Processing method and system of multi-axis vibration coherence function spectrum

A technology of coherence function and processing method, applied in vibration testing, testing of machine/structural components, measuring devices, etc., can solve problems such as lack of scientificity, low accuracy, and inability to reproduce the working environment well

Active Publication Date: 2019-05-24
CASIC DEFENSE TECH RES & TEST CENT
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Problems solved by technology

The multi-axis vibration test spectrum includes self-power spectrum and coherence function spectrum. The inductive processing technology of self-power spectrum is relatively mature, but the inductive process...

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  • Processing method and system of multi-axis vibration coherence function spectrum
  • Processing method and system of multi-axis vibration coherence function spectrum
  • Processing method and system of multi-axis vibration coherence function spectrum

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[0032] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0033] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are to distinguish two entities with the same name but different parameters or parameters that are not the same, see "first" and "second" It is only for the convenience of expression, and should not be construed as a limitation on the embodiments of the present invention, which will not be described one by one in the subsequent embodiments.

[0034] When conducting multi-axis / multi-point vibration tests, the coherence function is usually set based on experience, without considering the coherence in the actual vibration environment, which seriously reduces the authenticity and reliability of the multi-axis v...

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Abstract

The invention discloses an induction processing method of a multi-axis vibration coherence function spectrum. The method includes: collecting linear vibration time domain data; converting the linear vibration time domain data into six-freedom-degree time domain data; determining the coherence function among the freedom degrees, and finding out the distribution law of the coherence function; determining the containment interval of the square of the coherence function, the tolerance upper and lower limit estimation of the mean value of the coherence function and the tolerance upper and lower limit estimation of the standard deviation of the coherence function; determining the tolerance upper limit and tolerance lower limit of the coherence function so as to obtain the actually measured spectrum estimation of the coherence function; dividing the actually measured spectrum estimation into several frequency bands; acquiring the tolerance upper limit and lower limit, in each frequency band,of the coherence function so as to obtain the flat spectrum estimation, in each frequency band, of the coherence function; connecting the coherence function flat spectrum estimation in the frequency bands to obtain the tolerance range of the standard spectrum estimation of the coherence function; regulating a control instrument to control the coherence function of a multi-axis vibration system tobe in the tolerance range.

Description

technical field [0001] The invention relates to the field of environment and reliability test, in particular to a method and system for processing multi-axis vibration coherence function spectrum. Background technique [0002] Vibration testing is widely used in aerospace, automotive, civil engineering and other fields. Among them, the most cutting-edge technology is multi-axis vibration testing technology, which can assess the reliability of test pieces to a certain extent. The multi-axis vibration test spectrum includes self-power spectrum and coherence function spectrum. The inductive processing technology of self-power spectrum is relatively mature, but the inductive processing technology of coherent function spectrum is not perfect. The traditional method is based on the experience of the experimenter. Scientific, with low accuracy, does not reproduce the actual working environment well. Contents of the invention [0003] In view of this, the object of the present in...

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Application Information

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IPC IPC(8): G01M7/06
Inventor 邹学利王海燕
Owner CASIC DEFENSE TECH RES & TEST CENT
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