SOME LIMITATIONS OF THE CHASSIS DYNAMOMETER IN VEHICLE SIMULATION

The chassis dynamometer is the standard tool for legislatively prescribed emission tests. For emission testing and many other vehicle test purposes the dynamic response is an adequate approximation to 'on road' conditions. This is not necessarily true if the requirement is to study vehicle driveline dynamics. The present analysis arose from two quite separate requirements to study driveline oscillations and 'judder' using chassis dynamometers of the same effective inertia as the vehicle. During the studies by the authors it became clear that the dynamics of the vehicle-dynamometer combination differ in important respects from those of a vehicle on the road. As the effective inertia of the dynamometer falls the natural frequency of the engine-drive line-vehicle system rises while the oscillatory energy imparted to the vehicle falls rapidly. For reasonably accurate simulation of driveline vibration the roll inertia should be some five times that of the vehicle. It is shown that electrical simulation of inertia, as employed in most modern chassis dynamometers, is unsatisfactory where oscillatory phenomena are being studied. (A)

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• Authors:
  • PLINT, M A
  • MARTYR, A J
• Publication Date: 2001

Language

• English

Media Info

• Pagination: p. 431-7
• Serial:
  • Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering
  • Volume: 215
  • Issue Number: D3
  • Publisher: Sage Publications Limited
  • ISSN: 0954-4070
  • EISSN: 2041-2991
  • Serial URL: http://pid.sagepub.com/content/current

Subject/Index Terms

• TRT Terms: Force; Inspection; Measuring instruments; Motor vehicles; Pollutants; Simulation; Vibration
• ITRD Terms: 6155: Apparatus (measuring); 2442: Emission; 5421: Force; 9103: Simulation; 1575: Vehicle inspection; 5558: Vibration
• Subject Areas: Environment; Vehicles and Equipment;

Filing Info

• Accession Number: 00816135
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD
• Created Date: Sep 7 2001 12:00AM