Response mitigation of the base isolated benchmark building by semi-active control with the viscous-plus-variable-friction damping force algorithm

2006 ◽  
Vol 13 (2-3) ◽  
pp. 809-822 ◽  
Author(s):  
Anat Ruangrassamee ◽  
Weerasit Srisamai ◽  
Panitan Lukkunaprasit
Keyword(s):  
Active Control ◽  
Friction Damping ◽  
Damping Force ◽  
Variable Friction

Seismic Control Effect for Nonlinear Benchmark Building Using Passive or Semi-Active Damper

2002 ◽  
Author(s):  
Akira Fukukita ◽  
Tomoo Saito ◽  
Keiji Shiba
Keyword(s):  
Active Control ◽  
Passive Control ◽  
Feedforward Control ◽  
Electrical Power ◽  
Control Device ◽  
Control Effect ◽  
Damping Force ◽  
Active Device ◽  
Seismic Control ◽  
Control Forces

We study the control effect for a 20-story benchmark building and apply passive or semi-active control devices to the building. First, the viscous damping wall is selected as a passive control device which consists of two outer plates and one inner plate, facing each other with a small gap filled with viscous fluid. The damping force depends on the interstory velocity, temperature and the shearing area. Next, the variable oil damper is selected as a semi-active control device which can produce the control forces by little electrical power. We propose a damper model in which the damping coefficient changes according to both the response of the damper and control forces based on an LQG feedback and feedforward control theory. It is demonstrated from the results of a series of simulations that the both passive device and semi-active device can effectively reduce the response of the structure in various earthquake motions.

scholarly journals MR Damper-Based Vibration Suppression Method for Control Moment Gyroscope

2018 ◽  
Vol 36 (5) ◽  
pp. 884-889
Author(s):  
Wendong Wang ◽  
Xing Ming ◽  
Yang Chu ◽  
Minghui Liu ◽  
Yikai Shi
Keyword(s):  
Active Control ◽  
Control Algorithm ◽  
Vibration Suppression ◽  
Control Method ◽  
Magnetorheological Damper ◽  
Magnetic Flux Density ◽  
Damping Force ◽  
Control Moment Gyroscope ◽  
Control Moment ◽  
Suppression Method

To restrain the interference of micro-vibration caused by Control Moment Gyroscope, a new control method based on Magnetorheological damper was proposed in this paper. A mechanical model based on the structure of the presented design was built, and the semi-active control algorithm of damping force was proposed for the designed Magnetorheological damper. The magnetic flux density and other magnetic field parameters were considered and analyzed in Maxwell, and also the related hardware circuit which implements the control algorithm was prepared to test the presented design and algorithm. The results of simulation and experiments show that the presented Magnetorheological damper model and semi-active control algorithm can complete the requirements, and the vibration suppression method is efficient for Control Moment Gyroscope.

Semi-Active Control of Civil Structures With a One-Step-Ahead Prediction of the Seismic Response

2009 ◽  
Author(s):  
Kazuhiko Hiramoto ◽  
Taichi Matsuoka ◽  
Katsuaki Sunakoda ◽  
Akira Fukukita ◽  
Issei Yamazaki
Keyword(s):  
Seismic Response ◽  
Active Control ◽  
Passive Control ◽  
Inertial Force ◽  
Damping Coefficient ◽  
Superior Performance ◽  
Damping Force ◽  
Civil Structures ◽  
One Step ◽  
Command Signal

We propose a semi-active control of civil structures based on a one-step-ahead prediction of the seismic response. The vibration control device (VCD), which has been developed by authors, generates two types of resistance forces, i.e., a damping force proportional to the relative velocity and an inertial force proportional to the relative acceleration between two stories. The damping coefficient of the VCD can be changed with a command signal to an electric circuit connected to the VCD. In the present paper the command signal for changing the damping coefficient of each VCD is assumed to take two values, i.e., the command to take the maximum or minimum damping coefficient. The optimal command signal is selected from all candidates of command signals so that the Euclidean norm of the one-step-ahead predicted seismic response is minimized. As an example a semi-active control of a fifteen-story building with three VCDs is considered. The simulation results show that the proposed semi-active control achieves superior performance on vibration suppression compared with a passive control case where the damping coefficient of each VCD is fixed at its maximum value.

Energy Regenerative and Active Control Suspension

2003 ◽  
Author(s):  
Yohji Okada ◽  
Sang-Soo Kim ◽  
Keisuke Ozawa
Keyword(s):  
Active Control ◽  
Dead Zone ◽  
Simple Experiment ◽  
Damping Force ◽  
Fundamental Idea ◽  
Nonlinear Characteristics ◽  
Low Speed ◽  
Variable Resistance ◽  
Damping Characteristics ◽  
Ac Motor

This paper introduces a variable resistance type energy regenerative suspension using PWM step-up chopper. The energy regenerative suspension has nonlinear characteristics with dead zone for low speed motion. Hence the energy is not regenerated nor has it damping force. In order to overcome this problem, a step-up chopper is introduced between the actuator and the charging circuit. This chopper is controlled by velocity-dependent PWM signal to improve the damping characteristics and the efficiency of the regenerative suspension. The suspension system changes its height according to the carrier load. Hence linear AC motor is used to the isolation actuator. A simple experiment was performed and the results showed better performance than the standard regenerative suspension. The system is planned to be modified incorporating active control. The fundamental idea and the configuration are introduced.

Application of a New Semi-Active Control Strategy to Dynamic Response Control of an Offshore Platform Using MR Dampers

2010 ◽  
Author(s):  
Xiaochuan Yu ◽  
Tianwei Ma ◽  
Jeffrey M. Falzarano
Keyword(s):  
Dynamic Response ◽  
Active Control ◽  
Control Strategy ◽  
Offshore Platform ◽  
Damping Force ◽  
Inverse Dynamic ◽  
Response Control ◽  
Mr Dampers ◽  
New Strategy ◽  
Active Control Strategy

A new semi-active control strategy is developed to adjust the voltage/current of magnetorheological (MR) dampers to track the optimal/desired damping force by the Linear Quadratic Regulator (LQR) method. Integrated with the new strategy, a modified inverse dynamic model is proposed to evaluate the value of evolutionary variable based on the Bouc-Wen model of MR dampers. This new strategy is firstly applied to a one-story building under El-Centro earthquake, and it is further applied to the dynamic response control of a fixed jacket offshore platform. The results show that this new semi-active control strategy can achieve efficient vibration control.

Feasibility Study on Active Control of Hydraulic Electromagnetic Energy-Regenerative Absorber

2010 ◽  
Vol 139-141 ◽  
pp. 2631-2635 ◽  
Author(s):  
Lin Xu ◽  
Xue Xun Guo ◽  
Jun Yan
Keyword(s):  
Active Control ◽  
Shock Absorber ◽  
Hydraulic Structure ◽  
Electrical Energy ◽  
Vibration Energy ◽  
Working Process ◽  
Damping Force ◽  
Compression Stroke ◽  
New Type ◽  
Test Result

This paper proposes a design of a new shock absorber with combined mechanical- electromagnetic- hydraulic structure, and expounds its working principles. This new type of absorber can recyle the vibration energy and transform it into electrical energy for use. However, in its working process, the damping force in extension stroke is always smaller than that in compression stroke, which is determined by the inner structure, while in traditional absorbers, it is just the opposite. This does not meet the practical demands. Directing at this problem, the paper puts out a way to make real-time adjustment to the damping force by controlling the generator load, and tests the feasibility with a simulation model built with AMESim. The test result reveals that the method is feasible. This contributes a lot to the future further research on active control.

Finite Element Modeling and Analysis of Friction Wedge Damping During Suspension Bounce Modes

2009 ◽  
Vol 131 (5) ◽  
Author(s):  
Y. Q. Sun ◽  
C. Cole
Keyword(s):  
Finite Element ◽  
Static Problem ◽  
Element Model ◽  
Fe Model ◽  
Friction Damping ◽  
Damping Force ◽  
Friction Forces ◽  
Modeling And Analysis ◽  
Damping Characteristics ◽  
Dimensional Finite Element

A two-dimensional finite element model (2D FEM) has been developed to improve the modeling and understanding of the friction damping characteristics of freight bogie suspensions. The specific suspension considered utilizes friction dampers with constant preload force as are widely used in three-piece bogie wagons in Australia. Unlike simpler models commonly used in rail vehicle dynamics, the FE model developed can accommodate distributed normal forces across the wedge surfaces. The model was tested in bounce modes and compared with the normal equations used to model wedge friction forces, which treat the forces on the wedge as a static problem. The simulation results using the 2D FEM model showed that the friction damping force is not constant and changes when the suspension is in motion. It was also shown that the force changes magnitude during the loading and unloading situations. The factors, which affect the change in friction force, are the friction characteristics on wedge contact surfaces, the direction and change in tangent force on wedge angular surface, the elastic deformation of the wedge, the wedge relative movement, and the wedge structure arrangement. The FE model assumptions are investigated and insights on wedge friction and creepage discussed.

scholarly journals SEMI-ACTIVE PREDICTIVE CONTROL OF STRUCTURES WITH CONTROLLED STIFFNESS DEVICES AND VARIABLE FRICTION DAMPER SYSTEM

2010 ◽  
Vol 13 (4) ◽  
pp. 64-73
Author(s):  
Thang Quoc Chu ◽  
Hoa Nhan Pham ◽  
Ben Van Tran
Keyword(s):  
Active Control ◽  
Predictive Control ◽  
Control Algorithms ◽  
Friction Damper ◽  
Velocity Feedback ◽  
Numerical Examples ◽  
Acceleration Feedback ◽  
Variable Friction ◽  
Instantaneous Control

This paper presents two active control algorithms (Instantaneous Control with Displacement and Velocity Feedback (ICDVF) and Instantaneous Control with Velocity and Acceleration Feedback (ICAVF)) to control the structures eqquiped Controlled Stiffness Devices and Variable Friction Damper System. The numerical examples aim to evaluate the effect structure’s response reductions between the two algorithms as well as the principal and accessory role.

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