飞艇骨架结构动态损伤识别方法
收稿日期: 2015-11-02
修回日期: 2016-03-10
网络出版日期: 2016-03-28
基金资助
中央高校基本科研业务费专项资金（HIT.MKSTISP.201609）
Dynamic damage detection methods for airship framework structure
Received date: 2015-11-02
Revised date: 2016-03-10
Online published: 2016-03-28
Supported by
The Fundamental Research Funds for the Central Universities (HIT.MKSTISP.201609)
针对飞艇骨架结构中损伤引起的模态跃迁现象导致无法通过匹配损伤前后动态特性参数变化来识别损伤的难题，给出3种只基于损伤后振动响应信息进行损伤识别的动态方法。通过模态分析方法获得结构的模态参数，分别推导模态振型曲率法、均布载荷面曲率法和虚拟轴向应变法等3种损伤识别算法。定义损伤指标，并根据损伤指标局部峰值来识别和定位损伤杆件。以半硬式飞艇常见狭长构型三角截面碳纤维复合材料桁架为例，结合有限元法和自编MATLAB程序进行损伤识别仿真研究，影响参数包括损伤类型、损伤位置、损伤程度和噪声量级等，最后对损伤识别算法的有效性进行试验验证。结果表明新损伤识别方法对损伤敏感，在环境噪声工况下能准确识别和定位单个和多个损伤杆件。文中方法均基于结构整体振动信息进行损伤杆件识别，将来可用于构造飞艇骨架实时结构健康监测系统。
余建新 , 卫剑征 , 谭惠丰 . 飞艇骨架结构动态损伤识别方法[J]. 航空学报, 2016 , 37(11) : 3385 -3394 . DOI: 10.7527/S1000-6893.2016.0074
The mode jumping phenomenon with the presence of damage in airship framework structure made traditional damage detection methods by matching structural dynamic parameters before and after damage failed. Hence, three dynamic methods were developed for damage detection only using global vibration response after damage. Modal parameters of structures were obtained through modal analysis method, and then three damage detection methods named mode shape curvature, uniform load surface curvature and virtual axial strain were proposed. New damage indicators were defined and the damaged members were localized by local peaks of damage indicators. An example was given with a typical large-scale tri-angular carbon fiber reinforced polymer composite space truss structure. It was widely used for semi-rigidity airship framework structure. The whole damage detection processes were simulated combined with finite element method and self-defined MATLAB program, and the influence factors include damage types, damage locations, damage severities, noise levels, etc. An experimental testing was conducted to verify the proposed damage detection methods. All results show that the proposed damage indicators are sensitive to damage and capable of identifying and locating single and multiple damaged members under environmental noise condition. The proposed methods based on structural global vibration thus could be used for real-time structural health monitoring system for airship framework in the future.
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