Method for eliminating vibration noise in shaft torsional deformation test

Abstract

The invention relates to a method for eliminating vibration noise in shaft torsional deformation test. The method comprises the following steps of: arranging reflecting gratings on a tested shaft at equal intervals along an axial direction; arranging a group of laser fiber sensors at a position over against each reflecting grating to constitute a test channel; arranging another completely the same group of laser fiber sensors at a position which is orthogonal to the first group of laser fiber sensors to constitute another test channel; synchronously acquiring two paths of original signals through double channels for performing empirical mode decomposition (EMD) to obtain each order of intrinsic mode function (IMF) comprising different types of information; performing correlation analysis on each order of IMF for the two paths of signals; extracting an IMF reflecting a specific load function; and performing weighted averaging on the IMF to obtain tested information, i.e., shaft torsional deformation. The method has the advantages of simple structure, low cost, high anti-jamming capacity and adaptability to severe environments. Measuring accuracy is increased greatly.

Description

technical field [0001] The invention relates to a measurement technology, in particular to a method for eliminating vibration and noise in a shaft torsional deformation test. Background technique [0002] Shaft torsional deformation can reflect a lot of information such as shaft material properties, load characteristics, and safety. It is a basic but critical testing technology in mechanical engineering, and its testing includes static and dynamic measurements. Static measurement is mainly to test the torsional mechanical properties of materials; in dynamic measurement, it can indirectly represent the operating status information such as torque and power of rotating power mechanical equipment, so as to monitor and diagnose the dynamic characteristics and operational reliability of the equipment. Therefore, the shaft torsional deformation is an important content of various mechanical product development, quality inspection, optimization control, working condition monitoring a...

AI Technical Summary

Problems solved by technology

[0007] The present invention aims at the problem of the dynamic variability of shaft torsional deformation, and proposes a method for eliminating vibration and noise in the shaft torsional deformation test, which eliminates the impact of vibration on test results, and solves the dynamic real-time measurement of torsional deformation of high-speed rotating shafts under harsh conditions problem, greatly improving measurement accuracy

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