Flange bolt looseness detection based on flexible piezoelectric material sensor
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摘要: 采用柔性压电复合材料传感器进行法兰螺栓松动检测,研究PZT粒径对复合材料压电和介电性能的影响。制备的复合材料压电电压常数g33达到117 mV·N-1。采用柔性复合材料传感器接收单个和多个螺栓在不同松动程度下的超声波,获得超声波透射信号首达波幅值随螺栓松动变化规律。结果表明,随着单个法兰螺栓松动程度加剧,超声波透射信号首达波幅值减小;法兰螺栓在相同预紧力矩情况下,超声波透射信号首达波幅值随着螺栓松动个数增加而减小。研究可为法兰螺栓松动定量检测提供理论依据。Abstract: Flange bolt loosening can be detected by using the flexible piezoelectric composite sensor. The effect of PZT particle size on the piezoelectric and dielectric properties of the composites was experimentally studied. The piezoelectric voltage constant g33 of the prepared composites reached 117 mV·N-1. The flexible composite material sensor was used to receive ultrasonic waves with different loosening degrees of single and multiple bolts, and the variation law of the first arrival wave amplitude of the ultrasonic transmission signal with the loosening of the bolts was obtained. The experimental results have shown that as the loosening degree of a single flange bolt increases, the amplitude of the first arrival wave of the ultrasonic transmission signal decreases. Under the same pre-tightening torque of flange bolts, the first arrival wave amplitude of ultrasonic transmission signal decreases with the increase of the number of loose bolts, which shall provide a theoretical basis for quantitative detection of flange bolt looseness.
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