Setting method for triaxial vibration test conditions according to maximum stress equivalence

Abstract

The invention provides a setting method for triaxial vibration test conditions according to maximum stress equivalence. The setting method comprises the following steps: simultaneously applying test conditions in each direction in monoaxial vibration to three directions of triaxial vibration; changing the test conditions in each direction of the triaxial vibration to obtain test conditions when three shafts vibrate at the same time according to a reducing principle; determining a key point, extracting maximum equivalent stress of the key point when each single shaft vibrates and equivalent stress of the key point when the three shafts vibrate at the same time; calculating a trapezoidal control spectrum reduction coefficient of each direction when the three shafts vibrate at the same time according to the test conditions, respectively reducing according to solved trapezoidal control spectrum reduction coefficients to obtain a new control spectrum according to the maximum stress equivalence. According to the setting method provided by the invention, a vibration control spectrum is equivalently reduced under the condition that the three shafts vibrate at the same time, so that the phenomenon that the stress of a test piece is over great caused by simultaneous application of loads by the three shafts is avoided, over testing is avoided, and smooth finishing of the test is guaranteed.

Description

technical field [0001] The invention relates to a vibration test, in particular to a method for formulating triaxial vibration test conditions based on the equivalent maximum stress. Background technique [0002] The three-axis multi-excitation vibration test technology is a vibration test technology that applies vibrations in the X, Y, and Z directions simultaneously. Due to the change of test conditions, if the X, Y, and Z axial vibration conditions are applied to the three-axis vibration at the same time, it will cause excessive stress on the test product, causing over-testing and even product damage. Shaft vibration test conditions. [0003] Because the main parameter that causes damage in the vibration test is the maximum stress of the key point, that is, the maximum stress of the key part of the product. In order to ensure that the key point stress during triaxial vibration is the same as the maximum equivalent stress during each axial vibration of X, Y, and Z, a tri...

AI Technical Summary

Problems solved by technology

Due to the change of test conditions, if the X, Y, and Z axial vibration conditions are applied to the three-axis vibration at the same time, it will cause excessive stress on the test product, causing over-testing and even product damage. Shaft vibration test conditions

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