3303 Shape Identification Method for Desired Static Deformation of Frame Structures

2014 ◽  
Vol 2014.24 (0) ◽  
pp. _3303-1_-_3303-10_
Author(s):  
Koki KAMEYAMA ◽  
Masatoshi SHIMODA
Keyword(s):  
Static Deformation ◽  
Frame Structures ◽  
Shape Identification ◽  
Identification Method

Shape Identification for Controlling the Static Deformation of Frame Structures

2014 ◽  
Author(s):  
Koki Kameyama ◽  
Masatoshi Shimoda ◽  
Takashi Morimoto
Keyword(s):  
Optimization Method ◽  
Frame Structure ◽  
Static Deformation ◽  
Free Form ◽  
Frame Structures ◽  
Shape Identification ◽  
Shape Gradient ◽  
Deformation Control ◽  
Out Of Plane ◽  
Gradient Function

The deformation control is an important design problem in the stiffness design of structures and it also enables to give a function to the structures. This paper proposes a non-parametric, or a node-based shape optimization method based on the variational method for controlling the static deformation of spatial frame structures. As the objective functional, we introduce the sum of squared error norms to the desired displacements on specified members. Under the assumption that each member varies in the out-of-plane direction to the centroidal axis, the shape gradient function and the optimality conditions are theoretically derived. The shape gradient function is applied to a gradient method in a function space with a Laplacian smoother. With this method, an optimal free-form frame structure with smoothness can be identified for a desired static deformation. The validity and effectiveness were verified through design examples.

The Directly Damaged Identification Method of Frame Structures Based on Residual Force Vector

2008 ◽  
Vol 385-387 ◽  
pp. 313-316
Author(s):  
Wan Jie Zou ◽  
Wei Lian Qu
Keyword(s):  
Damage Identification ◽  
Frame Structure ◽  
Frame Structures ◽  
Connectivity Matrix ◽  
Matrix Perturbation ◽  
Vector Equation ◽  
Force Vector ◽  
Structure Damage ◽  
Identification Method ◽  
Residual Force

By using the intrinsic character of the frame structures, a new direct damage identification method of the frame structures based on residual force vector is presented. The stiffness connectivity matrix is obtained by sensitivity analysis. The stiffness matrix perturbation of the damaged structure can be expanded by the stiffness connectivity matrix, then substituting it into residual force vector equation, the new residual force vector equation expressed by the stiffness connectivity matrix is obtained. This equation can be solved directly, so the stiffness perturbation of layers is got, by it, the damaged locations and the extents of the frame structures are identified. At last, a numerical example of a seven-layer frame structure is given, the identification result shows that, only with the first-order mode of the damaged structure, the damage can be identified accurately. Even in considering of some degreed noise of the mode parameters, the structure damage can be identified well, demonstrating the effectiveness of presented method.

AN Identification Method of Damping Matrix for Frame Structures

2011 ◽  
Vol 243-249 ◽  
pp. 967-970
Author(s):  
Sha Sha Dong ◽  
Wei Ying Wang ◽  
Fu Shun Liu ◽  
Zhi Qiang Gao
Keyword(s):  
Modal Analysis ◽  
Dynamic Characteristic ◽  
Experimental Modal Analysis ◽  
Frame Structure ◽  
Frame Structures ◽  
Order Complex ◽  
Identification Method ◽  
Damping Matrix ◽  
Complex Modes ◽  
Different Parts

Nowadays, damping is still the important dynamic characteristic that is the least understood and the most difficult to quantify. The advantage of the proposed damping matrix identification method is that several low order complex modes achieved by Experimental Modal Analysis (EMA) are capable of calculation precision. In order to identify the damping matrix, this paper also proposes a general damping matrix decompositon technique, which can be used in the situation that different parts of the structure have different damping. Then a five-story frame structure is applied to demonstrate the proposed method ,and the results obtained show the suitability of this approach for damping matrix identification in frame structures.

Study of Identification Method of Drunk Driving Based on Wavelet Analysis

ICCTP 2011 ◽  
2011 ◽  
Author(s):  
Xing-jian Zhang ◽  
Xiao-hua Zhao ◽  
Jian Rong ◽  
Shi-li Xu
Keyword(s):  
Wavelet Analysis ◽  
Drunk Driving ◽  
Identification Method
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