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Design of a nonclipped H∞ controller for high-speed train magnetorheological suspension system
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DOI：10.1088/1361-6501/ae5cbe.png)
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Abstract
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The prevalent controller design for high-speed train (HST) magnetorheological (MR) suspension systems relies on the clipped framework (CF), which potentially leads to high-frequency performance degradation, accelerated failure, exacerbated electromagnetic interference noises, and reduced hunting stability. To address these drawbacks, this paper proposes a novel nonclipped (NC) H-infinity controller. First, a seven-degree-of-freedom HST model with MR dampers is established. Next, a piecewise model is derived for approximating the nonlinear MR damper constraint via a reference force and a symmetric constraint. A NC framework (NCF) is subsequently proposed to eliminate truncation effects and ensure actuation smoothness. By integrating the piecewise model with the NCF, a piecewise controller is synthesized, wherein lateral ride comfort is ensured by H-infinity performance and a modified sector condition handles the nonaffine property introduced by the NCF. Ultimately, the controller design is formulated as a linear matrix inequality optimization problem, from which the control gains are derived. Comprehensive simulations demonstrate that the proposed controller substantially improves the actuation smoothness and hunting stability over CF-based controllers, without compromising ride comfort. The paper thus offers a more effective and reliable solution for HST-MR suspension systems.
Keywords:
H(infinity)control
semi-active control
high-speed train
magnetorheological suspension
nonlinear constraint
vehicle system dynamics and control
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