Exploring Dynamic Characteristics of Bi-stable Speed Bump Energy Harvester
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摘要: 提出了一种新型的双稳态减速带能量捕获装置，建立了其力学模型及动力学方程。在（前）后轮和前、后轮分别冲击减速带的情况下，分别选取常用的4种减速带进行对比，研究不同减速带参数下，双稳态振动发电系统的动力学响应特性，得出在第Ⅱ类减速带参数下，系统跨过势垒的次数最多，做大幅运动的时间较长，平均输出功率最大；在选取最佳减速带形状的情况下分别对不同车重下系统的发电量进行研究，得出车辆越重，发电量越大的规律。通过对外部负载电阻的研究，获得了最优电阻。上述研究结果可为减速带能量捕获系统的相关研究提供理论参考。Abstract: The paper puts forward a new speed bump energy harvester based on bi-stable vibration (SBEHBV). Its mechanical model and dynamic equations are established. The four kinds of a commonly used speed bump are selected through simulation. The dynamic response and output power of the SBEHBV system excited by one wheel impact pattern, i.e., the front (or rear) wheel or by two wheel impact pattern, i.e., the front wheel followed by rear wheel, are studied with the parameters of different speed bumps respectively. The simulation results show that the numbers of crossing potential barriers of the SBEHBV system with the parameters of the class Ⅱ speed bump are much more than those of the system with other class speed bumps. The time of large-amplitude motion occurrence and the average output power are more than those of others. Therefore, the output power of the SBEHBV system with the class Ⅱ speed bump under the excitation of a different vehicle weight is studied further. The simulation results also show that the weight of the vehicle is heavier and that its output power is greater. Furthermore, the optimum resistance is obtained by studying the effect of different external load resistance on the output power.
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Key words:
- bi-stability /
- speed bump /
- energy harvester /
- output power /
- large amplitude motion
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表 1 4种车型参数
参数 车型A 车型B 车型C 车型D mu/kg 50 70 110 180 ms/kg 900 1 350 2 000 5 000 ku/(N·m) 180 000 250 000 400 000 800 000 ks/(N·m) 35 000 45 000 60 000 290 000 cu/ (N·s·m-1) 3 000 3 500 5 800 15 000 cs/ (N·s·m-1) 1 500 1 800 3 000 9 970 L1/m 0.77 1.21 1.31 1.26 L2/m 1.15 1.31 1.60 2.34 
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