Road-test-research on braking dynamics led to the knowledge of global and local system-behaviour and to the wish to investigate local effects under defined and repeatable, but still real conditions. To meet all these requirements the quarter-car flat-surface test-stand 'EFA' with the ability to simulate vehicle dynamics of a quarter-car three-dimensionally was developed and built by the Automotive Engineering Department of Darmstadt University (fzd). Based on the principle of kinematic inversion a flexible power-drive belt made of polyamide coated with elastomer simulates the moving road surface with a micro-slip-characteristics like dry asphalt up to a maximum speed of 100 km/h. Realistic vertical excitation of the quarter-car with real suspension, body mass and ABS is possible by moving the wheel support under the belt with frequencies up to 25 Hz and amplitudes up to 40 mm. This concept enables to measure dynamic wheel load up to 15.000 N directly in the road. The research work presented here shows the necessity and advantage of a flat-surface test-stand for investigations on braking dynamics under real conditions and describes the concept for these investigations for the future.
Flat surface test-stand for investigations on braking dynamics
Ein ebener Teststand zur Erforschung der Bremsdynamik bei Kraftfahrzeugen
1993
15 Seiten, 14 Bilder, 1 Tabelle, 6 Quellen
Aufsatz (Konferenz)
Englisch
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