In order to obtain a reference signal for active vibration control of a multi-stage gear system，a second-order IIR adaptive notch filter based on the variable step-size unbiased plain gradient (VSSUPG) algorithm was designed. Taking a real-time vibration signal as an input signal, the online estimation of gear meshing frequency was realized through adjusting notch frequency, and the adaptively changing the notch filter’s iterative step method was used to improve the estimation speed and accuracy. Simulation results showed that the proposed adaptive notch filter has a faster estimation speed and a smaller steady-state error than those of the traditional adaptive notch filter; compared with FFT and ratio-corrected FFT, the proposed filter has a better tracking performance to frequency changes. A cascaded notch filter set was constructed by connecting two adaptive notch filters in series to do online estimation of two meshing fundamental frequencies using vibration acceleration signals of a two-stage gearbox. The test results showed that the cascaded notch filter set can be used to quickly and correctly estimate the corresponding meshing frequencies, track meshing frequency changes in real time due to driving and load changes, and verify the effectiveness of the proposed method in practical application.
张锋 罗顺安 张勇 林继铭. 一种改进自适应陷波器在齿轮箱振动信号频率估计中的应用[J]. 振动与冲击, 2019, 38(11): 173-179.
ZHANG Feng, LUO Shun’an, ZHANG Yong, LIN Jiming. Application of a modified adaptive notch filter in frequency estimation of gearbox vibration signals. JOURNAL OF VIBRATION AND SHOCK, 2019, 38(11): 173-179.
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