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首页> 外文会议>3rd International Workshop on Structural Health Monitoring, Sep 12-14, 2001, Stanford University >Wireless Strain Monitoring by Impedance Change of Composite Materials
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Wireless Strain Monitoring by Impedance Change of Composite Materials

机译：通过复合材料阻抗变化的无线应变监测

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摘要

Strain monitoring for composite materials in-service is quite effective to improve structural reliability of composite materials. Recently, it is demanded to monitor strain of tire structure in service. Since conventional strain gages have high stiffness and require lead wires, the conventional strain gages are cumbersome for the strain measurement of the tires. Since tires themselves are not expensive, expensive sensors such as MEMS are economically not affordable. That requires a new low cost wireless sensor for tires. In the present study, impedance change of composite materials due to the deformation by applied strain is measured, and the impedance change is utilized for the frequency generator of radio wave. By measuring the radio wave change, the strain of the composites can be measured wirelessly. Since the method demands simple oscillator circuits, the total cost of the sensor is very inexpensive, and the circuits themselves can be made compactly. In the present study, the specification of the method is discussed in detail, and the basic trial experiments of the method are conduced using tire specimens cut from a tire. Steel wires of tire are selected as electrodes and impedance changes due to the applied strain are directly measured. As a result, it is found that the electrodes are stable enough for using to an oscillator. Using a frequency generator circuit and a tuned circuit, the impedance change is wirelessly measured. Finally, the strain change is wirelessly monitored.
机译：在役复合材料的应变监测对于提高复合材料的结构可靠性非常有效。近来，需要监视使用中的轮胎结构的应变。由于常规的应变仪具有高的刚度并且需要引线，因此常规的应变仪对于轮胎的应变测量而言是麻烦的。由于轮胎本身并不昂贵，因此诸如MEMS之类的昂贵传感器在经济上是负担不起的。这就需要一种新型的低成本轮胎无线传感器。在本研究中，测量了由于施加的应变而引起的复合材料的阻抗变化，并将该阻抗变化用于无线电波的频率发生器。通过测量无线电波的变化，可以无线测量复合材料的应变。由于该方法需要简单的振荡器电路，因此传感器的总成本非常便宜，并且电路本身可以紧凑地制造。在本研究中，将详细讨论该方法的规范，并使用从轮胎上切下的轮胎样本进行该方法的基本试验。选择轮胎钢丝作为电极，并直接测量由于施加的应变引起的阻抗变化。结果，发现电极足够稳定以用于振荡器。使用频率发生器电路和调谐电路，可以无线方式测量阻抗变化。最终，无线监测应变变化。

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