Abstract
Paper discusses apparently opposing goal functions in terms of car’s comfort and handling. Short descriptions of passive, semi-active and active suspensions with their features are included. Thereafter, employing a two-mass quarter car model, an idea of damping control strategy in semi-active car suspension is presented. The results of performed simulation tests for various inputs are depicted and thoroughly discussed with comparison to classical passive suspension’s response. On the grounds of obtained results, conclusions are formulated. What is more, a layout of further work is outlined, with the aim of system’s response optimization in terms of comfort and handling features, as well as reliable validation of efficiency of proposed damping control strategy.
Highlights
The suspension issue was already considered in the times of horse-drawn carriages
According to mentioned semi-active suspension merits and active suspension drawbacks, authors of this paper focused on the first type
The second remark which comes from Eq (2) is that when both terms of the equation take opposite signs, there is a theoretical possibility to neutralize forces acting on a chassis, so accelerations too
Summary
The suspension issue was already considered in the times of horse-drawn carriages. Just as in power units, a tremendous progress has been done in the field of suspensions. The sophisticated issue is complicated due to a change of the sprung mass in dependence of current vehicle’s load In passive suspensions there are (nearly) constant values of damping and spring stiffness, set during manufacturing process Those values are a compromise between comfort, handling and predicted changes of sprung mass, as a result of car’s authorized payload. In semi-active suspensions shock-absorber has a variable damping coefficient, which in dependence of design’s advancement can have two or several stages of damping or may change continuously This change of damping can be done on driver request (e.g. sport/comfort mode) or in autonomous way, based on set of sensors which are employed to on-line analysis of the road profile. Their properties change in dependence of controlled electric field [10, 11]; – employing controlled valves, installed in the connection line between two sites of the piston in the oil-filled damper [12, 13]
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