To overcome the obstacle of Surface Electromyography ( SEMG) nonlinear characteristic,many methods had been proposed,such as complexity,fractal dimension of nonlinear dynamics.

• 针对表面肌电信号的非线性特征,目前的分析方法有非线性动力学的复杂度及分形维数等,但是单重分形只能反映信号的整体特征,缺乏对局部奇异性的刻画。