Abstract
The turn domain resampling (TDR) method is proposed in the paper on the basis of the existing angle domain resampling for solving the problem of non-fixed fault frequency under variable working conditions. TDR can select the appropriate sampling order according to the influence of frequency conversion, which avoided the error caused by the spline interpolation method. It can provide accurate parameters for the subsequent calculation of the equivalent frequency order. Variable multi-scale morphological filtering (VMSMF) method is proposed for the purpose of further reducing the interference of noise in resampling signal to feature extraction. VMSMF adaptively selects structural elements according to the parameter change of impact signal to make its scale more targeted. It only needs to calculate once using the optimal structural unit for a particular impact, and the filtering accuracy and operating efficiency have been greatly improved. The main steps of this article are as follows. First, the TDR is used to resample the original signal as to get the resampling signal which is still submerged by the strong noise. In the second step, VMSMF is used to filter the resampling signal to obtain the signal with less noise interference. Finally, the fault characteristics of the filtering signal was extracted and compared with the possible fault frequency calculated by the sampling parameters provided by resampling, so as to determine the fault type of the planetary gearbox. By analyzing the simulation signal and the experimental signal respectively, this method can find out the corresponding fault characteristics effectively.
Highlights
Planetary gear transmission is widely used in many mechanical transmission systems, including simple machinery and complex equipment, from micro-electromechanical Systems (MEMS) to marine engineering equipment [1,2,3]
In view of computed order tracking (COT) method is limited to some extent when extracting and reconstructing the signals the above problems, this paper proposed a turn domain resampling method based on sigof certain order components for subsequent analysis and processing
Lope spectra of health filtering signals; (d) the FFT envelope spectra of filtering signal for sun wheelThe fault.method based on turn domain resampling (TDR) and variable multi-scale morphological filtering (VMSMF) proposed in the paper is used to analyze the health state of planetary gearbox and the fault state signal of first stage solar wheel
Summary
Planetary gear transmission is widely used in many mechanical transmission systems, including simple machinery and complex equipment, from micro-electromechanical Systems (MEMS) to marine engineering equipment [1,2,3]. In 2019, Luo et al [23] proposed an adaptive multi-scale enhanced combined gradient morphological filtering method and applied to bearing noise signal with good results. This method only provided a variety of operation combinations in the mathematical morphology algorithm, and the traditional method is still used in the selection of structural elements. The selection of element scale of MSMF structure is based on the characteristics of multi-group characteristic impulse signals, which results in the amplification of part of the signal shock and the weakening of part of the signal shock during the filtering This processing method leads to the distortion of the filtered signal.
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