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1.
本文以一幢六层框架结构为研究对象,分析了土与结构相互作用效应对脉冲发生器和锚索两种控制系统的主动抗震控制效果的影响。结果表明:脉冲控制比锚索控制更为有效:在软土地基条件下,SSI效应有可能使结构主动锚索控制失效;与刚性地基假定的结果相比,SSI效应将显著降低脉冲控制所需的控制力,地基越软,降低的幅度越大,可达1/3 ̄1/2;若结构抗震设计时设及SSI效应的影响,则按刚性地基假定需设置的主动抗震控制  相似文献   

2.
土建结构振动控制研究进展   总被引:2,自引:0,他引:2  
介绍了结构控制研究的任务,主要的减振装置,结构的主动控制和被动控制,结构的开环和闭环控制及其相应的算法;对土建结构控制研究的进展进行了综述,并列举了土建结构振动控制工程应用实例;对土建控制研究的内容,研究方法和研究队伍等提出了建议。  相似文献   

3.
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   

4.
主动结构振动控制算法综述   总被引:8,自引:0,他引:8  
系统介绍了结构振动主动控制常用的七种算法,包手龙典线最优控制,极点地,时最优控制,狡模态控制,H∞状态反馈控制,滑动模态控制及最优多项式控制。  相似文献   

5.
本文将控制技术运用到拱型结构的振动控制中,运用单点和多点控制方法,将主动控制力表为位移,速度和加速度的线性函数,在频域内探讨了拱型结构某些关键部位加速度频率响应随地面运动频率变化情况,研究了主动控制参数对加速度响应的影响,并对带有主动控制装置的拱型结构在随机激励作用下的响应进行了分析,对拱型结构的振动控制给出了一些有益的看法。  相似文献   

6.
着重研究了变阻尼半主动控制在降低结构振动响应中的控制效果,在确定可变阻尼的阻尼系数时采用了控制效果较好的H∞优化控制策略,并将这种控制策略与传统控制方法进行了比较,通过数值分析比较了被动控制、主动控、半主动控制情况下结构的最大相对位移与结构的最大绝对加速度响应。并通过分析得出如下结论:(1)在被动、主动、半主动控制方法中主动控制的控制效果最好;(2)对于刚性结构,增大结构的附加阻尼可以同时降低结构的最大相对位移和最大绝对加速度响应,应用被动控制能取得较为理想的控制效果,而半主动控制的控制效果是值得怀疑的,在应用时应慎重考虑;(3)对于柔性结构,增大附加阻尼在降低结构的最大相对位移响应的同时,却增加了结构最大绝对加速度响应,而采用半主动控制能够同时降低结构的最大相对位移和绝对加速度响应,半主动控制效果明显;(4)在柔性结构中采用半主动控制方法能取得与主动控制相近的效果;(5)由于H∞优化控制是对最坏情况下瞬时能量的优化控制,因此H∞半主动控制的控制效果要优于传统LQR控制。  相似文献   

7.
中国结构控制的研究与应用   总被引:31,自引:6,他引:25  
建筑结构传统的设计方法是依靠结构自身的能力耗散振动能量,近十几年来,减小建筑结构在强烈地震地面运动和风荷载作用下的损失,越来越引起科学家和工程师的关注。结构振动控制的研究和应用已经取得了可喜的成果,迄今为止,许多振动控制的方法已经成功地应用于实际工程中,本文的目的是回顾中国振动控制在土木工程结构中的研究和应用情况。其中包括:基础隔震和被动控制技术,主动控制,混合控制和半主动控制以及国家自然科学基金  相似文献   

8.
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   

9.
土木工程结构最优控制问题的脉冲干扰法(PDM)   总被引:1,自引:0,他引:1  
此论文根据土木工程结构主动控制问题的特点提出了研究土木工程结构最优控制问题的一种新方法,即脉冲干扰法,其结果归结为定常线性结构的瞬时最成闭环控制。  相似文献   

10.
结构主动控制系统时间滞后测量与补偿方法   总被引:12,自引:0,他引:12  
本文研究了结构主动控制系统时间滞后产生的原因,利用作者建立的结构主动控制系统进行了系统时间滞后测量方法的研究,测量得到了该系统时间滞后的具体数值,在此基础上,研究了时间滞后对控制系统的影响,提出了结构主动控制系统时间滞后的三种补偿,即移相法,泰勒级数展开法和预估状态向量法,通过主动控制试验证了时间滞后补偿方法的有效性。  相似文献   

11.
压电材料智能控制器对框架结构地震反应的主动控制   总被引:14,自引:2,他引:12  
本文对压电材料智能控制器装置进行了介绍,并提出了压电材料智能控制器对框架结构地震反应基于现代最优控制理论的主动控制方法。计算实例分析结果表明:应用本方法,该智能控制装置能有效地减小结构的地震反应。  相似文献   

12.
This paper presents a statistical performance analysis of a semi‐active structural control system for suppressing the vibration response of building structures during strong seismic events. The proposed semi‐active mass damper device consists of a high‐frequency mass damper with large stiffness, and an actively controlled interaction element that connects the mass damper to the structure. Through actively modulating the operating states of the interaction elements according to pre‐specified control logic, vibrational energy in the structure is dissipated in the mass damper device and the vibration of the structure is thus suppressed. The control logic, categorized under active interaction control, is defined directly in physical space by minimizing the inter‐storey drift of the structure to the maximum extent. This semi‐active structural control approach has been shown to be effective in reducing the vibration response of building structures due to specific earthquake ground motions. To further evaluate the control performance, a Monte Carlo simulation of the seismic response of a three‐storey steel‐framed building model equipped with the proposed semi‐active mass damper device is performed based on a large ensemble of artificially generated earthquake ground motions. A procedure for generating code‐compatible artificial earthquake accelerograms is also briefly described. The results obtained clearly demonstrate the effectiveness of the proposed semi‐active mass damper device in controlling vibrations of building structures during large earthquakes. Copyright © 2003 John Wiley & Sons, Ltd.  相似文献   

13.
结构参数非匹配不确定性问题的滑动模态控制   总被引:1,自引:0,他引:1  
本文针对结构参数非匹配不确定性问题,采用简化滑动模态控制方法.即在滑动面的没计中忽略非匹配不确定性的影响,对一个顶层放置AMD系统的五层弹塑性建筑结构进行了主动控制数值分析.考虑了结构层屈服位移的不确定,数值模拟结果表明,简化方法具有很强的鲁棒性,结构参数相对于期望值的变化幅度为-40%至40%时.简化方法均有很好的控制效果。  相似文献   

14.
The spatial variability of input ground motion at supporting foundations plays a key role in the structural response of cable-stayed bridges (CSBs); therefore, spatial variation effects should be included in the analysis and design of effective vibration control systems. The control of CSBs represents a challenging and unique problem, with many complexities in modeling, control design and implementation, since the control system should be designed not only to mitigate the dynamic component of the structural response but also to counteract the effects of the pseudo-static component of the response. The spatial variability effects on the feasibility and efficiency of seismic control systems for the vibration control of CSBs are investigated in this paper. The assumption of uniform earthquake motion along the entire bridge may result in quantitative and qualitative differences in seismic response as compared with those produced by uniform motion at all supports. A systematic comparison of passive and active system performance in reducing the structural responses is performed, focusing on the effect of the spatially varying earthquake ground motion on the seismic response of a benchmark CSB model with different control strategies, and demonstrates the importance of accounting for the spatial variability of excitations.  相似文献   

15.
土木工程结构鲁棒控制的发展   总被引:1,自引:0,他引:1  
评述了结构控制的发展,指出发展结构鲁棒控制策略的重要性。重点评述了结构双重调谐质量阻尼器(DTMD)和多重双重调谐质量阻尼器(MDTMD)的控制策略,提出了需进一步发展主动双重调谐质量阻尼器(ADTMD)和主动多重双重调谐质量阻尼器(AMDTMD)控制策略、此外,评述了结构鲁棒控制的设计准则与高层建筑和大跨桥梁在风与地震作用下的统一自适应主动鲁棒控制策略。  相似文献   

16.
In this paper a predictive control method especially suitable for the control of semi‐active friction dampers is proposed. By keeping the adjustable slip force of a semi‐active friction damper slightly lower than the critical friction force, the method allows the damper to remain in its slip state throughout an earthquake of arbitrary intensity, so the energy dissipation capacity of the damper can be improved. The proposed method is formulated in a discrete‐time domain and cast in the form of direct output feedback for easy control implementation. The control algorithm is able to produce a continuous and smooth slip force for a friction damper and thus avoid exerting the high‐frequency structural response that usually exists in structures with conventional friction dampers. Using a numerical study, the control performance of a multiple degrees of freedom (DOF) structural system equipped with passive friction dampers and semi‐active dampers controlled by the proposed method are compared. The numerical case shows that by merely using a single semi‐active friction damper and a few sensors, the proposed method is able to achieve better acceleration reduction than the case using multiple passive dampers. Copyright © 2004 John Wiley & Sons, Ltd.  相似文献   

17.
提出了一种具有地震抑制功能的结构抗震主动控制算法。其特点是设计一组状态反馈控制律,使得闭环结构系统在具有希望极点的同时,还能够减小结构地震输人的影响。首先,在特征结构配置参数化方法的基础上,将该控制问题转化为一个含有约束条件的优化问题;其次,给出了求解该问题的算法及实施步骤,该方法直接基于结构系统原始矩阵,不涉及系统的增广或变换,便于工程应用;最后,对地震作用下三层剪切型Benchmark结构模型进行了仿真分析,结果表明本文所提具有地震干扰抑制功能算法的有效性。  相似文献   

18.
In this paper, the performance of active interaction control (AIC) algorithms is assessed within the context of two realistic building models. The AIC control approach is proposed as a semi‐active means of mitigating the structural response during large earthquakes. To implement the AIC control algorithms into MDOF systems, the modal control (MC) approach that directs the control effort to certain dominant response modes is formulated and utilized herein. Two structures, a 3‐storey building and a 9‐storey steel‐framed benchmark building controlled by the AIC algorithms are analysed for two historical earthquake records. The results of numerical simulation verify the efficacy of the AIC control algorithms in controlling vibration of building structures during large earthquakes. Copyright © 2001 John Wiley & Sons, Ltd.  相似文献   

19.
The seismic performance of a test structure fitted with semi‐active resetable devices is experimentally investigated. Shaking table tests are conducted on a ?th scale four‐storey building using 27 earthquake records at different intensity scalings. Different resetable device control laws result in unique hysteretic responses from the devices and thus the structure. This device adaptability enables manipulation or sculpting of the overall hysteresis response of the structure to address specific structural cases and types. The response metrics are presented as maximum 3rd floor acceleration and displacement, and the total base shear. The devices reduce all the response metrics compared with the uncontrolled case and a fail‐safe surrogate. Cumulative probability functions allow comparison between different control laws and additionally allow tradeoffs in design to be rapidly assessed. Ease of changing the control law in real‐time during an earthquake record further improves the adaptability of the system to obtain the optimum device response for the input motion and structural type. The findings are an important step to realizing full‐scale structural control with customized semi‐active hysteretic behaviour using these novel resetable device designs. Copyright © 2008 John Wiley & Sons, Ltd.  相似文献   

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