Dynamic Simulation And Performance Study Of Hydraulic Electromagnetic Regenerative Shock Absorber

Suspension system, as one of the vehicle important component, is used to transfer forcesand torques between the vehicle body and wheels, reduce the impact caused by the irregularroad surfaces excitation and decay the vibration. It can ensure the vehicle ride comfort anddriving stability, and ensure the vehicle running at a high speed. Shock absorbers of thesuspension system have an important influence on the vehicle performances including thevehicle ride comfort and driving stability. However, trade-offs exist in the different vehicleperformances when we design the damping characteristic. In this case, some performancesmust be sacrificed in order to ensure the more important ones. Traditional shock absorbertransfers the vibration energy into heat, and then dissipates it into surroundings. In order torecycle this wasted vibration energy, the regenerative shock absorber concept was proposed,which aims at guarantee the vehicle ride comfort, meanwhile harvest the vibration energy asefficient as possible.A novel hydraulic electromagnetic regenerative shock absorber is proposed. The designof the hydraulic actuator ensures the oil passing through the hydraulic cylinder in one-wayregardless under the extension or compression stroke, and the oil flow drives a hydraulicmotor to rotate in one direction, and then drives a generator to generate electricity efficiently.The electricity is stored in a battery. In this paper, the dynamic simulation and performanceof the hydraulic electromagnetic regenerative shock absorber are studied in detail, and themain work is divided into four aspects:Firstly, structural selection and overall program design of the regenerative shock absorber.A novel hydraulic electromagnetic regenerative shock absorber is proposed based onanalyzing the structure and principle of existing energy regenerative shock absorbers andcomparing the characteristic of each structure. Its overall structure and working principle areintroduced in detail.Secondly, dynamic modeling and simulation analysis of the regenerative shock absorber.The dynamic model of the regenerative shock absorber is derived, and then the influences ofexcitations, loads, and shock absorber parameters on regenerative and dampingcharacteristics are obtained via dynamic simulation. Next, the four-wheel random road and vehicle dynamics model are established. Combined with a SUV model, simulations arecarried out to acquire the influence and regenerative characteristic of the regenerative shockabsorber. What’s more, the relationships between fuel efficiency and this shock absorber, thepotential applicable vehicle types of this shock absorber, are analyzed.Thirdly, prototype design and analysis of the hydraulic electromagnetic regenerativeshock absorber. The structure parameters of the regenerative shock absorber are optimizedfor the further design and manufacture of the prototype. And then the main parts of theregenerative shock absorber are selected, and the detail of particular parts are designed andmanufactured. After these works, the prototype is precisely assembled.Fourthly, test bench building and experimental study on the performance of theregenerative shock absorber. In order to get the performance analysis of the regenerativeshock absorber, we carry experiments through special test equipment designed andfabricated in our laboratory and the dynamometer machine. At last, we get the dynamometercharacteristic and regenerative characteristic under different conditions, and analyze thedifferences between the experiment results and simulation results.Finally, summary and outlook. Conclusions are summarized and future researchdirections are given.