控制用肌电信号的测试方法和实验研究

STUDIES ON MYOEIECTRIC SIGNALS FOR CONTROL PURPOSES

本文探讨了控制用肌电信号的测试方法,包括:时域描记与频域显示,电极的比较和选用,测试肌肉位置的选择与固定,以及测试与统计项目的确定等。对27位前臂截肢者和10名正常人前臂反复进行了肌电测试。利用快速付里叶变换方法(FFT)实时分析仪进行数字处理的结果,发现受试正常人的不同肌肉的肌电信号,其频率、幅值不仅在数值范围上有区别,在分布上也各有它的特征,其肌电频率特性曲线形状各不相同。正是这一肌电信号发放特征上的区别,对肌电信号用于控制,有很重要的意义。并对生物电基本理论的研究和探讨,提供了有益的课题。

ABSTRACTStudies on characteristics of myoelectric ( EMG ) signals for controlpurposes were reported. It has been found that EMG signals emitted frommuscles of normal subjects vary with their stationary myoelectric regions,strength signals and clear antagonistic characters. Each type of EMGsignal has its own characteristic amplitude-frequency curve. Amplitude-frequency curves of EMG signals emitted from the muscle of differentsubjects or from the same muscle during performing a repeated action areessentially similar. Results suggest that there are some regularities in theemission of EMG signals from different muscles. EMG signals from dif-ferent muscles with greater amplitudes have different frequency ranges.These characteristics of EMG signals are favorable for using them forcontrol purposes. The myoelectric antagonism in muscles of normal subjectsindicates that EMG signals of different characteristics are being emittedconstantly regardless whether the muscle is in action or quiet. Resultsalso show that EMG signals from amputees are much more complicated,showing great peraonal variations, and that the myoelectric antagonism inmuscles of amputees is quite different from that of normal subjects.