Parameter Optimisation of Power Regeneration on the Hydraulic Electric Regenerative Shock Absorber System

Abstract

With the increasingly prominent energy issues, regenerative shock absorber has attracted intensive attention in last two decades for the development of structure design. However, the researchers sometimes concentrate on conceptual designs without considering optimal parameter refinements. This paper proposes a regenerative shock absorber called the “hydraulic electric regenerative shock absorber (HERSA)” which includes an analytical regeneration performance parameters optimisation approach to promote the regeneration efficiency and regenerated power. The developed HERSA model is able to convert oscillatory motion into unidirectional rotary motion through the alteration of hydraulic flow while recovering power by a generator. The proposed model is also capable of obtaining the optimal parameters at certain condition, as well as providing the flexibility of different component combinations to match specific system need. The results demonstrate that the proposed model can effectively decide the optimal parameters in the system, and also the recoverable power can achieve average power of 331 W at 1 Hz-25 mm sinusoidal excitation in the system, which is approximately 65% efficiency. This study can be further used to guide prototype design in future study.

Modelling, validation and parameter sensitivity of regenerative hydraulic-electric shock absorber

“…The asymmetry of the damping force is reduced by a smaller cylinder, and the power efficiency is increased by a larger one (57.84%).The degree of the damping-force asymmetry is reduced by a greater displacement. A high motor displacement (14 cc) reduces the motor damping force (7.3 kN) and regenerated power (198 W), and this comes at the expense of the power efficiency (only 45.15%).A large pre-charged pressure (50 bar) greatly reduces the damping force (8.2 kN) and power (184 W), but a low pre-charged pressure leads to better asymmetric damping.A small displacement of hydraulic motor is beneficial for the power-regeneration efficiency with more recoverable power and larger damping force.Similar to the effect of changing accumulator capacity (Zheng et al , 2019b), the changing of pre-charged gas pressure in accumulator has no significant influence on both recoverable power and power-regeneration efficiency. In addition, high pre-charged pressure is helpful for the stabilisation of the fluid flow through hydraulic motor and the shaft speed of the generator.…”

“…In Zheng et al (2019a, b), the orthogonal method is used to obtain a better parameters combination to improve the optimisation goal, which are the regeneration power and regeneration efficiency, respectively. Amongst them, the regeneration power is Pout in Equ.…”

“…When determining the key sub-component of RHSA system, the preliminary sizes of component were selected according to the actual installation space of vehicle suspension. In previous study (Zheng et al , 2019a, b), a 4 × 4 SUV (sport utility vehicle) was taken as the example and the maximum stroke of cylinder is determined as 200 mm. As for other vehicles, the sizes of their suspension system are also the important basis for the selection of hydraulic cylinder.…”

“…Given the results, a potential power content of 71–434 W and 287–1733 are available for ISO road grades of C and D, respectively, for a fully-loaded truck. In previous research (Zheng et al , 2019a, b), it was found that the recoverable vibration energy is influenced by the roughness of road surface, the travelling speed and the mass of vehicle. The recovery dissipated energy increases with the increasing of the vehicle mass.…”

Evaluation of power regeneration in primary suspension for a railway vehicle

“…In a typical passenger rail vehicle, much of motive energy is wasted by the E-mail: tpl_zw@163.com resistance from track irregularity, friction of moving parts and thermal losses. The kinetic energy loss of the primary and secondary dampers is one of the notable causes of energy losses in rail vehicle, with a total dissipated power between 3.5 and 3.8kW per vehicle [6,7].…”