LI Zhenping, LI Hua. Research on random vibration fatigue of high-voltage electrical box based on FKM standard[J]. Electric Drive for Locomotives,2023(3): 104-111.
LI Zhenping, LI Hua. Research on random vibration fatigue of high-voltage electrical box based on FKM standard[J]. Electric Drive for Locomotives,2023(3): 104-111. DOI: 10.13890/j.issn.1000-128X.2023.03.106.
Research on random vibration fatigue of high-voltage electrical box based on FKM standard
The high voltage electrical boxes on metro vehicles are subjected to random load during operation. In order to ensure operation safety
it is necessary to ensure that the fatigue strength of high voltage electrical box meets the design requirements. Aiming at the problem of aluminum plate mounting bolts at the three-position switch of the high voltage electrical box become loose during the operation of a metro vehicle
the fatigue strength of the high voltage electrical box is evaluated according to the standard load and FKM provided in GB/T 21563—2018 standard. The calculation results show that the fatigue strength utilization of aluminum plate is greater than 1
and the fatigue strength cannot meet the requirements of standard FKM. Through the impact test of the high voltage electrical box
in the longitudinal random vibration
the aluminum plate cracked and the bolts become loose
which verified the accuracy of the longitudinal random vibration simulation results. Based on the simulation and test results
the structure of the high voltage electrical box is improved. After the improvement
the fatigue strength of the high voltage electrical box meets the design requirements.
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