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针对斜拉桥工程结构高精度、高灵敏、高稳定性的检测要求,设计制备了一种多层磁电复合材料的新型索力传感器。在磁致伸缩材料尺寸最优条件下,运用环氧树脂、银导电胶粘结技术和涂胶厚度控制技术,使Terfenol-D合金与PMN-PT压电晶体、两个电极片与压电晶体均匀粘结固化,制备成层状磁电复合材料。采用漏磁场小、抗干扰好的磁回路结构设计,通过有限元方法获得复合材料驱动磁场和偏置磁场的工作范围。并在拉力试验机上进行了传感器动态性能试验。研究表明,新型索力传感器精度提高1%,响应时间最大减少50%,适合于复杂多变环境下斜拉桥索力的精确可靠检测。
Aiming at the requirements of high-precision, high-sensitivity and high-stability test of cable-stayed bridge engineering structure, a novel cable force sensor with multi-layer magnetic composite materials was designed and prepared. In the optimal conditions of magnetostrictive material size, using epoxy resin, silver conductive adhesive bonding technology and glue thickness control technology, Terfenol-D alloy and PMN-PT piezoelectric crystal, two electrodes and piezoelectric crystal Uniform bonding and curing, prepared into a layered magnetic composite. The structure of the magnetic circuit with small leakage magnetic field and good anti-interference is adopted, and the working range of the driving magnetic field and the bias magnetic field of the composite material is obtained by the finite element method. And in the tensile testing machine on the sensor dynamic performance test. The research shows that the accuracy of the new cable force sensor is increased by 1% and the response time is reduced by 50% at maximum, which is suitable for the accurate and reliable detection of the cable force of the cable-stayed bridge in the complex and variable environment.