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Fatigue Life Evaluation in Frequency Domain of aircraft Equipment Exposed to Random Vibration

무작위 진동에 노출된 항공기 탑재 장비의 주파수영역 피로수명 평가

  • Jung, Hyun Su (Mechanical R&D Laboratory, LIG Nex1 Co., Ltd.) ;
  • Kim, Ki Seung (Mechanical R&D Laboratory, LIG Nex1 Co., Ltd.) ;
  • Kim, Jun Su (Mechanical R&D Laboratory, LIG Nex1 Co., Ltd.) ;
  • Lee, Seong Woo (The 3 rd Research and Development Institute, Agency for Defense Development)
  • Received : 2017.02.22
  • Accepted : 2017.06.30
  • Published : 2017.08.01

Abstract

Expecting fatigue life of mounted radar in aircraft is very important when designing, because the mounted radar in aircraft is exposed to long-term external random vibration. Among the methods of predicting the fatigue life, Fatigue analysis method in frequency domain has continuously been proposed in this field. In this paper, four fatigue analysis methods in frequency domain, which are widely used, have been selected and compared with the results for Specimen fatigue test. As a result, Dirlik and Benascicutti-Tovo methods have been matched better with fatigue analysis in time domain than the method in frequency method through the comparison between the fatigue analysis method in time domain and the method in frequency domain by conducting the specimen fatigue test with strain gage. Based on the results of the specimen fatigue test, We have conducted fatigue analysis of mounted radar in aircraft with Dirlik and Benasciutti-Tovo methods in the finite element model, and confirmed that the required life was satisfying.

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