Books by Arcan Yanık
In the area of active control of structures, time delay
consideration is an important parameter w... more In the area of active control of structures, time delay
consideration is an important parameter which must be taken
into consideration for realistic numerical models. In this
research, the performance of a new active control algorithm for
several time delays under two different earthquake excitations
was investigated numerically. The proposed performance index
does not require a priori knowledge of seismic input and the
solution of the nonlinear matrix Riccati equation to apply the
control forces [1,2]. The proposed control introduces the
seismic energy term into the performance index so that the
mechanical energy of the structure, the control and the seismic
energies are considered simultaneously in the minimization
procedure, which yields cross terms in the performance index. A
two story shear frame was modelled in Matlab-Simulink
considering time-delay. A fully active tendon controller system
is implemented to the system. 0-50 ms time delay was
considered in the dynamic analysis. The change in the time
delay steps was 5 ms. The effect of time-delay was investigated
under synthetic and Erzincan NS (1995;95 Erzincan station)
earthquakes. Kanai-Tajimi power spectral density function was
used to generate synthetic earthquake motion. The behavior of
the proposed control with time delay considerations is
compared with the uncontrolled conventional structure.
Papers by Arcan Yanık
In this study a new simple approach for seismic vibration control of three dimensional structures... more In this study a new simple approach for seismic vibration control of three dimensional structures is proposed. This simple approach is based on modifying the stiffness and damping parameters of the structure. The additional stiffness and damping parameters are obtained by solving the Riccati equation in closed loop Classical Optimal Control (CLOC) and with the help of the optimal control gain matrix. Since it is not possible to add the exact optimal damping and stiffness parameters to the structure in practice some representative simple methods to obtain the suboptimal passive damping and stiffness parameters from the optimal control gain matrix are proposed [1]. Proposed method is applied to a 3-dimensional tier building structure. For this study, a 3-story steel building designed for the SAC project Los Angeles, California region is considered [2]. The structure is tested under two unidirectional real earthquake excitations. Two active control cases are considered for comparison. In the first case a single active tendon controller is implemented to each story in the north-south direction of the structure. In the second case active tendon controllers are implemented to the structure in both north-south and east-west directions. The results demonstrate that without applying active control forces to the structure, modifying the stiffness and damping parameters can supress the earthquake induced vibrations into the limits desired and the responses are similar to the actively controlled structures under CLOC.
In the area of active control of structures, time delay consideration is an important parameter w... more In the area of active control of structures, time delay consideration is an important parameter which must be taken into consideration for realistic numerical models. In this research, the performance of a new active control algorithm for several time delays under two different earthquake excitations was investigated numerically. The proposed performance index does not require a priori knowledge of seismic input and the solution of the nonlinear matrix Riccati equation to apply the control forces . The proposed control introduces the seismic energy term into the performance index so that the mechanical energy of the structure, the control and the seismic energies are considered simultaneously in the minimization procedure, which yields cross terms in the performance index. A two story shear frame was modelled in Matlab-Simulink considering time-delay. A fully active tendon controller system is implemented to the system. 0-50 ms time delay was considered in the dynamic analysis. The change in the time delay steps was 5 ms. The effect of time-delay was investigated under synthetic and Erzincan NS (1995;95 Erzincan station) earthquakes. Kanai-Tajimi power spectral density function was used to generate synthetic earthquake motion. The behavior of the proposed control with time delay considerations is compared with the uncontrolled conventional structure.
In recent years, increased performance requirements and the strong desire for better utilization ... more In recent years, increased performance requirements and the strong desire for better utilization of new materials and lower costs have motivated the development of new concepts for protecting structures. Recent practical applications and research findings show that the passive and active control techniques have the potential of protecting civil engineering structures from severe earthquakes and strong winds. In this paper, application potentials of passive and active control systems to earthquake excited structures are investigated in terms of energy distribution in the structure. Dynamic behavior of a three storey shear frame structure, incorporating passive and active control systems, subjected to El Centro, Erzincan and the simulated ground motions is investigated. The well-known Kanai-Tajimi power spectral density function is used to generate the simulated ground motion. Instantaneous optimal control algorithm which minimizes a performance index defined as a time dependent quadratic scalar functional instead of a quadratic integral functional and takes into account only the current state is used as an active control algorithm. A computer program which takes into account the nonlinear material property is developed for the dynamic analysis of the controlled and the uncontrolled structure. Nonlinear differential equation of the motion is solved by Wilson-θ numerical method. The numerical simulation results are presented in a comparative way for uncontrolled, passively controlled, actively controlled structures by graphical representations with hysteretic curves and the distributions of the damping energy, total kinetic energy, strain energy and seismic energy. An energy based evaluation of the example structure incorporating different combinations of passive and active systems is made.
Conference Presentations by Arcan Yanık
This study presents a new method to find the optimal control forces for active tuned mass damper.... more This study presents a new method to find the optimal control forces for active tuned mass damper. The method uses three algorithms: discrete wavelet transform (DWT), particle swarm optimization (PSO), and linear quadratic regulator (LQR). DWT is used to obtain the local energy distribution of the motivation over the frequency bands. PSO is used to determine the gain matrices through the online update of the weighting matrices used in the LQR controller while eliminating the trial and error. The method is tested on a 10-story structure subject to several historical pulse-like near-fault ground motions. The results indicate that the proposed method is more effective at reducing the displacement response of the structure in real time than conventional LQR controllers.
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Books by Arcan Yanık
consideration is an important parameter which must be taken
into consideration for realistic numerical models. In this
research, the performance of a new active control algorithm for
several time delays under two different earthquake excitations
was investigated numerically. The proposed performance index
does not require a priori knowledge of seismic input and the
solution of the nonlinear matrix Riccati equation to apply the
control forces [1,2]. The proposed control introduces the
seismic energy term into the performance index so that the
mechanical energy of the structure, the control and the seismic
energies are considered simultaneously in the minimization
procedure, which yields cross terms in the performance index. A
two story shear frame was modelled in Matlab-Simulink
considering time-delay. A fully active tendon controller system
is implemented to the system. 0-50 ms time delay was
considered in the dynamic analysis. The change in the time
delay steps was 5 ms. The effect of time-delay was investigated
under synthetic and Erzincan NS (1995;95 Erzincan station)
earthquakes. Kanai-Tajimi power spectral density function was
used to generate synthetic earthquake motion. The behavior of
the proposed control with time delay considerations is
compared with the uncontrolled conventional structure.
Papers by Arcan Yanık
Conference Presentations by Arcan Yanık
consideration is an important parameter which must be taken
into consideration for realistic numerical models. In this
research, the performance of a new active control algorithm for
several time delays under two different earthquake excitations
was investigated numerically. The proposed performance index
does not require a priori knowledge of seismic input and the
solution of the nonlinear matrix Riccati equation to apply the
control forces [1,2]. The proposed control introduces the
seismic energy term into the performance index so that the
mechanical energy of the structure, the control and the seismic
energies are considered simultaneously in the minimization
procedure, which yields cross terms in the performance index. A
two story shear frame was modelled in Matlab-Simulink
considering time-delay. A fully active tendon controller system
is implemented to the system. 0-50 ms time delay was
considered in the dynamic analysis. The change in the time
delay steps was 5 ms. The effect of time-delay was investigated
under synthetic and Erzincan NS (1995;95 Erzincan station)
earthquakes. Kanai-Tajimi power spectral density function was
used to generate synthetic earthquake motion. The behavior of
the proposed control with time delay considerations is
compared with the uncontrolled conventional structure.