Journal of the Korean Society for Precision Engineering (한국정밀공학회지)

Korean Society for Precision Engineering (한국정밀공학회)
권호 표지

A Study on the Dynamic Stress Analysis of an Engine Block using Flexible-body Dynamic Analysis

유연체 동역학적 해석을 이용한 엔진블록의 동응력 해석에 관한 연구

  • Son, Chang-Su (Department of Mechanical Engineering, Changwon National Univ.) ;
  • Cheon, Ho-Jeong (Department of Mechanical Engineering, Changwon National Univ.) ;
  • Seong, Hwal-Gyeong (Department of Naval Architecture and Marine Engineering, Changwon National Univ.) ;
  • Yoon, Keon-Sik (Department of Naval Architecture and Marine Engineering, Changwon National Univ.)
  • 손창수 (창원대학교 기계공학과) ;
  • 천호정 (창원대학교 기계공학과) ;
  • 성활경 (창원대학교 조선해양공학과) ;
  • 윤건식 (창원대학교 조선해양공학과)
  • Received : 2011.01.14
  • Accepted : 2011.04.02
  • Published : 2011.07.01
Download PDF
⟨ Previous Next ⟩

Abstract

The dynamic stress of the diesel engine block is analyzed by using flexible-body dynamic analysis. Multiple loadings including the pressure load due to gas combustion, thermal load, and dynamic load are considered. Thermal load is assumed constant, however, pressure load and dynamic load are treated as time dependent. The present work is focused on the dynamic stress analysis, especially on finding critical points of the engine block. The analysis model includes four parts - engine block, generator, bed, and mounts. On the other hand, crank shaft, pistons, and main bearings are excluded from the model. However, their dynamic effects are applied by dynamic forces, obtained in the separate analysis. Dynamic stress is found by using flexible body dynamic analysis, and compared to the measured data.

Keywords

References

  1. Frimpong, S. and Li, Y., "Stress Loading of the cable shovel boom under in-situ digging conditions," Engineering Failure Analysis, Vol. 14, No. 4, pp. 702-715, 2007. https://doi.org/10.1016/j.engfailanal.2006.02.007
  2. Yilmaz, Y. and Anlas, G., "An investigation of the effect of counterweight configuration on main bearing load and crankshaft bending stress," Advances in Engineering Software, Vol. 40, No. 2, pp. 95-104, 2009. https://doi.org/10.1016/j.advengsoft.2008.03.009
  3. Lee, J. O., Seong, H. G. and Cheon, H. J., "The Shape Optimal Design of Marine Medium Speed Diesel Engine Piston," Journal of the Korean Society for Precision Engineering, Vol. 25, No. 9, pp. 59-70, 2008.
  4. Seo, J.-H., Jung, I.-H. and Park, T.-W., "Computation of Dynamic Stress in Flexible Multi-body Dynamics Using Absolute Nodal Coordinate Formulation," Journal of the Korean Society for Precision Engineering, Vol. 21, No. 5, pp. 114-121, 2004.
  5. Yim, H.-J. and Lee, S.-B., "An Integrated CAE System for Dynamic Stress and Fatigue Life Prediction of Mechanical Systems," Journal of the Korean Society for Precision Engineering, Vol. 10, No. 2, pp. 158-168, 1996.
  6. Ryu, J.-H., Kim, H.-S. and Yim, H.-J., "An efficient and accurate dynamic stress calculation by flexible multibody dynamic system simulation and reanalysis," International Journal of the KSME, Vol. 11, No. 4, pp. 386-396, 1997. https://doi.org/10.1007/BF02945077
  7. Shabana, A. A., "Computer Implementation of the Absolute Nodal Coordinate Formulation for Flexible Multibody Dynamics," Nonlinear Dynamics, Vol. 16, No. 3, pp. 293-306, 1998. https://doi.org/10.1023/A:1008072517368
  8. Mourelatos, Z. P. "A crankshaft system model for structural dynamic analysis of internal combustion engines Original Research Article," Computers & Structures, Vol. 79, No. 20-21, pp. 2009-2027, 2001.
  9. Haug, E. J., "Computer-Aided Kinematics and Dynamics of Mechanical System," Prentice Hall College Div., pp. 218-230, 1989.
  10. Barlow, J., "Optimal stress locations in finite element models," International Journal for Numerical Methods in Engineering, Vol. 10, No. 2, pp. 243-251, 1976. https://doi.org/10.1002/nme.1620100202