Multi-axial vibration test condition tailoring method based on acceleration equivalence

Abstract

The invention provides a multiaxis vibration test condition cutting method based on acceleration equivalence. The method comprises the following steps: applying test conditions in each direction in single-axis vibration to a corresponding direction of multiaxis direction, and according to a cutting principle, changing the test conditions in each direction of the multiaxis vibration so as to obtain test conditions when multiple axes vibrate simultaneously; and determining key points, extracting acceleration response root-mean-square values of the key points in the corresponding direction when each single axis vibrates and acceleration response root-mean-square values in each direction at the key points when the multiple axes vibrate simultaneously, according to test pieces, calculating trapezoid control spectrum reduction coefficients of each direction when the multiple axes vibrate simultaneously, and respectively carrying out cutting according to the solved trapezoid control spectrum reduction coefficients so as to obtain a new control spectrum based on the acceleration equivalence. According to the invention, a vibration control spectrum is equivalently cut under the condition that the multiple axes vibrate simultaneously, such that the phenomenon of too large stress of the test pieces, caused by loads simultaneously applied by the multiple axes is avoided, over-test is avoided, and smooth completion of a test is guaranteed.

Description

technical field [0001] The invention relates to a vibration test, in particular to a multi-axis vibration test condition cutting method based on acceleration equivalent. Background technique [0002] Multi-axis multi-excitation vibration test technology is a vibration test technology that applies vibration in multiple directions at the same time. Due to the change of test conditions, if the test load of uniaxial vibration is applied in each direction at the same time during multi-axis vibration, the load on the test product will be too large, causing over-testing and even product damage. It is necessary to re-establish the multi-axis vibration test conditions . [0003] Since the main parameter in the vibration test is the key point, that is, the acceleration response of the key parts of the product, in order to ensure that the response in each direction during multi-axis vibration is the same as the response when the uniaxial vibration is applied separately, the uniaxial v...

AI Technical Summary

Problems solved by technology

Due to the change of test conditions, if the test load of uniaxial vibration is applied in each direction at the same time during multi-axis vibration, the load on the test product will be too large, causing over-testing and even product damage. It is necessary to re-establish the multi-axis vibration test conditions

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