Abstract
In this paper, a new type of piezoelectric harvester for vehicle suspension systems is designed and presented that addresses the current problems of low energy density, vibration energy dissipation, and reduced energy harvesting efficiency in current technologies. A new dual-mass, two degrees of freedom (2-DOF), suspension dynamic model for the harvester was developed for the inertial mass and the force of the energy conversion component by combining with the piezoelectric power generation model, the rotor dynamics model, and the traditional 2-DOF suspension model. The influence of factors such as vehicle speed, the parameters of the harvester, and road classification on the root mean square (RMS) of the generated electric power is discussed. The results show that the RMS increases with the increase of the speed of the vehicle, the thickness and length of piezoelectric patches and magnetic slabs, and the residual flux density of magnets and road roughness coefficient and with the decrease of the width of piezoelectric patches and magnetic slabs and the space between the stator ring and the rotator ring. In the present research, a power of up to 332.4 W was harvested. The proposed model provides a powerful reference for future studies of energy harvesting from vehicle suspension systems.
Highlights
Ongoing energy crises such as oil shortages and problems such as environmental pollution have become great challenges to the automotive industry
A schematic diagram of the piezoelectric energy harvester and its geometry are shown in Figure 1. e upper end of the harvester is connected to the vehicle body, and the lower end is connected to the wheels. e harvester is connected in parallel with the shock absorber of the original vehicle. e schematic diagram illustrates that the motion conversion component is composed of a ball screw shaft and nut, and the energy conversion component is composed of an outer stator ring and an inner rotator ring
A new piezoelectric harvester device with high efficiency was designed for harvesting vibration energy from the suspension system during vehicle travel
Summary
Ongoing energy crises such as oil shortages and problems such as environmental pollution have become great challenges to the automotive industry. Interest in recovering energy lost due to vibration during vehicle travel is growing rapidly. Energy harvesting technology has significant potential for the current automotive industry by improving vehicle energy efficiency and fuel economy. E suspension system energy harvester is the complement for the onboard alternator, and the harvested vibration energy can charge the vehicle battery and provide power for the relevant load [10, 11]. When a typical passenger car is driven at a speed of 97 km/h on a good road surface, the potential for harvested power can reach between 100 and 400 W, which is equivalent to a 3% increase in fuel efficiency [12, 13]. When an off-road vehicle travels on a road of class D at a speed of 80 km/h, the generated electric power can reach as high as 2048 W [6]
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