Method for eliminating vibration noise in shaft torsional deformation test

A deformation test and vibration elimination technology, which is applied in the measurement field to achieve the effects of improving measurement accuracy, simple structure and eliminating noise interference.

Inactive Publication Date: 2012-06-13
中国船舶重工集团公司第七0四研究所
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  • Application Information

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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 el...

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  • Method for eliminating vibration noise in shaft torsional deformation test
  • Method for eliminating vibration noise in shaft torsional deformation test
  • Method for eliminating vibration noise in shaft torsional deformation test

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Embodiment Construction

[0016] like figure 1 As shown, reflective gratings (that is, strips reflecting and non-reflecting light) are set on the surface of the measured shaft along the axial distance of a certain length. The reflective gratings can be formed by machining or heat treatment, and require uniform width and flat edges. In principle, mechanical processing cannot affect the mechanical characteristics of the shaft itself. The axial distance can be determined according to the installation space, material characteristics, test sensitivity and resolution requirements. The number of reflective grating stripes in the circumferential direction can be determined according to the dynamic characteristics of the test. For the convenience of data processing, it is recommended to take a multiple of 6, which is listed as 30 in this implementation.

[0017] as attached figure 1 As shown, the A / B, C / D groups of four laser fiber optic sensors use Keyence (Keyence) FS-V30 ultra-high power sensor, which can p...

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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...

Claims

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Application Information

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IPC IPC(8): G01B11/16
Inventor 李涛吉小军易海鸥戴明严康平王佩君
Owner 中国船舶重工集团公司第七0四研究所
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