗干扰能力强，可用于速度精度要求较高的测速场合。
위료제고편마기적측속정도，연구료기우희이백특-황변환적광전편마기단막이조문측속방법。수선，이용 AD 채집편마기적단로막이조문광전신호，병장신호서렬통과 EMD 변환，려제직류분량；연후，이용희이백특변환구출신호적상위변화，병통과차분운산구취신호적순시빈솔；최후，결합편마기적구체삼수구취편마기적전속。실험결과표명：대모21위편마기진행측속실험，측속오차균방차유0.0224 rad ／s 강저도0.0134 rad ／s。차방법측속은정성고，항간우능력강，가용우속도정도요구교고적측속장합。
In order to improve the velocity measurement accuracy of photoelectric encoder,a velocity measure-ment method based on the single Moir fringe is introduced.First,Moir fringe photoelectric signals are trans-ported into DSP through a AD acquisition card with EMD(Empirical Mode Decomposition)algorithm which is used to curb DC components.Then,the Hilbert transform is utilized to analyze the change of signal phase and the instantaneous signal frequency calculated by using the difference arithmetic.At last,encoder velocity is derived from the specific parameters of the encoder.Experiment results on certain 21 bit photoelectric encoder indicate that the root mean square of the measurement errors has reduced from 0.022 4 rad /s to 0.01 3 4 rad /s.This method is of high speed stability,strong anti-interference ability,and can be used for precision speed occasions with higher requirement.