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Chinese Journal of Chemical Engineering 2024年第3期67卷 1-8页

作者： Wei Guo Yan Zhang Xiaxin Lei Shuang Wang College of Physics Taiyuan University of TechnologyJinzhong 030600China College of Environmental Science and Engineering Taiyuan University of TechnologyJinzhong 030600China Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization Taiyuan University of TechnologyTaiyuan 030024China

In this work,a new ZnO/CoNiO_(2)/CoO/C metal oxides composite is prepared by cost-effective hydrothermal method coupled with annealing process under N_(2) atmosphere.Notably,the oxidation-defect annealing environment is conducive to both morphology and component of the composite,which flower-like ZnO/CoNiO_(2)/CoO/C is obtained.Benefited from good chemical stability of ZnO,high energy capacity of CoNiO_(2) and CoO and good conductivity of C,the as-prepared sample shows promising electrochemical behavior,including the specific capacity of 1435 C·g^(-1) at 1 A·g^(-1),capacity retention of 87.3%at 20 A·g^(-1),and cycling stability of 90.5%for 3000 cycles at 5 A·g^(-1),respectively.Furthermore,the prepared ZnO/CoNiO_(2)/CoO/C/NF//AC aqueous hybrid supercapacitors device delivers the best specific energy of 55.9 W·h·kg^(-1) at 850 W·kg^(-1).The results reflect that the as-prepared ZnO/CoNiO_(2)/CoO/C microflowers are considered as high performance electrode materials for supercapacitor,and the strategy mentioned in this paper is benefit to prepare mixed metal oxides composite for energy conversion and storage.

关键词： Composites Electrochemistry Hydrothermal Transition metal oxides structural control Supercapacitors

Recent advances in structural control research and applications in China mainland

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Earthquake Engineering and Engineering Vibration 2003年第1期2卷 117-132页

作者：吕西林赵斌 State Key Laboratory for Disaster Reduction in Civil Engineering Tongji UniversityShanghai 200092China Professor State Key Laboratory for Disaster Reduction in Civil Engineering Tongji UniversityShanghai 200092China Associate Professor

The recent developments of theoretical research, model tests and engineering applications of structural control in China's Mainland are reviewed in this paper. It includes seismic isolation, passive energy dissipation, active and semi-active control, smart materials and smart structural systems. It can be seen that passive control methods, such as seismic isolation and energy dissipation methods, have developed into the mature stage in China. At the same time, great progress has been made in active and semi-active control, and smart actuators or smart dampers and smart structural systems. Finally, some future research initiatives for structural control in civil engineering are suggested. Keywords state-of-the-art review - structural control - seismic isolation - passive energy dissipation - active and semi-active control - smart material and smart structure Supported by : National Natural Science Foundation of China (Grant No. 50025821)

关键词： state-of-the-art review structural control seismic isolation passive energy dissipation active and semi-active control smart material and smart structure

Wireless Sensing and control of structural Vibration from Earthquake

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Wireless Sensing and Control of Structural Vibration from Ea...

Static control method using gradient-genetic algorithm for grillage adaptive beam string structures based on minimal internal force

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作者： Dyke Shirley J Veto Rebecca School of Engineering and Applied Science Washington UinversitySt.LouisMO 63130USA

This paper presents the feasibility of wireless sensing technology in seismic response control of structures.A shaking table test of a 3-story steel structure using MICA2 motes with accelerometers is conducted at Washington University structural control and Earthquake Engineering Lab.Magnetorheological（MR）dampers are adopted as actuators.Based on wireless acceleration feedback of the structures and wired force feedback of MR dampers,a bang-bang clipped optimal control algorithm is developed to command the MR damper.The experimental results indicate that the proposed control scheme can effectively mitigate the response of the structure.

关键词： Wireless Sensors MR Dampers Protective Systems structural control Shaking Table Test

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2022年第9期23卷 721-732页

作者： Yan-bin SHEN Hao-song SUN An-dong LEI Xiao-yuan YING Guang YANG Yao-zhi LUO College of Civil Engineering and Architecture Zhejiang UniversityHangzhou 310058China China State Construction Engineering(Hong Kong)Limited Hong Kong 999077China

The grillage adaptive beam string structure(GABSS)is a new type of smart structure that can self-adjust its deformation and internal forces through a group of active struts(actuators)in response to changes in environmental conditions.In this paper,an internal force control method based on a gradient–genetic algorithm(GGA)is proposed for the static control of a tensioned structure(especially the GABSS).Specifically,an optimization model of the GABSS is established in which the adjustment values of the actuators are set as the control variables,and the internal force of the beam is set as the objective function.The improved algorithm has the advantage of the global optimization ability of the genetic algorithm and the local search ability of the gradient algorithm.Two examples are provided to illustrate the application of the GGA method.The results show that the proposed method is practical for solving the internal force control problem of the GABSS.

关键词： Grillage adaptive beam string structure(GABSS) Gradient-genetic algorithm(GGA) structural control Adaptive structure Actuator

Simulation research on the energy dissipation and shock absorption performance of a swing column device based on fuzzy control

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Earthquake Engineering and Engineering Vibration 2022年第4期21卷 987-998页

作者： Zheng Yong Yuan Bo Research Center of Space Structures Guizhou UniversityGuiyang 550004China College of Civil Engineering Guizhou UniversityGuiyang 550004China Key Laboratory of structural Engineering of Guizhou Province Guiyang 550025China

Double-column bridge piers are prone to local damage during earthquakes,leading to the destruction of bridges.To improve the earthquake resistance of double-column bridge piers,a novel swing column device(SCD),consisting of a magnetorheological(MR)damper,a current controller,and a swing column,was designed for the present work.To verify the seismic energy dissipation ability of the SCD,a lumped mass model for a double-column bridge pier with the SCD was established according to the low-order modeling method proposed by Steo.Furthermore,the motion equation of the double-column bridge pier with the SCD was established based on the D′Alembert principle and solved with the use of computational programming.It was found that the displacement response of the double-column bridge pier was effectively controlled by the SCD.However,due to rough current selection and a time delay,there is a significant overshoot of the bridge acceleration using SCD.Hence,to solve the overshoot phenomenon,a current controller was designed based on fuzzy logic theory.It was found that the SCD design based on fuzzy control provided an ideal shock absorption effect,while reducing the displacement and acceleration of the bridge pier by 36.43%‒40.63%and 30.06%‒33.6%,respectively.

关键词： swing column device double-column bridge pier fuzzy control MR damper structural control low-element modeling method

Mathematical modeling and full-scale shaking table tests for multi-curve buckling restrained braces

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Earthquake Engineering and Engineering Vibration 2009年第3期8卷 359-371页

作者： C. S. Tsai Yungchang Lin Wenshin Chen H. C. Su Department of Civil Engineering Feng Chia University Taichung Chinese Taipei Graduate Institute of Civil and Hydraulic Engineering Feng Chia University Taichung Chinese Taipei Department of Water Resources Engineering and Conservation Feng Chia University Taichung Chinese Taipei

Buckling restrained braces （BRBs） have been widely applied in seismic mitigation since they were introduced in the 1970s. However, traditional BRBs have several disadvantages caused by using a steel tube to envelope the mortar to prevent the core plate from buckling, such as： complex interfaces between the materials used, uncertain precision, and time consumption during the manufacturing processes. In this study, a new device called the multi-curve buckling restrained brace （MC-BRB） is proposed to overcome these disadvantages. The new device consists of a core plate with multiple neck portions assembled to form multiple energy dissipation segments, and the enlarged segment, lateral support elements and constraining elements to prevent the BRB from buckling. The enlarged segment located in the middle of the core plate can be welded to the lateral support and constraining elements to increase buckling resistance and to prevent them from sliding during earthquakes. Component tests and a series of shaking table tests on a full-scale steel structure equipped with MC-BRBs were carried out to investigate the behavior and capability of this new BRB design for seismic mitigation. The experimental results illustrate that the MC-BRB possesses a stable mechanical behavior under cyclic loadings and provides good protection to structures during earthquakes. Also, a mathematical model has been developed to simulate the mechanical characteristics of BRBs.

关键词： buckling restrained brace energy absorption passive control earthquake energy plasticity model structural control multi-curve BRB

Robust H_∞ control for aseismic structures with uncertainties in model parameters

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Earthquake Engineering and Engineering Vibration 2007年第4期6卷 409-416页

作者：宋刚林家浩赵岩 W. Paul Howson Fred W Williams State Key Laboratory of structural Analysis for Industrial Equipment Faculty of Vehicle Engineering and Mechanics Dalian University of Technology Cardiff School of Engineering Cardiff University Cardiff CF24 3AA Wales U.K.

This paper presents a robust H∞ output feedback control approach for structural systems with uncertainties in model parameters by using available acceleration measurements and proposes conditions for the existence of such a robust output feedback controller. The uncertainties of structural stiffness, damping and mass parameters are assumed to be norm-bounded. The proposed control approach is formulated within the framework of linear matrix inequalities, for which existing convex optimization techniques, such as the LM1 toolbox in MATLAB, can be used effectively and conveniently. To illustrate the effectiveness of the proposed robust H∞ strategy, a six-story building was subjected both to the 1940 E1 Centro earthquake record and to a suddenly applied Kanai-Tajimi filtered white noise random excitation. The results show that the proposed robust H∞ controller provides satisfactory results with or without variation of the structural stiffness, damping and mass parameters.

关键词： structural control robust H∞ control linear matrix inequality dynamic output feedback parameter uncertainty seismic excitation

Non-probabilistic reliability method and reliability-based optimal LQR design for vibration control of structures with uncertain-but-bounded parameters

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Acta Mechanica Sinica 2013年第6期29卷 864-874页

作者： Shu-Xiang Guo Ying Li Faculty of Mechanics College of ScienceAir Force Engineering University

Uncertainty is inherent and unavoidable in almost all engineering systems. It is of essential significance to deal with uncertainties by means of reliability approach and to achieve a reasonable balance between reliability against uncertainties and system performance in the control design of uncertain systems. Nevertheless, reliability methods which can be used directly for analysis and synthesis of active control of structures in the presence of uncertainties remain to be developed, especially in non-probabilistic uncertainty situations. In the present paper, the issue of vibration con- trol of uncertain structures using linear quadratic regulator （LQR） approach is studied from the viewpoint of reliabil- ity. An efficient non-probabilistic robust reliability method for LQR-based static output feedback robust control of un- certain structures is presented by treating bounded uncertain parameters as interval variables. The optimal vibration con- troller design for uncertain structures is carried out by solv- ing a robust reliability-based optimization problem with the objective to minimize the quadratic performance index. The controller obtained may possess optimum performance un- der the condition that the controlled structure is robustly re- liable with respect to admissible uncertainties. The proposed method provides an essential basis for achieving a balance between robustness and performance in controller design ot uncertain structures. The presented formulations are in the framework of linear matrix inequality and can be carried out conveniently. Two numerical examples are provided to illustrate the effectiveness and feasibility of the present method.

关键词： structural control Vibration control Robust control Linear quadratic regulator （LQR） Robust reliabil- ity structural reliability

Tri-directional shaking table tests of vibration sensitive equipment with static dynamics interchangeable-ball pendulum system

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Earthquake Engineering and Engineering Vibration 2010年第1期9卷 103-112页

作者： C.S. Tsai Yung-Chang Lin Wen-Shin Chen H.C. Su D G epartment of Civil Engineering Feng Chia University Taichung Chinese Taipei Graduate Institute of Civil and Hydraulic Engineering Feng Chia University Taichung Chinese Taipei Department of Water Resources Engineering and Conservation Feng Chia University Taichung Chinese Taipei

Recently, the high-tech industry has become a key industry for economic development in many countries. However, vibration sensitive equipment located in these industrial buildings is vulnerable during earthquakes, which may cause huge economic loss. In this study, an innovative isolator for safeguarding the vibration sensitive equipment, namely, the static dynamics interchangeable^all pendulum system （SDI-BPS） is proposed and investigated to examine its protective capability for the vibration sensitive equipment during earthquakes through a series of tri-directional shaking table tests. The experimental results illustrate that the SDI-BPS isolator can provide significant damping to rolling types of base isolation systems for reducing the bearing displacement and size, and avoid the stress concentration, which can cause damage or scratches on the rolling surface of the isolator, to prolong its life span of service. The SDI-BPS isolator also provides excellent capability in protecting the vibration sensitive equipment and exhibits a stable behavior under long terms of service loadings and earthquakes.

关键词： ball pendulum system critical equipment base isolation vibration sensitive equipment base isolator passive control earthquake engineering structural control

Active control of highway bridges subject to a variety of earthquake loads

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Earthquake Engineering and Engineering Vibration 2015年第2期14卷 253-263页

作者： Ryan Mitchell Young-Jin Cha Yeesock Kim Aniket Anil Mahajan Department of Civil and Environmental Engineering Worcester Polytechnic Institute (WPI) Worcester MA 01609-2280 USAGraduate Research Assistant Department of Civil Engineering University of Manitoba Winnipeg MB R3L5V6 Canada Assistant Professor Department of Civil and Environmental Engineering Worcester Polytechnic Institute (WPI) Worcester MA 01609-2280 USA Department of Civil and Environmental Engineering Worcester Polytechnic Institute (WPI) Worcester MA 01609-2280 USA Graduate Research Assistant

In this paper, a wavelet-fi ltered genetic-neuro-fuzzy(WGNF) control system design framework for response control of a highway bridge under various earthquake loads is discussed. The WGNF controller is developed by combining fuzzy logic, discrete wavelet transform, genetic algorithms, and neural networks for use as a control algorithm. To evaluate the performance of the WGNF algorithm, it is tested on a highway bridge equipped with hydraulic actuators. It controls the actuators installed on the abutments of the highway bridge structure. Various earthquakes used as input signals include an artifi cial earthquake, the El-Centro, Kobe, North Palm Springs, Turkey Bolu, Chi-Chi, and Northridge earthquakes. It is proved that the WGNF control system is effective in mitigating the vibration of the highway bridge under a variety of seismic excitation.

关键词： structural control wavelet transform genetic algor