祁泉泉, 辛克贵. 改进的Berman-Baruch法在非比例阻尼有限元模型修正中的应用[J]. 工程力学, 2012, 29(7): 1-5. DOI: 10.6052/j.issn.1000-4750.2010.10.0743
引用本文: 祁泉泉, 辛克贵. 改进的Berman-Baruch法在非比例阻尼有限元模型修正中的应用[J]. 工程力学, 2012, 29(7): 1-5. DOI: 10.6052/j.issn.1000-4750.2010.10.0743
QI Quan-quan, XIN Ke-gui. APPLICATION OF THE IMPROVED BERMAN-BARUCH METHOD FOR MODEL UPDATING IN THE NON-PROPORTIONAL DAMPING STRUCTURE[J]. Engineering Mechanics, 2012, 29(7): 1-5. DOI: 10.6052/j.issn.1000-4750.2010.10.0743
Citation: QI Quan-quan, XIN Ke-gui. APPLICATION OF THE IMPROVED BERMAN-BARUCH METHOD FOR MODEL UPDATING IN THE NON-PROPORTIONAL DAMPING STRUCTURE[J]. Engineering Mechanics, 2012, 29(7): 1-5. DOI: 10.6052/j.issn.1000-4750.2010.10.0743

改进的Berman-Baruch法在非比例阻尼有限元模型修正中的应用

APPLICATION OF THE IMPROVED BERMAN-BARUCH METHOD FOR MODEL UPDATING IN THE NON-PROPORTIONAL DAMPING STRUCTURE

  • 摘要: 该文首先利用识别后的复模态计算出结构的正交模态,然后在Berman-Baruch优化矩阵型法(BB法)基础上提出并推导了改进的Berman-Baruch法(IBB法)。该方法定义了合理的优化目标函数,克服了BB法需要质量归一化模态振型的约束,修正后的模型可保持明确的物理意义和带状特性。该文通过一6个自由度的非比例阻尼质量弹簧阻尼(MSD)系统和实验室下的一6个自由度的框架结构模型修正的计算和比较,验证了IBB 法的有效性和实用性。

     

    Abstract: The structural normal modes were computed from the identified complex modes in this paper firstly, and then based on Berman-Baruch Method (BB) which is one of the optimal matrix methods for structural model updating, the Improved Berman-Baruch Method(IBB) was proposed and derived. A reasonable optimal project function was defined and one constraint of BB that the normalized modes with mass matrix are required was released. The updated model via IBB was more physically meaningful, and it keeps the characters of band and sparse of system matrices. Two cases were taken as examples to show the validity and availability of IBB to update the non-proportional damping structure. One was the simulated experiment with a 6-DOF mass-spring-damping system to show the little discrepancy between exact and updated models; the other one was the practical experiment with a 6-DOF frame structure in the laboratory to demonstrate that the acceleration history agrees well between the experimental data and the simulated data generated from the updated model.

     

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