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/

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0853346429
• Supplemental Notes:
  • Papers presented at the Annual Conference of the Stress Analysis Group of the Institute of Physics held at the University of Ashton, Birmingham, England.
• Corporate Authors:

  Applied Science Publishers Limited

  22 Rippleside Commercial Estate, Ripple Road
  Barking, Essex,   England 

  John Wiley & Sons, Incorporated

  111 River Street
  Hoboken, NJ  United States  07030-6000
• Authors:
  • Eames-Jones, A
  • ASHLEY, C
  • Gibbs, H G
  • Richards, T H
• Conference:
  • Papers presented at the Annual Conference of the Stress Analysis Group of the Institute of Physics held at the University of Ashton, Birmingham, England.
• Publication Date: 1975

Language

• English

Media Info

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

Subject/Index Terms

• TRT Terms: Comfort; Computer programs; Conferences; Engines; Experiments; Forecasting; Frequency response; Motors; Resonance frequency; Structural analysis; Theory; Vehicle occupants; Vehicles; Vibration
• Old TRIS Terms: Mounting; Shaking
• ITRD Terms: 1057: Air transport network; 9138: Comfort; 8525: Conference; 3840: Installation; 1334: Motor; 8645: Software; 5573: Stress analysis; 9078: Theory; 1715: Vehicle occupant; 5558: Vibration
• Subject Areas: Highways; Passenger Transportation; Safety and Human Factors; Vehicles and Equipment; I91: Vehicle Design and Safety; I92: Vehicle Comfort;

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