Dynamic Characteristics Analysis Of Energy-Harvesting Shock Absorber With Low Speed And Heavy Duty Capacity Based On Power Bond Graph

Traditional oil shock absorbers dissipate the driving energy of the vehicle to the air through friction or thermal energy,which may lead to problems such as oil leakage,increased carbon emissions,energy crisis and environmental pollution,and high-speed damping failure.Therefore,this paper designs a energy-harvesting shock absorber with low speed and heavy duty capacity based on a ball screw mechanism,which has the advantages of high energy-harvesting efficiency and large damping.The details are as follows:Firstly,the energy-harvesting shock absorber with low speed and heavy duty capacity is designed based on the ball screw mechanism,and the damping and energy-harvesting characteristics are systematically studied.Complete the parameter matching and 3D model establishment of each component of the energy-harvesting shock absorber,establish a virtual prototype simulation model of the energy-harvesting shock absorber based on a ball screw mechanism,and conduct dynamic simulations.Dynamic response,dynamic damping characteristics and energy recovery efficiency are obtained.The proposed energy-harvesting shock absorber can provide a damping force of 1200N at a speed of 0.4m/s.Secondly,the force-electric coupling dynamic analysis model of the energy-feeding shock absorber is established based on the power bond graph.The numerical simulation analysis is carried out,and the simulation results of the virtual prototype are compared to verify the correctness of the dynamic simulation model.The simulation results show that the energy-harvesting shock absorber can obtain a peak output power of 3 8W when only a small damping force of 340N is provided,and the energy-feeding efficiency is 28%,which provides a theoretical basis for the optimal design of the energy-harvesting shock absorber with low speed and heavy duty capacity.Drive train with higher transmission ratio as well as efficiency is the killer approach to extract the total vibration energy.Finally,based on the working mechanism of the energy-feeding shock absorber,its power flow model is established to calculate the transmission efficiency of the series system.The friction model of the ball screw mechanism and the large transmission ratio gearbox was established,and the influence of the structural parameters such as rotational speed and axial load on the transmission efficiency of the ball screw mechanism and the large transmission ratio gearbox was analyzed.The energy-harvesting shock absorber based on the ball screw mechanism has the highest transmission efficiency at heavy duty and low speed.The energy-harvesting shock absorber prototype is tested,and the parameters of recovered power,current and voltage verify the correctness of the simulation model.