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为了对含多处损伤的悬臂梁结构进行损伤检测定位,基于模态应变能法,采用大型有限元软件ABAQUS进行模态分析,使用其他设备进行模态实验测试,获得了悬臂梁结构在损伤前后的低阶模态应变能,并以应变能差值作为损伤指标对其进行损伤识别。仿真和实验结果表明,利用模态应变能可有效地对含多处损伤的悬臂梁结构进行损伤定位。在方法有效性验证的基础上,进一步综合分析了实验检测中测点布置、传感器数量、传感器位置以及模态阶数等因素对梁结构损伤检测定位的影响,研究表明:利用前3阶模态即可对含多处损伤的梁结构进行损伤定位,且测点布置间距与梁宽度相当时定位效果较理想;此外,传感器数量对损伤检测定位影响不明显。
In order to detect and locate the damage of the cantilever structure with multiple damages, modal analysis was carried out by using the large-scale finite element software ABAQUS based on the modal strain energy method, and modal experiments were carried out by using other equipment to obtain the cantilever structure before and after the damage Of the lower order modal strain energy, and the difference of the strain energy is taken as the damage index to identify the damage. Simulation and experimental results show that the use of modal strain can effectively damage the cantilever structure with multiple damage. Based on the verification of the validity of the method, the influence of the arrangement of measuring points, the number of sensors, the position of sensors and the modal order on the damage detection and localization of the beam structure is further analyzed. The results show that using the first three modes Then the beam structure with multiple damage can be damaged and positioned, and the positioning effect is better when the spacing of measurement points is equal to the beam width. In addition, the number of sensors has no obvious effect on the damage detection and localization.