Abstract
This paper proposes a hydraulic energy-harvesting shock absorber prototype, which realizes energy harvesting of the vibration energy dissipated by the automobile suspension system. The structural design of the proposed shock absorber ensures that the unidirectional flow of oil drives the hydraulic motor to generate electricity while obtaining an asymmetrical extension/compression damping force. A mathematical model of the energy-harvesting shock absorber is established, and the simulation results indicate that the damping force can be controlled by varying the load resistance of the feed module, thus adjusting the required damping force ratio of the compression and recovery strokes. By adjusting the external load, the target indicator performance of the shock absorber is achieved while obtaining the required energy recovery power. A series of experiments are conducted on the prototype to verify the validity of the damping characteristics and the energy recovery efficiency as well as to analyze the effect of external load and excitation speed on these characteristics.
Highlights
Recovery of energy dissipated during driving of automobiles has been extensively researched [1, 2]
Damping Controllable Feature Verification. is section discusses the results of the experimental study on the controllable range of the damping force under the same excitation amplitude (50 mm), different excitation speeds, and different external loads
A hydraulic shock absorber was proposed, and the design principle and mathematical model were described in detail. e principle prototype was built to verify the damping characteristics and energy recovery characteristics
Summary
Recovery of energy dissipated during driving of automobiles has been extensively researched [1, 2]. A hydraulic energyharvesting shock absorber can convert vibration energy dissipated by the suspension system into electric energy for recycling, thereby realizing energy conservation and ensuring a stable working performance of the shock absorber. Many types of energy-harvesting shock absorbers have been developed. Salman presented a regenerative absorber based on helical gears and dual tapered roller clutches for electric vehicles [3]. Zhang presented an energy-harvesting shock absorber that uses an arm-teeth mechanism to convert linear motion to rotational motion and to amplify the generator input speed [4]. Zuo et al designed and established a 1 : 2 prototype based on a linear motor-type feed-through suspension [5].
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