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赤桉人工种子的研制 Ⅰ.幼芽繁殖体的高频率诱导及同步性控制 被引量:3
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作者 谷瑞升 陈正华 +1 位作者 姚渝光 刘桂珍 《林业科学》 CAS CSCD 北大核心 1996年第4期311-316,T001,共7页
系统地研究了诱导高频、同步可制成“芽珠”的赤桉幼芽(Shoottips)的方法,为以幼芽为繁殖体制备人工种子奠定基础。试验结果:首先,培养基中适宜的BA和NAA浓度和配比直接控制着制备“芽珠”型幼芽的数量,同时对已分... 系统地研究了诱导高频、同步可制成“芽珠”的赤桉幼芽(Shoottips)的方法,为以幼芽为繁殖体制备人工种子奠定基础。试验结果:首先,培养基中适宜的BA和NAA浓度和配比直接控制着制备“芽珠”型幼芽的数量,同时对已分化出的幼芽进一步伸长有很大的影响,BA为1.0mg/L,NAA为0.5mg/L的培养基中附加40mg/L腺嘌呤和5%的蔗糖能较好地控制幼芽生长及其叶片大小;其次,培养过程中先以16天光/暗为10h/14h培养之后转入4天全黑暗培养可控制幼芽生长的同步性,在半固体培养基上连续继代三次,获得了每次继代(20天)平均产生25个/cm2适宜制备“芽珠”的幼芽。文中就赤桉培养中褐色渗出物问题进行了初步研究,通过预培养的方法克服了褐变物对培养中材料的影响。 展开更多
关键词 赤桉 幼芽 高频率诱导 同步性控制
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Hopfield神经网络的同步性控制
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作者 李蕾 《哈尔滨商业大学学报(自然科学版)》 CAS 2023年第4期441-445,512,共6页
通过设计一类自适应控制器和牵引控制器,研究了具有外部扰动的Hopfield神经网络的同步性问题.利用李雅普诺夫稳定性理论、LaSalle不变准则和一些分析技术,结合自适应控制和牵引脉冲控制,得到了能使动态网络的整个状态同步到某一状态的准... 通过设计一类自适应控制器和牵引控制器,研究了具有外部扰动的Hopfield神经网络的同步性问题.利用李雅普诺夫稳定性理论、LaSalle不变准则和一些分析技术,结合自适应控制和牵引脉冲控制,得到了能使动态网络的整个状态同步到某一状态的准则.通过数值例子验证了方法的有效性. 展开更多
关键词 HOPFIELD神经网络 自适应控制同步 牵引控制同步 李雅普诺夫稳定 LaSalle不变准则 脉冲
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济钢双边剪夹送辊的同步性控制系统与应用 被引量:4
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作者 孙清泉 孙德宏 郭靖 《轧钢》 2002年第5期46-47,共2页
介绍了济南钢铁集团总公司中厚板厂双边剪基础自动化的系统配置和夹送辊的机械和电气同步性控制系统;采用该系统后,8台夹送辊速度一致,步长稳定,钢板的剪切效果较好。
关键词 同步性控制系统 中厚板 双边剪 夹送辊
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时滞非线性复杂动态网络的牵引自适应控制同步性 被引量:1
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作者 李蕾 《廊坊师范学院学报(自然科学版)》 2021年第2期60-63,共4页
研究非线性复杂动态网络的牵引自适应同步问题。通过使用李雅普诺夫方法、数学分析方法以及脉冲系统的比较原理,给出了非线性复杂动态网络同步的充分条件。最后用数值例子说明所设计控制器的有效性。
关键词 自适应同步 牵引控制同步 非线复杂网络 时变延迟
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红外凝视成像系统中的微扫描器控制 被引量:1
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作者 杨登全 姜炜波 +4 位作者 黄江平 姬玉龙 赵薇薇 王羽 程有度 《红外技术》 CSCD 北大核心 2014年第7期556-561,共6页
基于压电陶瓷驱动器,选用2×2微扫描模式,降低了系统控制难度。分析了影响微扫描器控制的几个因素,设计了一款以单片机为核心的控制电路,解决了微扫描器位移与同步的控制问题,并以此构建了一款基于国内某制冷型探测器的反射式微扫... 基于压电陶瓷驱动器,选用2×2微扫描模式,降低了系统控制难度。分析了影响微扫描器控制的几个因素,设计了一款以单片机为核心的控制电路,解决了微扫描器位移与同步的控制问题,并以此构建了一款基于国内某制冷型探测器的反射式微扫描热像仪,通过实验验证了采用2×2微扫描模式能够有效提升热像系统的空间分辨力。 展开更多
关键词 微扫描器 同步性控制 位移量控制 热像仪
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钢柱式整体爬升钢平台模架同步提升技术研究
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作者 秦鹏飞 《建筑施工》 2020年第7期1208-1211,共4页
多机位同步提升控制是钢柱式整体爬升钢平台模架关键技术之一。以南京金鹰T2塔楼核心筒竖向结构施工为例,从机位实测位移和顶升力数据出发,探寻影响同步性提升控制关键因素,提出进一步提升同步性控制水平的方法,为钢柱式整体爬升钢平台... 多机位同步提升控制是钢柱式整体爬升钢平台模架关键技术之一。以南京金鹰T2塔楼核心筒竖向结构施工为例,从机位实测位移和顶升力数据出发,探寻影响同步性提升控制关键因素,提出进一步提升同步性控制水平的方法,为钢柱式整体爬升钢平台模架的安全使用和推广提供理论支撑。 展开更多
关键词 钢平台模架 液压缸 液压系统 同步性控制水平
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苏通大桥5800t钢吊箱整体沉放技术 被引量:3
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作者 张雄文 任回兴 《中国工程科学》 2010年第2期22-26,51,共6页
苏通大桥是我国在长江河口地区建设的世界首座跨径超千米的斜拉桥,主塔基础位于深水潮汐急流河段,采用钻孔灌注桩群桩基础,是规模最大的群桩基础。对于深水急流条件下的群桩基础,为承台提供施工条件的钢吊箱的高精度施工是一个关键难题... 苏通大桥是我国在长江河口地区建设的世界首座跨径超千米的斜拉桥,主塔基础位于深水潮汐急流河段,采用钻孔灌注桩群桩基础,是规模最大的群桩基础。对于深水急流条件下的群桩基础,为承台提供施工条件的钢吊箱的高精度施工是一个关键难题。从沉放方案选择、结构方案设计、制作和安装、整体沉放工艺、同步性控制及定位等方面阐述了苏通大桥主塔基础5 800 t钢吊箱的整体沉放技术与工艺。其中,将钻孔桩施工平台与钢吊箱底板结合的结构方案和钢吊箱整体沉放工艺、同步性控制和定位技术具有明显的创新性。 展开更多
关键词 苏通大桥 大型钢吊箱 制作与安装 整体沉放 同步性控制
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港珠澳大桥超长大节段钢箱梁双船抬吊施工技术 被引量:5
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作者 朱武华 史虎彬 《中国港湾建设》 2017年第9期78-80,共3页
通过港珠澳大桥超长大节段钢箱梁的抬吊施工,总结了一套完整的施工工艺,包括抬吊吊具研究、同步性研究,数据偏差控制,各阶段控制要点等。通过良好的现场施工质量控制与施工管理,取得了抬吊施工的成功,这是国内首次采用浮吊完成近海超长... 通过港珠澳大桥超长大节段钢箱梁的抬吊施工,总结了一套完整的施工工艺,包括抬吊吊具研究、同步性研究,数据偏差控制,各阶段控制要点等。通过良好的现场施工质量控制与施工管理,取得了抬吊施工的成功,这是国内首次采用浮吊完成近海超长大节段的钢箱梁安装,为以后长节段钢箱梁抬吊安装施工提供了宝贵的经验积累和数据支持。 展开更多
关键词 钢箱梁 双浮吊抬吊 吊具 同步性控制
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BACKSTEPPING-BASED ADAPTIVE CONTROL AND SYNCHRONIZATION OF CHAOTIC SYSTEMS
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作者 樊春霞 姜长生 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2003年第2期196-200,共5页
Backstepping method is applied to the problems of synchronization for chaotic systems. Synchronization controller is designed via selecting a series of Lyapunov functions on the basis of recursive idea. The method is ... Backstepping method is applied to the problems of synchronization for chaotic systems. Synchronization controller is designed via selecting a series of Lyapunov functions on the basis of recursive idea. The method is systematic and can deal with a class of chaotic system′s synchronization problems, which are important in safe communication with chaotic signal. Due to the nature of backstepping method, the designed controller possesses perfect robustness and adaptation. As an example, the controller based on backstepping method is employed to synchronize Lorenz system. The numerical simulation illustrates that the method is effective. Compared with the linear feedback synchronization controller, the control law can stabilize synchronization systems at a smaller synchronization error. Therefore the controller has a good performance. 展开更多
关键词 chaos synchronization Backstepping method adaptive control
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Function Projective Synchronization of Two Identical New Hyperchaotic Systems 被引量:7
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作者 LI Xin 《Communications in Theoretical Physics》 SCIE CAS CSCD 2007年第5X期864-870,共7页
A function projective synchronization of two identical hyperchaotic systems is defined and the theorem of sufficient condition is given. Based on the active control method and symbolic computation Maple, the scheme of... A function projective synchronization of two identical hyperchaotic systems is defined and the theorem of sufficient condition is given. Based on the active control method and symbolic computation Maple, the scheme of function projective synchronization is developed to synchronize the two identical new hyperchaotic systems constructed by Yan up to a scaling function matrix with different initial values. Numerical simulations are used to verify the effectiveness of the scheme. 展开更多
关键词 function projective synchronization active control method hyperchaotic Chen system
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Synchronization of Modified Chua's Circuit with x|x| Function 被引量:1
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作者 TANG Fang WANG Ling 《Communications in Theoretical Physics》 SCIE CAS CSCD 2005年第2X期303-306,共4页
This paper considers the chaos synchronization of the modified Chua 's circuit with x|x| function. We firstly show that a couple of the modified Chua systems with different parameters and initial conditions can be... This paper considers the chaos synchronization of the modified Chua 's circuit with x|x| function. We firstly show that a couple of the modified Chua systems with different parameters and initial conditions can be synchronized using active control when the values of parameters both in drive system and response system are known aforehand.Furthermore, based on Lyapunov stability theory we propose an adaptive active control approach to make the states of two identical Chua systems with unknown constant parameters asymptotically synchronized. Moreover the designed controller is independent of those unknown parameters. Numerical simulations are given to validate the proposed synchronization approach. 展开更多
关键词 chaos synchronization modified Chua's circuit active control adaptive active control
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Global Exponential Projective Synchronization and Lag Synchronization of Hyperchaotic Lü System 被引量:2
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作者 ZHANG Qun-Jiao LU Jun-An JIA Zhen 《Communications in Theoretical Physics》 SCIE CAS CSCD 2009年第4期679-683,共5页
This paper investigates the projective synchronization and lag synchronization of a new hyperchaotic system[Physica A 364(2006)103].On the basis of Lyapunov stability theory,two novel nonlinear controllers are respect... This paper investigates the projective synchronization and lag synchronization of a new hyperchaotic system[Physica A 364(2006)103].On the basis of Lyapunov stability theory,two novel nonlinear controllers are respectivelydesigned to guarantee the global exponential projective synchronization(including complete synchronization and anti-synchronization)and lag synchronization.Finally,numerical simulations are given to show the effectiveness of the mainresults. 展开更多
关键词 hyperchaotic system projective synchronization lag synchronization EXPONENTIAL
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N-PD cross-coupling synchronization control based on adjacent coupling error analysis 被引量:4
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作者 刘延杰 梁乐 +1 位作者 储婷婷 吴明月 《Journal of Central South University》 SCIE EI CAS CSCD 2018年第5期1154-1164,共11页
In order to improve the trajectory tracking precision and reduce the synchronization error of a 6-DOF lightweight robot, nonlinear proportion-deviation (N-PD) cross-coupling synchronization control strategy based on... In order to improve the trajectory tracking precision and reduce the synchronization error of a 6-DOF lightweight robot, nonlinear proportion-deviation (N-PD) cross-coupling synchronization control strategy based on adjacent coupling error analysis is presented. The mathematical models of the robot, including kinematic model, dynamic model and spline trajectory planing, are established and verified. Since it is difficult to describe the real-time contour error of the robot for complex trajectory, the adjacent coupling error is analyzed to solve the problem. Combined with nonlinear control and coupling performance of the robot, N-PD cross-coupling synchronization controller is designed and validated by simulation analysis. A servo control experimental system which mainly consists of laser tracking system, the robot mechanical system and EtherCAT based servo control system is constructed. The synchronization error is significantly decreased and the maximum trajectory error is reduced from 0.33 mm to 0.1 mm. The effectiveness of the control algorithm is validated by the experimental results, thus the control strategy can improve the robot's trajectory tracking precision significantly. 展开更多
关键词 mathematical model of robot adjacent coupling error nonlinear PD control synchronization control trajectory tracking accuracy
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液压自动爬模技术的应用 被引量:4
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作者 韩爽 琚存国 《黑龙江科技信息》 2009年第32期323-323,共1页
液压自动爬模工艺是总结了滑升模板、大模板施工的优点后创造性的发挥了自身的工艺与操作优势。爬模是利用附着作已浇筑成型好的建筑结构上的爬升机构与爬升装置随建筑结构逐层升高施工的一种模板工艺。在高层建筑施工中,具有施工速度... 液压自动爬模工艺是总结了滑升模板、大模板施工的优点后创造性的发挥了自身的工艺与操作优势。爬模是利用附着作已浇筑成型好的建筑结构上的爬升机构与爬升装置随建筑结构逐层升高施工的一种模板工艺。在高层建筑施工中,具有施工速度快、操作简洁、工程质量好、降低成本的特点。爬模是适用于高层建筑或高耸构造物现浇钢筋混凝土结构的先进模板施工工艺。 展开更多
关键词 高层 筒体 同步与垂直度控制
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高层建筑筒体液压自动爬模施工技术 被引量:3
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作者 黄劲松 唐鹏 杨选奎 《中外建筑》 2008年第10期149-151,共3页
液压自动爬模工艺在高层建筑施工中,具有施工速度快、操作简洁、工程质量好、降低成本的特点。它的工艺是总结了滑升模板、大模板施工的优点后创造性的发挥了自身的工艺与操作优势。我国在80年代后期才开始将液压自动爬模工艺在高层建... 液压自动爬模工艺在高层建筑施工中,具有施工速度快、操作简洁、工程质量好、降低成本的特点。它的工艺是总结了滑升模板、大模板施工的优点后创造性的发挥了自身的工艺与操作优势。我国在80年代后期才开始将液压自动爬模工艺在高层建筑中进行使用,常规做法为筒体剪力墙外墙采用爬模,内墙采用散装钢模或组合钢模,且在混凝土—型钢结构中更为常见。 展开更多
关键词 高层 筒体 同步与垂直度控制
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Adaptive synchronization of a class of chaotic systems via variable structure control
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作者 Li Huiguang Zhang Xinying Guan Xinping 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2005年第4期858-861,865,共5页
The synchronization problem under two cases is considered. One is that the bound on the uncertainty existing in the controller is known, the other is that the bound is unknown. In the latter case, the simple adaptatio... The synchronization problem under two cases is considered. One is that the bound on the uncertainty existing in the controller is known, the other is that the bound is unknown. In the latter case, the simple adaptation laws for upper bound on the norm of the uncertainty is proposed. Using this adaptive upper bound, a variable structure control is designed. The proposed method does not guarantee the convergence of the adaptive upper bound to the real one but makes the system asymptotically stable. 展开更多
关键词 chaotic synchronization UNCERTAINTY variable structure control.
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绿色节能建筑施工技术与其优化分析 被引量:4
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作者 杜伟晟 《中国建设信息》 2012年第15期104-105,共2页
作者结合多年工作实践,针对绿色节能建筑施工技术中节能与能源利用技术进行探索,通过对节能施工技术措施的深入分析和现实应用,实现绿色施工中节约能源,降低能耗,高效利用资源的目标。液压自动爬模工艺是总结了滑升模板、大模板施工的... 作者结合多年工作实践,针对绿色节能建筑施工技术中节能与能源利用技术进行探索,通过对节能施工技术措施的深入分析和现实应用,实现绿色施工中节约能源,降低能耗,高效利用资源的目标。液压自动爬模工艺是总结了滑升模板、大模板施工的优点后创造性的发挥了自身的工艺与操作优势。 展开更多
关键词 建筑施工 降低能耗 技术要点 筒体 同步与垂直度控制
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Chaos Synchronization of Nonlinear Bloch Equations Based on Input-to-State Stable Control
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作者 Choon Ki Ahn 《Communications in Theoretical Physics》 SCIE CAS CSCD 2010年第2期308-312,共5页
In this paper, we propose a new input-to-state stable (ISS) synchronization method for chaotic behavior in nonlinear Bloch equations with external disturbance. Based on Lyapunov theory and linear matrix inequality ... In this paper, we propose a new input-to-state stable (ISS) synchronization method for chaotic behavior in nonlinear Bloch equations with external disturbance. Based on Lyapunov theory and linear matrix inequality (LMI) approach, for the first time, the ISS synchronization controller is presented to not only guarantee the asymptotic synchronization but also achieve the bounded synchronization error for any bounded disturbance. The proposed controller can be obtained by solving a convex optimization problem represented by the LMI. Simulation study is presented to demonstrate the effectiveness of the proposed synchronization scheme. 展开更多
关键词 chaos synchronization input-to-state stable (ISS) control nonlinear Bloch equations linear matrix inequality (LMI) Lyapunov theory
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Load Sharing Performance of the Main Drive System in the Shield Machine and Improvement of Control Method 被引量:1
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作者 Ran Liu Weidong Li +1 位作者 Jianzhong Sun Zhengchang Jiao 《Journal of Mechanics Engineering and Automation》 2012年第9期563-567,共5页
Shield machine is the major technical equipment badly in need in national infrastructure construction. The service conditions of shield machine are extremely complex. The driving interface load fluctuation caused by g... Shield machine is the major technical equipment badly in need in national infrastructure construction. The service conditions of shield machine are extremely complex. The driving interface load fluctuation caused by geological environment changes and multi field coupling of stress field may lead into imbalance of redundant drive motors output torque in main driving system. Therefore, the shield machine driving synchronous control is one of the key technologies of shield machine. This paper is in view of the shield machine main driving synchronous control, achieving the system's adaptive load sharing. From the point of view of cutterhead load changes, nonlinear factors of mechanical transmission mechanism and the control system synchronization performance, the authors analyze the load sharing performance of shield machine main drive system in the event of load mutation. The paper proposes a data-driven synchronized control method applicable to the main drive system. The effectiveness of the method is verified through simulation and experimental methods. The new method can make the system synchronization error greatly reduced, thus it can effectively adapt to load mutation, and reduce shaft broken accident. 展开更多
关键词 Shield machine cutterhead load sharing MULTI-MOTOR synchronized control.
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A General Approach for Synchronization of Chaotic Systems with Parameters Perturbation
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作者 LONGMin QIUShui-Sheng PENGFei 《Communications in Theoretical Physics》 SCIE CAS CSCD 2005年第3期455-458,共4页
By making use of the theory of stability for dynamical systems, a general approach for synchronization of chaotic systems with parameters perturbation is presented, and a general method for determining control functio... By making use of the theory of stability for dynamical systems, a general approach for synchronization of chaotic systems with parameters perturbation is presented, and a general method for determining control function is introduced. The Rossler system is employed to verify the effectiveness of the method, and the theoretical results are confirmed by simulations. 展开更多
关键词 CHAOS SYNCHRONIZATION parameters perturbation
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