Determination Method of Vibration Input Spectrum Parameters Based on Vibration Response Characteristics and Valley Control

Abstract

The invention discloses a vibration response characteristic and wave trough control-based vibration input spectrum parameter determination method. The method comprises the following steps: 1) determining the key position, to be concerned during the vibration, of a product according to the characteristics of the product; 2) measuring to obtain all the characteristic frequency ranges of a vibration response curve of the key position; 3) determining the power spectral density of each characteristic frequency range in a used input spectrum, and calculating to obtain the power spectral density amplification factor of each characteristic frequency range; 4) obtaining the spectral density of each characteristic frequency range in a target response line, and calculating to obtain the spectral density of each characteristic frequency range in a designed input spectrum; and 5) ranking the obtained characteristic frequency ranges from small to large, and calculating to obtain the spectral density gain or attenuation slopes of adjacent frequency ranges, wherein the spectral density gain or attenuation slopes are input spectrum parameters. According to the method disclosed in the invention, the unexpected screening results of the product due to product superiority frequency response can be effectively avoided, and the hidden reliability danger caused by excessive screening experiments can be avoided.

Description

technical field [0001] The invention relates to a method for determining vibration input spectrum parameters based on vibration response characteristics and valley control. The invention belongs to the technical field of vibration screening test of electronic products. Background technique [0002] Environmental stress screening technology for electronic products is a technology for early detection of internal defects by applying reasonable environmental stress and electrical stress to electronic products. It is generally believed that if the vibration magnitude exceeds 0.04g 2 / / Hz of +3dB, the test product will have fatigue damage, causing reliability risks and even undue failures. Therefore, the vibration input spectrum must be scientifically controlled during the vibration screening test. [0003] At present, the random vibration screening conditions used for complete electronic products are mainly from the 6.06g vibration spectrum line summed up based on previous eng...

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Problems solved by technology

[0003] At present, the random vibration screening conditions used for complete electronic products are mainly from the 6.06g vibration spectrum line summed up based on previous engineering experience in GJB1032-90. In the actual operation process, it is often input at the external installation mechanical interface of the product. There are also inputs on the key parts of the product after the shock absorber is removed, but still because of the multi-order vibration dominant response frequency of each part of the whole machine, the vibration spectral density of some parts exceeds or even far exceeds 0.04g 2 / +3dB tolerance per Hz

For single-meter and single-board products with small volume and simple structure, this condition can be directly used for environmental stress screening, but for single-machine level products with large size and composed of multiple components, directly inputting this incentive condition into the product installation site will It causes a large vibration difference of each part of the product, and the total root mean square value of the response in some parts of the product may even exceed 13grms, which will cause fatigue to the instrument and reduce the service life of the product

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