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首页> 外文会议>Symposium on Nondestructive Characterization of Materials in Aging Systems, held November 30- December 4, 1997, Boston, Massachusetts, U.S.A. >A digital mems-based strain gage for structural health monitoring
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A digital mems-based strain gage for structural health monitoring

机译：基于数字记忆的应变计，用于结构健康监测

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摘要

One approach for structural health monitoring of aging aircraft is to take discrete airframe strain measurements and record the flight loads history. A complementary methhod consists of measuring changes in dynamic response due to fatigue crack growth. The challenge in implementing such methods is the need for inexpensive networks of distributed strain sensors which possess high resolution with no drift over time. The Uni-Axial Strain Transducer (UAST) has been developed as a digital, absolute encoding device to address these very issues. The UAST is a micro-electro-mechanical system (MEMS) which exploits the capacitive coupling between an array of electrostatic field emitters and an array of 64 field detectors on a CMOS IC chip. The slightly different array element sapcings form a vernier scale and digital signal processing of the detector outputs is used to calculate the absolute translational displacement of the emitter array relative to the CMOS detector chip. The UAST provides a dynamic range of 11,500 mu -strain and displacements of 2.5 nm are easily resolved. The sensor sampling rate is dynamically configurable for 150, 290, 540, 1000, 1600 or 2500 Hz, providing 15, 14, 13, 12, 11, or 10 bits of resolution (equal to 0.35, 0.7, 1.4, 2.8, 5.6, or 11.4 mu -strain), respectively. The sensor network can communicate with up to 128 UASTs on a common 5-wire digital bus, eliminating the need for shielding and considerably reducing the number of wires which will have to be routed through the airframe. A network technology demonstration is being conducted on a 1/2 scale F-18 vertical tail where dynamic loads are appleid to evaluate network performance related to monitoring of fatigue crack growth or rivet-line filures. Application of the UAST in a helicopter rotor health usage crack growth or rivet-line failures. Application of the UAST in a helicopter rotor health usage and monitoring system, and the design of a bi-axial transducer under development, are also mentioned.
机译：老化飞机的结构健康监测的一种方法是进行离散的机身应变测量并记录飞行载荷历史。补充方法包括测量由于疲劳裂纹扩展而引起的动态响应变化。实施这种方法的挑战是需要廉价的分布式应变传感器网络，该网络应具有高分辨率且不会随时间漂移。单轴应变传感器（UAST）已开发为一种数字绝对编码设备，可以解决这些问题。 UAST是一种微机电系统（MEMS），它利用CMOS IC芯片上的静电场发射器阵列和64个场检测器阵列之间的电容耦合。略有不同的阵列元件间距形成游标刻度，并且检测器输出的数字信号处理用于计算发射器阵列相对于CMOS检测器芯片的绝对平移位移。 UAST提供了11,500 mu应变的动态范围，并且解决了2.5 nm的位移。传感器采样率可动态配置为150、290、540、1000、1600或2500 Hz，提供15、14、13、12、11或10位分辨率（等于0.35、0.7、1.4、2.8、5.6，或11.4 mu -strain）。传感器网络可通过一条普通的5线数字总线与多达128个UAST通信，从而无需屏蔽，并大大减少了必须通过机身进行布线的电线数量。在1/2比例的F-18垂直尾翼上进行网络技术演示，其中动态载荷是小程序，以评估与监视疲劳裂纹增长或铆钉线污迹有关的网络性能。 UAST在直升机旋翼健康使用中的应用裂纹扩展或铆钉线故障。还提到了UAST在直升机旋翼健康使用和监视系统中的应用，以及正在开发的双轴传感器的设计。

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