共查询到20条相似文献，搜索用时 141 毫秒
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ＭＡＴＨＥＭＡＴＩＣＡＬＭＯＤＥＬＦＯＲＳＥＤＩＭＥＮＴＴＲＡＮＳＰＯＲＴＣＡＰＡＣＩＴＹＯＦＨＹＰＥＲＣＯＮＣＥＮＴＲＡＴＥＤＦＬＯＷＩＮＤＩＶＥＲＳＩＯＮＣＡＮＡＬＳ￥ＣＡＯＲｕｘｕａｎ；ＷＵＰｅｉａｎ；ＲＥＮＸｉａｏｆｅｎｇａｎｄＬＩＵＭｉｎｇ... 相似文献
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ＯＮＴＨＥＤＥＰＯＳＩＴＩＯＮＡＬＤＹＮＡＭＩＣＳＯＦＧＵＡＮＲＥＥＳＴＵＡＲＹＺＨＡＮＧＤｏｎｇｓｈｅｎｇ；ＺＨＡＮＧＣｈａｎｇｋｕａｎａｎｄＤＩＮＧＸｉａｎｒｏｎｇ（Ｐｒｏｆ．ＨｏｈａｉＵｎｉｖｅｒｓｉｔｙ，Ｎａｎｊｉｎｇ，Ｃｈｉｎａ）（Ａｓｓ，... 相似文献
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ＭＡＴＨＥＭＡＴＩＣＭＯＤＥＬＡＮＤＥＸＰＥＲＩＭＥＮＴＡＬＳＴＵＤＹＯＮＡＤＳＯＲＢＩＮＧＯＩＬＢＹＳＥＤＩＭＥＮＴＷｅｎｑｉａｎＺＨＡＯ１ａｎｄＸｉａｏｂｏＣＡＯ２ａｎｄＱｉｎｓｈｅｎｇＨＵＡＮＧ３ＡＢＳＴＲＡＣＴＴｈｅｃｈａｒａｃｔｅｒｉｓｔ... 相似文献
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PRESENT STATUS OF EXPERIMENTAL STUDY ON HEAVY METAL POLLUTANT ADSORPTION－DESORPTION BY SEDIMENT IN CHINA 总被引：1，自引：0，他引：1
ＰＲＥＳＥＮＴＳＴＡＴＵＳＯＦＥＸＰＥＲＩＭＥＮＴＡＬＳＴＵＤＹＯＮＨＥＡＶＹＭＥＴＡＬＰＯＬＬＵＴＡＮＴＡＤＳＯＲＰＴＩＯＮ－ＤＥＳＯＲＰＴＩＯＮＢＹＳＥＤＩＭＥＮＴＩＮＣＨＩＮＡＨＵＡＮＧＳｕｉｌｉａｎｇａｎｄＷＡＮＺｈａｏｈｕｉ（Ｐｏｓｔｄｏｃ... 相似文献
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海洋平台结构振动的AMD主动控制参数优化分析 总被引：5，自引：0，他引：5
本文针对海洋平台结构的冰激振动和地震反应控制问题，提出了采用AMD主动控制的控制策略，结合JZ20－2MUQ平台结构进行了AMD控制系统的硬参数和软参数的优化分析，并就相应于最优参数下的AMD控制海洋平台结构冰激振动和地震反应的几种代表性工况进行了时程分析，得到了一些定性和定量的结论，为实际工程的控制设计提供了基础。本文提出的AMD主动控制方法对类似的海洋平台结构的控制问题也有参考价值。 相似文献
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An Active Mass Driver (AMD) system is proposed to suppress actively the response of a building to irregular external excitations such as earthquakes and typhoons. This system has been introduced to an actual ten-storey office building for the first time in the world. The system controls the motions of a structure by means of an external energy supply. It consists of an auxiliary mass installed in a building and an actuator that operates the mass and produces a control force which counters disturbances to the building. The design method of the AMD system, including the location of the installation and the capacity and stability of the system, is proposed. Simplification of the control algorithm is also described. 相似文献
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In active control, the control force execution time delay cannot be avoided or eliminated even with present technology, which can be critical to the performance of the control system. This paper investigates the influence of time delay on the stability of an SDOF system with an optimal direct output feedback controlled mass damper. An active mass damper system can take the form of a hybrid mass damper (HMD) or a fully active mass damper (AMD) depending upon imposed design constraints resulting from space, strength and power limitations. Explicit formulas and numerical solutions to determine the maximum delay time which causes onset of system instability are obtained. The control effect of the two‐DOF HMD/AMD benchmark system with and without time delay is illustrated quantitatively in a continuous‐time approach. In order to fit the digital implementation of the computer‐controlled system in practice, the control gains will be compensated by using their discrete‐time version to overcome the degradation of control effect due to time delay. Copyright © 2001 John Wiley & Sons, Ltd. 相似文献
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To resolve difficulties encountered by current technology in structural control against earthquakes, this study proposes a novel high‐performance active mass driver (HP‐AMD) system. Based on an active mass driver system, the device is integrated with a mechanical pulley system for stroke amplification to enhance simultaneously efficiency and save power. Meanwhile, an instantaneous optimal direct output feedback control algorithm is derived alongside the hardware development. Numerical simulation is performed using a five‐storey steel frame as the object structure under the 1940 El Centro earthquake. To gain further insight into the HP‐AMD system, the effects of stroke amplification as well as damper weight on system performance are explored. Analysis results demonstrate that the proposed HP‐AMD system is a promising means to improving current active structural control techniques. Copyright © 2000 John Wiley & Sons, Ltd. 相似文献
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This study investigates an electric‐type active mass driver (AMD) system for structural vibration control. Composed primarily of an electric servomotor and a ball screw, the electrical AMD system is free from noise problems, oil leakage, and labor‐intensive maintenance that commonly are associated with hydraulic AMD systems. The desired stroke amplification of the mass and the power demand of the servomotor can be adjusted via the ball screw pitch, which in turn affects the effectiveness and efficiency of the system. Meanwhile, an instantaneous optimal direct output feedback control algorithm is adopted. Numerical simulation is performed using a five‐story steel frame as the object structure under the conditions of the 1940 El Centro earthquake. The AMD system proves to be effective and efficient within a certain range of the ball screw pitch. The reductions of the peak responses can reach as high as 70% if properly designed. Requiring only the velocity measurement of the top floor for on‐line feedback control, the proposed control algorithm is recommended for practical implementation. Copyright © 2004 John Wiley & Sons, Ltd. 相似文献
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结构振动控制的半主动磁流变质量驱动器(MR-AMD) 总被引：14，自引：1，他引：14
本文首先提出了一种新型的半主动磁流变质量驱动器（MR－AMD），该装置用磁流变驱动器替代AMD的液压驱动系统；其次采用所提出的半主动控制算法仿真分析了MR－AMD用于结构振动控制的有效性；第三，比较了半主动质量驱动器（MR－AMD）、调谐质量阻尼器（TMD）及主动质量驱动器（AMD）对同一模型结构的控制效果。分析结果表明，MR－AMD作为一种半主动质量驱动器有效地降低了结构的反应，其控制效果虽然不如具有相同质量块参数的AMD但却优于TMD，且同AMD一样具有较宽的有效频带范围。 相似文献
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In our previous study (Earthquake Engineering and Structural Dynamics 2003; 32 :2301), we have developed a probabilistic algorithm for active control of structures. In the probabilistic control algorithm, the control force is determined by the probability that the structural energy exceeds a specified target critical energy, and the direction of a control force is determined by the Lyapunov controller design method. In this paper, an experimental verification of the proposed probabilistic control algorithm is presented. A three‐story test structure equipped with an active mass driver (AMD) has been used. The effectiveness of the control algorithm has been examined by exciting the test structure using a sinusoidal signal, a scaled El Centro earthquake and a broadband Gaussian white noise; and, especially, experiments on control have been performed under different conditions to that of system identification in order to prove the stability and robustness of the proposed control algorithm. The experimental results indicate that the probabilistic control algorithm can achieve a significant response reduction under various types of ground excitations even when the modeling error exists. Copyright © 2004 John Wiley & Sons, Ltd. 相似文献
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结构模型的AMD主动控制试验 总被引：13，自引：1，他引：12
本文介绍了作者研究设计的ＡＭＤ装置。采用五层钢框架１：４模型ＡＭＤ系统安装在模型的顶层,采用多种地震动加速度记录在哈尔滨建筑大学力学与结构实验中心的地震模拟振动台上进行了结构的ＡＭＤ主动控制试验。试验结果表明：ＡＭＤ主动控制系统对结构地震反应的控制是非常有效的。 相似文献
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Yoshiki Ikeda 《地震工程与结构动力学》2016,45(13):2185-2205
This study proposes a new design method for an active mass damper (AMD) that is based on auto‐regressive exogenous models of a building structure. The proposed method uses the results of system identification in the field of active structural control. The uncontrolled structure is identified as auto‐regressive exogenous models via measurements under earthquake excitation and forced vibration. These models are linked with an equation of motion for the AMD to introduce a state equation and output equation for the AMD–structure interaction system in the discrete‐time space; the equations apply modern control theories to the AMD design. In the numerical applications of a 10‐degree‐of‐freedom building structure, linear quadratic regulator control is used to understand the fundamental characteristics of the proposed design procedure. The feedback control law requires the AMD's acceleration, velocity and stroke; the structure's acceleration; and the ground acceleration as vibration measurements. The numerical examples confirm the high applicability and control effectiveness of the proposed method. One remarkable advantage of the proposed method is that an equation of motion for the structure becomes unnecessary for designing controllers. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
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The objective of this paper is to present incremental dynamic analysis (IDA) and seismic performance evaluation results for a two-story cold-formed steel (CFS)–framed building. The archetype building was designed to current U.S. standards and then subjected to full-scale shake table tests under the U.S. National Science Foundation Network for Earthquake Engineering Simulation (NEES) program. Test results showed that the building's stiffness and capacity were considerably higher than expected and the building suffered only nonstructural damage even at excitations in excess of Maximum Considered Earthquake levels for a high seismic zone. For the archetype building, three-dimensional finite element models at different modeling fidelity levels were created using OpenSees. The models are subjected to IDA using the far-field ground motion records prescribed in Federal Emergency Management Agency (FEMA) P695. Seismic performance quantification following the FEMA P695 procedure shows that if the modeling fidelity only follows the state-of-the-practice, ie, only includes shear walls, unsafe collapse margin ratios are predicted. State-of-the-art models that account for participation from CFS gravity walls and architectural sheathing have overall performance that are consistent with testing, and IDA results indicate acceptable collapse margin ratios, predicated primarily on large system overstrength. Neglecting the lateral force resistance of the gravity system and nonstructural components, as done in current design, renders a safe design in the studied archetype, but largely divorced from actual system behavior. The modeling protocols established here provide a means to analyze a future suite of CFS-framed archetype buildings for developing further insight on the seismic response modification coefficients for CFS-framed buildings. 相似文献