scholarly journals Performance of the CGS six DOF Shaking Table on the Harmonic Signal Reproduction

2017 ◽  
Vol 62 (1) ◽  
pp. 102-111
Author(s):  
Abdelhalim Airouche ◽  
Hassan Aknouche ◽  
Hakim Bechtoula ◽  
Nourredine Mezouer ◽  
Abderrahmane Kibboua
Keyword(s):  
Adaptive Control ◽  
Earthquake Engineering ◽  
Harmonic Signal ◽  
Shaking Table ◽  
Experimental Procedure ◽  
Signal Tracking ◽  
Engineering Research ◽  
Control Techniques ◽  
Shaking Table Testing ◽  
Six Dof

Shaking table testing continues to play an important role in earthquake engineering research. It has been recognized as a powerful testing method to evaluate structural components and systems under realistic dynamic loads. Although it represents a very attractive experimental procedure, many technical challenges, which require attention and consideration, still remain. High fidelity in signal reproduction is the focus of the work presented in this paper. The main objective of this paper is to investigate the capabilities of adaptive control techniques based on Amplitude Phase Control (APC) and Adaptive Harmonic Cancellation (AHC) on the harmonic signal tracking performance of the shaking table. A series of 232 sinusoidal command waveforms with various frequencies and amplitudes were conducted on the shaking table of the laboratory of the National Earthquake Engineering Applied Research Center (CGS, Algeria). Experimental results are reported and recommendations on the use of these adaptive control techniques are discussed.

scholarly journals Experimental study of lead and elastomeric dampers for base isolation systems
 in laminated Neoprene bearings

1982 ◽  
Vol 15 (2) ◽  
pp. 53-67
Author(s):  
J. M. Kelly ◽  
S. B. Hodder
Keyword(s):  
Earthquake Engineering ◽  
Base Isolation ◽  
Shaking Table ◽  
Scaling Effects ◽  
Isolation System ◽  
Engineering Research ◽  
General Acceptance ◽  
Seismic Engineering ◽  
Elastomeric Dampers ◽  
Base Isolation System

This report describes a series of experiments carried out on the shaking
table at the Earthquake Simulator Laboratory of the Earthquake Engineering Research Laboratory, involving a base isolation system which incorporated multilayer isolation
bearings of Neoprene, a polychloroprene rubber. Several forms of isolation
system using the same basic bearing design but including inserts of different
materials in a central hole in each bearing were studies. The inserts were used to enhance the damping properties of the system and to improve the response. The results indicate that there are no difficulties in designing an effective isolation system in polychloroprene rubber and that the multilayer elastomeric bearings can substantially reduce the seismic loads experienced by a building and its contents. Elastomeric inserts were effective in improving the response only to a limited extent. The use of lead inserts to enhance the damping was very effective in controlling the displacement. There is an increasing interest in the use of base isolation as a way of reducing the effects of earthquakes on structures. There is general acceptance of the concept but doubts about its implementation center on the question of suitable bearings. Experiments of the kind reported here, on large models where scaling effects are minimized, can allay the fears of the seismic engineering profession that bearings may not be available.

Applications of Adaptive Control Techniques to Mineral Processes

1995 ◽  
Vol 28 (17) ◽  
pp. 249-256
Author(s):  
Massacci Paolo ◽  
Patrizi Giacomo ◽  
Recinella Marco
Keyword(s):  
Adaptive Control ◽  
Control Techniques

Failure mechanism of steel arch trusses: Shaking table testing and FEM analysis

2015 ◽  
Vol 82 ◽  
pp. 186-198 ◽  
Author(s):  
Qing-Hua Han ◽  
Ying Xu ◽  
Yan Lu ◽  
Jie Xu ◽  
Qiu-Hong Zhao
Keyword(s):  
Failure Mechanism ◽  
Fem Analysis ◽  
Shaking Table ◽  
Shaking Table Testing

A Comparative Study on Intelligent & Adaptive Control Techniques on a Nonlinear Inverted Pendulum Cart Mechanism

2021 ◽  
Author(s):  
Akhil Krishnan ◽  
Parvathy Krishna. U ◽  
Mahipal Bukya ◽  
Princy Randhawa ◽  
Dimitris Piromalis
Keyword(s):  
Adaptive Control ◽  
Comparative Study ◽  
Inverted Pendulum ◽  
Control Techniques

scholarly journals Influence of Structure on the Aseismic Stability and Dynamic Responses of Liquefiable Soil

2021 ◽  
Author(s):  
Pengfei Dou ◽  
Chengshun Xu ◽  
Xiuli Du ◽  
Su Chen
Keyword(s):  
Earthquake Engineering ◽  
Damping Ratio ◽  
Free Field ◽  
Shaking Table ◽  
Dynamic Responses ◽  
Seismic Stability ◽  
Geotechnical Earthquake Engineering ◽  
Liquefiable Soil ◽  
Porewater Pressure ◽  
Lateral Displacements

Abstract In previous major earthquakes, the damage and collapse of structures located in liquefied field which caused by site failure a common occurrence, and the problem of evaluation and disscusion on site liquefaction and the seismic stability is still a key topic in geotechnical earthquake engineering. To study the influence of the presence of structure on the seismic stability of liquefiable sites, a series of shaking table tests on liquefiable free field and non-free field with the same soil sample was carried out. It can be summarized from experimental results as following. The natural frequency of non-free field is larger and the damping ratio is smaller than that of free field. For the weak seismic loading condition, the dynamic response of sites show similar rules and trend. For the strong ground motion condition, soils in both experiments all liquefied obviously and the depth of liquefaction soil in the free field is significantly greater than that in the non-free field, besides, porewater pressure in the non-free field accumulated relately slow and the dissapited quikly from analysis of porewater pressure ratios(PPRs) in both experiments. The amplitudes of lateral displacements and acceleration of soil in the non-free field is obviously smaller than that in the free field caused by the effect of presence of the structure. In a word, the presence of structures will lead to the increase of site stiffness, site more difficult to liquefy, and the seismic stability of the non-free site is higher than that of the free site due to soil-structure interaction.

Adaptive control techniques forfrictioncompensation

Mechatronics ◽  
1999 ◽  
Vol 9 (2) ◽  
pp. 125-145 ◽  
Author(s):  
M. Feemster ◽  
P. Vedagarbha ◽  
D.M. Dawson ◽  
D. Haste
Keyword(s):  
Adaptive Control ◽  
Control Techniques
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