| Shock absorber is an important component of the automobile suspension, and its role is the rapid decay the vibration of the vehicle. Damping of ordinary shock absorber is achieved by converted the vibration energy to heat. The research object of this paper is hydraulic electromagnetic energy-regenerative shock absorber, and it achieves the rapid vibration damping by recovery the vibration energy through a set of electro-hydraulic coupling system. Exploration and research are carried out on the potential of energy regenerative shock absorber, optimal energy recovery, internal and external characteristics of hydraulic electromagnetic energy-regenerative shock absorber and so on.First of all, the potential of energy regenerative shock absorber is carried out from the definition of road spectrum. From the suspension transfer equations, the energy-dissipated power is deduced from specific vehicle parameters theoretically. Suspension energy-dissipated factor is proposed which related to the suspension parameters only, and get the conclusion that, the suspension energy-dissipated power is proportional to the wheel stiffness, while almost has nothing to do with the unsprung mass, sprung mass, damping coefficient and suspension stiffness. And the equation of shock absorber energy-dissipated power is summarized under certain conditions.From the two-degree-of-freedom vibration model, get the maximum energy recovery under different excitation frequency. Solve the optimal load resistance based on the maximum energy recovery under different excitation frequency. And by the relationship of the load resistance and suspension damping ratio, deduce the equation of damping ratio and recyclable energy. Then get the maximum energy recovery under constrained optimal damping ratio under different excitation frequency.The characteristics and shortcomings of the first-generation prototype of the hydraulic electromagnetic energy-regenerative shock absorber are summarized. Then the second-generation prototype are designed and simulated, and the prototype and corresponding bench are trial-production. Studies are carried out on the damping characteristics and energy-regenerative characteristics of hydraulic electromagnetic energy-regenerative shock absorber. Firstly, theoretical analysis is carried out on the damping force of hydraulic electromagnetic energy-regenerative shock absorber, and the impact factors of the damping force are clear; then, the conclusion is verified by the test, and the damping characteristics of the prototype is clear. Meanwhile, the energy-regenerative characteristics are tested, and the test results demonstrate the feasibility of energy recovery. Finally, the impact of high-frequency excitation on the energy-regenerative characteristics is analyzed.Analysis is carried out on hydraulic system and the circuit of hydraulic electromagnetic energy-regenerative shock absorber. The internal characteristics of hydraulic electromagnetic energy-regenerative shock absorber are explored and summarized by theoretical and tested in this paper. The system model of the damping is established and deduced, and get that the hydraulic electromagnetic energy-regenerative shock absorber has the characteristics of variable volume, internal leakage, cavitation, oil pressure stable as well as active-controlled. The theoretical analysis and experimental results are both verified the hydraulic electromagnetic energy-regenerative shock absorber can isolate vibration while recover energy. |
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