Multi-axis vibration test condition cutting method based on fatigue damage equivalent analysis

Abstract

Provided is a multi-axis vibration test condition cutting method based on a fatigue damage equivalent analysis. The method includes: determining a certain point of a product key position as an examination point, calculating the accumulated damage amount of the point in the main vibration direction under single-axis successive vibration, reversely reasoning the equivalent stress value of the point during three-axis random vibration and the equivalent stress of the point during three-axis vibration before cutting by regarding the damage amount as the damage amount of the point during three-axis vibration and by employing a fatigue damage calculating method, calculating the root mean square value of a control spectrum before cutting by employing increase spectrum, reduction spectrum and flat spectrum calculating formulas, calculating the root mean square value of an acceleration power spectrum of the control spectrum after cutting through an equation of the ratio relation of a linear system, and performing reverse reasoning through the increase spectrum, reduction spectrum and flat spectrum calculating formulas to obtain the cut control spectrum. According to the method, equivalent cutting of the vibration control spectrum can be performed in the condition of multi-axis simultaneous vibration, and over-test of the product in the multi-axis multi-excitation vibration test due to blind usage of the test condition during single-axis vibration is avoided.

Description

technical field [0001] The invention relates to a multi-axis vibration test, in particular to a multi-axis vibration test condition cutting method based on fatigue damage equivalent analysis. Background technique [0002] Multi-axis multi-excitation vibration test technology is a vibration test technology that applies exciting forces from multiple directions at the same time. Compared with the uniaxial vibration test, this technology can more realistically simulate the actual environment and save test time, but if the test conditions of the uniaxial vibration are used blindly, the product will be over-tested in the multi-axis and multi-excitation vibration test, which may even cause severe damage. The product is damaged. [0003] Therefore, the industry needs to re-establish the vibration test conditions before carrying out the multi-axis multi-excitation vibration test, and properly tailor the uniaxial test conditions. In order to cut out reasonably and effectively, a mul...

AI Technical Summary

Problems solved by technology

Compared with the uniaxial vibration test, this technology can more realistically simulate the actual environment and save test time, but if the test conditions of the uniaxial vibration are used blindly, the product will be over-tested in the multi-axis and multi-excitation vibration test, which may even cause severe damage. product damage

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