Design method of low-pass filter for rotating equipment characteristic signal acquisition

Abstract

The invention discloses a design method of a low-pass filter for rotary equipment characteristic signal acquisition. The design method comprises the following steps: S1, acquiring a rotary equipment characteristic signal, a highest frequency component required to be reserved by low-pass filtering and a lowest frequency component required to be filtered; S2, designing a group of low-pass filters according to the highest frequency component required to be reserved and the lowest frequency component required to be filtered in low-pass filtering; S3, adopting a low-pass filter to carry out filtering processing on the rotating equipment characteristic signals, and determining an optimal low-pass filter and a corresponding differential equation; and S4, establishing a low-pass filter differential equation comparison table under different filtering requirements. According to the method, the problem that derivation of an analog filter conversion digital filter is difficult to solve is avoided,and meanwhile the current situation that two parameters of the filter pass-band cut-off frequency and the stop-band cut-off frequency are selected according to experience is optimized; and a differential equation comparison table is established, so that the differential equation of the corresponding filter can be directly selected when actual engineering needs, and the purposes of high efficiencyand high feasibility are achieved.

Description

technical field [0001] The invention relates to the technical field of filters, in particular to a design method of a low-pass filter for collecting characteristic signals of rotating equipment. Background technique [0002] Digital filtering of signal / data is usually the premise and basis of signal processing, and useful components in the filtered signal can highlight the characteristics of the signal more. In the fault diagnosis of rotating equipment, it is of great significance to further study the fault characteristics of rotating equipment to effectively remove or suppress noise effects such as vibration signals and frequency components of current signals in real time through digital filters. [0003] According to the different characteristics of the unit impulse response, digital filters can generally be divided into: infinite impulse response (IIR) digital filter and finite impulse response (FIR) digital filter; according to the difference in amplitude-frequency respo...

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Problems solved by technology

However, in the derivation process, it is difficult to convert the analog filter into a digital filter through the impulse response invariant method or the bilinear transformation method, and the higher-order filter is more difficult to convert, and the complex calculation makes the generalized The formula cannot be solved

In addition, for how to select the two parameters of passband cutoff frequency and stopband cutoff frequency of the best low-pass filter according to actual needs to achieve a better filtering effect, there is currently no universal method

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