柱棒式超磁致伸缩能量收集器的设计与实验

Design and experiments of a column giant magnetostrictive energy harvester

为了能够利用自然界中的振动能量,弥补传统微器件供能方式的不足。设计制作了一种以超磁致伸缩材料(GMM)为基础的振动能量收集装置,并通过实验加以验证其能量收集特性;首先,通过对超磁致伸缩材料物理特性的分析,进行了能量收集装置理论建模与仿真分析;然后,根据仿真分析的结果设计了一套柱棒式的超磁致伸缩能量收集器;最后,通过搭建实验平台进行了效果验证。实验结果表明:当输入激振信号频率f_n不变,振动能量收集装置输出电压峰-峰值和输入振动信号的幅值F_m成正比;当输入振动信号幅值F_m不变,振动能量收集装置输出电压峰-峰值和输入激振信号的频率fn成正比;在激振应力最大值为2.54 MPa、频率100 Hz的正弦激振条件下,感应线圈100匝的实验条件下,超磁致伸缩振动能量收集器输出电动势峰-峰值为136.4 mV,与理论值(156 mV)符合较好,且波形一致。

In order to make use of the v ib rat io n energy from nature and power micro d e v ice s, a k in d of vibrat io n energy harvester based on giant magnetostrictive material （GMM ） was designed and ve r if ie d through an experiment. First, based on the analysis of the physical properties o f GMM , the modeling and simulat ion o f the energy harvest device has been analyzed. And then , according to the results o f simulation an aly s is, a set o f columnclaviform giant magnetostrictive energy harvester was designed. Final ly , an experimental plat form was established to ve r ify the effect o f the design. Experimental results indicate that when the frequency o f in p u t excitat ion signal /n is constant, the peak- to-peak value of the output voltage of the device is d ire c t ly proportional to the amplitude o f in p u t v ib rat io n signal F m . When the amplitude of input vibration signal Fm is constant, the peak- to-peak value o f the output voltage o f the device is d ire c t ly proportional to the frequency of the input excitat ion s ig n a l/n. When the maximum of the v ib rat io n stress is 2. 54 M P a, the sinusoidal vibration frequency is 100 Hz and the turns of in d u c tioncoilis 100, the peak- to-peak value of output electromotive force of the device is 136. 4 mV . This result is better in l in e w ith the theoretical value （156 mV ） and the waveform is consistent as well.