LQG Control of Across-Wind Response of a Tall Building

2013 ◽  
Vol 823 ◽  
pp. 396-401
Author(s):  
Young Moon Kim ◽  
Ki Pyo You ◽  
Jang Youl You
Keyword(s):  
Time Domain ◽  
Tall Buildings ◽  
Wind Load ◽  
Tall Building ◽  
Control Force ◽  
Optimum Control ◽  
Linear Quadratic ◽  
Lqg Control ◽  
Wind Response ◽  
The Time Domain

Modern tall buildings using high strength and lighter construction materials are more flexible so could be excessive wind-induced vibrations resulting in occupant discomfort and structural unsafety . Recently, many studies have been advanced in using actuator force as an active control force based on the linear quadratic optimum control theory. It needs to predict the wind-induced response and the optimum control force to reduce the excessive wind-induced vibration. It takes a lot of time and cost to do wind tunnel test needed it, so numerical simulation approach instead of that is recommended sometimes. Simulating wind load in the time domain using known spectra data of fluctuating wind load is particularly useful for some prediction of windinduced vibration which is more or less narrow banded process such as across-wind response of a tall building. The simulation procedure is taken from Deodatis. In this study, fluctuating across-wind load acting on a tall building was simulated numerically in the time domain using the across-wind load spectra proposed by A.Kareem in1982. And using this simulated across-wind load estimated the reduced across-wind vibration response of a tall building using the linear quadratic Gaussian (LQG) control method.

LQR Control of Along-Wind Response of a Tall Building

2013 ◽  
Vol 421 ◽  
pp. 767-771 ◽  
Author(s):  
Young Moon Kim ◽  
Ki Pyo You ◽  
Jang Youl You ◽  
Sun Young Paek ◽  
Byung Hee Nam
Keyword(s):  
Time Domain ◽  
Tall Buildings ◽  
Wind Load ◽  
Tall Building ◽  
Control Force ◽  
Optimum Control ◽  
Linear Quadratic ◽  
Lqr Control ◽  
Wind Response ◽  
The Time Domain

Modern tall buildings using high strength and lighter construction materials are more flexible so could be excessive wind-induced vibrations resulting in occupant discomfort and structural unsafety. Recently, many studies have been advanced in using actuator force as an active control force based on the linear quadratic optimum control theory .It needs to predict the wind-induced response and the optimum control force to reduce the excessive wind-induced vibration. It takes a lot of time and cost to do wind tunnel test needed it, so numerical simulation approach instead of that is recommended sometimes. Simulating wind load in the time domain using known spectra data of fluctuating wind load is particularly useful for some prediction of windinduced vibration which is more or less narrow banded process such as a along-wind response of a tall building. In this study, fluctuating along-wind load acting on a tall building treated as a stationary Gaussian white noise process was simulated numerically in the time domain using the along-wind load spectra proposed by G.Solari in1992. And using this simulated along-wind load estimated the reduced along-wind vibration response of a tall building which has an active tuned mass damper (ATMD) installed based on the linear quadratic regulator (LQR) control method.

scholarly journals LQG Control of Along-Wind Response of a Tall Building with an ATMD

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Ki-Pyo You ◽  
Jang-Youl You ◽  
Young-Moon Kim
Keyword(s):  
Damping Ratio ◽  
Tall Buildings ◽  
Tuned Mass Damper ◽  
Wind Load ◽  
Tall Building ◽  
Structural Safety ◽  
Design Parameters ◽  
Random Load ◽  
Mass Damper ◽  
Wind Response

Modern tall buildings use lighter construction materials that have high strength and less stiffness and are more flexible. Although this results in the improvement of structural safety, excessive wind-induced excitations could lead to occupant discomfort. The optimal control law of a linear quadratic Gaussian (LQG) controller with an active tuned mass damper (ATMD) is used for reducing the along-wind response of a tall building. ATMD consists of a second mass with optimum parameters for tuning frequency and damping ratio of the tuned mass damper (TMD), under the stationary random load, was used. A fluctuating along-wind load, acting on a tall building, was treated as a stationary Gaussian white noise and was simulated numerically, in the time domain, using the along-wind load spectra proposed by G. Solari in 1993. Using this simulated wind load, it was possible to calculate the along-wind responses of a tall building (with and without the ATMD), using an LQG controller. Comparing the RMS (root mean square) response revealed that the numerically simulated along-wind responses, without ATMD, are a good approximation to the closed form response, and that the reduced responses with ATMD and LQG controller were estimated by varying the values of control design parameters.

LQG Control of Across-Wind Response of a Tall Building with AMD

2014 ◽  
Vol 1004-1005 ◽  
pp. 1602-1607
Author(s):  
Young Moon Kim ◽  
Ki Pyo You ◽  
Jang Youl You
Keyword(s):  
Gaussian White Noise ◽  
Tall Buildings ◽  
Wind Load ◽  
Tall Building ◽  
Structural Safety ◽  
Linear Quadratic ◽  
Gaussian White Noise Process ◽  
Wind Vibration ◽  
Vibration Responses ◽  
Wind Induced Vibration

Modern tall buildings are more flexible so occur excessive wind-induced vibration resulting in occupant discomfort and structural safety. Many studies to reduce such a wind-induced vibration using a feedback controller and auxiliary devices have been conducted .The optimal control law of linear quadratic Gaussian (LQG) controller is used for reducing the across-wind vibration response of a tall building with an active mass damper (AMD). Fluctuating across-wind load treated as a Gaussian white noise process is simulated numerically in time domain. And using this simulated across-wind load estimated across-wind vibration responses of tall building with AMD using LQG controller.

LQG Control of Along-Wind Responses of Tall Building Using Composite Tuned Mass Dampers

2016 ◽  
Vol 723 ◽  
pp. 753-759
Author(s):  
Young Moon Kim ◽  
Ki Pyo You ◽  
Jang Youl You ◽  
Sun Young Paek ◽  
Byung Hee Nam
Keyword(s):  
Tuned Mass Damper ◽  
Wind Load ◽  
Tall Building ◽  
Control Force ◽  
Load Spectrum ◽  
Linear Quadratic ◽  
Tuned Mass Dampers ◽  
Optimum Parameters ◽  
Mass Damper ◽  
Wind Induced Vibration

A composite tuned mass damper(CTMD) is a vibration control device consisting of an active-passive tuned mass dampers supported on the primary vibrating structure. The performance of CTMD in mitigating wind-induced vibration of tall building is investigated. Optimum parameters of a passive tuned mass damper(PTMD)for minimizing the variance response of the damped primary structure under random loads, with different mass ratio of an active tuned mass damper(ATMD) to a PTMD have been used for the optimum parameters of CTMD. The active control force generated by ATMD actuator was estimated by using linear quadratic Gaussian(LQG) controller, and the fluctuating along-wind load, treated as a stationary random process ,was simulated numerically using the along-wind load spectrum proposed by Solari .Comparing the along-wind rms response of tall building without a CTMD, the CTMD is effective in reducing the response to 40%~45% of the response without the CTMD. Therefore, the CTMD system was effective in reducing wind-induced vibration of tall building.

Motion control of a cruise ship by using active stabilizing fins

2011 ◽  
Vol 225 (4) ◽  
pp. 311-324 ◽  
Author(s):  
J-H Kim ◽  
Y-H Kim
Keyword(s):  
Motion Control ◽  
Control Algorithm ◽  
Roll Motion ◽  
Cruise Ship ◽  
Linear Quadratic ◽  
Linear Quadratic Gaussian ◽  
Lqg Control ◽  
Induced Motion ◽  
The Time Domain ◽  
Wave Induced

The present study considers the motion control of a cruise ship by using active stabilizing fins. One or two pairs of stabilizing fins are equipped to reduce the roll and/or pitch motions of the cruise ship. Each fin is controlled by algorithms based on proportional–integral–derivative (PID) and linear quadratic Gaussian (LQG) control. Numerical analysis of the wave-induced motion of a cruise ship with stabilizing fins is carried out by using the time-domain ship motion program which has been developed through this study. The resultant motion response as the performance of each controller is compared between different control algorithms. Based on the present simulation results, the stabilizing fin can be considered a good instrument to reduce pitch motion as well as roll motion of the present cruise ship model. The present results show that the PID control algorithm, a simple but practical algorithm, can be an appropriate method to reduce the roll motion in a moderate sea state, while the LQG control algorithm shows good performance in reducing not only the roll motion but also the coupled roll and pitch motions simultaneously in all of environmental conditions considered.

Study on a Time Domain Prediction Method for Wave Force: Application for a Point-Absorber WEC

2018 ◽  
Author(s):  
Qiao Li ◽  
Motohiko Murai
Keyword(s):  
Time Domain ◽  
Wave Spectrum ◽  
Time Domain Analysis ◽  
Wave Force ◽  
Domain Analysis ◽  
Irregular Waves ◽  
Floating Body ◽  
Control Force ◽  
Electric Generator ◽  
The Time Domain

There are a lot of numerical analysis for solving hydrodynamic responses of a floating body in the time domain. Most of them can give a theoretical solution in given irregular waves. It means, however, that the solution can be obtained only if the accurate irregular waves represented by the wave spectrum should be given. As we consider the actual operation, we know it is difficult to detect the accurate irregular waves instantaneously as needed accuracy in the most of the time domain analysis for feed backing the control force to the system. This paper proposes a new method to predict the practical wave force from the displacement of waves at a floating body in time domain analysis almost instantaneously. The method, that can apply to predict forces in wave energy converter with linear electric generator, helps us to choose the control force for convert more electric power in irregular waves. We confirm the algorithm and examine its effectiveness.

Bracing Systems for Seismic and Wind Performance of Tall Buildings

2013 ◽  
Vol 650 ◽  
pp. 667-672 ◽  
Author(s):  
Dong Keon Kim ◽  
Jong Wan Hu
Keyword(s):  
Base Isolation ◽  
Tall Buildings ◽  
Wind Load ◽  
Tall Building ◽  
Structural Safety ◽  
Seismic Load ◽  
Isolation System ◽  
Seismic Codes ◽  
The World ◽  
Base Isolation System

Occurrence of frequency of earthquakes around the world has been increased including Sendai earthquake in Japan and magnitude of earthquake has also increased. Recently, many tall buildings using local seismic codes can be exposed to the risk of an earthquake and wind. Also, some buildings, which was planned to be built, were foundered as a result of lack of finance. Therefore, for tall buildings, structural safety such as earthquake and wind resistant performance, and financing issue are very important to progress the huge project. So we need to find another optimum alternative other than damping devices and base isolation system. In this study, four types of test specimens are used, which are fifty-story base tall building, tall building that was reinforced with diagonal brace, x-brace, and Chevron brace. And all of these cases, are subjected to the seismic load and wind load, finally analyzed and compared for seismic and wind performances.

ACTIVE MULTIPLE TUNED MASS DAMPERS FOR REDUCTION OF UNDESIRABLE OSCILLATIONS OF STRUCTURES UNDER WIND LOADS

2009 ◽  
Vol 09 (01) ◽  
pp. 127-149 ◽  
Author(s):  
CHUNXIANG LI ◽  
BINGKANG HAN ◽  
JINGYI ZHANG ◽  
YAN QU ◽  
JINHUA LI
Keyword(s):  
Time Domain ◽  
Natural Frequencies ◽  
Wind Loads ◽  
Control Force ◽  
Tuned Mass Dampers ◽  
Vibration Mitigation ◽  
Simulation Results ◽  
The Time Domain ◽  
Control Forces ◽  
Multiple Tuned Mass Dampers

Active multiple tuned mass dampers (AMTMDs) consisting of several active tuned mass dampers (ATMDs) with uniform distribution of natural frequencies have been proposed for vibration mitigation of structures under wind loads. In this regard, the optimum parameter criterion is defined as the minimization of the root-mean-square (RMS) displacement and acceleration responses of the structure with the AMTMD. Meanwhile, the effectiveness criterion is defined as the ratio of the minimum RMS displacement and RMS acceleration of the structure with the AMTMD to those without the devices, respectively referred to as the displacement and acceleration reduction factors (DRF and ARF). With these two criteria, the influences of the selective parameters on the effectiveness and robustness of the devices for vibration control under wind loads are studied. In addition, the stroke of the AMTMD is examined by quantitatively assessing the RMS displacement of each ATMD. Results indicate that in comparison with a single ATMD, the AMTMD can cause more reduction in the displacement and acceleration responses of the structure under wind loads. The stroke of the AMTMD is greater based on the ARF than the DRF criterion. In particular, the simulation results in the time domain confirm that by resorting to the AMTMD, a large control force can indeed be decentralized into many smaller control forces without losing the level of response reduction.

Acceleration/Drift Feedback Control of MRD Connected Buildings

2013 ◽  
Author(s):  
Naresh K. Chandiramani ◽  
Gokarna B. Motra
Keyword(s):  
Input Voltage ◽  
Magnetorheological Damper ◽  
Effective Control ◽  
Control Force ◽  
Linear Quadratic ◽  
Linear Quadratic Gaussian ◽  
Seismic Response Control ◽  
Lqg Control ◽  
Direct Feedback ◽  
Static Output

Seismic response control of buildings connected by a magnetorheological damper (MRD) is studied. The desired control force is obtained using Linear Quadratic Gaussian (LQG) control with feedback of estimated states, or Optimal Static Output Feedback (OSOF) control using direct feedback of outputs. The damper input voltage is predicted using a Recurrent Neural Network (RNN). Various sensor configurations and state weightings are considered to obtain effective control. Effective control is possible using few sensors (eg. a single accelerometer with LQG-RNN).

Study on the Dynamic Interaction between Steel Primary Structure and Cable Curtain Walls Secondary Structure under Wind Load

2012 ◽  
Vol 446-449 ◽  
pp. 3076-3079
Author(s):  
Dui Xian Gao ◽  
Yong Lei Fan ◽  
Xiao Ling Cui
Keyword(s):  
Secondary Structure ◽  
Support System ◽  
Time Domain ◽  
Primary Structure ◽  
Wind Load ◽  
Dynamic Interaction ◽  
Curtain Wall ◽  
Maintenance System ◽  
Load Analysis ◽  
The Time Domain

Cable curtain walls as a new maintenance system is being used more and more in modern structures, it is particularly important to research the interaction between the framework and support for cable truss structure. Select a layer of glass curtain wall with cable truss support system in this paper compared with a separate framework with Wind load analysis of the time domain to study the interaction

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