摘要
提出了利用Wigner-Ville分布交叉项统计量相对变化量识别桅杆结构损伤的方法,以涪陵导航桅杆为对象进行了数值分析和试验研究。数值分析表明,利用测点损伤识别指标WCS的相对变化量,除对不同位置、不同程度的杆身局部损伤比较敏感外,对不同类型的局部损伤也能给予准确的识别。通过适当提高纤绳的初应力,可以提高损伤识别的精确度和指标对损伤的敏感程度。损伤识别试验实现了模拟损伤程度的定量,试验数据分析表明,指标WCS能有效地识别出桅杆结构不同程度的局部损伤,损伤识别所揭示的规律与数值分析的规律一致。
The relative alteration of Wigner-Ville Distribution cross-term statistic was proposed for damage detection of guyed masts. And numerical analysis and experimental study were carried out with the case of the aero-navigating guyed mast in Fuling District. It was found that not only the shaft＇s damage of different location and degree, but also the local damage of different type could be identified with the relative alteration of WCS accurately. The accuracy and sensitivity of the identification can be improved by increasing the guy＇s initial pre-tensions. The damage identification test can quantify the damage extent of simulation. And it was indicated that the WCS index can identify the local damage of guyed mast and the results of damage identification were in good agreement with those of numerical analysis.
出处
《土木建筑与环境工程》
CSCD
北大核心
2009年第4期13-18,30,共7页
Journal of Civil,Architectural & Environment Engineering
基金
总后勤部"十五"重点项目(QJ-00131)
重庆市自然科学基金资助项目(CSTC
2006BB3127)
关键词
损伤识别
桅杆
交叉项
数值分析
试验
damage detection
guyed mast
cross-term
numerical analysis
experiments
