Performance Studies of Linear Quadratic AMD Controller for Civil Engineering

2013 ◽  
Vol 346 ◽  
pp. 95-100
Author(s):  
L. Guenfaf ◽  
S. Allaoua
Keyword(s):  
Dynamic Model ◽  
Performance Studies ◽  
Linear Quadratic Regulator ◽  
Ball Screw ◽  
Structural Vibration ◽  
Practical Implementation ◽  
Linear Quadratic ◽  
Active Mass ◽  
Structural Vibration Control ◽  
Screw Pitch

In this paper a Linear Quadratic Regulator (LQR) with and without actuator dynamic model for an electric-type active mass driver (AMD) system for structural vibration control has been developed. The electric-type active mass driver (AMD) system is composed primarily of an electric servomotor and a ball screw, the electrical AMD system is free from noise problems, oil leakage, and labor-intensive maintenance that commonly are associated with hydraulic AMD systems. The desired stroke amplification of the mass and the power demand of the servomotor can be adjusted via the ball screw pitch, which affects the effectiveness and efficiency of the system. The AMD system performances without and with introduction of the actuators dynamic model are explored. The reductions of the peak responses can reach as high as 65% if the actuator is properly chosen. And the proposed system is recommended for practical implementation.

Diagonal Recurrent Neural Networks for MDOF Structural Vibration Control

2008 ◽  
Vol 130 (6) ◽  
Author(s):  
Z. Q. Gu ◽  
S. O. Oyadiji
Keyword(s):  
Vibration Control ◽  
Control Method ◽  
Control Strategies ◽  
Linear Quadratic Regulator ◽  
Pole Placement ◽  
Structural Vibration ◽  
Stability And Convergence ◽  
Northridge Earthquake ◽  
Linear Quadratic ◽  
Structural Vibration Control

In recent years, considerable attention has been paid to the development of theories and applications associated with structural vibration control. Integrating the nonlinear mapping ability with the dynamic evolution capability, diagonal recurrent neural network (DRNN) meets the needs of the demanding control requirements in increasingly complex dynamic systems because of its simple and recurrent architecture. This paper presents numerical studies of multiple degree-of-freedom (MDOF) structural vibration control based on the approach of the backpropagation algorithm to the DRNN control method. The controller’s stability and convergence and comparisons of the DRNN method with conventional control strategies are also examined. The numerical simulations show that the structural vibration responses of linear and nonlinear MDOF structures are reduced by between 78% and 86%, and between 52% and 80%, respectively, when they are subjected to El Centro, Kobe, Hachinohe, and Northridge earthquake processes. The numerical simulation shows that the DRNN method outperforms conventional control strategies, which include linear quadratic regulator (LQR), linear quadratic Gaussian (LQG) (based on the acceleration feedback), and pole placement by between 20% and 30% in the case of linear MDOF structures. For nonlinear MDOF structures, in which the conventional controllers are ineffective, the DRNN controller is still effective. However, the level of reduction of the structural vibration response of nonlinear MDOF structures achievable is reduced by about 20% in comparison to the reductions achievable with linear MDOF structures.

Optimum Structural Vibration Control With Bounds on Control Forces

1995 ◽  
Author(s):  
Alexander A. Bolonkin ◽  
Duane E. Veley ◽  
Narendra S. Khot
Keyword(s):  
Control System ◽  
Linear Quadratic Regulator ◽  
Structural Vibration ◽  
Control Force ◽  
Linear Quadratic ◽  
Structural Vibration Control ◽  
Structure Control ◽  
Design Variables ◽  
Control Devices ◽  
Control Forces

Abstract This paper describes an approach for designing a structure-control system based on the linear quadratic regulator (LQR) which suppresses vibrations in structures. Bounds are placed on the control forces to simulate real actuators. The control system is optimized with an objective function of the total weight of the control devices. The design variables are the bounds (which are proportional to the weight of the control devices) on each control force with a constraint on the time to reduce the energy of the vibration to 5% of its initial value. As an example to illustrate the application of an approach, a wing box idealized by rod elements is used. Control systems are designed for this structure using four and eight actuators for several locations.

Experimental Investigation of Full-Order Observered and LQR Controlled Building-Like Structure Under Seismic Excitation

2013 ◽  
Vol 307 ◽  
pp. 316-320
Author(s):  
Mustafa Tinkir ◽  
Mete Kalyoncu ◽  
Yusuf Şahin
Keyword(s):  
Control Strategy ◽  
Dynamic Behaviour ◽  
Linear Quadratic Regulator ◽  
Seismic Excitation ◽  
Velocity Control ◽  
Passive Mode ◽  
Linear Quadratic ◽  
Active Mass ◽  
Active Mode ◽  
Two Degree Of Freedom

In this paper, the dynamic behaviour of two degree of freedom building-like structure system against unexpected input such as seismic excitation is considered by experimentally. Proposed system consists of two floors structure with active mass damping (AMD) and shaker. Passive and active mode deflection responses of the floors are investigated and also a cart is used to suppress vibrations, which moves linear direction and is mounted on the second floor. PV (proportional and velocity) control of the cart is realized in passive mode. Moreover LQR (Linear Quadratic Regulator) control is designed to control the cart in active mode while system under excitation. For this aim a full-order observer is designed and implemented to control strategy. Displacements of cart, deflections and accelerations results of the floors are presented separately for passive and active mode responses of the system in the form of graphics.

ACTIVE VIBRATION CONTROL OF SEISMICALLY EXCITED STRUCTURES BY ATMDS: STABILITY AND PERFORMANCE ROBUSTNESS PERSPECTIVE

2010 ◽  
Vol 10 (03) ◽  
pp. 501-527 ◽  
Author(s):  
ARASH MOHTAT ◽  
AGHIL YOUSEFI-KOMA ◽  
EHSAN DEHGHAN-NIRI
Keyword(s):  
Vibration Control ◽  
Structural Damage ◽  
Fuzzy Logic Controller ◽  
Control Strategies ◽  
Linear Quadratic Regulator ◽  
Pole Placement ◽  
Structural Vibration ◽  
Linear Quadratic ◽  
And Performance ◽  
Performance Robustness

This paper demonstrates the trade-off between nominal performance and robustness in intelligent and conventional structural vibration control schemes; and, proposes a systematic treatment of stability robustness and performance robustness against uncertainty due to structural damage. The adopted control strategies include an intelligent genetic fuzzy logic controller (GFLC) and reduced-order observer-based (ROOB) controllers based on pole-placement and linear quadratic regulator (LQR) conventional schemes. These control strategies are applied to a seismically excited truss bridge structure through an active tuned mass damper (ATMD). Response of the bridge-ATMD control system to earthquake excitation records under nominal and uncertain conditions is analyzed via simulation tests. Based on these results, advantages of exploiting heuristic intelligence in seismic vibration control, as well as some complexities arising in realistic conventional control are highlighted. It has been shown that the coupled effect of spill-over (due to reduction and observation) and mismatch between the mathematical model and the actual plant (due to uncertainty and modeling errors) can destabilize the conventional closed-loop system even if each is alone tolerated. Accordingly, the GFLC proves itself to be the dominant design in terms of the compromise between performance and robustness.

Levitation Control of AEROTRAIN: Development of Experimental Wing-in-Ground Effect Vehicle and Stabilization AlongZAxis and About Roll and Pitch Axes

2011 ◽  
Vol 23 (3) ◽  
pp. 338-349 ◽  
Author(s):  
Yusuke Sugahara ◽  
◽  
Yusuke Ikeuchi ◽  
Ryo Suzuki ◽  
Yasuhisa Hirata ◽  
...  
Keyword(s):  
Dynamic Model ◽  
High Efficiency ◽  
Linear Quadratic Regulator ◽  
Ground Effect ◽  
Linear Quadratic ◽  
Ground Vehicle ◽  
Control Effectiveness ◽  
Stabilization Control ◽  
And Control ◽  
Wing In Ground Effect

The goal of this study is to develop levitation stabilization control for an aerodynamically levitated highspeed, high-efficiency train, “Aero-Train.” Levitation occurs due to the wing-in-ground effect acting on a U-shaped guideway. To achieve our goal, we developed a small experimental prototype of the wing-in-ground vehicle, its dynamic model and control for stabilization along theZaxis and about the roll and pitch axes using a linear quadratic regulator, as described in this paper. Control effectiveness is confirmed by experimental results.

scholarly journals Investigation of the Structural Response of the MRE-Based MDOF Isolated Structure under Historic Near- and Far-Fault Earthquake Loadings

2021 ◽  
Vol 11 (6) ◽  
pp. 2876
Author(s):  
Muhammad Ahsan Tariq ◽  
Muhammad Usman ◽  
Syed Hassan Farooq ◽  
Imran Ullah ◽  
Asad Hanif
Keyword(s):  
Smart Materials ◽  
Base Isolation ◽  
Linear Quadratic Regulator ◽  
Optimal Feedback Control ◽  
Practical Implementation ◽  
Linear Quadratic ◽  
Isolation Layer ◽  
Near Fault ◽  
Fixed Base ◽  
Far Fault

Fixed base structures subjected to earthquake forces are prone to various issues, such as the attraction of greater forces to structure, amplified accelerations to non-structural components, expensive design for better seismic performance, and so forth. Base isolation applied at the foundation of vulnerable structures is a radical bypass from the conventional approaches utilized by structural engineers. However, the practical implementation of passive base isolation is constrained by factors such as large displacements at isolation level, uplifting forces at isolators, and vulnerability to unpredictable and versatile earthquakes. This study is focused on the evaluation of the smart base isolation system under various harmonic and earthquake loadings. The proposed system employs a magnetorheological elastomer (MRE)—a class of smart materials, based on an adaptive isolation layer under the building structure for its vibration control. The building is idealized as a five-degree-of-freedom (DOF) structure with the mass lumped at each storey. The stiffness of the MRE isolation layer is adjusted using the linear quadratic regulator (LQR) optimal feedback control algorithm. A total of 18 simulations have been performed for the fixed base, passively isolated, and MRE-based isolated structures under a series of earthquake loadings of both a near-fault and far-fault nature for analyzing a total of 306 responses of the structures. The simulation results indicate that MRE-based isolation has significantly reduced all the responses compared to the passively isolated structure for both the near-fault and far-fault earthquake loadings. For harmonic loading, however, the passively isolated structure outperformed the MRE isolated structure in terms of storey drift and acceleration responses.

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