Vibration Control Technology Of Active Vehicle Suspensions

With the development of automotive technology, active vehicle suspensions system is increasingly becoming research focus. The current study about vibration control technology of active vehicle suspensions still remained at the theoretical stage. There are several issues needed to be resolved. First and foremost, a good system model must be needed for the vehicles are complex mobile devices. Second, safe and effective controller should be designed to get good effect, because the system what we faced is very special. Last but not least, we need experiment to check our controller. Because a real experimental system is very expensive, the virtual prototyping technology should be used which can get virtual prototyping model. Then we can make the virtual experiment as true as possible.By studying the literature of domestic and foreign, this paper got its own results. In the first place, Reasonable vehicle suspension model is proposed, which can reflect the system's vibration characteristics including suspension parameters easy to change and actuator time delay characteristics. Next, A new method for developing generalized H₂/H_∞control problem with input time delay and parameter uncertainty was proposed, which was used in active vehicle suspensions design. The time delay of actuator was assumed as uncertain time-invariant but had a known constant bounded, and the uncertain parameter of system was norm-bounded. Aimed for the design requirements of suspensions, the H_∞and generalized H₂ performance index were used to reflect the mechanical structure design constraints and the sprung mass acceleration respectively. By defining a Lyapunov function, the two performance indices of closed-loop system were met simultaneously. Then the problem of designing a mixed generalized H₂/H_∞controller was transformed into the calculation of linear matrix inequalities. Last, the virtual prototyping simulation software ADAMS(Automatic Dynamic Analysis of Mechanical Systems) and MATLAB were used and a virtual prototype experiment platform have been build for experiments.