Politecnico di Torino - Corso Duca degli Abruzzi, 24 - 10129 Torino, ITALY

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Vehicle suspension with adjustment of vibration damping force

Controlled shock absorberControlled suspensionNon linear controlSemi-active controlTrim control


Device for connecting the elastic elements and variable type dissipators of a mechanical suspension interposed between two vibrating or oscillating mechanical systems, respectively the source body and the receiving body, in order to attenuate the forces acting on the receiving body, and / or its displacement , and / or its speed, or combinations of the previous physical quantities and / or any others, which are produced on the receiving body due to the motion or forces to which the source is subject.

Technical features

Device consisting of elastic means, such as metal components or compressed gases, energy dissipating elements, either by means of friction between a fluid and a solid, or between solid and solid, or by means of suitable electromagnetic couplings, whose damping capacity can be varied , automatically and by means of an appropriate control system, according to the operating conditions of the suspension. The control strategies are based on the calculation of variations, a special case of the Pontryagin technique that allows you to switch from an “open loop control program” to a “closed loop controller”. The developed method produces a general class of controls called VFC – Variational Feedback Control, which are generally applied to non-linear systems for vibration and noise control. The implementation of control logics and the use of controlled multi-damping systems involves the programming and implementation of control units and dedicated sensors. The invention has performances superior to those of the state of the art, with damping effects on the receiving structure. A first prototype of the invention was developed, mounted on the Sapienza HU245 prototype vehicle, which showed excellent results. Subsequently, the experimentation on the production car took place.

Possible Applications

  • Automobiles, motorcycle and high speed boats;
  • Aircraft trolleys;
  • Civil structures.


  • Semi-active multi dampers suitably connected, properly controlled, improving the dynamic response of a system;
  • Dampers controlled by ad hoc control logics;
  • Modulation of the damping and stiffness of the system and therefore the resonance peak itself.