共查询到19条相似文献，搜索用时 156 毫秒
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多自由度主动变刚度控制体系的振型控制 总被引：7，自引：1，他引：6
本文利用振型变换技术,将设置了ｍ个控制器的ｂ自由度主动变刚度控制体系降阶为１个自由度的主动变刚度控制体系,进而提出了振型控制律－包括第一振型控制律和主振型控制律,仿真分析结果表明,第一振型控制律可以有效地控制受控结构的相对位移反应,主振型控制律则可以有效地控制受控结构的相对位移反应和层间位移反应。 相似文献
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基于能量方程的建筑结构半主动控制 总被引：4，自引：2，他引：2
基于地震作用下结构的能量响应方程,本文提出根据结构吸收能量、相对动能和变形能的变化(对时间的一次导数)进行结构的“开-关”半主动减震的控制律;在物理坐标系中对这3种控制律的动力特征和控制效果,以及作动器参数的选取进行了分析。本文针对建筑结构进行了数值仿真。计算结果表明,本文提出的控制律可以有效地减小了结构的位移响应,对随机不确定的地震波均具有良好的减震效果,适应性强,而且控制器参数合理。其中根据结构变形能推导的控制律的半主动控制效果优于其它2种控制律。 相似文献
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随机动力系统最优控制准则研究 总被引：2，自引：0，他引：2
根据线性二次最优控制理论,给出了系统随机最优控制的控制律一般形式。从目标控制量的物理意义出发,提出了基于系统概率密度演化分析的最优控制准则,建立了递阶层次的演化过程控制准则类。以线性单自由度体系随机地震反应最优控制为例,分析了各控制准则类的权矩阵参数优化结果,并根据最优控制律进行了系统随机最优控制研究。结果表明,本文提出的系统随机最优控制的控制律确定方法可以对系统性态进行有效的控制。 相似文献
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主动变刚度／阻尼控制算法研究 总被引：10，自引：2，他引：8
建立了主动变刚度／阻尼控制系统的理论模型;基于瞬时最优控制算法推导了ＡＶＳＤ系统的开关控制律,并从控制结构的层间位移出发提出了一种直接根据结构动力反应符号确定的开关控制律。 相似文献
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结构可变阻尼半主动控制 总被引：12，自引：4，他引：12
本文阐述了结构半主动控制的概念，并介绍了国内外有关结构半主动控制的研究状态，阐述了几种有关结构半主动控制的算法，包括基于经典最优控制的控制律及算法，基于变结构系统理论的滑动模太控制算法和非线性奇次系统的ｂａｎｇ－ｂａｎｇ控制算法。重点阐述了变结构系统理论和滑移面的确定及控制律的设计。 相似文献
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设计出一种新型主动变刚度阻尼装置,该装置可向受控结构提供两种等效刚度,使受控结构能主动地避开地震动卓越频率而永远处于非共振的状态。基于变结构控制理论的滑动模态控制算法,推导了该新型阻尼器的两种开关控制律。仿真分析结果表明,这种新型主动变刚度阻尼器的减震效果是非常明显的,可取得明显优于被动控制的减震效果。两种控制律中,连续型滑动模态控制律可以更充分地发挥该新型阻尼器的性能,取得更好的控制效果。 相似文献
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地震作用下结构振型组合自校正控制 总被引：1，自引：1，他引：1
本文提出了结构振型组合的自校正控制方法,这使文献〔1〕提出的自校正控制方法可以应用于实际工程结构控制中,为结构的抗震控制提供了简便可行的控制律计算方法。 相似文献
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多结构混合控制体系研究 总被引：9，自引：0，他引：9
本文提出了多结构混合控制体系的概念及其相应的混合控制装置－常阻尼变刚度控制装置,阐明了其控制原理,建立了两结构混合控制体系的状态方程,其于瞬时最优控制的概念,提出了多结构混合控制体系的控制律,某两结构混合控制体系的仿真分析表明,多结构混合控制体系的概念是正确的,相应的混合控制装置是有效的。 相似文献
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《地震工程与工程振动》2017,(4)
针对模型参数不确定的结构振动控制问题提出一种自适应保性能PID鲁棒控制(LMIAGCPID)算法。首先,结合传统PID控制理论建立了考虑模型参数不确定性的受控结构扩阶状态方程,同时利用线性矩阵不等式方法,推导了保证系统渐进稳定和性能上界最小的保性能PID控制律,并引入约束条件,将其转化为凸优化求解问题;在此基础上,通过设置能够时变调节比例增益、微分增益和积分增益的自适应函数,进而得到自适应保性能PID鲁棒控制律。最后,对一个3层结构进行仿真分析。结果表明,不同地震激励下,无论结构参数是否存在不确定,LMI-AGCPID控制较LQG控制而言均能更好地抑制结构的振动响应。 相似文献
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Recently, several hybrid protective systems have been explored for applications to seismic-excited bridge structures. In particular, two types of aseismic hybrid protective systems have been shown to be quite effective: (i) rubber bearings and variable dampers (or actuators), and (ii) sliding bearings and actuators. In this paper, control methods are presented for these hybrid protective systems. The control methods are based on the theory of variable structure system (VSS) or sliding mode control (SMC). Emphasis is placed on the static (direct) output feedback controllers using only the information measured from a few sensors without an observer. Simulation results demonstrate that the control methods presented are robust with respect to system parametric uncertainties and the performance is quite remarkable. Sensitivity studies are conducted to evaluate the effectiveness of hybrid protective systems and passive sliding isolators for reducing the response of seismic-excited bridge structures. The advantages of each protective system are demonstrated by simulation results for a wide range of earthquake intensities. 相似文献
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Structural vibration control using active or passive control strategy is a viable technology for enhancing structural functionality and safety against natural hazards such as strong earthquakes and high wind gusts. Both the active and passive control systems have their limitations. The passive control system has limited capability to control the structural response whereas the active control system depends on external power. The power requirement for active control of civil engineering structures is usually quite high. Thus, a hybrid control system is a viable solution to alleviate some of the limitations. In this paper a multi‐objective optimal design of a hybrid control system for seismically excited building structures has been proposed. A tuned mass damper (TMD) and an active mass driver (AMD) have been used as the passive and active control components of the hybrid control system, respectively. A fuzzy logic controller (FLC) has been used to drive the AMD as the FLC has inherent robustness and ability to handle the non‐linearities and uncertainties. The genetic algorithm has been used for the optimization of the control system. Peak acceleration and displacement responses non‐dimensionalized with respect to the uncontrolled peak acceleration and displacement responses, respectively, have been used as the two objectives of the multi‐objective optimization problem. The proposed design approach for an optimum hybrid mass damper (HMD) system, driven by FLC has been demonstrated with the help of a numerical example. It is shown that the optimum values of the design parameters of the hybrid control system can be determined without specifying the modes to be controlled. The proposed FLC driven HMD has been found to be very effective for vibration control of seismically excited buildings in comparison with the available results for the same example structure but with a different optimal absorber. Copyright © 2002 John Wiley & Sons, Ltd. 相似文献
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大底盘多塔楼结构的混合隔震控制 总被引：2，自引：0，他引：2
结合某实际工程,针对大底盘多塔楼结构提出混合隔震的控制策略,即对大底盘上的一栋或多栋塔楼采用隔震技术,并在隔震层附设一定数量的被动、主动或半主动的减震控制装置。建立了这种大底盘多塔楼结构混合隔震控制体系的运动方程,方程中各塔楼与下部结构及隔震层之间的刚度解耦,并考虑了隔震层的非线性。研究中比较了被动非线性粘滞阻尼器,半主动变孔隙阻尼器与理想主动控制时的减震控制效果。结果表明,这种混合隔震体系可以有效地减小上部塔楼与下部结构的地震反应,提高大底盘多塔楼结构的抗震安全性,取得明显的经济和社会效益。半主动变孔隙阻尼器可以极好地追踪理想主动控制力,取得与理想主动控制相近的减震控制效果。被动非线性粘滞阻尼器也能取得较好的减震效果,且易于维护,经济性较好,从工程应用的角度来看更为现实可行,具有较好的应用推广价值。 相似文献
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In this paper, a new hybrid control technique, based on a combination of base-isolation and semi-active variable stiffness/damping in a superstructure, is presented. To illustrate the efficiency of the proposed control system, model tests on a mini-electromagnetic shaking table and a numerical simulation were performed. The test and numerical calculation results indicate that this new hybrid control mode with additional damping and smaller additional stiffness can achieve a better control efficiency. 相似文献
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地震作用下参数不确定系统的变结构控制 总被引：5，自引：2，他引：3
本文对结构参数具有有确定性的变结构控制系统设计方法进行了研究。首先采用摄动方法给出了结构参数具有确定性的控制系统的运动方程,证明了基于层间剪切模型的参数不确定受控系统与其标称系统具有相同的滑动模态,从而解决了系统切换函数的确定问题,并利用到达条件推导了控制律的表示式。算例分析结果表明,本文的控制方法能有效地减小结构的地震响应,对于结构系统建模存在误差或系统本身存在学确定性的情况,控制效果仍十分显著 相似文献
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A reliability‐based output feedback control methodology is presented for controlling the dynamic response of systems that are represented by linear state‐space models. The design criterion is based on a robust failure probability for the system. This criterion provides robustness for the controlled system by considering a probability distribution over a set of possible system models with a stochastic model of the excitation so that robust performance is expected. The control command signal can be calculated using incomplete response measurements at previous time steps without requiring state estimation. Examples of robust structural control using an active mass driver on a shear building model and on a benchmark structure are presented to illustrate the proposed method. Copyright © 2003 John Wiley & Sons, Ltd. 相似文献
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巨型框筒部分悬挂结构控制体系地震反应特性及阻尼控制研究 总被引：8，自引：2，他引：8
本文提出巨型框筒部分悬挂结构新体系，研究这种结构体系对地震反应特性，提出用阻尼器进行巨型框筒部分悬挂体系地震反应的控制方法，采用结构动力学有限元方法，建立空间分析模型，对结构体系进行地震随机振动分析、时程分析和地震反应谱分析。分析结果表明，这种结构体系能有效地减小结构的地震响应，最后研究了影响控制效果的主要因素及控制器参数的影响规律。 相似文献
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Generally, the active structural control system belongs to the discrete‐time control system, and the sampling period is one of the most important factors that would directly affect the performance of the control system. In this paper, active control approaches by using the discrete‐time variable structure control theory are studied for reducing the dynamic responses of seismically excited building structures. Based on the discrete reaching law method, a feedback controller which includes the sampling period is presented. The controller is extended by introducing the saturated control method to avoid the adverse effect when the actuators are saturated due to unexpected extreme earthquakes. The simulation results are obtained for a single‐degree‐of‐freedom (SDOF) system and a MDOF shear building equipped with active brace system (ABS) under seismic excitations. It is found that the discrete variable structure control approach and its saturated control method presented in this paper are quite effective. Copyright © 2001 John Wiley & Sons, Ltd. 相似文献
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A unified mathematical framework, sustained by experimental results, is presented for robust controller design taking into account the constraint on the control signal. The design procedure is exemplified for an active vibration suppression control problem with applications to flexible structures. The considered experimental set‐up is a three‐storey flexible structure with an active mass driver placed on the last storey. First, the considered flexible structure is identified and the model's parametric uncertainties are deduced. Next, control constraints are presented for the robust control design problem, taking into account the restriction imposed on the control signal. Finally, the effectiveness of the control system is tested through experiments, when the input disturbance is assumed to be a sinusoidal one as well as a historical earthquake record (1940 El Centro record). Copyright © 2003 John Wiley & Sons, Ltd. 相似文献