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| Random Vibration Failure Analysis of an Electronic Equipment |
| Received:May 10, 2021 Revised:July 28, 2021 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2021.10.018 |
| KeyWord:electronic equipment random vibration finite element method PSD resonance failure recurrence |
| Author | Institution |
| WANG Chong-zhe |
The 29th Research Institute of CETC, Chengdu , China |
| LIU Jie |
The 29th Research Institute of CETC, Chengdu , China |
| CHENG Hao-yue |
The 29th Research Institute of CETC, Chengdu , China |
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| Abstract: |
| In order to analyze the causes of failure in random vibration test of electronic equipment. Firstly, the environmental test of electronic equipment was analyzed, it was determined that the screws were arranged reasonably and the structure had no obvious defects, but the test fixture might lead to the amplification of vibration load. Use ABAQUS, a finite element software, to analyze the failure of electronic equipment, in the meanwhile, through tests to determine the frequency of the test fixture, and drew the actual PSD (power spectrum density) curve of the random vibration, a finite element simulation was finished which take the PSD curve as input. On this basis, the failure recurrence test was completed, and the corresponding improvement measures were formulated. The 3sigma stress of the electronic equipment was 22 MPa by finite element simulation, which was within the allowable range of structural strength. The frequency of the test fixture were repeated with the frequency of the electronic equipment, and the vibration load was amplified due to resonance, thus the electronic equipment was damaged. Taking the actual PSD curve as input, the simulation results showed that 3sigma stress is 52 MPa, which exceeded the welding strength, leading to the failure of the solder joint. In order to further verify that the failure reason was the amplification of the vibration load by the test fixture, the original test fixture was used to complete the failure recurrence test, and the fixture was improved to carry out the comparative test. The design of the test fixture should avoid the same frequency between the fixture and the electronic equipment, which will lead to the damage of the electronic equipment caused by resonance, a reasonable design of test fixture can effectively avoid the electronic equipment from excessive testing. |
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