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Sliding mode approach in semi-active suspension control

Sliding mode approach in semi-active suspension control

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Ride of the vehicle envelops the heave, pitch and rolling motion in forced vibration caused by road unevenness and roughness. Ride comfort is mainly concerned with the ability of chassis to cope with the various forms of the vertical dynamic excitation, which are unpleasant to the driver and passengers. Such excitations can be suppressed by the proper adjustment of passive suspension or control of semi-active and active suspension systems. This chapter introduces recent developments in the area of suspension control methods, overviews basics of vehicle vertical dynamics modelling, provides survey on existing control methods and proposes new hierarchical control architecture to reduce vertical, pitch and roll accelerations during driving over uneven road. This control strategy is based on application of integral sliding mode approach and optimal distribution of virtual demand between four semi-active shock absorbers. Obtained simulation results confirm positive effects in ride comfort compared to the vehicle with passive suspension and continuous Skyhook control.

Chapter Contents:

  • 6.1 Introduction
  • 6.2 Semi-active suspension system
  • 6.3 Active suspension system
  • 6.4 Methods on suspension control
  • 6.4.1 Vehicle modelling
  • 6.4.2 Single degree of freedom model
  • 6.4.3 Quarter car model
  • 6.4.4 Half car model
  • 6.4.5 Control methods overview
  • 6.5 Semi-active suspension control using sliding mode approach
  • 6.5.1 Problem statement
  • 6.5.2 Vehicle dynamics model
  • 6.5.3 Actuator model
  • 6.5.4 Overall control specifications
  • 6.5.5 High-level controller
  • 6.5.6 Allocation of the control demand
  • 6.5.7 Low-level controller
  • 6.5.8 Results and discussions
  • 6.6 Conclusions
  • Acknowledgements
  • References

Inspec keywords: variable structure systems; shock absorbers; vibration control; suspensions (mechanical components); motion control

Other keywords: optimal distribution; sliding mode approach; integral sliding mode approach; semiactive suspension control; virtual demand; continuous Skyhook control; active suspension systems; pitch accelerations; passive suspension; vertical dynamic excitation; road unevenness; roll accelerations; road roughness; semi-active shock absorbers; rolling motion; vehicle vertical dynamics; pitch motion

Subjects: Vibrations and shock waves (mechanical engineering); Mechanical variables control; Spatial variables control; Multivariable control systems

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