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Investigation of Error Factors from an Impact Hammer Test for Developing a Statistic Based Technique for Model Updating

통계 기반 모델 개선을 위한 임팩트 해머 실험의 오차 요인 분석

Lee, Su;Lee, Jin Woo
이수;이진우

  • Received : 2015.09.17
  • Accepted : 2015.11.16
  • Published : 2016.02.01

Abstract

In this work, experimental errors from an impact hammer test were investigated to develop a statistic-based technique for updating a finite element model. Digital signal processing was analyzed by using theoretical models and experiments when errors occurred during the experimental procedure. First, the duration time and peak level of the excitation signal, the stiffness and position of elastic springs connecting the specimen as well as the support, position and mass of the accelerometer were considered as error factors during the experiment. Then the picket fence effect, leakage, and exponential window function were considered as candidate error factors during the digital signal processing. Finally, methods to reduce errors are suggested.

Keywords

Finite Element Analysis;Impact Hammer Test;Uncertainty;Frequency Response Function;Natural Frequency

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Acknowledgement

Grant : 모듈형 시스템설계를 위한 플러그인 디지털 해석 프레임 워크 개발

Supported by : 산업통상 자원부