scholarly journals Semi-Active Vibration Control of a Non-Collocated Civil Structure Using Evolutionary-Based BELBIC

Actuators ◽  
2019 ◽  
Vol 8 (2) ◽  
pp. 43 ◽  
Author(s):  
Manuel Braz César ◽  
João Paulo Coelho ◽  
José Gonçalves
Keyword(s):  
Base Isolation ◽  
Active Vibration Control ◽  
Structural Behaviour ◽  
Tuned Mass Dampers ◽  
Earthquake Excitation ◽  
Vibration Sensors ◽  
Reduction Strategies ◽  
Active Vibration ◽  
Magneto Rheological ◽  
Storey Building

A buildings resilience to seismic activity can be increased by providing ways for the structure to dynamically counteract the effect of the Earth’s crust movements. This ability is fundamental in certain regions of the globe, where earthquakes are more frequent, and can be achieved using different strategies. State-of-the-art anti-seismic buildings have, embedded on their structure, mostly passive actuators such as base isolation, Tuned Mass Dampers (TMD) and viscous dampers that can be used to reduce the effect of seismic or even wind induced vibrations. The main disadvantage of this type of building vibration reduction strategies concerns their inability to adapt their properties in accordance to both the excitation signal or structural behaviour. This adaption capability can be promoted by adding to the building active type actuators operating under a closed-loop. However, these systems are substantially larger than passive type solutions and require a considerable amount of energy that may not be available during a severe earthquake due to power grid failure. An intermediate solution between these two extremes is the introduction of semi-active actuators such as magneto–rheological dampers. The inclusion of magneto–rheological actuators is among one of the most promising semi-active techniques. However, the overall performance of this strategy depends on several aspects such as the actuators number and location within the structure and the vibration sensors network. It can be the case where the installation leads to a non-collocated system which presents additional challenges to control. This paper proposes to tackle the problem of controlling the vibration of a non-collocated three-storey building by means of a brain–emotional controller tuned using an evolutionary algorithm. This controller will be used to adjust the stiffness coefficient of a magneto–rheological actuator such that the building’s frame oscillation under earthquake excitation, is mitigated. The obtained results suggest that, using this control strategy, it is possible to reduce the building vibration to secure levels.

Optimal Preview Control of Structural Vibrations Under Earthquake Excitations

2011 ◽  
Author(s):  
A. F. Shahrabi ◽  
G. Ahmadi
Keyword(s):  
System Performance ◽  
Base Isolation ◽  
Active Vibration Control ◽  
Preview Control ◽  
Earthquake Excitation ◽  
Building Model ◽  
Earthquake Records ◽  
Active Vibration ◽  
Improved Performance ◽  
Isolation Systems

Active vibration control of structures under earthquake excitation has attracted considerable attention in the recent years. In this study, attention was given to optimal preview control methodology for protection of building with and without base isolation systems against earthquakes. A three-story building model was used and several earthquake records including El Centro, Mexico City and Tabas earthquake records were used as excitation. Acceleration and displacement responses of the structure with active preview control were evaluated and the results are compared with those for the unprotected buildings. It was shown that using properly designed active preview control systems can effectively reduce the acceleration transmitted to structures during a major earthquake. The study was repeated for a base isolated structure. It was shown that that the using the information obtain from the preview sensors in the active control strategy would improve the system performance significantly. The influence of the preview time on the system performance was also studied. It was found that the range of preview time needed for improved performance is quite small but depends on the frequency contend of the earthquake excitation.

Verification of the Relation Between the Directions of Control Force and Responses in Active Seismic Isolation Device

2018 ◽  
Author(s):  
Keigo Nakamura ◽  
Nanako Miura ◽  
Akira Sone
Keyword(s):  
Active Control ◽  
Seismic Isolation ◽  
Seismic Waves ◽  
Base Isolation ◽  
Active Vibration Control ◽  
Control Force ◽  
Control Power ◽  
Active Vibration ◽  
Self Powered ◽  
Isolation Device

In this research, the focus is on the energy problem in active vibration control of a seismic isolation device using self-powered active control that regenerates electric power from kinetic energy of vibration system and uses it as control power. In recent years, it is proposed to install semi-active control or active control in an isolated structure to deal with seismic waves of various periods. However, since energy is required for control, there is a problem that the desired response reduction performance cannot be achieved when energy supply is interrupted at the time of a power outage. In our previous device, power is always given to the motor to control, thus power consumption is high. Therefore, the purpose of this research is to propose input method of control force that can reduce control power while keeping base isolation performance by classifying the role of the control force for each control phase and considering various combinations of input control force.

SEMI-ACTIVE VIBRATION CONTROL OF A ROTATING SHAFT BY USING A MAGNETO RHEOLOGICAL DAMPER

2015 ◽  
Author(s):  
Aldemir Ap Cavalini Jr ◽  
Edson Hideki Koroishi ◽  
Adriano Silva Borges ◽  
Luiz Gustavo Pereira ◽  
Valder Steffen Jr
Keyword(s):  
Vibration Control ◽  
Active Vibration Control ◽  
Rotating Shaft ◽  
Active Vibration ◽  
Magneto Rheological

An Experimental Study on Basic Characteristics of a Magneto-Rheological Grease Damper

2015 ◽  
Author(s):  
Yusuke Sato ◽  
Hiroshi Sodeyama ◽  
Makoto Hayama ◽  
Shin Morishita
Keyword(s):  
Vibration Control ◽  
Dispersion Medium ◽  
Fine Particles ◽  
Active Vibration Control ◽  
Test Results ◽  
Active Vibration ◽  
Derived Design ◽  
Basic Characteristics ◽  
Fluid Dampers ◽  
Magneto Rheological

As one of the semi-active vibration control devices for mechanical or civil structures, magneto-rheological fluid dampers have been enthusiastically studied and developed since the 1990s. A new magneto-rheological material for such dampers has been developed to provide a practical solution to the significant common drawback of sedimentation of ferromagnetic fine particles in the fluid. Industrial grease is used as the dispersion medium in this material. The thickener to be added in the grease to control the rheological properties seems to prevent separation of the particles from the dispersion medium. Several performance tests were carried out with a proto-type of the damper with the newly developed magneto-rheological grease, namely, the magneto-rheological grease damper. Based on the test results, the energy dissipation capabilities of the damper and the basic characteristics of the magneto-rheological grease were verified to provide semi-active vibration control. Moreover, the analytically-derived design formulae for the damper were improved on the basis of the test results.

scholarly journals Optimisation of a PID controller for a two-floor structure under earthquake excitation based on the bees algorithm

2018 ◽  
Vol 37 (1) ◽  
pp. 107-127 ◽  
Author(s):  
Muhammed Arif Şen ◽  
Mustafa Tinkir ◽  
Mete Kalyoncu
Keyword(s):  
Pid Controller ◽  
Structural Control ◽  
Active Vibration Control ◽  
Bees Algorithm ◽  
Graphical Form ◽  
Northridge Earthquake ◽  
Earthquake Excitation ◽  
Floor Structure ◽  
Active Vibration ◽  
Definition Of

The control of vibration and displacement in structures under seismic excitation is very challenging, and designing a structural control system against disturbances has drawn great attention. This paper concentrates on implementing the bees algorithm to tune gains of traditional PID controller for active vibration control of a building-like structure with two floors under Northridge Earthquake excitation. Bees algorithm is a diverse method to ensure an efficient solution for optimisation of a controller according to customary trial-error design methods. The main aim of this study is optimisation of KP, KI and KD gains with bees algorithm in order to obtain a more effective PID controller to suppress vibrations of the floors during the earthquake excitation. After definition of the system and bees algorithm, PID controller offline tuned with bees algorithm using mathematical model of system. Moreover, the aim is to compare the performances of the BA with an existing optimisation method, genetic algorithm (GA), implemented on the system. The paper presents the experimental results that were obtained from the structure system to show the efficiency of the tuned PID controller. As a result, the performance and effectiveness of the tuned PID controller are investigated and verified experimentally. The displacements and accelerations of the floors and the cart are decreased considerably. The experimental responses of the system are given in graphical form.

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