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Analysis System for Practical Dynamic Load with Hybrid Method under Random Frequency Vibration  

Song, Joon-Hyuk (Jeonju Machineary Research Center)
Yang, Sung-Mo (Department of Mechanical & Aerospace System Engineering, Chonbuk National University, Research Center of Industrial Technology, Chonbuk National University)
Kang, Hee-Yong (Department of Mechanical & Aerospace System Engineering, Chonbuk National University, Research Center of Industrial Technology, Chonbuk National University)
Yu, Hyo-Sun (Department of Mechanical & Aerospace System Engineering, Chonbuk National University, Research Center of Industrial Technology, Chonbuk National University)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.16, no.6, 2008 , pp. 33-38 More about this Journal
Abstract
Most structures of vehicle are composed of many substructures connected to one another by various types of mechanical joints. In vehicle engineering, it is important to study these jointed structures under random frequency vibration for the evaluations of fatigue life and stress concentration exactly. It is rarely obtained the accurate load history of specified positions in a jointed structure 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 hybrid method of practical dynamic load determination is developed by the combination of the principal stresses from F. E. Analysis and test of a jointed structure. Least square pseudo inverse matrix is adopted to obtain an 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 errors. Finally, to verify the proposed system, a heavy-duty bus is analyzed. This measurement and prediction technology can be extended to the different jointed structures.
Keywords
Practical dynamic load; Quasi-static analysis; Hybrid method; Inverse problem; F. E. Analysis;
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  • Reference
1 M. R. Khan and K. D. Wilmert, "Finite Element Quasi-Static Deformation Analysis of Planar Mechanism with External Loads Using Static Condensation," ASME No.81-DET-104, 1981
2 S. M. Yang, H. Y. Kang, J. H. Song and J. M. Park, "Prediction of Life of SAPH45 Steel with Measured Fracture Time and Strength," KSMTE, pp.269-273, 1998
3 J. R. Sanders and D. Tesar, "The Analytical and Experimental Evaluation of Vibratory Oscillations in Realistically Proportioned Mechanisms," ASME, 78-DE-1, 1978
4 S. M. Yang, H. Y. Kang, D. W. Kim, J. H. Song, K. J. Kim, H. I. Park, Y. S. Hwang and B. W. Hwang, "A Computational Method For Dynamic Load of T-Shape Joint Based on Static Test and Finite Element Analysis," SEM IX International Congress & Exposition on Experimental Mechanics, 2000
5 J. H. Song, K. J. Kim, H. I. Park, H. Y. Kang, D. W. Kim and S. M. Yang, "A Study on the Practical Load with T-shape Joint Structure by the FEA," Transactions of KSAE, Vol.9, No.2, pp.107-115, 2001
6 B. Singh, "Laboratory Methods for Evaluating Car Body Structures-Dynamics and Durability Performance," Vehicle Structures, International Conference on Vehicle Structure, IMech Conference Publications 1984-7, The Institution of Mechanical Engineers, Cranfield Institute of Technology, pp.115-120, 1984
7 H. R. Jaeckel, "Design Validation Testing," Proceedings of the SAE Fatigue Conference P-109, Society of Automotive Engineers, Fatigue Conference & Exposition, Dearborn, Michigan, pp.153-159, 1982