D-S证据理论的改进算法及其在导墙结构损伤定位中的应用验证

An improved method based on D-S evidence theory and its verification in damage location for guide wall structure

针对D-S证据理论组合规则存在的不足,根据导墙结构在水流荷载作用下的振动特性建立多种损伤定位指标,应用损伤前、后的实测响应分别计算各指标的识别结果,对结构的损伤位置进行初步判断,利用D-S证据理论的改进算法对各指标的识别结果进行融合计算,得出结构的损伤位置。模型试验结果表明:D-S证据理论的改进算法能够利用较少的证据获得正确的辨识结果,避免了单一指标由于传感器自身条件、噪声等因素所引起的错误判断,有效地降低了错误证据对最终融合结果的影响,适用于导墙结构的损伤定位研究。

Due to some deficiencies in the combination rule of D-S evidence theory, some dynamic signatures for damage location are determined according to the vibration characteristics of guide wall structure induced by flood discharge. The responses measured from health state and damage state are utilized to respectively calculate these dynamic signatures, which are applied to preliminary judgment of damage location. And the identification results are regarded as evidences for fusion decision to decide the damage location by using the improved D-S evidence theory. The results demonstrate that the accurate decision can be obtained based on few evidences by utilizing the method proposed, the errors originated from sensor and noise are avoided, and the influence on final fusion decision of the wrong evidence is effectively reduced. The method based on dynamic signatures and improved D-S evidence theory is applicable to damage localization.