Optimal location of structural control devices: a progressive collapse analogy

1992 ◽  
Author(s):  
J. Holnicki-Szulc
Keyword(s):  
Structural Control ◽  
Progressive Collapse ◽  
Optimal Location ◽  
Control Devices

A Reliability Assessment Model for MR Damper Components within a Smart Structural Control Scheme

2008 ◽  
Vol 56 ◽  
pp. 218-224
Author(s):  
Maguid H.M. Hassan
Keyword(s):  
Structural Control ◽  
Inverse Dynamics ◽  
Mr Damper ◽  
Assessment Model ◽  
Resistance Force ◽  
Mr Dampers ◽  
Control Scheme ◽  
Smart Control ◽  
Control Devices ◽  
Magneto Rheological

Smart control devices have gained a wide interest in the seismic research community in recent years. Such interest is triggered by the fact that these devices are capable of adjusting their characteristics and/or properties in order to counter act adverse effects. Magneto-Rheological (MR) dampers have emerged as one of a range of promising smart control devices, being considered for seismic applications. However, the reliability of such devices, as a component within a smart structural control scheme, still pause a viable question. In this paper, the reliability of MR dampers, employed as devices within a smart structural control system, is investigated. An integrated smart control setup is proposed for that purpose. The system comprises a smart controller, which employs a single MR damper to improve the seismic response of a single-degree-of-freedom system. The smart controller, in addition to, a model of the MR damper, is utilized in estimating the damper resistance force available to the system. On the other hand, an inverse dynamics model is utilized in evaluating the required damper resistance force necessary to maintain a predefined displacement pattern. The required and supplied forces are, then, utilized in evaluating the reliability of the MR damper. This is the first in a series of studies that aim to explore the effect of other smart control techniques such as, neural networks and neuro fuzzy controllers, on the reliability of MR dampers.

scholarly journals Recent Advances in Bidirectional Modeling and Structural Control

2016 ◽  
Vol 2016 ◽  
pp. 1-17 ◽  
Author(s):  
Satyam Paul ◽  
Wen Yu ◽  
Xiaoou Li
Keyword(s):  
Control Systems ◽  
Structural Control ◽  
Seismic Waves ◽  
Control Strategies ◽  
Optimal Placement ◽  
Modeling And Control ◽  
Control Devices ◽  
Identification Techniques ◽  
And Control ◽  
Bidirectional Modeling

This paper provides an overview of building structure modeling and control under bidirectional seismic waves. It focuses on different types of bidirectional control devices, control strategies, and bidirectional sensors used in structural control systems. This paper also highlights the various issues like system identification techniques, the time-delay in the system, estimation of velocity and position from acceleration signals, and optimal placement of the sensors and control devices. The importance of control devices and its applications to minimize bidirectional vibrations has been illustrated. Finally, the applications of structural control systems in real buildings and their performance have been reviewed.

scholarly journals A simple hybrid testing approach for dynamic analysis of civil structural control devices

2009 ◽  
Vol 1 (4) ◽  
pp. 288
Author(s):  
J. Geoffrey Chase ◽  
Xiao Qi Chen ◽  
Kerry J. Mulligan ◽  
Geoffrey W. Rodgers ◽  
Rodney B. Elliott
Keyword(s):  
Dynamic Analysis ◽  
Structural Control ◽  
Hybrid Testing ◽  
Control Devices ◽  
Testing Approach

scholarly journals Analysis of the Effects of the Location of Passive Control Devices on the Platform of a Floating Wind Turbine

Energies ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2850
Author(s):  
Antonio Galán-Lavado ◽  
Matilde Santos
Keyword(s):  
Wind Turbine ◽  
Structural Control ◽  
Passive Control ◽  
Offshore Wind ◽  
Energy Devices ◽  
Hard Constraints ◽  
Marine Energy ◽  
Floating Offshore Wind Turbines ◽  
Control Devices ◽  
The Stability

Floating offshore wind turbines (FOWT) are subjected to strong loads, mainly due to wind and waves. These disturbances cause undesirable vibrations that affect the structure of these devices, increasing the fatigue and reducing its energy efficiency. Among others, a possible way to enhance the performance of these wind energy devices installed in deep waters is to combine them with other marine energy systems, which may, in addition, improve its stability. The purpose of this work is to analyze the effects that installing some devices on the platform of a barge-type wind turbine have on the vibrations of the structure. To do so, two passive control devices, TMD (Tuned Mass Damper), have been installed on the platform of the floating device, with different positions and orientations. TMDs are usually installed in the nacelle or in the tower, which imposes space, weight, and size hard constraints. An analysis has been carried out, using the FAST software model of the NREL-5MW FOWT. The results of the suppression rate of the tower top displacement and the platform pitch have been obtained for different locations of the structural control devices. They have been compared with the system without TMD. As a conclusion, it is possible to say that these passive devices can improve the stability of the FOWT and reduce the vibrations of the marine turbine. However, it is indispensable to carry out a previous analysis to find the optimal orientation and position of the TMDs on the platform.

Study on integrated response-based adaptive strategies for control and placement optimization of multiple magneto-rheological dampers-controlled structure under seismic excitations

2021 ◽  
pp. 107754632110004
Author(s):  
Zubair R Wani ◽  
Manzoor Tantray
Keyword(s):  
Structural Control ◽  
Control Algorithm ◽  
Control Strategies ◽  
Adaptive Strategies ◽  
Performance Criteria ◽  
Optimal Placement ◽  
Design Algorithm ◽  
Performance Objective ◽  
Control Devices ◽  
Magneto Rheological

The application and optimization of control systems with multiple magneto-rheological dampers integrated into a civil engineering structure is a challenging task. The performance of the control system is strongly linked with the location and arrangement of control devices, and the optimal placement of control devices is inherently linked with the performance objective of the control algorithm. Therefore, for semi-active control devices, the placement algorithm should be well rooted within the control algorithm, for effective structural control. This article proposes response-based adaptive control strategies embedded with the device location optimization algorithm. The acceleration and inter-story drift responses of the structure are considered as the performance objective for two separate control strategies. The flexibility of this approach lies in the fact that the design algorithm for control and location of magneto-rheological dampers can be engineered based on the performance criteria of the system. This study involves numerical simulation of an actual five-story framed structure. The simulation results indicated that the seismic performance of the structure is strongly linked with the number, placement of the magneto-rheological damper, and the performance objective of the control strategy used. Also, the configuration and corresponding control provided by the response-based adaptive strategies performed better than the configuration predicted by the benchmark genetic algorithm using the H2/LQG controller.

scholarly journals Seismic Simulation Analysis for 2-story Wooden Houses with Visco-Elastic Structural Control Devices

2015 ◽  
Vol 15 (7) ◽  
pp. 7_253-7_260
Author(s):  
Toichiro WATANABE ◽  
Toshiaki SATO ◽  
Takenori HIDA ◽  
Michio IGUCHI ◽  
Yuichi MASAKI ◽  
...  
Keyword(s):  
Structural Control ◽  
Simulation Analysis ◽  
Seismic Simulation ◽  
Control Devices

APPLICATION OF THE MR LIQUIDS IN SEMI-ACTIVE CONTROL DEVICES

2003 ◽  
Vol 03 (01) ◽  
pp. 55-70 ◽  
Author(s):  
ALESSANDRO BARATTA ◽  
OTTAVIA CORBI
Keyword(s):  
Magnetic Field ◽  
Stress State ◽  
Control Systems ◽  
Carrying Capacity ◽  
Structural Control ◽  
Load Carrying Capacity ◽  
Load Carrying ◽  
Control Devices ◽  
Semi Solid ◽  
Magneto Rheological

Magneto-rheological liquids are controllable liquids that under the action of a magnetic field can reversibly pass from the linear viscous liquid state with free-flow to the semi-solid one with a controlled stress-state. They are composed of typically non-colloidal magnetic micronized particles and possess a load carrying capacity higher than other, more controllable, fluids, such as electro-rheological liquids; moreover they are less sensitive to impurities and contaminations that may possibly occur in manufacturing. in the paper, the most suitable models for simulation of such devices are investigated with emphasis on evaluation of their efficiency as structural control systems.

scholarly journals Seismic vibration control using a novel inerto-elastic damper

2018 ◽  
Vol 211 ◽  
pp. 14003
Author(s):  
Mahdi Abdeddaim ◽  
Arnav A. Kasar ◽  
Nassim Djedoui
Keyword(s):  
Structural Control ◽  
Structural Response ◽  
Spring Stiffness ◽  
Optimal Parameters ◽  
Seismic Vibration ◽  
Base Shear ◽  
Seismic Excitations ◽  
Control Devices ◽  
Elastic Spring ◽  
Quantities Of Interest

The use of advanced structural control devices is an effective engineering solution to reduce earthquake induced damages to structures. Owing to rapid advancement in technology and persistent research efforts, a variety of control devices have been developed and successfully implemented. Quite recently, a new passive damper, called inerter has been introduced, which is capable of developing a fictive mass. This study presents a novel inerto-elastic damper, which combines the inerter devices with classical elastic springs, and demonstrates the effectiveness of these devices in achieving seismic response reduction. The inerto-elastic device employs the inerter and elastic spring in parallel to control the seismic structural response. The effectiveness of the inerto-elastic dampers has been demonstrated through the response of a multi-degree of freedom system subjected to seismic excitations. The results of the analysis show a significant reduction in the response of the structure with novel inerto-elastic damper, as compared to those of structures with normal elastic spring as well as no dampers. The response quantities of interest, considered for this study are top floor displacement, inter-storey drift and base shear. The study also underlines optimal parameters for the inerter fictive mass and the elastic spring stiffness on the basis of the results obtained.

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