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This paper aims to develop viscoelastic dampers, which can effectively suppress vibration in a wide frequency range. First, several viscoelastic materials for damping performance were selected, and different batches of cylindrical viscoelastic dampers were fabricated by overall vulcanization. Second, the dynamic mechanical properties of the cylindrical viscoelastic dampers under different amplitudes and frequencies are tested, and the hysteretic curves under different loading conditions are obtained. Finally, by calculating the dynamic mechanical properties of the cylindrical viscoelastic dampers, the energy dissipation performance of these different batches of viscoelastic dampers is compared and analyzed. The experimental results show that the cylindrical viscoelastic damper presents a full hysteretic curve in a wide frequency range, in which the maximum loss factor can reach 0.57. Besides, the equivalent stiffness, storage modulus, loss factor, and energy consumption per cycle of the viscoelastic damper raise with the frequency increasing, while the equivalent damping decreases with the increase of frequency. When the displacement increases, the energy consumption per cycle of the viscoelastic damper rises rapidly, and the equivalent stiffness, equivalent damping, storage modulus, and loss factor change slightly.
Teng Ge; Xing-Huai Huang; Ying-Qing Guo; Ze-Feng He; Zhong-Wei Hu. Investigation of Mechanical and Damping Performances of Cylindrical Viscoelastic Dampers in Wide Frequency Range. Actuators 2021, 10, 71 .
AMA StyleTeng Ge, Xing-Huai Huang, Ying-Qing Guo, Ze-Feng He, Zhong-Wei Hu. Investigation of Mechanical and Damping Performances of Cylindrical Viscoelastic Dampers in Wide Frequency Range. Actuators. 2021; 10 (4):71.
Chicago/Turabian StyleTeng Ge; Xing-Huai Huang; Ying-Qing Guo; Ze-Feng He; Zhong-Wei Hu. 2021. "Investigation of Mechanical and Damping Performances of Cylindrical Viscoelastic Dampers in Wide Frequency Range." Actuators 10, no. 4: 71.
Viscoelastic materials are a kind of representative passive vibration control materials with many applications in civil engineering for earthquake mitigation in building structures, and these materials often serve in a thermo-elastic coupling environment. In this work, a one-dimensional magneto-thermoviscoelastic problem of a single-layer viscoelastic plate is investigated with memory-dependent derivative and nonlocal effect in the context of generalized thermo-elasticity. The plate is placed in a magnetic field, and the upper surface is subjected to a thermal shock. The governing equations for the single-layer plate are formulated considering the time delay and the kernel function of the memory-dependent derivative, nonlocal effect, temperature-dependent properties, and magnetic field. The Laplace transform and its numerical inversion are employed to solve this problem. The nondimensional temperature, displacement, and stress are calculated and presented graphically. Based on the numerical results, the influence of time delay and kernel function of the memory-dependent derivative, nonlocal effect parameters, temperature-dependent properties, and magnetic field parameters on the distributions of the nondimensional temperature, displacement, and stress are discussed.
Yeshou Xu; Zhao-Dong Xu; Ying-Qing Guo; Yaorong Dong; Xinghuai Huang. A Generalized Magneto-Thermoviscoelastic Problem of a Single-Layer Plate for Vibration Control Considering Memory-Dependent Heat Transfer and Nonlocal Effect. Journal of Heat Transfer 2019, 141, 1 .
AMA StyleYeshou Xu, Zhao-Dong Xu, Ying-Qing Guo, Yaorong Dong, Xinghuai Huang. A Generalized Magneto-Thermoviscoelastic Problem of a Single-Layer Plate for Vibration Control Considering Memory-Dependent Heat Transfer and Nonlocal Effect. Journal of Heat Transfer. 2019; 141 (8):1.
Chicago/Turabian StyleYeshou Xu; Zhao-Dong Xu; Ying-Qing Guo; Yaorong Dong; Xinghuai Huang. 2019. "A Generalized Magneto-Thermoviscoelastic Problem of a Single-Layer Plate for Vibration Control Considering Memory-Dependent Heat Transfer and Nonlocal Effect." Journal of Heat Transfer 141, no. 8: 1.
In this work parameters are optimized for a proposed precision platform with a well-designed vibration isolation and mitigation (VIM) system, in which VIM devices, magnetorheological (MR) dampers and viscoelastic (VE) dampers are adopted to mitigate vibration responses. The optimization method is on the basis of the Non-dominated sorting genetic algorithm (NSGA-II), in which the dynamic responses as well as the maximum damping forces of MR dampers of the platform are chosen as objective functions. The optimization parameters, the constrain conditions and the objective functions are determined in accordance with the characteristics of the VIM system. Finally, a series of Pareto solutions are obtained and one Pareto solution is selected to compare with a preliminarily well designed VIM system. Numerical results show that the optimization method can effectively mitigate the vibration of the precision platform and reduce the maximum control forces of MR dampers simultaneously, which will lead to the miniaturization of MR dampers.
Zhao-Dong Xu; Xing-Huai Huang; Fei-Hong Xu; Jie Yuan. Parameters optimization of vibration isolation and mitigation system for precision platforms using non-dominated sorting genetic algorithm. Mechanical Systems and Signal Processing 2019, 128, 191 -201.
AMA StyleZhao-Dong Xu, Xing-Huai Huang, Fei-Hong Xu, Jie Yuan. Parameters optimization of vibration isolation and mitigation system for precision platforms using non-dominated sorting genetic algorithm. Mechanical Systems and Signal Processing. 2019; 128 ():191-201.
Chicago/Turabian StyleZhao-Dong Xu; Xing-Huai Huang; Fei-Hong Xu; Jie Yuan. 2019. "Parameters optimization of vibration isolation and mitigation system for precision platforms using non-dominated sorting genetic algorithm." Mechanical Systems and Signal Processing 128, no. : 191-201.
Viscoelastic dampers are one of the most popular earthquake mitigation devices for building structures with a large number of applications in civil engineering. The seismic performance of viscoelastic dampers is greatly affected by viscoelastic materials. The present paper addresses the theoretical and experimental studies of the viscoelastic damper. The regular polyhedron chain network models for viscoelastic materials are proposed based on the molecular chain network microstructures and the temperature–frequency equivalent principle. Several dynamic property tests for the viscoelastic damper at different temperatures, frequencies, and displacements are carried out, and the proposed models are verified by comparing the numerical and experimental results. The comparisons show that the viscoelastic damper has perfect energy dissipation capacity, and the regular polyhedron chain network models can well describe the mechanical properties of the viscoelastic damper at different environmental temperatures and excitation frequencies.
Yeshou Xu; Zhao-Dong Xu; Ying-Qing Guo; Teng Ge; Chao Xu; Xinghuai Huang. Theoretical and Experimental Study of Viscoelastic Damper Based on Fractional Derivative Approach and Micromolecular Structures. Journal of Vibration and Acoustics 2019, 141, 031010 .
AMA StyleYeshou Xu, Zhao-Dong Xu, Ying-Qing Guo, Teng Ge, Chao Xu, Xinghuai Huang. Theoretical and Experimental Study of Viscoelastic Damper Based on Fractional Derivative Approach and Micromolecular Structures. Journal of Vibration and Acoustics. 2019; 141 (3):031010.
Chicago/Turabian StyleYeshou Xu; Zhao-Dong Xu; Ying-Qing Guo; Teng Ge; Chao Xu; Xinghuai Huang. 2019. "Theoretical and Experimental Study of Viscoelastic Damper Based on Fractional Derivative Approach and Micromolecular Structures." Journal of Vibration and Acoustics 141, no. 3: 031010.
Xuchen Guan; Yingqing Guo; Xinghuai Huang. Research on Temperature Control System Based on WeChat Remote Operation. Proceedings of the 2018 International Conference on Computer Science, Electronics and Communication Engineering (CSECE 2018) 2018, 1 .
AMA StyleXuchen Guan, Yingqing Guo, Xinghuai Huang. Research on Temperature Control System Based on WeChat Remote Operation. Proceedings of the 2018 International Conference on Computer Science, Electronics and Communication Engineering (CSECE 2018). 2018; ():1.
Chicago/Turabian StyleXuchen Guan; Yingqing Guo; Xinghuai Huang. 2018. "Research on Temperature Control System Based on WeChat Remote Operation." Proceedings of the 2018 International Conference on Computer Science, Electronics and Communication Engineering (CSECE 2018) , no. : 1.
The development of damage identification methods that enable rapid implementation holds great promise for assessing structural integrity to avoid further damage or catastrophic failure. Here, an on-line model updating approach is proposed to rapidly and simultaneously identify the mass, stiffness, and damping properties of a structural model. The proposed approach facilitates identification of these unknown parameters using two steps: first, energy equilibrium equations are used to establish a relationship between structural energy and unknown parameters; second, the Kalman filter is adopted to obtain the unknown parameters in a short period of time. Numerical verification is conducted on a 158-degree-of-freedom truss model with 324 unknown parameters based on a real-world structure. The results indicate that the proposed approach can simultaneously identify the model parameters for the mass, stiffness, and damping of both the damaged and undamaged structures online, and also can effectively identify the stiffness damage and mass change, even in an environment with noise. Copyright © 2016 John Wiley & Sons, Ltd.
Xing-Huai Huang; Shirley Dyke; Zhuoxiong Sun; Zhao-Dong Xu. Simultaneous identification of stiffness, mass, and damping using an on-line model updating approach. Structural Control and Health Monitoring 2016, 24, e1892 .
AMA StyleXing-Huai Huang, Shirley Dyke, Zhuoxiong Sun, Zhao-Dong Xu. Simultaneous identification of stiffness, mass, and damping using an on-line model updating approach. Structural Control and Health Monitoring. 2016; 24 (4):e1892.
Chicago/Turabian StyleXing-Huai Huang; Shirley Dyke; Zhuoxiong Sun; Zhao-Dong Xu. 2016. "Simultaneous identification of stiffness, mass, and damping using an on-line model updating approach." Structural Control and Health Monitoring 24, no. 4: e1892.
In research on damage identification, conventional methods usually face difficulties in converging globally and rapidly. Therefore, a fast in-time damage identification approach based on the Kalman filter and energy equilibrium theory is proposed to obtain the structural stiffness, find the locations of damage, and quantify its intensity. The proposed approach establishes a relationship between the structural stiffness and acceleration response by means of energy equilibrium theory. After importing the structural energy into the Kalman filter algorithm, unknown parameters of the structure can be obtained by comparing the predicted energy and the measured energy in each time step. Numerical verification on a highway sign support truss with and without damage indicates that the updated Young’s modulus can converge to the true value rapidly, even under the effects of external noise excitation. In addition, the calculation time taken for each step of the approach is considerably shorter than the sampling period (1/256 s), which means that, this approach can be implemented in-time and on-line. 建立一种损伤识别方法, 能够实时地监测多自由度复杂结构中构件的损伤情况。 1. 用能量原理对结构刚度进行解构, 建立结构单元刚度和节点响应之间的关系; 2. 用Kalman滤波原理分析结构刚度的预测值和测量值, 迅速对结构的刚度进行识别(图6-9); 3. 对每一步计算进行耗时监测, 确保算法的实时性(图10)。 1. 该方法能够较准确地得到结构的刚度信息, 同时得出损伤单元的损伤位置和损伤量; 并且收敛速度快, 计算量小, 具有很强的实时性和抗噪能力; 2. 对于本文的桁架结构, 所有杆件刚度均能在0.4 s内收敛, 平均每一荷载步计算时间约为0.0012 s, 小于采样周期1/256 s, 说明该方法可以迅速、 准确地对结构进行实时的监测。
Xing-Huai Huang; Shirley J Dyke; Zhao-Dong Xu. An in-time damage identification approach based on the Kalman filter and energy equilibrium theory. Journal of Zhejiang University-SCIENCE A 2015, 16, 105 -116.
AMA StyleXing-Huai Huang, Shirley J Dyke, Zhao-Dong Xu. An in-time damage identification approach based on the Kalman filter and energy equilibrium theory. Journal of Zhejiang University-SCIENCE A. 2015; 16 (2):105-116.
Chicago/Turabian StyleXing-Huai Huang; Shirley J Dyke; Zhao-Dong Xu. 2015. "An in-time damage identification approach based on the Kalman filter and energy equilibrium theory." Journal of Zhejiang University-SCIENCE A 16, no. 2: 105-116.
Ming-Fei Yang; Zhao-Dong Xu; Xing-Huai Huang; Han-Hu Ye. Analysis of the Collapse of Long-Span Reticulated Shell Structures Under Multi-Dimensional Seismic Excitations. The International Journal of Acoustics and Vibration 2014, 19, 1 .
AMA StyleMing-Fei Yang, Zhao-Dong Xu, Xing-Huai Huang, Han-Hu Ye. Analysis of the Collapse of Long-Span Reticulated Shell Structures Under Multi-Dimensional Seismic Excitations. The International Journal of Acoustics and Vibration. 2014; 19 (1):1.
Chicago/Turabian StyleMing-Fei Yang; Zhao-Dong Xu; Xing-Huai Huang; Han-Hu Ye. 2014. "Analysis of the Collapse of Long-Span Reticulated Shell Structures Under Multi-Dimensional Seismic Excitations." The International Journal of Acoustics and Vibration 19, no. 1: 1.
Zhao-Dong Xu; Xing-Huai Huang; Yi-Feng Guo; Shao-An Wang. Study of the properties of a multi-dimensional earthquake isolation device for reticulated structures. Journal of Constructional Steel Research 2013, 88, 63 -78.
AMA StyleZhao-Dong Xu, Xing-Huai Huang, Yi-Feng Guo, Shao-An Wang. Study of the properties of a multi-dimensional earthquake isolation device for reticulated structures. Journal of Constructional Steel Research. 2013; 88 ():63-78.
Chicago/Turabian StyleZhao-Dong Xu; Xing-Huai Huang; Yi-Feng Guo; Shao-An Wang. 2013. "Study of the properties of a multi-dimensional earthquake isolation device for reticulated structures." Journal of Constructional Steel Research 88, no. : 63-78.
The semi-active control technology has been paid more attention in the field of structural vibration control due to its high controllability, excellent control effect and low power requirement. When semi-active control device are used for vibration control, some challenges must be taken into account, such as the reliability and the control strategy of the device. This study presents a new large tonnage compound lead extrusion magnetorheological (CLEMR) damper, whose mathematical model is introduced to describe the variation of damping force with current and velocity. Then a current controller based on the fuzzy logic control strategy is designed to determine control currents of the CLEMR dampers rapidly. A ten-floor frame structure with CLEMR dampers using the fuzzy logic control strategy is built and calculated by using MATLAB. Calculation results show that CLEMR dampers can reduce the seismic responses of structures effectively. Calculation results of the fuzzy logic control strategy are compared with those of the semi-active limit Hrovat control structure, the passive-off control structure, and the uncontrolled structure. Comparison results show that the fuzzy logic control strategy can determine control currents of CLEMR dampers quickly and can reduce seismic responses of the structures more effectively than the passive-off control strategy and the uncontrolled structure.
Xiang-Cheng Zhang; Zhao-Dong Xu; Xing-Huai Huang; Jun-Tao Zhu. Fuzzy logic control of the building structure with CLEMR dampers. SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring 2013, 8688, 1 .
AMA StyleXiang-Cheng Zhang, Zhao-Dong Xu, Xing-Huai Huang, Jun-Tao Zhu. Fuzzy logic control of the building structure with CLEMR dampers. SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring. 2013; 8688 ():1.
Chicago/Turabian StyleXiang-Cheng Zhang; Zhao-Dong Xu; Xing-Huai Huang; Jun-Tao Zhu. 2013. "Fuzzy logic control of the building structure with CLEMR dampers." SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring 8688, no. : 1.
Parameter optimization analysis on the multi-dimensional earthquake isolation and mitigation device (MEIMD) installed in reticulated structures is carried out in this study. First, optimization parameters and constrain conditions are determined in accordance with the characteristics of MEIMD, and an object function is derived from the energy equation. Then, the genetic algorithm is used to realize parameter optimization of the MEIMD added in a cylindrical reticulated shell. Finally, in order to verify the effectiveness of the proposed optimization method, dynamic responses of structures without devices, with devices possessing random and optimal parameters are compared, and the sensitivity to the earthquake excitations of the optimization method is studied. It can be concluded that dynamic responses of the structure decrease obviously when adding the MEIMD, and a better seismic reduction effect can be reached when the MEIMD is designed optimally in accordance with the optimization method, and different earthquake excitations have slight influence on the optimization results.
Zhao-Dong Xu; Yi-Feng Guo; Shao-An Wang; Xing-Huai Huang. Optimization analysis on parameters of multi-dimensional earthquake isolation and mitigation device based on genetic algorithm. Nonlinear Dynamics 2013, 72, 757 -765.
AMA StyleZhao-Dong Xu, Yi-Feng Guo, Shao-An Wang, Xing-Huai Huang. Optimization analysis on parameters of multi-dimensional earthquake isolation and mitigation device based on genetic algorithm. Nonlinear Dynamics. 2013; 72 (4):757-765.
Chicago/Turabian StyleZhao-Dong Xu; Yi-Feng Guo; Shao-An Wang; Xing-Huai Huang. 2013. "Optimization analysis on parameters of multi-dimensional earthquake isolation and mitigation device based on genetic algorithm." Nonlinear Dynamics 72, no. 4: 757-765.
In order to investigate the collapse mode of double-layer space trusses, the whole collapse process is simulated by the explicit finite element methods. The calculation results indicate that horizontal earthquake and vertical earthquake waves will lead to two typical collapse modes of the structure. The collapse mode of the structure under horizontal earthquake are mainly strength failure, which is characterized by the failure of members connected to the columns; the collapse mode of the structure under vertical earthquake are mainly dynamic instability, which is characterized by the V shape deformation. The analytical results agree with the experimental results.
Xing Huai Huang; Zhao Dong Xu; Ming Fei Yang. Collapse Modes of a Double-Layer Space Truss Subjected to Multi-Dimensional Earthquakes. Applied Mechanics and Materials 2012, 166-169, 2234 -2237.
AMA StyleXing Huai Huang, Zhao Dong Xu, Ming Fei Yang. Collapse Modes of a Double-Layer Space Truss Subjected to Multi-Dimensional Earthquakes. Applied Mechanics and Materials. 2012; 166-169 ():2234-2237.
Chicago/Turabian StyleXing Huai Huang; Zhao Dong Xu; Ming Fei Yang. 2012. "Collapse Modes of a Double-Layer Space Truss Subjected to Multi-Dimensional Earthquakes." Applied Mechanics and Materials 166-169, no. : 2234-2237.
Earthquake excitation is a kind of complicated multi-dimensional ground motion. Therefore, anti-earthquake measuresfor complex and important engineering structures, such as long-span structures and high rise buildings under multi-dimensional earthquake excitations, have become an extremely important research topic. In this paper, a new multi-dimensional earthquake isolation and mitigation device (MEIMD) is proposed for protecting long-span reticulated structures due to strong earthquake motions. It consists of a viscoelastic bearing and several viscoelastic dampers. Property tests on the MEIMD under different excitation frequencies, excitation amplitudes and vertical pressure forces are carried out. Then, a mathematical simulation is carried out for the equivalent stiffness and the equivalent damping of the device, and the numerical results agree reasonably well with the experimental data. Experimental and numerical results show that the MEIMD has a fine energy dissipation capacity, and can be used for anti-earthquake purposes for long-span reticulated structures.
Zhao-Dong Xu; Xing-Huai Huang; Li-Heng Lu. Experimental study on horizontal performance of multi-dimensional earthquake isolation and mitigation devices for long-span reticulated structures. Journal of Vibration and Control 2011, 18, 941 -952.
AMA StyleZhao-Dong Xu, Xing-Huai Huang, Li-Heng Lu. Experimental study on horizontal performance of multi-dimensional earthquake isolation and mitigation devices for long-span reticulated structures. Journal of Vibration and Control. 2011; 18 (7):941-952.
Chicago/Turabian StyleZhao-Dong Xu; Xing-Huai Huang; Li-Heng Lu. 2011. "Experimental study on horizontal performance of multi-dimensional earthquake isolation and mitigation devices for long-span reticulated structures." Journal of Vibration and Control 18, no. 7: 941-952.