针对不同噪声强度的影响,分析了分形盒维数的抗噪能力。实验结果表明:在信噪比较大时,分形盒维数基本不受影响,能够反映信号的真实分形特征;当信噪比较小时,分形盒维数的值随着噪声的增强而变大,并且具有明显的线性关系。由于分形盒维数具有抗噪性,当滤波方法比较简单时,仍然可以在一定程度上体现信号的非线性特征。因此,分形盒维数具有一定的抗噪性,可以在机械故障诊断中得到更广泛的应用。
Aiming at the influence of different noise strengths,the anti-noise performance of fractal box dimension was studied.Experiment results indicate that the fractal box dimension is nearly not affected by noise when the SNR is high;the fractal box dimension will increase with noise increasing when the SNR is low,and the fractal box dimension still reflects the nonlinear characteristics of the signal after a simple filtering.Therefore,fractal box dimension has a strong anti-noise ability and can be applied broadly in mechanical fault diagnosis.