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首页> 外文会议>Conference on Health Monitoring and Smart Nondestructive Evaluation of Structural and Biological Systems >Autonomous Health Monitoring of a Stiffened Composite Plate
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Autonomous Health Monitoring of a Stiffened Composite Plate

机译：加强复合板的自主健康监测

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The paper presents a unified computer assisted automatic damage identification technique based on a damage index, associated with changes in the vibrational and wave propagation characteristics in damaged structures. An improved ultrasonic and vibration test setup consisting of distributed, high fidelity, intelligent, surface mounted sensor arrays is used to examine the change in the dynamical properties of realistic composite structural components with the appearance of damage. The sensors are assumed to provide both the low frequency global response (i.e., modal frequencies, mode shapes) of the structure to external loads and the (local) high frequency signals due to wave propagation effects in either passive or active mode of the ultrasonic array. Using the initial measurements performed on an undamaged structure as baseline, the damage indices are evaluated from the comparison of the frequency response of the monitored structure with an unknown damage. The technique is applied to identify impact damage in a woven stiffened composite plate that presents practical difficulties in transmitting waves across it due to scattering and other energy dissipation effects present in the material and the geometry of the structure. Moreover, a sensitivity analysis has been carried out in order to estimate a threshold value of the index below which no reliable information about the state of health of the structure can be achieved. The feasibility of developing a practical Intelligent Structural Health Monitoring (ISHM) System, based on the concept of "a structure requesting service when needed," is discussed.
机译：本文提出了一种基于损伤指数的统一计算机辅助自动损伤识别技术，与损坏结构中的振动和波传播特性的变化相关联。一种改进的超声波和振动测试设置，包括分布式，高保真，智能，表面安装的传感器阵列，用于检查现实复合结构部件的动态特性随着损坏的外观。假设传感器由于超声波阵列的无源或有源模式中的波传播效应，将结构的低频全局响应（即，模频频率，模式，模式形状）提供给外部负载和（本地）高频信号。使用在未损坏的结构上执行的初始测量作为基线，从监测结构的频率响应的比较评估损坏指数，其具有未知损坏。应用该技术以识别编织加强复合板中的冲击损伤，其由于材料中存在的散射和其他能量耗散效应以及结构的几何形状而在其上透射波的实际困难。此外，已经进行了灵敏度分析，以便估计下面的指数的阈值，该阈值可以实现关于结构的健康状况的可靠信息。讨论了基于“在需要时请求服务的结构”概念的基础上开发实用智能结构健康监测（ISHM）系统的可行性。

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