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21st IFAC World Congress on Automatic control - Meeting Societal Challenges

作者： Villoslada, D. Santos, M. Tomas-Rodriguez, M. Univ Complutense Madrid C Prof G Santesmases 9 Madrid 28040 Spain City Univ London London England

Floating offshore wind turbines (FOWT) stand as a promising concept to expand the wind energy generation into the more productive deep-water areas, where conventional bottom-fixed turbines are infeasible. Barge-type floating wind turbines experience an inverted pendulum effect which produces a coupling with the wind turbine response, resulting in large structural loads. In this paper, the authors investigate passive structural control to mitigate the tower fatigue, in the form of a tuned mass damper (TMD) installed in the nacelle. The study focuses on evaluating the benefits of adding a parallel-connected inerter device to the TMD. Based on a reduced dynamics model for the barge-type offshore wind turbine identified using the FAST-SC synthetic reference data, an optimization of the TMD and the inerter parameters is carried out. To that end, genetic algorithms were used taking the tower fatigue as a fitness function, derived from the tower top displacement. The results confirm that the inerter has limitations when installed in a traditional TMD, but show significant benefits when the TMD stroke is constrained by stops. It is found that the improved performance including the inerter is dependent on the stroke limitation with respect to the ideal TMD stroke without stops. Therefore, the use of the inerter is especially useful to enhance performances for both mass and stroke constrained applications. The load reduction for the selected baseline model improved up to 6 % over the TMD with stops and 12 % over the TMD without stops. Copyright (C) 2020 The Authors.

关键词： Barge Offshore Wind Turbine passive structural control Tuned Mass Damper Inerter Genetic Algorithm Optimization Fatigue

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Inerter-based passive structural control for Barge Floating Offshore Wind Turbines

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IFAC-PapersOnLine 2020年第2期53卷 12358-12363页

作者： D. Villoslada M. Santos M. Tomas-Rodriguez University Complutense of Madrid C/ Profesor G. Santesmases 9 28040 Madrid Spain City University of London London UK

Floating offshore wind turbines (FOWT) stand as a promising concept to expand the wind energy generation into the more productive deep-water areas, where conventional bottom-fixed turbines are infeasible. Barge-type floating wind turbines experience an inverted pendulum effect which produces a coupling with the wind turbine response, resulting in large structural loads. In this paper, the authors investigate passive structural control to mitigate the tower fatigue, in the form of a tuned mass damper (TMD) installed in the nacelle. The study focuses on evaluating the benefits of adding a parallel-connected inerter device to the TMD. Based on a reduced dynamics model for the barge-type offshore wind turbine identified using the FAST-SC synthetic reference data, an optimization of the TMD and the inerter parameters is carried out. To that end, genetic algorithms were used taking the tower fatigue as a fitness function, derived from the tower top displacement. The results confirm that the inerter has limitations when installed in a traditional TMD, but show signifcant benefits when the TMD stroke is constrained by stops. It is found that the improved performance including the inerter is dependent on the stroke limitation with respect to the ideal TMD stroke without stops. Therefore, the use of the inerter is especially useful to enhance performances for both mass and stroke constrained applications. The load reduction for the selected baseline model improved up to 6 % over the TMD with stops and 12 % over the TMD without stops.

关键词： Barge Offshore Wind Turbine passive structural control Tuned Mass Damper Inerter Genetic Algorithm Optimization Fatigue

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Efficient optimal design of passive structural control applied to isolator design

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SMART STRUCTURES AND SYSTEMS 2015年第3期15卷 847-862页

作者： Kamalzare, Mahmoud Johnson, Erik A. Wojtkiewicz, Steven F. Univ So Calif Sonny Astani Dept Civil & Environm Engn Los Angeles CA 90089 USA Clarkson Univ Dept Civil & Environm Engn Potsdam NY 13699 USA

Typical base isolated buildings are designed so that the superstructure remains elastic in design-level earthquakes, though the isolation layer is often quite nonlinear using, e.g., hysteretic elements such as lead-rubber bearings and friction pendulum bearings. Similarly, other well-performing structural control systems keep the structure within the linear range except during the most extreme of excitations. Design optimization of these isolators or other structural control systems requires computationally-expensive response simulations of the (mostly or fully) linear structural system with the nonlinear structural control devices. Standard nonlinear structural analysis algorithms ignore the localized nature of these nonlinearities when computing responses. This paper proposes an approach for the computationally-efficient optimal design of passive isolators by extending a methodology previously developed by the authors for accelerating the response calculation of mostly linear systems with local features (linear or nonlinear, deterministic or random). The methodology is explained and applied to a numerical example of a base isolated building with a hysteretic isolation layer. The computational efficiency of the proposed approach is shown to be significant for this simple problem, and is expected to be even more dramatic for more complex systems.

关键词： computationally-efficient simulation passive structural control optimal design lead-rubber bearings

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Design of viscous fluid passive structural control systems using pole assignment algorithm

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structural control & HEALTH MONITORING 2014年第7期21卷 1084-1099页

作者： Zare, A. R. Ahmadizadeh, M. Sharif Univ Technol Dept Civil Engn Tehran Iran

A methodology is developed for the design of optimum viscous fluid passive energy dissipation systems using pole assignment active control algorithm. In this method, the procedure to assign the new structural poles is slightly modified such that the resulting structural properties (i.e., the optimum locations of system poles) can be achieved merely by modification of structural stiffness and addition of a passive control system. A combination of stiffness reduction and increase of damping is utilized to reduce both acceleration and displacement response. It is shown that the control systems designed using this method provide structural performances slightly better than or close to those of ordinarily designed optimum passive systems. Furthermore, by an educated selection of the locations of the structural poles, the proposed method provides more versatility in the design of passive control systems. Copyright (c) 2013 John Wiley & Sons, Ltd.

关键词： active structural control passive structural control stiffness modification supplemental damping pole assignment algorithm

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Modelling and optimization of a passive structural control design for a spar-type floating wind turbine

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ENGINEERING STRUCTURES 2014年 69卷 168-182页

作者： Si, Yulin Karimi, Hamid Reza Gao, Huijun Univ Agder Fac Sci & Engn Dept Engn N-4898 Grimstad Norway Harbin Inst Technol Res Inst Intelligent Control & Syst Harbin 150001 Peoples R China

Compared with fixed-bottom installation, deep water floating wind turbine has to undergo more severe structural loads due to extra degrees of freedom. Aiming for effective load reduction, this paper deals with the evaluation of a passive structural control design for a spar-type floating wind turbine, and the proposed strategy is to install a tuned mass damper (TMD) into the spar platform. Firstly, a mathematical model for wind turbine surge-heave-pitch motion is established based on the D'Alembert's principle of inertial forces. Then, parameter estimation is performed by comparing the outputs from the proposed model and the state-of-the-art simulator. Further, different optimization methods are adopted to optimize TMD parameters when considering different performance indices. Finally, high fidelity non-linear simulations with previous optimized TMD designs are conducted under different wind and wave conditions. Simulation results demonstrate both the effectiveness and limitation of different TMD parameter choices, providing parametric analysis and design basis for future improvement on floating wind turbine load reduction with structural control methods. (C) 2014 Elsevier Ltd. All rights reserved.

关键词： Floating wind turbine Spar passive structural control Modelling Estimation Optimization FAST-SC

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Performance enhancement of High-rise connected structures by the Tuned Negative Stiffness Amplifying Damper

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STRUCTURES 2025年 71卷

作者： Zhang, Shangrong Xiong, Yang Lyu, Qing Fu, Bo Liu, Liangkun Ningxia Univ Sch Civil & Hydraul Engn Yinchuan 750021 Peoples R China Ningbo Univ Technol Sch Civil & Transportat Engn Ningbo 315211 Peoples R China Changan Univ Sch Civil Engn Xian 710061 Peoples R China Dongguan Univ Technol Sch Environm & Civil Engn Dongguan Peoples R China

To enhance the seismic performance of high-rise structures connected with an isolated sky-corridor, a tuned negative stiffness amplifying damper (TNSAD) was employed to control the seismic response of such structures in this study. The negative stiffness device (NSD) significantly amplifies the damping effect by increasing the stroke of the damper, making the TNSAD more effective in reducing the deformation of the isolation layer and the acceleration of the sky-corridor. The seismic performance of TNSAD is initially evaluated under stochastic excitations, and optimal parameters for TNSAD are determined through numerical search. Subsequently, the performance of TNSAD is investigated and verified under far-field (FF) ground motions, near-fault pulse-like (NFP) ground motions, and near-fault non-pulse (NFNP) ground motions. The results indicate that the optimal TNSAD can reduce isolator displacement by 20-40 % and corridor acceleration by 30-40 % under FF ground motions. It also performs well under both NFP and NFNP ground motions. Moreover, TNSAD contributes to diminishing the average response of the tower structure. The damping amplification mechanism of TNSAD endows it with an exceptional energy dissipation capacity, even at lower damping ratios. Compared to viscous dampers (VD) with a similar small damping ratio, TNSAD demonstrates a remarkable six times improvement in energy dissipation capabilities. These findings mark a significant advancement in the development of seismic performance for high-rise connected structures.

关键词： High-rise connected structure Tuned negative stiffness amplifying damper Stochastic response analysis Optimal analysis passive structural control Energy dissipation

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Intelligent Computational Methods for Optimal Distribution of Friction Dampers in Seismic Protection of Buildings

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IEEE TRANSACTIONS ON EMERGING TOPICS IN COMPUTATIONAL INTELLIGENCE 2024年第4期8卷 3055-3066页

作者： Kurucu, Mert Can Atam, Ercan Guzelkaya, Mujde Eksin, Ibrahim Istanbul Tech Univ Control & Automat Engn Dept TR-34485 Istanbul Turkiye

Seismic protection of multi-story buildings using friction dampers (FDs) is a cheap and effective passive structural control solution. For optimization of system response, optimal distribution of FDs between floors is required, which is a challenging problem. In this paper, we propose novel intelligent computational methods based on reinforcement learning for the distribution of n FDs for m-story buildings. In order to demonstrate the effectiveness of the proposed methods, a case study of optimally distributing 16 FDs in a 3-story building is considered, and the results are compared with the optimal solution found from a statistical analysis based on a large number of earthquake accelerations.

关键词： passive structural control seismic protection optimal friction damper placement artificial intelligence reinforcement learning

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Assessing the Effect of Different Configurations of Inerter-Based Devices for structural Vibration control 1

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16th International Conference on Dynamical Systems - Theory and Applications (DSTA)

作者： Chillemi, Miriam Furtmueller, Thomas Adam, Christoph Pirrotta, Antonina Univ Innsbruck Innsbruck Austria Univ Palermo Palermo Italy

ISBN: (数字)9783031564925

ISBN: (纸本)9783031564949;9783031564925;9783031564918

In order to control vibration-prone structures, the vibrations mitigation effect of well-known passive control systems such as Tuned Mass Dampers (TMDs) can be enhanced by using a mass amplification device called inerter. In this study, the behavior of this device and its influence on the response of vibration-prone systems are investigated by analyzing different configurations in a civil engineering context, finding optimized parameters, and assessing the performance of various systems with the inerter in different positions. Indeed, the position of the device can strongly influence the benefits obtained from the structural control design. Therefore, a more critical analysis is proposed with respect to previous studies on the use of inerter-based devices for vibration control, with the aim of consistently investigating the exploitation of these innovative systems in practical applications.

关键词： Inerter passive structural control Vibration absorber

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Conceptual design and dynamic analysis of a novel passive floating offshore wind turbine structure

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SHIPS AND OFFSHORE STRUCTURES 2021年第10期16卷 1040-1049页

作者： Liao, Minmao Wu, Yuxing Chongqing Univ Sch Civil Engn Chongqing 400045 Peoples R China Minist Educ Key Lab New Technol Construct Cities Mt Area Chongqing 400045 Peoples R China

In order to mitigate dynamic responses of floating offshore wind turbines (FOWTs) under combined wind-wave-current loading, employment of structural control techniques is often considered. In this paper, a novel concept of a passive FOWT structure is proposed to overcome the previous limitations on space and mass of tuned mass dampers (TMDs). The conceptual design is examined on the basis of a finite element model. The dynamic responses, mainly roll and pitch rotations, are compared between the controlled and uncontrolled FOWTs. Subsequently, a parametric study is conducted and the main parameters in the model are optimised accordingly. Finally, the optimal performance of the proposed FOWT structure demonstrates the effectiveness of the proposed design, and also its superiority over the existing concepts.

关键词： Floating offshore wind turbine spar-type passive structural control finite element parametric study

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Dynamics characteristics of geometrically nonlinear isolation systems for seismic protection of equipment

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EARTHQUAKE ENGINEERING & structural DYNAMICS 2021年第10期50卷 2795-2816页

作者： Hsu, Ting-Wei Chang, Chia-Ming Natl Taiwan Univ Dept Civil Engn 1Sec 4Roosevelt Rd Taipei 10617 Taiwan

Earthquakes pose risks to sensitive equipment and may result in dramatic economic loss. A widely used control strategy is to install an isolation system underneath equipment;however, excessive isolation displacements may be induced during severe earthquakes. Viscous dampers are recommended to be placed along with the isolation layer and to reduce displacements. Indeed, this combination is designed for a certain earthquake level and may be less effective in other earthquake levels. In this study, an isolation system with viscous dampers, which is installed perpendicular to the motion direction at the equilibrium position, is proposed to enhance seismic performance of important equipment through this geometrically nonlinear configuration. This configuration provides a better reduction in absolute accelerations during small-to-moderate earthquakes, while isolation displacements can be effectively mitigated during severe earthquakes. To understand the dynamic characteristics of this system, a series of investigations are carried out. The features of the effective control force are explored by the effective damping, and the phase plane analysis is conducted to understand the isolation system behavior. Then, the averaging method is employed to obtain the frequency-amplitude relationship of the proposed system, and the results inform the frequency domain behavior. The geometrically nonlinear damping is experimentally explored. control effectiveness of the proposed system is also evaluated under seismic excitation and compared with the conventional isolation system (i.e., viscous dampers installed parallel to the isolation motion direction). As a result, the viscous damper with geometric nonlinearity can be more adaptive to different earthquake levels and thereby improves seismic isolation performance.

关键词： base isolation systems effective damping geometrically nonlinear damping passive structural control seismic protection of equipment

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