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    Studies on Structural Identification Method in Civil Engineering
    土木工程中结构识别方法的研究
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    Research on Application of Electromagnetic Wave Inverse Scattering for Structural Damage Identification
    电磁波逆散射在结构损伤识别中的应用研究
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    Theory on Parameters Identification of Foundation, Structure, and Foundation-Structure Interaction System
    地基、结构及其相互作用系统参数识别理论
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    Study of Structural Damage Identification Based on Wavelet Analysis
    基于小波分析的结构损伤识别方法研究
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    Methods of Structural Damage Identification from Sparse Modal Response
    基于稀疏模态响应的结构损伤识别方法
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    Theoretical Study and Application of Damage Assessment Method Based on Probability Theory
    基于概率可靠度的结构损伤识别理论研究及应用
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    Verifications of Inelastic Seismic Response Performance of Reinforced Concrete Frame and Frame-wall Structures
    钢筋混凝土框架和框架—剪力墙结构非弹性地震反应性态的识别
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    Parameters Estimation for Liquid Sloshing Equivalent Mechanical Models
    液体晃动等效力学模型的参数识别
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    Computational System Indentification and Structural Modelling
    计算系统识别与结构模型化
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    A Method for Shape Estimation or piles by Using of Measured Impulse Response Date of Pile Head
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  identification
Identification of Ligands for the Orphan Nuclear Receptor GCNF
      
CHEMICAL GENOMICS FOR FASTAND INTEGRATED TARGET IDENTIFICATION AND LEAD OPTIMIZATION
      
The 3D QSAR studies using Apex 3D expert system led to the identification of the pharmacophore in terms of common biophoric sites and secondary sites for interacting with PPARγ receptors.
      
Identification of Novel Non-nucleoside Reverse Transcriptase Inhibitors Using Fragment-based Lead Generation
      
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In reccnt years the method of modal synthesis by compo- nent parts has been applied in the calculation of dynamic responses of ship's hull structure in some advanced shipbuil- ding nations. By dividing the entire ship into component parts, such as superstructure, mast, stern part, hull girder, etc. and synthetizing the dynamic characters of the compone- nts which are previously calculated separately, one can obtain the dynamic characters of the whole hull structure. In this way the necessity of large capacity...

In reccnt years the method of modal synthesis by compo- nent parts has been applied in the calculation of dynamic responses of ship's hull structure in some advanced shipbuil- ding nations. By dividing the entire ship into component parts, such as superstructure, mast, stern part, hull girder, etc. and synthetizing the dynamic characters of the compone- nts which are previously calculated separately, one can obtain the dynamic characters of the whole hull structure. In this way the necessity of large capacity electronic computers will be eluded successfully. It enables most of the enterprises which have only got medlum computers or mini-computers to manage the dynamic calculation of large complex structures. Based on the principle of dynamic transformation and modal analysis to superelments, the authors deduced the sup- erelement method of modal synthesis (SMMS), a new method for dynamic substructures, and thus surmounted the difficulties in the combination of the ordinary modal synthesis with the general finite element analysis and improved the accuracy of calculation by static and dynamic reduction put forward by Guyan, Kuhar, etc. The present SMMS combines the modal systhesis method with reduced impedance of substructures, in which normal modes of several orders at fixed interfacing bounderies of su- perelements are remained in the condensed dynamic stiffness matrix of superelements in order to guarantee the accǜracy of the calculation. After getting the information of the dynamic reduction of superelements, by using the same procedure of interfacing as by FEM。we can acquire the dynamic stiffness matrix which depends on the natural frequencies of the sy- stem. Then solving the nonlinear equations, we will get the eigenvalues of the entire system. By the way the calculating principle and solving steps of the nonlinear eigenvalues are specially related in the paper. They are key links in the SMMS. The authours set up the general program for SMMS sui- table to be used in the small capacity computer type 108. This program was examined by calculating a typicl problem of two-story framework in space which already has accurate theoretical solutions and also test results. The outcomes are satisfactory. Besides, the SMMS is used to calculated the mo- del of a 5000-ton large hatch barge by applying the symmetric and counter symmetric principle to a quarter of the modal which has 456 degrees of freedom. This part is again divided into four superelements, each of them consiting of a structural hold segment in space constructed by plates and beams of 132 or 108 degrees of freedom separately. The dynamic feature of the entire barge hull is acquired after synthesising the modes of hold segments. The calculated results are compared with the experimental values obtained from both tests properly carried out by using structural system identification method and Moiré interference method for lateral measuring of vib- ration, and the coincidency is reasonably satisfactory.

近几年来,在一些先进的造船工业国家,部件模态综合法在船体结构动态计算中已开始应用。通过将整船分成上层建筑、桅杆、船体梁等若干部分,分别计算各部件的动态特性然后加以综合,可得到整船的结构动态特性。这就有效地解决了计算机容量不足的问题,使绝大部分拥有中小型计算机的企业对这类大型复杂结构的动态计算成为可能。本文根据动力变换原理和超单元的模态分析,导出了一种新的动态子结构法——模态综合超单元法,克服了一般模态综合法与通用有限元法技术相结合的困难,改进了Guyan、Kuhar等人提出的静力、动力缩聚计算的精度。本文提出的模态综合超单元法是将模态综合法与阻抗匹配法结合起来的一种新的动态子结构法,在超单元的缩聚动刚度矩阵中保留了若干阶的固定对接主模态,从而保证了计算精度。在取得超单元的动态缩聚信息后,采用与有限元相同的对接步骤,得到缩聚了的、依赖于系统频率的动刚度矩阵。解此非线性特征方程,即得到所求系统的特征值。本文对非线性特征值的计算原理和步骤也作了专门阐述,这在动态子结构法中是十分关键的一步。根据本方法的计算原理,在我所国产的108计算机上建立了通用程序,并对已有精确解和试验结果的立体双层框架进行了计算考核,结果吻合良...

近几年来,在一些先进的造船工业国家,部件模态综合法在船体结构动态计算中已开始应用。通过将整船分成上层建筑、桅杆、船体梁等若干部分,分别计算各部件的动态特性然后加以综合,可得到整船的结构动态特性。这就有效地解决了计算机容量不足的问题,使绝大部分拥有中小型计算机的企业对这类大型复杂结构的动态计算成为可能。本文根据动力变换原理和超单元的模态分析,导出了一种新的动态子结构法——模态综合超单元法,克服了一般模态综合法与通用有限元法技术相结合的困难,改进了Guyan、Kuhar等人提出的静力、动力缩聚计算的精度。本文提出的模态综合超单元法是将模态综合法与阻抗匹配法结合起来的一种新的动态子结构法,在超单元的缩聚动刚度矩阵中保留了若干阶的固定对接主模态,从而保证了计算精度。在取得超单元的动态缩聚信息后,采用与有限元相同的对接步骤,得到缩聚了的、依赖于系统频率的动刚度矩阵。解此非线性特征方程,即得到所求系统的特征值。本文对非线性特征值的计算原理和步骤也作了专门阐述,这在动态子结构法中是十分关键的一步。根据本方法的计算原理,在我所国产的108计算机上建立了通用程序,并对已有精确解和试验结果的立体双层框架进行了计算考核,结果吻合良好。然后用本方法对5000吨舱口驳模型进行了计算,利用对称和反对称原理计算了具有456个自由度的驳船模型的四分之一部分,将该部分分成四个超单元,每个超单元分别由132个自由度或108个自由度的膜梁组合结构立体舱段组成,用子空间联立迭代法计算得到每个舱段的模态,加以综合后求得整船的动态特性。最后将计算结果与对该模型采用先进的模态识别试验(击锤法)及Molré干涉横向测振试验结果进行了比较,一致性也是满意的。

A dynamic test has been made by using a 1/10 scale model of the Tianjin Orthopaedic Hospital. In the test, mechanical impedance of the structure was measured and modal parameters were identified by the, component method of mechanical impedance. The modal parameters before and after cracking of the side wall are given in this paper. Sonie important problems we should pay attention in the experiment and the analysis of data arc discussed.

作者对比例尺为10:1的天津骨科医院模型进行了动力实验,测量了结构的机械阻抗,识别出了各阶的模态参数,并给出了侧墙出现裂纹前后系统的模型参数,此外还讨论了实验和分析中的某些应当注意的问题。

The measuring method of dynamic characteristics in structures is described in this paper.Some formulae to define the modal parameters by diagram ana- lysis method are, synthesized in a list. Some experiences to identify the complex modal parameters by diagram analysis method are summarized. In this paper, the grounds to judge the reliability on experimental data and to select the experimental data are proposed. The program to identify the complex modal parameters is designed here. The comparison results to identify...

The measuring method of dynamic characteristics in structures is described in this paper.Some formulae to define the modal parameters by diagram ana- lysis method are, synthesized in a list. Some experiences to identify the complex modal parameters by diagram analysis method are summarized. In this paper, the grounds to judge the reliability on experimental data and to select the experimental data are proposed. The program to identify the complex modal parameters is designed here. The comparison results to identify the vibration. modal parameters by diagram analysis method and computer analysis method for the steam turbine foundation model of 600,000KW made in China are given. The problem of forming a mathematical model by test data is also discussed, and the computing formulae of complex modal response value for the disturbing forces acting on single-point or multi-points according to practical cases of power foundation are also given in this paper.

本文概述了结构动力特性的测试方法;列表综合了用图解分析法确定模态参数的 公式,总结了运用图解法识别复模态参数的实践体会,并提出了判断实测数据可靠性 与选择实测数据的依据;介绍了模态参数识别程序;列出了运用图解分析法和计算机 分析法对国产60万■汽机基础模型进行振动模态参数识别的对比结果。文中还讨论 了关于利用实测数据建立数学模型问题,并结合动力基础实际给出了在单点扰力及多 点扰力下.复模态响应值的计算公式。

 
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