Analysis of Practical Dynamic Force of Structure with Inverse Problem

역문제에 의한 구조물의 실동하중 해석

  • 송준혁 (전북대학교 자동차산학협력원) ;
  • 노홍길 (전북대학교 대학원 정밀기계공학) ;
  • 김홍건 (전주대학교 공학부 기계공학) ;
  • 유효선 (전주전주대학교 기계항공시스템공학부, 자동차신기술연구센터대) ;
  • 강희용 (전주대학교 기계항공시스템공학부, 자동차신기술연구센) ;
  • 양성모 (전주대학교 기계항공시스템공학부, 자동차신기술연구센터)
  • Published : 2004.04.01

Abstract

Vehicle structures are composed of many substructure connected to one another by various types of mechanical joints. In vehicle engineering it is important to study these connected structures under various dynamic forces for the evaluations of fatigue life and stress concentration exactly. It is difficult to obtain the accurate load history of specified positions because of the errors such as modeling, measurement and etc. In the beginning of design exact load data are actually necessary for the fatigue strength and life analysis to minimize the cost and time of designing. In this paper, the procedure of practical dynamic force determination is developed by the combination of the principal stresses of F. E. Analysis and experiment. Least square pseudo inverse matrix is adopted to obtain in inverse matrix of analyzed stresses matrix. The error minimization method utilizes the inaccurate measured error and the shifting error that the whole data is stiffed over real data. The least square criterion is adopted to avoid these non. Finally, to verify the proposed procedure, a bus is analyzed. This measurement and prediction technology can be extended to the structural modification of any geometric shape in complex structure.

Keywords

References

  1. ASCE Journal of Engineering Mechanics v.115 no.11 Adaptive Modeling, Identfication and Control of Dynamic Structural System (Ⅰ) Theory Safak,E. https://doi.org/10.1061/(ASCE)0733-9399(1989)115:11(2386)
  2. Experimental Mechanics v.24 An Experimental Method for Determining the Dynamic Contact Law Doyle,J.F. https://doi.org/10.1007/BF02323199
  3. Journal of Sound and Vibration v.97 no.1 Remote Impact Analysis by use of Propgated Acceleration Signals. Ⅰ: Theoretical Methods Whitson,G.S. https://doi.org/10.1016/0022-460X(84)90465-6
  4. Journal of Applied Mechanics v.53 no.1 Determination of Dynamic Forces from Wave Moton Measurements Michaels,J.E.;Pao,Y.H. https://doi.org/10.1115/1.3171740
  5. Journal of Korean Society of Steel Construction v.7 no.3 Inverse Problem in Structural Engineering Shin,S.B.
  6. Journal of Korean Society of Mechanical Engineers v.24 no.7 Inverse Analysis Approach to Flow Stress Evaluation by Small Punch Test Cheon,J.S.
  7. Journal of Korean Society of Mechanical Engineers v.19 no.3 Impact Force Reconstruction and Impact Model Identification Using Inverse Dynamics of an Impacted Beam Park,H.S.;Park,Y.S.
  8. Proceedings of the Korean Society of Machine Tool engineers, Fall Conference Analysis of Torque on Spur Gear by Inverse Problem Lee,J.K.;Woo,C.K.;Kim,B.K.;Yoon,J.H.;Park,S.W.;Ihn,S.H.
  9. International Conference on Vehicle Structure, IMech Conference Publications 1984-7 Laboratory Methods for Evaluating Car Body Structures-Dynamics and Durability Performance, Vehicle Structures Singh,B.
  10. Proceedings of the SAE Fatigue Conference P-109, Society of Automotive Engineers, fatigue Conference & exposition Design Validation Testing Jaeckel,H.R.
  11. Transactions of the Korean Society of Machine Tool Engineers v.10 no.2-5 Dynamic Stress Analysis of Joint by Practical Dynamic Load History Song,J.H.;Yang,S.M.;Kang,H.Y.;Simamoto,A.