scholarly journals Vibration Control Of Steel Frames Using Magnetorheological Dampers: A New Control Algorithm.

2019 ◽  
Vol 1 (1) ◽  
pp. 62-66
Author(s):  
Arunvivek G.K. ◽  
Saravanakumar R
Keyword(s):  
Vibration Control ◽  
Base Isolation ◽  
Structural Characteristics ◽  
Steel Frame ◽  
Design Strategies ◽  
Damping Force ◽  
Isolation System ◽  
Frame Model ◽  
Force Transducers ◽  
Structural Applications

Control technologies application to steel structure is mainly anticipated to enhance the structural performance against natural hazards. In particular smart base isolation system connected with semi-active isolator at the base with controllable semi devices gaining impulse for its efficiency and economic reasons. Generally the development of control design strategies through system dynamics concept had not been considered entirely for structural applications. Structural characteristics which help to divulge structural properties, hitherto flout by civil engineering circle are assimilated with control techniques to construct indices in modal and nodal coordinates for the endurance of the control action to utilize their fullest capabilities. In this study, an isolated 3D steel frame model is developed.  Magneto-Rheological dampers are fixed with 3D steel frame model which act as a smart control device. Besides, Force transducers and Piezoresistive Actuator in tandem with Deltatron conditioning amplifier are also used. Presently many techniques are employed for the optimum placement of actuators and sensors in vibration control systems. The concept of controllability-observability is used in these methods. The specific relationship between the vibration modes and controllability-observability simplifies this approach. This study envisaged the compatibility of force transducers along with triaxial and uniaxial accelerometers fixed at various trial spots on the model structure to quantify the damping force and absolute accelerations of the structure and the dampers individually, positioned in the system, against the excitation of the structure.

530 Application of Active Base Isolation System Using Absolute Vibration Control Technology

2011 ◽  
Vol 2011 (0) ◽  
pp. _530-1_-_530-10_
Author(s):  
Osamu YOSHIDA ◽  
Mitsuru KAGEYAMA ◽  
Takeshi SANO ◽  
Hideo KATSUMATA ◽  
Fumiaki ENDO ◽  
...  
Keyword(s):  
Vibration Control ◽  
Base Isolation ◽  
Control Technology ◽  
Isolation System ◽  
Base Isolation System ◽  
Active Base

scholarly journals Application of Active Base Isolation System Using Absolute Vibration Control Technology

2012 ◽  
Vol 78 (789) ◽  
pp. 1632-1643 ◽  
Author(s):  
Osamu YOSHIDA ◽  
Mitsuru KAGEYAMA ◽  
Takeshi SANO ◽  
Hideo KATSUMATA ◽  
Fumiaki ENDO ◽  
...  
Keyword(s):  
Vibration Control ◽  
Base Isolation ◽  
Control Technology ◽  
Isolation System ◽  
Base Isolation System ◽  
Active Base

A novel composite vibration control method using double-decked floating raft isolation system and particle damper

2017 ◽  
Vol 24 (19) ◽  
pp. 4407-4418 ◽  
Author(s):  
Xiaofei Lei ◽  
Chengjun Wu ◽  
Hengliang Wu
Keyword(s):  
Vibration Control ◽  
Control Method ◽  
Structural Characteristics ◽  
Resonance Method ◽  
Simulation Technique ◽  
Impedance Method ◽  
Isolation System ◽  
Floating Raft ◽  
Particle Damping ◽  
Particle Dampers

This paper presents a composite vibration control method that uses a double-decked floating raft isolation system and particle dampers to control the severe vibration of a heavy compressor set. In view of the structural characteristics of the compressor set, a mechanical impedance method is employed to investigate the acceleration transfer ratios of the double-decked floating raft isolation system, and to design three isolating schemes. Numerical results indicate that the particle damping technology does not disturb the isolating performance of the double-decked floating raft isolation system while reducing only its acceleration amplitude. To improve the damping performance of particle dampers, an anti-resonance method and a co-simulation technique are used to optimize the installation location of the particle dampers, as the damping effect is related to the vibrating velocity at the damper’s position. Furthermore, two types of particle damper—cylindrical and cuboid—are designed, based on conclusions drawn from experiments using the anti-resonance method. The damping effectiveness of the particle damper scheme is also examined using the co-simulation technique; results indicate that the proposed installation scheme can effectively suppress the vibration of the compressor rack. In addition, the presented schemes using the composite vibration control method are verified and compared in on-site experiments, and results demonstrate that the third isolating scheme presented, combined with particle damping technology, is best in controlling vibration of the compressor set.

scholarly journals Seismic Behavior of Superelastic Shape Memory Alloy Spring in Base Isolation System of Multi-Story Steel Frame

Materials ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 997 ◽  
Author(s):  
Yuping Liu ◽  
Hongyang Wang ◽  
Canxing Qiu ◽  
Xingnan Zhao
Keyword(s):  
Finite Element ◽  
Shape Memory ◽  
Earthquake Engineering ◽  
Seismic Behavior ◽  
Base Isolation ◽  
Residual Deformation ◽  
Steel Frame ◽  
Isolation System ◽  
Base Isolation System ◽  
Sma Spring

Owing to excellent re-centering capability and good damping behavior, superelastic shape memory alloys (SMAs) are emerging as a potential new material to enhance the seismic resilience of civil structures. This paper focuses on using base isolation with SMA device for isolated structures. SMA springs are deemed to be promising candidate as the damper in the base isolation system, due to the compact form, damping contribution, restoring capability and flexible stiffness. This paper reported the concept of an innovative spring which is made of superelastic SMA wire. Then cyclic loading tests were carried out to evaluate the interested cyclic properties. Parametric analyses based on finite element simulations were conducted to reveal the versatile performance of SMA springs. To further examine its seismic behavior in the base isolation system, the SMA spring was later installed at the isolation level of a multi-story steel frame, based on the finite element model built in the earthquake engineering simulation platform OpenSees. An ordinary elastic spring is included for comparison to highlight the features of SMA springs. Both isolated frames were subjected to real earthquakes. The comparisons indicated that using SMA spring is more effective in controlling maximum and residual deformation for the protected superstructures. Thus, this paper well demonstrated the feasibility and merits of using SMA springs in the isolated frames.

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