Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
권호 표지

Analysis of Ride Comfort for an Automobile with flexible Vehicle Body

차체의 유연성을 고려한 차량 승차감 해석

  • Kim Junghoon (School of Mechanical and Aerospace Engineering, Seoul National University) ;
  • Choi Kwangsung (School of Mechanical and Aerospace Engineering, Seoul National University) ;
  • Park Sungyong (School of Mechanical and Aerospace Engineering, Seoul National University) ;
  • Lee Jangmoo (School of Mechanical and Aerospace Engineering, Seoul National University) ;
  • Kang Sangwook (Department of Mechanical Systems Engineering, Hansung University) ;
  • Kang Juseok (GM Daewoo Auto & Technology)
  • 김정훈 (서울대학교 기계공학부) ;
  • 최광성 (서울대학교 기계공학부) ;
  • 박성용 (서울대학교 기계공학부) ;
  • 이장무 (서울대학교 기계공학부) ;
  • 강상욱 (한성대학교 기계시스템공학과) ;
  • 강주석 (지엠대우오토앤테크놀로지㈜)
  • Published : 2005.07.01
Download PDF
⟨ Previous Next ⟩

Abstract

In most researches on the ride comfort analysis of passenger vehicles, the flexibility of the vehicle body has been not considered as an important factor, because the resonance frequencies of the vehicle body related to pitching, yawing and rolling motions are below 10Hz while the resonance frequencies of the vehicle body related to the flexibility are above 20Hz approximately. Nevertheless, the paper shows that the consideration of the local flexibility (or local stiffness) of the 4 corners on which shock absorbers are mounted influences the ride comfort. A simple beam model is devised to qualitatively examine the effect of the change of the local stiffness of the vehicle body on the ride comfort. Based on the results obtained from the analysis of the one-dimensional model, multi-body dynamic analysis considering the flexibility of the vehicle body is performed using ADAMS and MSC/NASTRAN. Natural frequencies and mode shapes computed by MSC/NASTRAN are used as input data for multi-body dynamic analysis in ADAMS. Through simulations using ADAMS, it has been found that the ride comfort can be improved by changing the local stiffness of the vehicle body and that the simulation results agree with experiment results.

Keywords

References

  1. S. S. Kim, S. B. Lee, H. K. Jung and H. S. Son, 'Vehicle Ride and Handling Simulation with Flexible Car Body,' Spring Conference of Proceeding, KSAE, pp.805-812, 2002
  2. K. S. Kim, W. S. Yoo, K. H. Lee and K. T. Kim, 'Effect of Chassis Flexibility on Ride Quality,' Transactions of KSAE, Vol.4, No.2, pp.127-136, 1996
  3. S. B. Lee, 'Flexibility Effects of Frame for Vehicle Dynamic Characteristics,' Transaction of the KSMTE, Vol.11, No.2, pp.80-86, 2002
  4. Klaus - Jurgen Bathe, Finite Element Procedures, Prentice - Hall International Editions, 1996
  5. H. G. Choi, S. W. Yoo, J. D. Jeong and J. M. Lee, 'Acoustic Characteristics of Annular Cavities with Locally Non-uniform Media,' Journal of Sound and Vibration 266, 2003
  6. M. J. Maurizi, R. E. Rossi and J. A. Reyes, 'Vibration Frequencies for a Uniform Beam with One End Spring-Hinged and Subjected to a Translational Restraint of the Other End,' Journal of Sound and Vibration, Vol.48, pp.565-568, 1976 https://doi.org/10.1016/0022-460X(76)90559-9
  7. Leonard Meirovitch, Elements of Vibration Analysis, Mcgraw-Hill International Editions, Mechanical Engineering Series, 1986
  8. T. D. Gillespie, Fundamentals of Vehicle Dynamics, SAE, Inc., 1992
  9. MSCINASTRAN User' Manual, MSC, 1989
  10. J. H. Lee, 'Vibration Analysis of a Vehicle Body Considering High Frequency Characteristics of a Suspension System,' Ph.D. Thesis, Seoul National University, 1997
  11. ADAMS User' Manual, Mechanical Dynamics Inc., May, 1994