A simple linear dynamic model was built to investigate the influence of the whole vehicle behaviour on the response of the suspension at one location. The purpose of the investigation was twofold. Firstly to investigate whether a suspension based assessment of road friendliness was adequate or whether the influence of whole vehicle effects meant that only a whole vehicle assessment was meaningful. Secondly if a suspension test for road-friendliness were conducted with the suspension fitted to a real vehicle what strategies could be applied to minimise the influence of whole vehicle effects on the results. The analysis showed that whole vehicle effects did influence the response of the suspension significantly. However, several of these effects, vehicle speed, Cg position and pitch inertia vary with operating conditions and so a whole vehicle assessment in a particular configuration is no more use than a suspension-by-suspension assessment. The stiffness and damping of the suspension at the other end of the vehicle did influence the response of the suspension under consideration. In fact, an improvement in the road friendliness of the other suspension can result in an increase in dynamic loads from the suspension being assessed. However, the dynamic loads of the vehicle as a whole reduced. Again there was no reason to expect that a combination of the assessments of the individual suspenions would not provide an appropriate ranking. A method for combining these assessments was proposed. Finally a review of the findings was used to deduce a strategy for suspension testing which would minimise the influence of whole vehicle effects on the results. This strategy is straightforward. The vehicle should be loaded so that the Cg is as close as possible to the suspension being tested. A minimum value for the inertia ratio, which control the pitch inertia, may need to be set. Some measurement of actual vehicles is needed to determine appropriate practical numerical values for these parameters.
Suspensions or whole vehicles? Rating road-friendliness
Bewertung der Straßentauglichkeit: Fahrwerk oder gesamtes Fahrzeug?
Heavy Vehicle Systems ; 6 , 1-4 ; 75-98
1999
24 Seiten, 26 Bilder, 8 Quellen
Aufsatz (Zeitschrift)
Englisch
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