document: Design of a stroke dependent damper for the front axle suspension of a truck using multibody system dynamics and numerical optimization A stroke dependent damper is designed for the front axle suspension of a truck . The damper supplies extra damping for inward deflections rising above 4 cm . In this way the damper should reduce extreme suspension deflections without deteriorating the comfort of the truck . But the question is which stroke dependent damping curve yields the best compromise between suspension deflection working space and comfort . Therefore an optimization problem is defined to minimize the maximum inward suspension deflection subject to constraints on the chassis acceleration for three typical road undulations . The optimization problem is solved using sequential linear programming -LRB- SLP -RRB- and multibody dynamics simulation software . Several optimization runs have been carried out for a small two degree of freedom vehicle model and a large full-scale model of the truck semi-trailer combination . The results show that the stroke dependent damping can reduce large deflections at incidental road disturbances , but that the optimum stroke dependent damping curve is related to the acceleration bound . By means of vehicle model simulation and numerical optimization we have been able to quantify this trade-off between suspension deflection working space and truck comfort
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