Research On The Key Technologies Of The Vehicle Active TID Suspension

Suspension is the key component to ensure the ride comfort and driving safety of the vehicle.In recent years,new components such as inerter have been added to the suspension system,breaking some limitations of traditional suspension design and becoming one of the hot spots of suspension research.In order to solve the existing problems in the active suspension and the suspension with inerter,a new type suspension called active Tuned-Inerter-Damper(TID)suspension was presented in this thesis.Theoretical analysis and experimental research on suspension structre,control strategy,parameter optimization,suspension system weight reduction,influence of inerter’s nonlinearity on suspension performance were carried out.Some progress was made in the thesis as follows:The structure of the active TID suspension with the "grounchook-inerter" control strategy were presented.The active TID suspension with the "groundhook-inerter" control strategy can make the inherent inertia of the actuator participate in the suspension construction together with the inerter and overcome the bottleneck that the inertia of the actuator which is harmful to the active suspension performance.This method can also solve the problem that the passive TID suspension,which introducing the unprung vibration energy,can not achieve the performance of the tuned-mass-damper(TMD)suspension.Through the theoretical modeling and simulation of the active TID suspension,the influence of each element parameter on the performance of the suspension was evaluated.An optimization method was proposed by solving the H2 norm of transfer function of suspension performance index.The planetary fly wheel inerter,which is a new type of ball screw inerter was put forward.Through the compound motion of the planetary gears composed of revolution and rotation,the planetary flywheel inerter greatly improves the ratio of the rotational inertia to the flywheel gravitational mass(the inertia-to-mass ratio).When the inerter reaches the target inertia,the weight of the fly wheel is effectively reduced.By analyzing the mathematical relationship between structural parameters and inertia-to-mass ratio,the optimization design method to maximize the inertia-to-mass ratio was established.Theoretical and experimental result show that,as the core inertial component of an inerter,a planetary flywheel can completely replace a traditional flywheel,making the inerter lighter.According to the dynamic characteristics of the planetary flywheel and the ball screw,a nonlinear dynamic model of the planetary flywheel inerter was established.Then the model parameters were identified and verified by experiments.Based on the theoretical research of the active TID suspension and the planetary flywheel inerter,a nonlinear dynamic model of the active TID suspension was established.The influence and sensitivity of the nonlinear factors in the ball screw and the planetary flywheel on the performance of the suspension were analyzed.Finally,the principle prototype of the active TID suspensions was designed and produced.The 1/4 suspension test bed was built.The correctness and validity of the theory of active TID suspension and "groundhook-inerter" control strategy were verified by experiments,and the practicability of planetary flywheel inerter in active TID suspensions was also verified.