The problem considered in this paper is the design and analysis of control strategies for semiactive suspensions in road vehicles. The most commonly used control framework is the well-known Sky–Hook (SH) damping. Two-state or linear approximation of the SH concept are typically implemented. The goal of this paper is to analyze the optimality of SH-based control algorithms, and to propose an innovative control strategy, named Acceleration-Driven-Damper (ADD) control. It is shown that ADD is optimal in the sense that it minimizes the vertical body acceleration (comfort objective) when no road-preview is available. This control strategy is extremely simple; it requires the same sensors of the SH algorithms, and a simple two-state controllable damper. In order to assess and to compare the closed-loop performance of the SH and ADD control strategies, both a theoretical and a numerical analysis of performance are proposed.
The problem considered in this paper is the design and analysis of a control system for semi-active suspensions in road vehicles. Three control strategies are tested the twostate skyhook damping, the linear skyhook damping, and a newly-proposed control strategy based on two-state switching dampers. In order to assess and to compare the closed-loop performance of these control strategies, an evaluation method based on the describing-fnnction is proposed. This evaluation approach provides, in the frequency-domain, a clear picture of the closed-loop performance on the body acceleration (comfort objective) and on the vertical load at the road-tire contact surface (handling objective). This evaluation method inherently provides a quantitative estimate of the degree of Inputloutput non-linearity of the closed-loop system.
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