直升机桨叶阵列式压电模态传感器的故障诊断

Fault Diagnosis for Piezoelectric Modal Sensor Array of Helicopter Blade

提出了一种基于加权系数的直升机桨叶阵列式压电模态传感器的故障诊断方法。以直升机桨叶为例,以圆形锆钛酸铅压电陶瓷(PZT)作为压电传感单元。将实验曲率模态作为加权系数设计阵列式压电模态传感器,对PZT在使用过程中易出现的破损和脱层故障进行了实验研究。实验结果表明,基于加权系数的阵列式压电模态传感器的故障诊断方法能对压电阵列中的损伤单元进行准确定位,且其诊断结果具有很高的置信度;所提出的损伤因子可在一定损伤范围内作为损伤程度的指示参数。

A fault diagnosis method for piezoelectric modal sensor array bonded on helicopter blade based on weighted coefficient is presented.The circular lead zirconate titanate piezoelectric ceramic(PZT)is used as piezoelectric element.The experimental curvature modes are used as the weighted coefficient to design the piezoelectric modal sensor array,and the breakage and delamination faults of PZTs are experimentally detected and investigated.Experimental results show that the proposed fault diagnosis method for piezoelectric modal sensor can accurately locate the fault PZT element in the piezoelectric array.Furthermore,the diagnosis results have high confidence.The proposed damage factor can be used as an indicator parameter of fault degree within a certain damage range.