Improved time-lag twin-wire high-speed welding signal filtering method based on prediction

Abstract

The invention relates to the field of twin-wire high-speed welding signal filtering, and specifically discloses an improved time-lag twin-wire high-speed welding signal filtering method based on prediction. The method comprises the following steps: (1) sampling a voltage or current signal in the twin-wire high-speed welding process, computing sample signal error within a certain time, and obtaining a trend threshold value according to the sample signal error; (2) dividing the voltage or current signal into a rising section, a descending section and a stable section according to the trend threshold value; (3) respectively setting a rising trend factor and a descending trend factor for signals at the rising section and the descending section; (4) setting an acceleration factor, adding the acceleration factor on the signal at the rising section of the signal, and subtracting the acceleration factor from the signal at the descending section of the signal; (5) performing sectional filtering processing on the signal according to the rising section, the descending section and the stable section. Through the adoption of method disclosed by the invention, the lagging problem of the traditional time-lag algorithm is reduced, so that the filtering effect has more real-time capability.

Description

technical field [0001] The invention relates to the research field of signal processing in twin-wire high-speed welding, in particular to an improved time-delay twin-wire high-speed welding signal filtering method based on prediction. Background technique [0002] Twin-wire high-speed welding power source is a combination system of strong current and weak current. During twin-wire high-speed welding, the welding current signal is subject to various disturbances, including: [0003] (1) The current of the twin-wire high-speed welding power source can reach hundreds or even thousands of amperes, thereby generating a large electromagnetic field and affecting the current waveform; [0004] (2) The high-frequency switching of the inverter power diode will interfere with the current waveform; [0005] (3) Due to the ever-changing loads added to the power grid, these loads will more or less interfere with the power grid. For example, the use of high-power equipment distorts the v...

AI Technical Summary

Problems solved by technology

[0003] (1) The current of the twin-wire high-speed welding power source can reach hundreds or even thousands of amperes, thereby generating a large electromagnetic field and affecting the current waveform;

[0004] (2) The high-frequency switching of the inverter power diode will interfere with the current waveform;

In addition, some researchers have carried out research on wavelet filtering, such as Duan Bin et al. have conducted research on wavelet signal denoising, Zhou Yiqing et al. have conducted research on exponential decay adaptive threshold wavelet denoising method, but these These methods have the characteristics of complex calculation and poor real-time performance.

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