欢迎您！东篱公司
退出
-
申报数据库
-
立项数据库
-
成果数据库
-
项目获奖数据库
中文摘要：
针对局部子结构为修正对象的情况，提出了基于时间序列的约束子结构修正法，从而只利用整体结构中局部子结构部分的自由响应或者随机响应就可以精确修正子结构模型。该方法依据线性结构的线性叠加原理，将一组长的子结构响应的时间序列延时划分为若干组子时间序列，然后利用这些子时间序列的线性组合，限制子结构边界的响应，从而隔离整体结构对子结构的影响，构造出约束子结构的响应，进而通过约束子结构的模态识别和模型修正实现对局部子结构的修正。以十跨桁架模型为例，分别利用子结构位置的随机响应和自由响应修正子结构，验证了所述方法的有效性，并分析了噪声对方法的影响。
英文摘要：
A modal updating method based on local time series is proposed, such that the local substructure can be updated effectively by the free response or the stochastic response at the corresponding substructural location of the whole structure. The Isolated Substructure refers to a new simple and independent structure, equivalent to the concerned substructure, which is isolated from the global structure by numerically constraining the substructure boundary response according to the superposition theorem of linear elastic structures. It is significant especially when only part of the structure needs to be modified. In this method, firstly a long discrete response of the substructure is divided into several sub-time series with delayed time steps in turn ; then the responses of the substructural boundary are restricted by the linear combination of the sub-time series, thereby the vibration of the Isolated Substructure is constructed by isolating the influence from the whole structure; Lastly the local substructure is updated through the model identification and model updating of the Isolated Substructure, which con- tains fewer elements and can be updated easier and faster. The computational accuracy is improved by eliminating the influences from the other parts of the structure. Numerical example of a plane truss is given to demonstrate the effectiveness of this method by utilizing the accelerations of free vibration and stochastic displacement responses. Moreover, the result is also acceptable when 5 % noise is taken into consideration.
同期刊论文项目
同项目期刊论文
Electrode design, measuring method and data acquisition system of carbon fiber cement paste piezores
Experimental study on the contribution of the quantum tunneling effect to the improvement of the con
Development of a wireless stress/strain measurement system integrated with pressure-sensitive nickel
Experimental study on use of nickel powder-filled cement-based composite for fabrication of piezores
Piezoresistive characteristic model of nickel/cement composites based on field emission effect and i
Fiber-reinforced polymer-packaged optical fiber sensors based on Brillouin optical time domain analy
A Smart Steel Strand for the Evaluation of Prestress Loss Distribution in Post-tensioned Concrete St
Effect of compressive strain on electrical resistivity of carbon black-filled cement-based composite
Sensor technology innovation for the advancement of structural health monitoring: a strategic progra
Environmental variability study on the measured responses of Runyang Cable-stayed Bridge using wavel
Accurate stress analysis on rigid central buckle of long-span suspension bridges based on submodel m
Finite element model updating for the Runyang Cable-stayed Bridge tower using ambient vibration test
期刊信息
位置：