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超磁致伸缩材料Terfenol-D在机械应力作用下,磁化强度会发生变化,这种效应为逆磁致伸缩效应或Villari效应,利用该效应可以制作将机械能转换成电能的振动传感器。进行振动传感器的实验研究,结果表明在合适的偏置磁场和较小的预应力偏置条件下,传感器输出的感应电压峰-峰值较大,传感器输出感应电压的峰-峰值和输入振动信号的频率和幅值成正比。基于电磁学原理和铁磁材料的磁化强度模型,计算振动传感器的偏置磁场和预应力对感应电压输出的影响,并计算振动传感器在机械振动输入条件下的感应电压输出,实验结果与计算结果基本相符。实验结果和计算结果为振动传感器的优化设计和应用打下基础。
Magneto-mechanical properties of Terfenol-D, a magnetostrictive material, vary depending on the magnetostrictive or Villari effect. This effect makes it possible to produce vibration transducers that convert mechanical energy into electrical energy. The experimental results of the vibration sensor show that the peak-to-peak value of the induced voltage output by the sensor is larger under the suitable bias magnetic field and the smaller prestressed bias. The peak-peak value of the induced voltage and the amplitude of the input vibration signal The frequency is proportional to the amplitude. Based on the principle of electromagnetism and the magnetization model of the ferromagnetic material, the influence of bias magnetic field and prestress on the induced voltage output of the vibration sensor is calculated, and the induced voltage output of the vibration sensor under the condition of mechanical vibration input is calculated. The experimental results and the calculated results Basic match. The experimental results and calculation results lay the foundation for the optimization design and application of vibration sensors.