A THEORETICAL AND PRACTICAL EXAMINATION OF ENGINE SHAKE

The object of the present work was to put engine shake on a firmer theoretical basis. The engine was considered as a rigid mass with three translational and three rotational degrees of freedom. The analysis was not confined to simply predicting the resonant frequencies of the system but also to the complete frequency response. Inputs to the engine were taken to be via the engine mounts. To cater for a fully general case typical of actual conditions the inputs at each engine mount were taken as three independent sine wave displacements of equal frequency. A computer program was developed to predict the response of the engine at its centre of gravity and at the engine mounting points. The computer program was supplied with the various data and produced the frequency response of the engine. This was compared with the measured frequency response and reasonable agreement was obtained. Having validated the method the effects of varying the mount stiffness and positions were examined, and in particular a mounting system based on the concept of the centre of percussion was examined. Some improvement over the existing system was observed. The technique developed could be used to optimise a mounting system, and to help towards minimising the effects of engine shake on the occupants of A vehicle. /TRRL/

Media Info

  • Features: Figures; References;
  • Pagination: p. 413-437

Subject/Index Terms

Filing Info

  • Accession Number: 00137804
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • ISBN: 0 85334 642 9
  • Report/Paper Numbers: Proceeding
  • Files: ITRD, TRIS
  • Created Date: Apr 27 1977 12:00AM