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Frequency domain $ H_{\infty} $ control design for active suspension systems

  • * Corresponding author: Jamal Mrazgua

    * Corresponding author: Jamal Mrazgua 
Abstract / Introduction Full Text(HTML) Figure(6) / Table(2) Related Papers Cited by
  • A methodology for fault-tolerant-control(FTC) is proposed that compensates actuator failures in active suspension systems (ASS). This methodology is based on a Frequency Domain approach that represents failures using a scale factor to optimize the ASS and improve ride comfort. The controller design is carried out using off-the-shelf tools based on linear matrix inequalities (LMIs), guaranteeing asymptotic stability, compensating the effect of actuator faults, and ensuring certain $ H_{\infty} $ performance. In the context of ASS, the performance guarantees correspond to ride comfort in the presence of road disturbances. To validate the approach, controllers are developed and tested in simulation for a quarter-car model: the results illustrate the effectiveness of the proposed approach.

    Mathematics Subject Classification: Primary: 58F15, 58F17; Secondary: 53C35.


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  • Figure 1.  Quarter-car model with an active suspension

    Figure 2.  Bump response of sprung mass acceleration

    Figure 3.  Bump response of suspension deflection

    Figure 4.  Bump response of tyre deflection

    Figure 5.  Transfer function

    Figure 6.  Force of the actuator

    Table 1.  Quarter-Car Model Parameters

    $ m_{s} $ Suspended mass
    $ m_{u} $ Unsupported mass
    $ c_{s} $ Damping of the suspension system
    $ k_{s} $ Stiffness of the suspension system
    $ c_{t} $ Damping of the pneumatic tyre
    $ k_{t} $ Compressibility of the pneumatic tyre
    $z_{s} $ Displacement of the sprung mass
    $ z_{u} $ Displacement of unsprung mass
    $ \delta^ {f} (t) $ Fault-tolerant-control
     | Show Table
    DownLoad: CSV

    Table 2.  Quarter-Car Model Parameters

    $ m_{s} $ $ m_{u} $ $ k_{s} $ $ k_{t} $ $ c_{s} $ $ c_{t} $
    320 40 18 200 1 10
    kg kg KN/m KN/m KNs/m Ns/m
     | Show Table
    DownLoad: CSV
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