Non-stationary vibration signal generating method used in acceleration test

Abstract

The invention relates to a non-stationary vibration signal generating method used in an acceleration test. The non-stationary vibration signal generating method comprises the steps of: classifying anddecomposing original vibration acceleration signals into Gaussian vibration signals and sinusoidal vibration signals, and synthesizing the Gaussian vibration signals and sinusoidal vibration signalsinto a new non-Gaussian vibration signal. The non-stationary vibration signal generating method restores the non-Gaussian vibration characteristics and intrinsic acceleration transient of random vibration during the road transportation process. Through separating an acceleration transient signal independently during the decomposition process of the original vibration signals, the newly generated accelerating signal can be used in the vibration acceleration test. The non-stationary vibration signal generating method ensures that the duration and vibration magnitude of the transient accelerationsignal are not subject to change during the compression process of vibration testing time.

Description

technical field [0001] The invention belongs to the field of vibration tests, in particular to a non-stationary vibration signal generation method for acceleration tests. Background technique [0002] Vibration test refers to the test conducted on the object or model subjected to vibration to evaluate the anti-vibration ability of the product in the expected use environment. According to the type of vibration load applied, the vibration test is divided into sinusoidal vibration test and random vibration test. Existing methods for simulating random vibrations: the collected actual vibration signal time-domain spectrum (acceleration spectrum, such as figure 1 shown) by Fourier transform to obtain the corresponding frequency domain spectrum (power density spectrum, such as figure 2 shown), that is, the vibration test process is controlled by the frequency domain spectrum signal, and then the frequency domain spectrum is restored by inverse Fourier transform to obtain the cor...

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Problems solved by technology

However, the disadvantage of this method is that the output random vibration signal is a Gaussian random signal (kurtosis=3), while the actual transportation vibration signal is a non-Gaussian random signal (kurtosis>3); the output is a stable vibration signal, ignoring the There are a large number of acceleration transients in nature, and these transients are far more harmful to the product than the steady-state vibration part, and because the value of the transient acceleration is generally large, its damage mechanism to the product may include falling, collision, etc. Ignoring the transient vibration signal will lead to inaccurate test results; the deviation caused by ignoring the non-Gaussian and non-stationary signal is further enlarged under the accelerated test

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