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Dr. Serdar Ulusoy
Türkish-German University

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Research Keywords & Expertise

0 Optimization
0 Structural Engineering
0 Structural earthquake resistance
0 metaheuristic algorithm
0 active structural control

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Journal article
Published: 13 February 2021 in Applied Sciences
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In this study, multi-story structures with different combinations (on each floor and only the first floor) of active tendon control systems driven by a proportional–integral–derivative (PID) controller were actively controlled. The PID parameters, Kp (proportional gain), Td (derivative gain), and Ti (integral gain) for each structure, were optimally tuned by using both the harmony search algorithm (HS) and flower pollination algorithm (FPA), which are metaheuristic algorithms. In two different active-controlled structures, which are formed according to the position of the PID, the structural responses under near-fault records defined in FEMA P-695 are examined to determine the appropriate feedback which was applied for displacement, velocity, acceleration, and total acceleration. The performance of the different feedback strategies on these two active-controlled structures is evaluated. As a result, the acceleration feedback is suitable for all combinations of the active control system with a PID controller. The HS algorithm outperforms the optimum results found according to the FPA.

ACS Style

Serdar Ulusoy; Gebrail Bekdaş; Sinan Nigdeli; Sanghun Kim; Zong Geem. Performance of Optimum Tuned PID Controller with Different Feedback Strategies on Active-Controlled Structures. Applied Sciences 2021, 11, 1682 .

AMA Style

Serdar Ulusoy, Gebrail Bekdaş, Sinan Nigdeli, Sanghun Kim, Zong Geem. Performance of Optimum Tuned PID Controller with Different Feedback Strategies on Active-Controlled Structures. Applied Sciences. 2021; 11 (4):1682.

Chicago/Turabian Style

Serdar Ulusoy; Gebrail Bekdaş; Sinan Nigdeli; Sanghun Kim; Zong Geem. 2021. "Performance of Optimum Tuned PID Controller with Different Feedback Strategies on Active-Controlled Structures." Applied Sciences 11, no. 4: 1682.

Chapter
Published: 05 December 2020 in Developments in Advanced Control and Intelligent Automation for Complex Systems
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In this study, active controlled ten-story structures including soil-structure interaction (SSI) are investigated under different type of ground motions (near-fault and far ground motions) defined in FEMA P-695 to show the effect of earthquake records on SSI. In structures, where active tendons are located on each floor, the proportional-integral-derivative (PID) controllers are used. Optimum tuning of PID control parameters are calculated with the teaching-learning-based algorithm (TLBO) and harmony search algorithms (HSA) which are commonly used metaheuristic algorithms. The properties such as swaying and rocking stiffness and damping of dense and soft soils were added to the foundation of the structures to consider the soil-structure interaction. The changes of structural reactions in two types of earthquake records are examined by decreasing or increasing these properties of soils by 10 and 20%. As a result, reduction and enhancement of properties of soft soil in structural responses are changed significantly, while these values are not changed much for dense soil.

ACS Style

Serdar Ulusoy; Sinan Melih Nigdeli; Gebrail Bekdaş. The Effect of SSI and Impulsive Motions on Optimum Active Controlled MDOF Structure. Developments in Advanced Control and Intelligent Automation for Complex Systems 2020, 181 -198.

AMA Style

Serdar Ulusoy, Sinan Melih Nigdeli, Gebrail Bekdaş. The Effect of SSI and Impulsive Motions on Optimum Active Controlled MDOF Structure. Developments in Advanced Control and Intelligent Automation for Complex Systems. 2020; ():181-198.

Chicago/Turabian Style

Serdar Ulusoy; Sinan Melih Nigdeli; Gebrail Bekdaş. 2020. "The Effect of SSI and Impulsive Motions on Optimum Active Controlled MDOF Structure." Developments in Advanced Control and Intelligent Automation for Complex Systems , no. : 181-198.

Conference paper
Published: 17 November 2020 in Advances in Intelligent Systems and Computing
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In this study, the active controlled single degree of freedom (SDOF) structures with 0.5, 1.0 and 2.0 s period are investigated under various pulse-type ground motions (1.5, 2.0, and 2.5 s) to optimally tune the parameters of proportional–integral–derivative (PID)-type controllers. The damping ratio value is assumed as 5%. The paper proposes a methodology to determine the proportional gain (Kp), integral gain (Ti), and derivative gain (Td) using Harmony Search algorithm (HS) which is one of the metaheuristic-based methods. The performance index of active controlled structures is the displacement feedback. Also, the control force limit as 50% of the total mass of the structure and the time delay effect 20 ms were considered in term of feasibility and stability of active controlled structures. According to the results, the optimum tuned PID controller parameters has major effects on the structural responses of SDOF structures.

ACS Style

Serdar Ulusoy; Sinan Melih Nigdeli; Gebrail Bekdaş. Optimum Active Controlled SDOF Structures Under Pulse-Type Ground Motions via Harmony Search. Advances in Intelligent Systems and Computing 2020, 61 -72.

AMA Style

Serdar Ulusoy, Sinan Melih Nigdeli, Gebrail Bekdaş. Optimum Active Controlled SDOF Structures Under Pulse-Type Ground Motions via Harmony Search. Advances in Intelligent Systems and Computing. 2020; ():61-72.

Chicago/Turabian Style

Serdar Ulusoy; Sinan Melih Nigdeli; Gebrail Bekdaş. 2020. "Optimum Active Controlled SDOF Structures Under Pulse-Type Ground Motions via Harmony Search." Advances in Intelligent Systems and Computing , no. : 61-72.

Journal article
Published: 17 June 2020 in Challenge Journal of Concrete Research Letters
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The locations of structural members can be provided according to architectural projects in the design of reinforced concrete (RC) structures. The design of dimensions is the subject of civil engineering, and these designs are done according to the experience of the designer by considering the regulation suggestions, but these dimensions and the required reinforcement plan may not be optimum. For that reason, the dimensions and detailed reinforcement design of RC structures can be found by using optimization methods. To reach optimum results, metaheuristic algorithms can be used. In this study, several metaheuristic algorithms such as harmony search, bat algorithm and teaching learning-based optimization are used in the design of several RC beams for cost minimization. The optimum results are presented for different strength of concrete. The results show that using high strength material for high flexural moment capacity has lower cost than low stretch concrete since doubly reinforced design is not an optimum choice. The results prove that a definite metaheuristic algorithm cannot be proposed for the best optimum design of an engineering problem. According to the investigation of compressive strength of concrete, it can be said that a low strength material are optimum for low flexural moment, while a high strength material may be the optimum one by the increase of the flexural moment as expected.

ACS Style

Serdar Ulusoy; Aylin Ece Kayabekir; Gebrail Bekdaş; Sinan Melih Nigdeli. Metaheuristic algorithms in optimum design of reinforced concrete beam by investigating strength of concrete. Challenge Journal of Concrete Research Letters 2020, 11, 26 .

AMA Style

Serdar Ulusoy, Aylin Ece Kayabekir, Gebrail Bekdaş, Sinan Melih Nigdeli. Metaheuristic algorithms in optimum design of reinforced concrete beam by investigating strength of concrete. Challenge Journal of Concrete Research Letters. 2020; 11 (2):26.

Chicago/Turabian Style

Serdar Ulusoy; Aylin Ece Kayabekir; Gebrail Bekdaş; Sinan Melih Nigdeli. 2020. "Metaheuristic algorithms in optimum design of reinforced concrete beam by investigating strength of concrete." Challenge Journal of Concrete Research Letters 11, no. 2: 26.

Journal article
Published: 02 December 2019 in Challenge Journal of Structural Mechanics
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In active control of structures, the parameters of controllers used application must be perfectly tuned. In that case, a good vibration reduction performance can be obtained without a stability problem. During the tuning process, the limit of control force and time delay of controller system must be considered for applicable design. In the study, the optimum parameters of Proportional-Derivative-Integral (PID) type controllers that are proportional gain (K), integral time (Ti) and derivative time (Td) were optimized by using teaching learning-based optimization (TLBO). TLBO is a metaheuristic algorithm imitating the teaching and learning phases of education in classroom. The optimization was done according to the responses of the structure under a directivity pulse of near fault ground motions. In the study, time delay was considered as 20 ms and the optimum parameters of PID controller for a single degree of freedom (SDOF) structural model was found for different control force limits. The performances and feasibility of the method were evaluated by using sets of near fault earthquake records.

ACS Style

Serdar Ulusoy; Sinan Melih Niğdeli; Gebrail Bekdaş. Optimization of PID controller parameters for active control of single degree of freedom structures. Challenge Journal of Structural Mechanics 2019, 5, 130 .

AMA Style

Serdar Ulusoy, Sinan Melih Niğdeli, Gebrail Bekdaş. Optimization of PID controller parameters for active control of single degree of freedom structures. Challenge Journal of Structural Mechanics. 2019; 5 (4):130.

Chicago/Turabian Style

Serdar Ulusoy; Sinan Melih Niğdeli; Gebrail Bekdaş. 2019. "Optimization of PID controller parameters for active control of single degree of freedom structures." Challenge Journal of Structural Mechanics 5, no. 4: 130.