Optimal Design of the 4-cylinder Engine Rubber Mounts with Elastic Vibrations of Vehicle Body

차체의 탄성진동을 고려한 4기통 엔진 고무마운트의 최적설계

  • 박철희 (정회원, 인하대학교 기계공학과) ;
  • 오진우 (정회원, 인하대학교 대학원)
  • Published : 1998.01.01

Abstract

In this study, the objective is determine the optimal design variable of engine mount system using the rubber mount of bush-type which is usually utilized in passive control to minimize vibrations of vehicle body or transmission from engine into body. The engine model adopted in this study is 4-cylinder, 4-stroke gasoline engine support- ed by 4-points. The system is modelled in 10 d.o.f.-rigid body motion of the engine & transmission in 6 d.o.f., elastic motion of vehicle body in 4 d.o.f.(1st torsional, 1st vertical and 1st & 2nd lateral bending vibration mode). To consider the elastic motion of vehicle body, find the eigenvalues and mode shapes of vehicle body by nodal testing and then determine the modal masses and stiffnesses of the body. The design variables of the engine mount system are locations, stiffness and damping coefficients of the rubber mounts(28 design variables). In case of considering the torque-roll axis for the engine, the design variables of the mount system are reduced to 22 design variables. The objective functions in optimal design process are considered by three cases, that is, 1) transmitted forces through engine mounts, 2) acceleration components of generalized coordinates for the vibration of vehicle body, 3) acceleration of specified location(where gear box) of body. three case are analyzed and compared with each other.

Keywords

References

  1. Mech. Mach. Theory v.30 no.1 Vibration Isolation of a Mounted Engine through Optimization J. A. Snyman(et al.)
  2. Ford자동차 Design Guide Engine Mounts W. G. Roven;A. E. Petaja
  3. Design of Machinery Robert L. Norton
  4. 과학기술 자동차 공학 기술 대사전 日本 自動車 技術會
  5. Structural Vibration and Acoustics ASME v.DE-34 Dynamic Analysis of Engine-Mount System Hashem Ashrafiuon;C. Nataraj
  6. SAE 790221 Parameter Estimation Techniques for Modal Analysis D. L. Brown;R. J. Allemang;Ray Zimmerman
  7. Shock and Vibration Handbook(3rd ed.) Cyril M. Harris(et al.)
  8. 저소음 · 저진동 엔진설계를 위한 핵심기본기술개발-1차 중간보고서 박철희(외 다수)
  9. 저소음 · 저진동 엔진설계를 위한 핵심기본기술개발-2차 중간보고서 박철희(외 다수)