Semi-active control of curved bridge using piezoelectric friction dampers under multi-component multi-support earthquake

2007 ◽  
Author(s):  
Wei Quan ◽  
Hongnan Li
Keyword(s):  
Active Control ◽  
Friction Dampers ◽  
Curved Bridge

scholarly journals Reduction of Structural Vibrations by Passive and Semiactively Controlled Friction Dampers

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
L. Gaul ◽  
J. Becker
Keyword(s):  
Finite Element ◽  
Active Control ◽  
Constitutive Laws ◽  
Structural Vibration ◽  
Semiactive Control ◽  
Friction Damper ◽  
Structural Vibrations ◽  
Normal Contact ◽  
Friction Dampers ◽  
Major Interest

Reduction of structural vibrations is of major interest in mechanical engineering for lowering sound emission of vibrating structures, improving accuracy of machines, and increasing structure durability. Besides optimization of the mechanical design or various types of passive damping treatments, active structural vibration control concepts are efficient means to reduce unwanted vibrations. In this contribution, two different semiactive control concepts for vibration reduction are proposed that adapt to the normal force of attached friction dampers. Thereby, semiactive control concepts generally possess the advantage over active control in that the closed loop is intrinsically stable and that less energy is required for the actuation than in active control. In the chosen experimental implementation, a piezoelectric stack actuator is used to apply adjustable normal forces between a structure and an attached friction damper. Simulation and experimental results of a benchmark structure with passive and semiactively controlled friction dampers are compared for stationary narrowband excitation. For simulations of the control performance, transient simulations must be employed to predict the achieved vibration damping. It is well known that transient simulation of systems with friction and normal contact requires excessive computational power due to the nonlinear constitutive laws and the high contact stiffnesses involved. However, commercial finite-element codes do not allow simulating feedback control in a general way. As a remedy, a special simulation framework is developed which allows efficiently modeling interfaces with friction and normal contact by appropriate constitutive laws which are implemented by contact elements in a finite-element model. Furthermore, special model reduction techniques using a substructuring approach are employed for faster simulation.

SEMI-ACTIVE CONTROL OF FRICTION DAMPERS

1997 ◽  
Vol 202 (2) ◽  
pp. 203-218 ◽  
Author(s):  
P. Dupont ◽  
P. Kasturi ◽  
A. Stokes
Keyword(s):  
Active Control ◽  
Friction Dampers ◽  
Active Control Of Friction

Vibration Reduction by Passive and Semi-Active Friction Joints

2011 ◽  
Author(s):  
Lothar Gaul ◽  
Jens Becker
Keyword(s):  
Active Control ◽  
Mechanical Design ◽  
Vibration Reduction ◽  
Structural Vibration ◽  
Friction Damper ◽  
Friction Dampers ◽  
Structural Vibration Control ◽  
Experimental Implementation ◽  
Major Interest ◽  
Improving Accuracy

Reduction of structural vibrations is of major interest in mechanical engineering for lowering sound emission of vibrating structures, improving accuracy of machines and increasing structure durability. Besides optimization of the mechanical design or various types of passive damping treatments, active structural vibration control concepts are efficient means to reduce unwanted vibrations. In this contribution, two different semi-active control concepts for vibration reduction are proposed that adapt the normal force of attached friction dampers. Thereby, semi-active control concepts generally possess the advantage over active control that the closed loop is intrinsically stable and that less energy is required for the actuation than in active control. In the chosen experimental implementation, a piezoelectric stack actuators is used to apply adjustable normal forces between a structure and an attached friction damper. Simulation and experimental results of a benchmark structure with passive and semi-actively controlled friction dampers are compared for stationary narrow-band excitation.

Semiactive Wind Response Control of 76-Story Benchmark Building with Smart Piezoelectric Friction Dampers

2011 ◽  
Vol 250-253 ◽  
pp. 2196-2201 ◽  
Author(s):  
Ping Dong ◽  
Jian Fan
Keyword(s):  
Control System ◽  
Active Control ◽  
Simulation Analysis ◽  
Force Model ◽  
Friction Damper ◽  
Damping Force ◽  
Friction Dampers ◽  
Benchmark Model ◽  
Active Control System ◽  
Wind Induced Vibration

A smart piezoelectric friction damper (SPFD) is presented based on improved Pall friction dampers and its damping force model is analyzed. The wind-induced vibration control of Benchmark model using semi-active control strategies based on the classical LQR is studied. The results of simulation analysis show that the semi-active control effects of the standard wind-control model with SPFD is evident. Compared to uncontrolled structures, the wind-induced vibration responses of the controlled structures are effectively reduced. In addition, parameter optimization of the semi-active control system based on the limit Hrovat optimal control algorithm is carried out. The analysis shows that the robustness of the semi-active control system to the stiffness uncertainty of Benchmark Model is very good, but the robustness to the damping uncertainty is not so good.

Control Concepts of Semi-Active Friction Dampers

2009 ◽  
Author(s):  
Lothar Gaul ◽  
Jens Becker
Keyword(s):  
Active Control ◽  
Relative Displacement ◽  
Structural Vibration ◽  
Control Algorithms ◽  
Friction Damper ◽  
Control Laws ◽  
Friction Dampers ◽  
Closed Loop Systems ◽  
Major Interest ◽  
Improving Accuracy

Reduction of structural vibrations is of major interest in mechanical engineering for lowering sound emission of vibrating structures, improving accuracy of machines and increasing structure durability. Besides design optimization and passive damping treatments, active structural vibration control can be applied to reduce unwanted vibrations. In this contribution, two semi-active control laws for control of friction dampers are derived and investigated in simulations and experiments. Thereby, semi-active control concepts have the advantage over active control to yield intrinsically stable closed-loop systems and low energy consumption. In the experimental implementation, the control makes use of piezoelectric stack actuators to apply adjustable normal forces between structure and attached friction dampers. The control uses an observer based on reduced finite-element models to estimate the unknown relative displacement beneath the normal force actuator from acceleration measurements. Experimental results of the control algorithms for a structure with attached friction damper show the effectiveness of the proposed control algorithms.

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