Dimensional Analysis for the Front Chassis Module in the Auto Industry

자동차 프런트 샤시 모듈의 좌표 해석

  • 이동목 (경북대학교 대학원 기계공학과) ;
  • 양승한 (경북대학교 기계공학부)
  • Published : 2004.08.01

Abstract

The directional ability of an automobile has an influence on driver directly, and hence it must be given most priority. Alignment factors of automobile such as the camber, caster and toe directly affect the directional ability of a vehicle. The above mentioned factors are determined by the pose of interlinks in the assembly of an automobile front chassis module. Measuring the position of center point of ball joints in the front lower arm is very difficult. A method to determine this position is suggested in this paper. Pose estimation for front chassis module and dimensional evaluation to find the rotational characteristics of front lower arm were developed based on fundamental geometric techniques. To interpret the inspection data obtained for front chassis module, 3-D best fit method is needed. The best fit method determines the relationship between the nominal design coordinate system and the corresponding feature coordinate system. The least squares method based on singular value decomposition is used in this paper.

Keywords

References

  1. Horn, B. K. P., 'Closed-form solution of absolute orientation using orthonormal matrices,' J. Opt. Soc. Am. Ser. A, Vol. 5, pp. 1127-1135, 1987 https://doi.org/10.1364/JOSAA.5.001127
  2. Arun, K. S., Huang, T. S., Blostein, S. D., 'Least-squares fitting of two 3-D point sets,' IEEE Trans. Pattern Anal. Machine Intell., Vol. PAMI-9, pp. 698-700, 1987 https://doi.org/10.1109/TPAMI.1987.4767965
  3. Horn, B. K. P., 'Closed-form solution of absolute orientation using unit quaternions,' J. Opt. Soc. Am. Ser. A, Vol. 4, pp. 629-642, 1987 https://doi.org/10.1364/JOSAA.4.000629
  4. Eggert, A. W., Lorusso, A., and Fisher, R. B., 'Estimating 3-D rigid body transformations: a comparison of four major algorithms,' Machine Vision and Application, Vol. 9, pp. 272-290, 1997 https://doi.org/10.1007/s001380050048
  5. Umeyama, S., 'Least-squares estimation of transformation parameters between tow point patterns,' IEEE Trans. Pattern Anal. Machine Intell., Vol. 13, pp. 376-380, 1991 https://doi.org/10.1109/34.88573
  6. Kanatani, K., 'Analysis of 3-D rotation fitting,' IEEE Trans. Pattern Anal. Machine Intell., Vol. 16, pp. 543-549, 1994 https://doi.org/10.1109/34.291441
  7. Samuel, G. L., Yang, S. H., 'Determination and mapping of measurement and design coordinate systems using computational geometric techniques,' International Journal of Advanced Manufacturing Technology, Accepted, 2003 https://doi.org/10.1007/s00170-003-2052-9
  8. Schonemann, P., 'A generalized solution of the orthogonal procrustes problem,' Psychometrika, Vol. 31, pp. 1-10, 1966 https://doi.org/10.1007/BF02289451
  9. Yau, H. T., Menq, C. H., 'A unified least squares approach to the evaluation of geometric errors using discrete measurement data,' International Journal of Machine Tools and Manufacture, Vol. 36, pp. 126-1290, 1996 https://doi.org/10.1016/0890-6955(95)00075-5