Vibration-Based Structural Damage Detection: Theory and Applications

基于振动的结构损伤检测：理论与应用

• 批准号: 0600559
• 负责人: Weidong Zhu
• 金额: $ 20.04万
• 依托单位: University of Maryland Baltimore County
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-09-01 至 2011-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0600559&HistoricalAwards=false
• 关键词: Vibration; Based; Structural; Damage; Detection

Abstract Damage in a structure can be defined as a reduction in the structure's load bearing capacity, which can result from deterioration of the structure's components and connections during its service life. The objectives of the proposed research are to develop and experimentally validate: 1) a robust, iterative algorithm that can accurately detect the locations and extent of small to large levels of damage using a minimum number of vibration measurements; and 2) novel stochastic models for the random impact test in modal testing and a novel random impact device. The new iterative method that combines a general-order, multiple-parameter perturbation method and an optimization method can accurately detect the locations and extent of damage in beam structures such as lighting masts using only the first few measured natural frequencies. Other new features include treatment of ill-conditioned system equations, enrichment of the measurement information by modifying the structure in a controlled manner, development of physically-based joint modeling techniques, and joint damage detection. The random impact test can combine the advantages of the single-impact test and the shaker test; it can increase the energy input to the structure, and improve the signal-to-noise ratio and the measured frequency response function. With the stochastic models for the random impact series the input energy to the structure can be distributed in a wide or desired frequency range. The random impact device will be lighter, simpler, and easier to use than a shaker; it can also be designed to excite very large structures. Collaboration

摘要结构的损伤是指结构承载能力的降低，这可能是由于结构构件和连接件在使用寿命期间的劣化造成的。所提出的研究的目标是开发和实验验证：1）一个强大的，迭代算法，可以准确地检测位置和程度的小到大的损伤使用最少数量的振动测量;和2）新的随机模型的随机冲击试验在模态测试和一种新的随机冲击装置。新的迭代方法，结合了一般的顺序，多参数摄动法和优化方法，可以准确地检测梁结构，如照明桅杆使用前几个测量的固有频率的损伤的位置和程度。其他新功能包括病态系统方程的治疗，丰富的测量信息，通过修改结构的控制方式，基于物理的联合建模技术的发展，和联合损伤检测。随机冲击试验可以联合收割机结合单次冲击试验和振动台试验的优点，增加对结构的能量输入，提高信噪比和实测频响函数。利用随机冲击序列的随机模型，结构的输入能量可以分布在宽的或期望的频率范围内。随机冲击装置比振动器更轻、更简单、更容易使用;它还可以设计用于激励非常大的结构。协作