ICF13B

13th International Conference on Fracture June 16–21, 2013, Beijing, China -7- high-speed vehicle. And their correlation coefficients are greater than 0.5, can be thought as significant correlation. Since there exist many non-linear factors, such as wheel-rail contact geometry and creep effects, which not only must be taken into account in high-speed train modeling but also make the estimation process of the wheel-rail lateral contact forces are more complex than the vertical contact forces. More research is needed to expand the inverse model which considers the non-linear factors between the wheel and rail. Furthermore, the next step will involve field trial tests to verify the effectiveness of the inverse model. Acknowledgements This work was supported in part by the National Natural Science Foundation of China (51275432); National Key Technology R&D Program in the 11th Five year Plan of china (2009BAG12A04-A11); University Doctor Academics Particularly Science Research Fund (SWJTU09ZT23). References [1] T. Zhu, S. N. Xiao, and G. W. Yang, State-of-the-art development of load identification and its application in study on wheel-rail forces. Journal of the China Railway Society, 33 (2011) 29-36. (Chinese). [2] K. K. Stevens, Force identification problems-an overview. In: Proceedings of SEM Spring Meeting, Houston, (1987) 838–844. [3] B. J. Dobson, E. Rider, A review of the indirect calculations of excitation forces from measured structural response data. Proc. Inst. Mech. Engrs.: J. Mech. Engrg. Sci., 204 (1990) 69-75. [4] L. J. L. Nordstrom, T. P. Nordberg, A critical comparison of time domain load identification methods. In: Proceedings of the Sixth International Conference on Motion and Vibration Control, 2 (2002) 1151-1156. [5] J. Giergiel, T. Uhl, Identification of impact forces in mechanical systems. Arch. Mach. Des., 36 (1989) 321-336. [6] J. Giergiel, and T. Uhl, Identification of the input excitation forces in mechanical structures. Arch. Transp., 1 (1989)8-24. [7] B. J. Dobson, E. Rider, A review of the indirect calculation of excitation forces from measured structural response data. J. Mech. Eng. Sci. , 204 (1990) 69-75. [8] T. Uhl, J. Pieczara, Identification of operational loading forces for mechanical structures. Arch. Transp. ,16 (2003) 109-126. [9] S. Lechowicz, C. Hunt, Monitoring and managing wheel condition and loading. In: Proceeding of International Symposium for transportation recorders, Arlington, (1999)205-239. [10] J. Nielsen, A. Johansson, Out of round railway wheels-literature curve. In: Proceedings Of the Institute of Mechanical Engineers – part F, 214 (2002) 79-91. [11] A. Chudzikiewicz, Selected elements of the contact problems necessary for investigating the rail vehicle system. In: Kisilowski, J., Knothe, K. (eds.) Advanced railway vehicle system dynamics, WNT, Warszawa, 1991. [12] A. Chudzikiewicz, Elements of vehicle diagnostics. ITE, Radom, 2002. [13] P. C. Hansen, Analysis of discrete ill-posed problems by means of the L-curve. SIAM Rev. , 34(1992) 561-580.

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