Journal of the Korea Institute of Military Science and Technology (한국군사과학기술학회지)

The Korea Institute of Military Science and Technology (한국군사과학기술학회)
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The Study of Hinge Moment Measurement in Wind Tunnel Test Using Single Wheatstone Bridge Flexure

단일 휘트스톤 브리지 플렉셔를 이용한 풍동시험에서의 힌지모멘트 측정 연구

  • Cho, Cheolyoung (The 1st Research and Development Institute, Agency for Defense Development) ;
  • Park, Jongho (Department of Mechanical Engineering, Chungnam National University)
  • 조철영 (국방과학연구소 제1기술연구본부) ;
  • 박종호 (충남대학교 기계공학과)
  • Received : 2015.12.23
  • Accepted : 2016.07.08
  • Published : 2016.08.05
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Abstract

In this study, a method using single Wheatstone bridge flexure has been presented to measure hinge moment acting on control surfaces of wind tunnel models. The structural simplicity of the flexure reduces difficulty regarding gauging and wire-routing, and also makes it feasible to install flexures even inside thin wings. Some flexures were designed and fabricated under typical aerodynamic loads in wind tunnel test, and the strains on the flexure according to applied loads were compared with the result of the analysis by finite element method. The relation between applied loads and output signals showed good linearity, and the standard deviation on the residual errors from linear equation obtained by least square method was within 1.0 % of the maximum design moments. In addition, the FEM analysis on the thickness of load-connecting part of the flexure showed that the sensitivity was improved as the thickness became thin as much as desired to avoid buckling.

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References

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