Journal of the Korean Society of Manufacturing Process Engineers (한국기계가공학회지)

The Korean Society of Manufacturing Process Engineers (한국기계가공학회)
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A Study on Accelerated Fatigue Life Testing for Industrial Inverter

산업용 인버터의 가속 피로수명 평가에 관한 연구

  • Lee, Sanghoon (Department of Mechanical and Automotive Engineering, Keimyung University) ;
  • Kim, Won-Jin (Department of Mechanical and Automotive Engineering, Keimyung University)
  • 이상훈 (계명대학교 기계자동차공학부) ;
  • 김원진 (계명대학교 기계자동차공학부)
  • Received : 2022.04.14
  • Accepted : 2022.05.18
  • Published : 2022.06.30
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Abstract

Industrial inverters are used in a variety of fields for electric power supply. They may be exposed to vibration and heat once they are installed. This study focused on a framework of accelerated life testing of an industrial inverter considering fatigue damage as the primary source of deterioration. Instead of analyzing detailed failure mechanisms and the product's vulnerability to them, the potential of fatigue failure is considered using the fatigue damage spectrum calculated from the environmental vibration signals. The acceleration and temperature data were gathered using field measurement and spectral analysis was conducted to calculate the vibration signal's power spectral density (PSD). The fatigue damage spectrum is then calculated from the input PSD data and is used to design an accelerated fatigue life testing. The PSD for the shaker table test is derived that has the equivalent fatigue damage to the original input signal. The tests were performed considering the combined effect of random vibration and elevated temperature, and the product passed all the planned tests. It was successfully demonstrated that the inverter used in this study could survive environmental vibration up to its guarantee period. The fatigue damage spectrum can effectively be used to design accelerated fatigue life testing.

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References

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