基于能量系数-有效独立法的桥梁结构传感器优化布置  

Optimal placement of sensors for a bridge structure based on energy coefficient-effective independence method

作　　者：杨雅勋[1] 郝宪武[1] 孙磊[1] 

机构地区：[1]长安大学旧桥检测与加固技术交通行业,西安710064

出　　处：《振动与冲击》2010年第11期119-123,134,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金项目(50608005);中央高校基本科研业务费专项资金(CHD2010JC122);长安大学基础研究支持计划专项基金资助

摘　　要：为了解决桥梁结构健康监测中的传感器优化布置问题,以简支钢桁架梁桥为研究对象,以反映节点自由度模态应变能的系数来修正反映最大线性无关的有效独立法,提出了基于能量系数-有效独立法的传感器优化布置算法,使传感器布置方案进一步优化。实例分析表明,采用该方法所得的传感器布置方案用多种准则进行评价的结果都较好,既能保证测量振型向量的正交性,又能保证扩阶振型的准确性,并且有较强的抗噪声性能,是一种适合桥梁结构的较为理想的传感器优化布置算法。In order to solve the problem about optimal placement of sensons in bridge structure health monitoring,taking a simply supported steel truss bridge as the study object,the improved optimal sensor placement method based on energy coefficient-effective independence method was proposed,which compensated the weaknesses of the traditional methods.Using the coefficient reflecting the node DOF modal strain energy,the proposed method could modify the effective independence method reflecting the maximum linear independence,and further optimize the sensor placement designs.The analysis of an example showed that the evaluations of the designs are good,and the method can ensure the orthogonality of the measured vibration shape vectors,and can also ensure the accuracy of the expanded vibration shape vectors and has better anti-noise ability,it is an ideal method for bridge structures.

关 键 词：桥梁工程 传感器优化布置 能量系数-有效独立法 模态应变能 模态保证准则 

分 类 号：U446[建筑科学—桥梁与隧道工程]