Verification of the Usefulness of Eccentric Structure in the Magnetic Encoders Using a Multipole Magnet

This paper conducts a parametric study on the seismic response of multistorey bidirectional eccentric structures from elastic stage to inelastic stage. Based on a simplified multistorey bidirectional eccentric model composed of bidirectional lateral load-resisting members, a general law is proposed for three-stage natural frequency variation behaviour from elastic stage to inelastic stage of eccentric frame structures with different layers. Different simplification treatments are conducted on each stage and the three stable parameter analysis stages are defined. The corresponding dynamic stiffness matrices and motion equations in different loading stages are derived. On this basis, a parametric analysis of seismic response of a three-storey bidirectional regular eccentric structure from elastic stage to inelastic stage is conducted. Effects of the uncoupled torsion to lateral frequency ratios (Ω) and bidirectional eccentricities on the seismic responses are investigated. The results reveal that as Ω increases, translational displacement in the load direction first decreases and then increases; meanwhile, the displacement perpendicular to load direction and torsion displacement first rise and then decrease sharply. When Ω=1.1, the coupling effect between the translation in the load direction and the torsion is at its strongest condition. Increasing the eccentricities leads to a decrease in the displacement in the load direction as well as an increase in the displacement perpendicular to load direction and torsion displacement. Variation regularity of inelastic seismic response is remarkably different from that in elastic stage. The lateral-torsional coupling effect of the bidirectional eccentric structure is closely related to both the period ratio and the bidirectional eccentricities.

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Earthquake reduction behaviors of viscous fluid dampers for soil-eccentric structure interaction system

2010 International Conference on Mechanic Automation and Control Engineering ◽

10.1109/mace.2010.5536327 ◽

2010 ◽

Author(s):

Li Chun ◽

Gu Xinhua

Keyword(s):

Viscous Fluid ◽

Structure Interaction ◽

Interaction System ◽

Fluid Dampers ◽

Viscous Fluid Dampers ◽

Eccentric Structure

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Numerical Analysis of Torsional Effect of the Eccentric Structure Caused by the Running Train

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.71-78.1329 ◽

2011 ◽

Vol 71-78 ◽

pp. 1329-1338

Author(s):

Bi Tao Wu ◽

Hua Xi Lu ◽

Ping Ying Liang

Keyword(s):

Finite Element ◽

Numerical Analysis ◽

Dynamic Model ◽

Horizontal Displacement ◽

Asymmetric Structure ◽

Eccentricity Ratio ◽

Finite Element Software ◽

Horizontal Acceleration ◽

Torsion Effect ◽

Eccentric Structure

Application of finite element software ANSYS coupled with the train-ground dynamic model is developed to predict the torsion effect of asymmetric structure. Respectively analyze on eccentricity ratio is 0, 0.1, 0.3, 0.5, 0.7, 0.9, and 1.0. Results show that the ground vibrations by the train are slight. Eccentricity of the structure has certain effect on horizontal displacement, horizontal angle displacement, and floor horizontal acceleration.

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The Similar Relationship Research of the L-Type Eccentric Structure Model on Vibration Test

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.724.256 ◽

2015 ◽

Vol 724 ◽

pp. 256-260

Author(s):

Ai Jun Chen ◽

Xiao Mei Jiang ◽

Guo Jing He

Keyword(s):

Model Test ◽

Similarity Theory ◽

Frame Structure ◽

Seismic Action ◽

Test Model ◽

Structure Model ◽

Correct Formula ◽

Important Means ◽

Eccentric Structure ◽

Scaled Models

Vibroplatform test is an important means of testing the dynamic characteristics of the laboratory sim-ulating structure under seismic action. For structure whose volume and weight exceed the limits of vibroplatfor-m tests is usually carried out through model test according to the similarity theory. So how to deal with the simil-ar relationships among the test model and how to verify thethe rationality of vibration control strategy through testing results become the key and fundamentalproblems. 1:15 scaled models will be made through the dimensional analysis based on a 4 layersL-shaped frame structure as the proto-type , which are made from micro-concrete, aluminum alloyand plexiglass. SFMT sap2000 is used to make a dynamic analysis to get the values of period,acceleration, velocity, etc. Comparing the results of prototype inferred from model through similarrelationship with theoretica-l values of prototype to get the correct formula and confirm the bestscaled model and then provide references f-or model test later.

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