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Adaptive Decoupling Control of the Quadruple-Tank System
Sajjad Pourmohammad,Alireza Yazdizadeh 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
Level control of a quadruple-tank process with severe coupling effect is investigated in this paper. The plant provides a nice benchmark problem that illustrates some of the challenges posed by complex interconnected systems to linear design paradigms. The system has some special features like nonlinear dynamics, multi-input multi-output nature, and an adjustable zero location that makes it ideal for illustrating many concepts in multivariable control systems. Most of the recently proposed control methods suffer from a nice decoupling control scheme. Among these control schemes, model predictive control is superior in coping with the coupling effect however it can only decouple the system if an accurate model of the system is used in the control design stage. In this paper an adaptive nonlinear feedback linearization scheme is proposed that can completely decouple and linearize the system in all working points even in the presence of a model-mismatch. A comparison between the proposed controller, conventional PID control and the constrained model predictive control scheme is also given by some simulation results.
Parametric study on earthquake induced pounding between adjacent buildings
Naserkhaki, Sadegh,Abdul Aziz, Farah N.A.,Pourmohammad, Hassan Techno-Press 2012 Structural Engineering and Mechanics, An Int'l Jou Vol.43 No.4
Pounding between closely located adjacent buildings is a serious issue of dense cities in the earthquake prone areas. Seismic responses of adjacent buildings subjected to earthquake induced pounding are numerically studied in this paper. The adjacent buildings are modeled as the lumped mass shear buildings subjected to earthquake acceleration and the pounding forces are modeled as the Kelvin contact force model. The Kelvin model is activated when the separation gap is closed and the buildings pound together. Characteristics of the Kelvin model are extensively explored and a new procedure is proposed to determine its stiffness. The developed model is solved numerically and a SDOF pounding case as well as a MDOF pounding case of multistory adjacent buildings are elaborated and discussed. Effects of different separation gaps, building heights and earthquake excitations on the seismic responses of adjacent buildings are obtained. Results show that the seismic responses of adjacent buildings are affected negatively by the pounding. More stories pound together and pounding is more intense if the separation gap is smaller. When the height of buildings differs significantly, the taller building is almost unaffected while the shorter building is affected detrimentally. Finally, the buildings should be analyzed case by case considering the potential earthquake excitation in the area.
Pounding between adjacent buildings of varying height coupled through soil
Naserkhaki, Sadegh,El-Rich, Marwan,Aziz, Farah N.A. Abdul,Pourmohammad, Hassan Techno-Press 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.52 No.3
Pounding between adjacent buildings is a significant challenge in metropolitan areas because buildings of different heights collide during earthquake excitations due to varying dynamic properties and narrow separation gaps. The seismic responses of adjacent buildings of varying height, coupled through soil subjected to earthquake-induced pounding, are evaluated in this paper. The lumped mass model is used to simulate the buildings and soil, while the linear visco-elastic contact force model is used to simulate pounding forces. The results indicate while the taller building is almost unaffected when the shorter building is very short, it suffers more from pounding with increasing height of the shorter building. The shorter building suffers more from the pounding with decreasing height and when its height differs substantially from that of the taller building. The minimum required separation gap to prevent pounding is increased with increasing height of the shorter building until the buildings become almost in-phase. Considering the soil effect; pounding forces are reduced, displacements and story shears are increased after pounding, and also, minimum separation gap required to prevent pounding is increased.
Parametric study on earthquake induced pounding between adjacent buildings
Sadegh Naserkhaki,Farah N.A. Abdul Aziz,Hassan Pourmohammad 국제구조공학회 2012 Structural Engineering and Mechanics, An Int'l Jou Vol.43 No.4
Pounding between closely located adjacent buildings is a serious issue of dense cities in the earthquake prone areas. Seismic responses of adjacent buildings subjected to earthquake induced pounding are numerically studied in this paper. The adjacent buildings are modeled as the lumped mass shear buildings subjected to earthquake acceleration and the pounding forces are modeled as the Kelvin contact force model. The Kelvin model is activated when the separation gap is closed and the buildings pound together. Characteristics of the Kelvin model are extensively explored and a new procedure is proposed to determine its stiffness. The developed model is solved numerically and a SDOF pounding case as well as a MDOF pounding case of multistory adjacent buildings are elaborated and discussed. Effects of different separation gaps, building heights and earthquake excitations on the seismic responses of adjacent buildings are obtained. Results show that the seismic responses of adjacent buildings are affected negatively by the pounding. More stories pound together and pounding is more intense if the separation gap is smaller. When the height of buildings differs significantly, the taller building is almost unaffected while the shorter building is affected detrimentally. Finally, the buildings should be analyzed case by case considering the potential earthquake excitation in the area.
Pounding between adjacent buildings of varying height coupled through soil
Sadegh Naserkhaki,Marwan El-Rich,Farah N.A. Abdul Aziz,Hassan Pourmohammad 국제구조공학회 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.52 No.3
Pounding between adjacent buildings is a significant challenge in metropolitan areas because buildings of different heights collide during earthquake excitations due to varying dynamic properties and narrow separation gaps. The seismic responses of adjacent buildings of varying height, coupled through soil subjected to earthquake-induced pounding, are evaluated in this paper. The lumped mass model is used to simulate the buildings and soil, while the linear visco-elastic contact force model is used to simulatepounding forces. The results indicate while the taller building is almost unaffected when the shorter building is very short, it suffers more from pounding with increasing height of the shorter building. The shorter building suffers more from the pounding with decreasing height and when its height differs substantially from that of the taller building. The minimum required separation gap to prevent pounding is increased with increasing height of the shorter building until the buildings become almost in-phase. Considering the soil effect; pounding forces are reduced, displacements and story shears are increased after pounding, and also, minimum separation gap required to prevent pounding is increased.