Research on Multi-modal Piezoelectric Energy Harvesting Technology of Rail Vibration Absorber
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摘要: 提出一种结合钢轨吸振器与多模态压电式俘能器的新型振动能量回收技术,在有效减轻轨道振动的条件下,回收钢轨吸振器的振动能量为各类轨道监测设备供能。通过建立车轮-轨道-吸振器系统的振动分析模型,研究了能量回收模块对吸振器减振性能的影响规律,并使用谐响应分析研究了能量回收模块的发电能力。分析结果显示,当多模态能量回收装置安装在钢轨吸振器上时,不会对钢轨吸振器的减振性能产生明显影响。并且,多模态结构能有效拓宽0~600 Hz频率范围内的振动能量回收频带,提高振动能量的回收效率。Abstract: In this paper, a multi-modal piezoelectric energy harvesting device which based on rail vibration absorber was established. This device not only can reduce the track vibration effectively, and also harvest the vibration energy of rail vibration absorber. The effect of piezoelectric energy harvesting module on vibration absorption efficiency of the vibration absorber has been studied base on an elastic vibration model of the wheel-rail-absorber system. And the power generation capacity of piezoelectric energy harvesting module has been analyzed with the harmonic response method. The simulation results show that the energy harvesting module has little influence on the absorption efficiency of vibration absorber when it has been installed. Moreover, the multi-modal structure can broaden the frequency band of vibration energy harvesting effectively in the frequency range of 0 ~ 600 Hz, and increase the harvesting efficiency of vibration energy.
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Key words:
- rail vibration absorber /
- vibration energy /
- multi-model /
- energy harvesting
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表 1 轮轨模型的连接参数
连接参数 X(轴向) Y(竖向) Z(纵向) 道床支撑刚度/(N·m−1) 5.0 × 107 5.0 × 107 8.9 × 107 道床支撑阻尼/(N·s·m−1) 4.0 × 104 4.0 × 104 8.9 × 104 钢轨扣件刚度/(N·m−1) 8.9 × 106 8.9 × 106 4.1 × 107 钢轨扣件阻尼/(N·s·m−1) 2.1 × 103 2.1 × 103 2.1 × 103 吸振器刚度/(N·m−1) 1.5 × 107 1.5 × 107 3.0 × 107 吸振器阻尼/(N·s·m−1) 2.0 × 104 2.0 × 104 2.0 × 104 表 2 轮轨模型的材料参数
部件 材料密度/(kg·m−3) 弹性模量/GPa 泊松比 枕木 2400 32.5 0.3 车轮和钢轨 7800 210 0.3 表 3 轨道振动能量采集模型的材料参数
名称 密度/
(kg·m−3)弹性模
量/GPa长×宽×高/
mm泊松比 吸振器 7850 210 425 × 45 × 90 0.29 悬臂梁 8600 134 20 × 5 × 0.8 0.30 压电片 7600 80 24 × 5 × 0.3 0.36 质量块 7400 160 20 × 5 × 20 0.24 注:悬臂梁为螺旋型悬臂梁的末端梁,梁臂间隙为2 mm -
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