Study on identification of damping system based on motion state

2020 ◽  
Vol 23 (10) ◽  
pp. 2136-2148
Author(s):  
Zhiying Zhang ◽  
Ying Li ◽  
Hongyang Wei ◽  
Qiji Ze
Keyword(s):  
Soil Structure ◽  
Seismic Isolation ◽  
Correct Identification ◽  
Analysis Method ◽  
Spatial Continuity ◽  
Identification Method ◽  
Motion State ◽  
Practical Engineering ◽  
Whiplash Effect ◽  
Damping Systems

A correct identification for damping system is the foundation to select the dynamic analysis method. In this study, the differences between motion states in different damping systems are investigated initially. A theoretical identification method based on motion state is proposed with the spatial continuity of the motion, and the coordination of the motion state is used as the objective function. In addition, dynamic simulation results of a set of plates are compared to clarify the physical interpretation of the identification method. The method is applied to three practical examples with recognized damping system, including the motion of seismic isolation bearings, whiplash effect, semi-active controlling systems, and soil–structure interaction system. The analysis results verify that the proposed identification method is feasible in practical engineering.

Experimental Study on Non-Perpendicular Frame Structure of Tall Building

2008 ◽  
Vol 400-402 ◽  
pp. 593-598
Author(s):  
Wei Xing Shi ◽  
Cheng Qing Liu ◽  
Xi Lin Lu ◽  
Song Zhang ◽  
Ying Zhou
Keyword(s):  
Similarity Theory ◽  
Structural Type ◽  
Shaking Table ◽  
Frame Structure ◽  
Scale Model ◽  
Prototype Structure ◽  
Table Model ◽  
Practical Engineering ◽  
Whiplash Effect ◽  
Shaking Table Model Test

A shaking table model test is conducted for Guangzhou West Tower to study its seismic behavior in State Key Laboratory for Disaster Reduction in Civil Engineering at Tongji University. Guangzhou West Tower adopts a new structure system and the significant characteristic of this system is the non-perpendicular frame arranged around the building, acting both as columns and bracings. Based on the similarity theory and member equivalent principle，a 1/80 scale model of this building is made of polymethyl methacrylate(PMMA). The model’s dynamic characteristics, earthquake-resistant behavior, responses of acceleration and deformation under different wave peak values are investigated, then the seismic responses of the prototype structure are deduced and analyzed. The whiplash effect of the prototype structure is studied, and the weak position of the structure is found out. The experiment results demonstrate that it is feasible to apply this structural type to practical engineering. Finally, some suggestions for the engineering design of the prototype structure are put forward.

A Point Set Analysis Method for Hull Blocks Based on CPD and Engineering Constraints

2020 ◽  
Vol 36 (02) ◽  
pp. 105-114
Author(s):  
Guan Guan ◽  
Hongling Liao
Keyword(s):  
Data Analysis ◽  
Multiobjective Optimization ◽  
Error Distribution ◽  
Analysis Method ◽  
Practical Engineering ◽  
Coherent Point Drift ◽  
Point Set ◽  
Optimal Data Analysis ◽  
Important Basis ◽  
Engineering Constraints

A point set analysis method considering the practical engineering constraints has been proposed in this article. First, the coherent point drift method was used to obtain the initial values of data analysis. Second, the error distribution in different directions was expressed by weight vectors. Last, the multiobjective optimization model was built and the engineering constrains were introduced into the multioptimization objective function to achieve the optimal data analysis results. The experimental results proved that the method could obtain the reasonable data analysis results, which met the engineering constraints. It provides the important basis for the subsequent assembly.

Calculation and Analysis of a Tall Building Seismic Isolation Design

2013 ◽  
Vol 353-356 ◽  
pp. 2177-2180
Author(s):  
Hao Ming Cai ◽  
Zhong Tao ◽  
Xin Li Cao
Keyword(s):  
Seismic Design ◽  
Seismic Isolation ◽  
Time History ◽  
Tall Building ◽  
Wall Structure ◽  
Analysis Method ◽  
History Analysis ◽  
Story Drift ◽  
Rare Earthquake ◽  
Building Project

In this paper, we calculate and analyze a tall building project of seismic isolation design. It is a frame-shear wall structure, which has twelve stories on the ground. And then, we use the time history analysis method to calculate the isolation structure. It is found that isolation equipment can extend the period of the structure, reduce the story drift in frequency earthquake. And it also can control the response of the structure. In rare earthquake, the story drift can meet the demand of unclasped; the displacement and force of the equipment can satisfy the demand of the code for seismic design of building.

48″900lb Full-Welded Ball Valve Wall Thickness Optimal Design

2013 ◽  
Vol 753-755 ◽  
pp. 1826-1829
Author(s):  
Chun Li Mo ◽  
Gang Li ◽  
Yong Chen
Keyword(s):  
Stress Analysis ◽  
Wall Thickness ◽  
Oil And Gas ◽  
Engineering Application ◽  
Ball Valve ◽  
Analysis Method ◽  
Theoretical Support ◽  
Theoretical Design ◽  
Practical Engineering ◽  
Design Pressure

Fully-welded ball valve has been applied in large oil and gas pipelines, and its quality is directly related to the safety of the transportation of national energy. The wall thickness of 48900lb ball valve is greater than theoretical design thickness. In this article, FEM software was used to design minimum wall thickness using linear stress analysis method. Though changing wall thickness under design pressure, the minimum wall was 95mm which calculated by linear stress analysis method can provide theoretical support for practical engineering application.

scholarly journals An identification method of the weak link of stiffness for cantilever beam structure

2020 ◽  
Vol 103 (3) ◽  
pp. 003685042095267
Author(s):  
Tieneng Guo ◽  
Lingjun Meng ◽  
Jinxuan Cao ◽  
Chunsheng Bai
Keyword(s):  
Machine Tool ◽  
Cantilever Beam ◽  
Weak Link ◽  
Difficult Problem ◽  
Beam Structure ◽  
Identification Method ◽  
Acceleration Data ◽  
Cantilever Structure ◽  
Practical Engineering ◽  
Value Decomposition

To find the weak link of the structural stiffness is important to improve machine tool stiffness. However, how to overcome the static deformation with difficulty acquisition is a difficult problem in machine tool structure. The article takes the cantilever beam structure as a numerical example, the weak link is modeled as EA reduction in stiffness. Thorough finite element simulations are performed to assess the robustness and limitations of the method in several scenarios with single and multiple weaknesses. The sensors are used to acquire the acceleration data, the structural modal parameters are obtained by the singular value decomposition technique, and the dynamic characteristics are systematically reconstructed by using the modal state-space method to obtain static stiffness. Then, an identification method proposed by measured data and reconstructed data to identify the weak link of stiffness of the cantilever structure. Furthermore, the comparison of numerical and experimental results validate the correctness and effectiveness of this method. The research has certain practical engineering value and provides an accurate guidance for the optimization of machine tool stiffness.

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