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首页> 外文期刊>Journal of intelligent material systems and structures >Structural health monitoring of rotary aerospace structures based on electromechanical impedance of integrated piezoelectric transducers
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Structural health monitoring of rotary aerospace structures based on electromechanical impedance of integrated piezoelectric transducers

机译：基于集成压电换能器机电阻抗的旋转航空结构结构健康监测

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摘要

Structural health monitoring of rotary aerospace structures is investigated in this research. A monitoring system is proposed based on the electromechanical impedance spectrum of piezoelectric transducers and a portable transceiver. To investigate the applicability and preliminary results of this method, a turbomachine prototype (laboratory device) is developed, and integrated composite piezoelectric films are deposited on the blades. Next, a self-diagnostic characterization is initially implemented to the piezo-films. Transceiver functionality and accuracy is verified using an Ivium impedance analyzer. The verified measuring path was used in structural health monitoring of pristine and damaged blades at rotational speed of 0 and 1000r/min. The effects of damage formation and rotational speed on the impedance signature are discussed based on the variations in mechanical impedance using a two-dimensional model. Once damage occurs in a blade at each speed, it results in a frequency shift of the impedance signature at antiresonance peaks compared to the corresponding baseline. The results show a clear frequency shift of existing peaks and the appearance of new peaks as damage grows to a secure minimal detectable size. This achievement confirms the applicability of this method for incipient damage detection on rotary structures prior to any failure.
机译：在这项研究中，研究了旋转航空结构的结构健康监测。提出了一种基于压电换能器和便携式收发器的机电阻抗谱的监测系统。为了研究该方法的适用性和初步结果，开发了涡轮机原型（实验室设备），并将集成的复合压电膜沉积在叶片上。接下来，首先对压电薄膜进行自我诊断。使用Ivium阻抗分析仪验证收发器的功能和准确性。经验证的测量路径用于原始和损坏叶片的结构健康监测，转速为0和1000r / min。使用二维模型，基于机械阻抗的变化，讨论了损伤形成和旋转速度对阻抗特征的影响。一旦叶片在每种速度下都发生损坏，与相应的基线相比，它将在反共振峰处导致阻抗信号的频率偏移。结果表明，随着损伤的增加，最小的可检测尺寸将对现有峰进行清晰的频移，并出现新峰。这一成就证实了该方法在任何故障发生之前对旋转结构的早期损坏检测的适用性。

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