INVARIANT PROPERTIES OF AUTOMOTIVE SUSPENSIONS
Dynamic systems which are composed of interconnected sub-systems are subject to dynamic 'constraint equations' which are independent of the nature of the interconnections. A dynamic constraint equation is developed for a quarter car model of an automotive suspension. It is shown that only one of the three transfer functions (acceleration, suspension deflection and tyre deflection) can be independently specified and that the first two contain 'invariant points' at frequencies within the frequency range of interest. These constraint equations lead to conclusions with respect to trade-offs between the three transfer functions. Improvements in all three can be obtained near the unsprung natural frequency; however, severe trade-offs are shown to exist at all other frequencies. (A) (Author/TRRL)
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Corporate Authors:
Mechanical Engineering Publications Limited
P.O. Box 24, Northgate Avenue
Bury St Edmunds, Suffolk IP32 6BW, England -
Authors:
- Hedrick, J Karl
- BUTSUEN, T
- Conference:
- Publication Date: 1990
Language
- English
Media Info
- Pagination: p. 21-7
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Serial:
- Volume: 204
- Issue Number: D1
Subject/Index Terms
- TRT Terms: Automobiles; Deceleration; Deflection; Dynamics; Heat transfer; Mathematical models; Natural frequency; Scale models; Structural models; Suspension systems; Tires; Transfer characteristics; Vehicles
- ITRD Terms: 5405: Acceleration; 1243: Car; 8525: Conference; 5416: Deceleration; 5586: Deflection; 9011: Design (overall design); 5473: Dynamics; 6473: Mathematical model; 6205: Model (not math); 5549: Natural frequency; 1329: Suspension (veh); 6731: Transfer (phys); 1381: Tyre; 1255: Vehicle
- Subject Areas: Bridges and other structures; Vehicles and Equipment;
Filing Info
- Accession Number: 00612486
- Record Type: Publication
- Source Agency: Transport and Road Research Laboratory (TRRL)
- Files: ITRD, TRIS
- Created Date: Aug 31 1991 12:00AM