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Analysis and design of over-current limit control strategies applied in aeronautical power supplies 被引量:1
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作者 王林兵 何湘宁 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2007年第2期287-291,共5页
Some Over-Current Limit Control strategies are analyzed and designed to meet the demands of high reliability and rapid dynamic response in the aeronautical power supply applications. The control schemes are both effec... Some Over-Current Limit Control strategies are analyzed and designed to meet the demands of high reliability and rapid dynamic response in the aeronautical power supply applications. The control schemes are both effective in DC-DC converters and DC-AC converters. Controller models are set up, and the over-current limit operation principles of analogy and digital control are analyzed too. An 800VA aeronautical power supply bas been constructed to verify the performance of the proposed control strategy in various cases such as the sudden load change and the constant load. The analysis and experiments confirm the advantages of the proposed over-current limit strategies as follows: simple,effective and reliable. 展开更多
关键词 over-current limit control power converter aeronautical power supply
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PREDICTION AND CONTROL OF BOTH WRINKLE AND FRACTURE LIMITS ON CYLINDRICAL CUP MULTI DEEP DRAWING 被引量:2
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作者 Lei Junxiang Yantai UniversityKang Yonglin University of Science and Technology Beijing 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 1999年第4期288-296,共9页
Based on the superfluous triangle material wrinkle model,the no wrinkle limit criterion of cylindrical cup multi deep drawing is calculated as the prediction and control of the wrinkle limit.According to fracture m... Based on the superfluous triangle material wrinkle model,the no wrinkle limit criterion of cylindrical cup multi deep drawing is calculated as the prediction and control of the wrinkle limit.According to fracture model,the no fracture limit criterion of cylindrical cup multi deep drawing is calculated as the prediction and control of the fracture limit.Combining the no wrinkle limit criterion with the no fracture limit criterion,the no wrinkle and no fracture limit criterion and diagram on cylindrecal cup multi deep drawing are given as the prediction and control of both wrinkle and fracture limits.In accordance with this can determine the limit deep drawing coefficient and minimum deep drawing coefficient,and can choose the deep drawing coefficient of multi deep drawing,blank holder force and deformation force by optimization choice method.Theory calculation and test data are highly consistent,and suitable for no flange multi deep drawing,flange multi deep drawing and rigid punch expanding 展开更多
关键词 Cylindrical cup MULTI deep DRAWING Wrinkle limit Fracture limit control Optimization choice method
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Predictive Control Model Based on the MPC Algorithm on Three Different Road Sections
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作者 Xiaoxi Liu Xixi Zheng +1 位作者 Shuming Zhang Zhidong Wang 《Journal of Electronic Research and Application》 2024年第2期116-123,共8页
Predictive control is an advanced control algorithm,which is widely used in industrial process control.Among them,model predictive control(MPC)is an important branch of predictive control.Its basic principle is to use... Predictive control is an advanced control algorithm,which is widely used in industrial process control.Among them,model predictive control(MPC)is an important branch of predictive control.Its basic principle is to use the system model to predict future behavior and determine the current control action by optimizing the objective function.This paper discusses the application of MPC in the prediction and control of the speed of vehicles to optimize traffic flow.It is a valuable reference for alleviating traffic congestion and improving travel efficiency and smoothness and provides scientific basis and technical support for future highway traffic management. 展开更多
关键词 MPC algorithm Variable speed limit control HIGHWAY
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H-infinity performance optimization for networked control systems with limited communication channels 被引量:3
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作者 Yulong WANG Guanghong YANG 《控制理论与应用(英文版)》 EI 2010年第1期99-104,共6页
This paper studies the problems of H-infinity performance optimization and controller design for continuous-time NCSs with both sensor-to-controller and controller-to-actuator communication constraints (limited commu... This paper studies the problems of H-infinity performance optimization and controller design for continuous-time NCSs with both sensor-to-controller and controller-to-actuator communication constraints (limited communication channels). By taking the derivative character of network-induced delay into full consideration and defining new Lyapunov functions, linear matrix inequalities (LMIs)-based H-infinity performance optimization and controller design are presented for NCSs with limited communication channels. If there do not exist any constraints on the communication channels, the proposed design methods are also applicable. The merit of the proposed methods lies in their Jess conservativeness, which is achieved by avoiding the utilization of bounding inequalities for cross products of vectors. The simulation results illustrate the merit and effectiveness of the proposed H-infinity controller design for NCSs with limited communication channels. 展开更多
关键词 Networked control systems (NCSs) limited communication channels Performance optimization controller design
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Amplitude control of limit cycle in a van der Pol Duffing system 被引量:3
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作者 欧阳克俭 唐驾时 梁翠香 《Chinese Physics B》 SCIE EI CAS CSCD 2009年第11期4748-4753,共6页
This paper applies washout filter technology to amplitude control of limit cycles emerging from Hopf bifurcation of the van der Pol-Duffing system. The controlling parameters for the appearance of Hopf bifurcation are... This paper applies washout filter technology to amplitude control of limit cycles emerging from Hopf bifurcation of the van der Pol-Duffing system. The controlling parameters for the appearance of Hopf bifurcation are given by the Routh-Hurwitz criteria. Noticeably, numerical simulation indicates that the controllers control the amplitude of limit cycles not only of the weakly nonlinear van der Pol-Duffing system but also of the strongly nonlinear van der Pol-Duffing system. In particular, the emergence of Hopf bifurcation can be controlled by a suitable choice of controlling parameters. Gain-amplitude curves of controlled systems are also drawn. 展开更多
关键词 bifurcation control limit cycle Hopf bifurcation van der Pol-Duffing system
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Quantum speed limit time of a two-level atom under different quantum feedback control
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作者 余敏 方卯发 邹红梅 《Chinese Physics B》 SCIE EI CAS CSCD 2018年第1期253-257,共5页
We investigate the quantum speed limit time (QSLT) of a two-level atom under quantum-jump-based feedback control or homodyne-based feedback control. Our results show that the two different feedback control schemes h... We investigate the quantum speed limit time (QSLT) of a two-level atom under quantum-jump-based feedback control or homodyne-based feedback control. Our results show that the two different feedback control schemes have different influences on the evolutionary speed. By adjusting the feedback parameters, the quantum-jump-based feedback control can induce speedup of the atomic evolution from an excited state, but the homodyne-based feedback control cannot change the evolutionary speed. Additionally, the QSLT for the whole dynamical process is explored. Under the quantum-jump-based feedback control, the QSLT displays oscillatory behaviors, which implies multiple speed-up and speed-down processes during the evolution. While, the homodyne-based feedback control can accelerate the speed-up process and improve the uniform speed in the uniform evolution process. 展开更多
关键词 quantum speed limit time quantum feedback control SPEEDUP
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线粒体移植治疗肌少症的潜力
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作者 李伟 尹洪涛 +3 位作者 孙永晨 徐卫娟 孙金玲 金晓东 《中国组织工程研究》 CAS 北大核心 2025年第13期2842-2848,共7页
背景:肌少症是衰老引起的骨骼肌质量和力量下降的一种综合性疾病,是老年人面临的主要健康挑战。越来越多的证据表明,线粒体功能障碍在肌少症的发病机制中起着关键作用。目的:总结线粒体质量控制失调导致肌少症的机制,探讨线粒体移植可... 背景:肌少症是衰老引起的骨骼肌质量和力量下降的一种综合性疾病,是老年人面临的主要健康挑战。越来越多的证据表明,线粒体功能障碍在肌少症的发病机制中起着关键作用。目的:总结线粒体质量控制失调导致肌少症的机制,探讨线粒体移植可能是治疗肌少症的潜在靶点。方法:以“sarcopenia,mitochondrial dysfunction,mitochondrial quality control,mitochondrial transplantation,limitations”和“肌少症,线粒体功能障碍,线粒体质量控制,线粒体移植,局限性”为关键词,检索PubMed和CNKI数据库2009-2023年间相关文献。结果与结论:线粒体功能障碍在肌少症发病机制中发挥关键作用,线粒体移植可能通过改善线粒体生物能量学和调节线粒体相关信号通路成为治疗肌少症的可能策略。虽然部分临床前和临床研究证实线粒体移植治疗各种疾病的潜力,但关于线粒体转移的具体细节方面仍有一些亟待解决的问题。 展开更多
关键词 肌少症 线粒体功能障碍 线粒体质量控制 线粒体移植 局限性
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高管限薪方式与国有企业高质量发展
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作者 吴秋生 郑玥臻 《经济问题》 北大核心 2025年第1期70-78,共9页
2009年和2015年中华人民共和国人力资源和社会保障部和国务院国有资产监督管理委员会先后出台了国有企业高管限薪规定,采取了绝对限薪和相对限薪两种不同方式,因此,有必要明晰哪一种方式更有利于促进国有企业高质量发展。以2010—2023年... 2009年和2015年中华人民共和国人力资源和社会保障部和国务院国有资产监督管理委员会先后出台了国有企业高管限薪规定,采取了绝对限薪和相对限薪两种不同方式,因此,有必要明晰哪一种方式更有利于促进国有企业高质量发展。以2010—2023年的A股国有企业为样本进行研究,结果表明:与绝对限薪相比,相对限薪更能够促进国有企业高质量发展,且相对限薪程度越高、内部控制质量越高,上述关系越明显。进一步研究发现,相对限薪促进国有企业发展质量提高是通过降低盈余管理、提高创新效率等路径实现的,且这种作用路径在产品市场竞争度高的国有企业和实体国有企业中更明显。研究结论对合理制定和有效实施限薪政策及提高企业内部控制质量,促进国有企业高质量发展具有启示意义。 展开更多
关键词 绝对限薪 相对限薪 全要素生产率 内部控制质量
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基于Controller Link的力矩限制器设计
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作者 周奇才 曾礼 +1 位作者 陶元 李文军 《机电一体化》 2013年第6期58-62,共5页
力矩限制器在保证起重机安全可靠工作的过程中起到了非常重要的作用。介绍了一种新型环轨起重机中力矩限制器设计方法。该力矩限制器选用OMRON CJ1可编程控制器,利用分布式网络中的Controller Link总线进行数据的传输。作为控制系统中... 力矩限制器在保证起重机安全可靠工作的过程中起到了非常重要的作用。介绍了一种新型环轨起重机中力矩限制器设计方法。该力矩限制器选用OMRON CJ1可编程控制器,利用分布式网络中的Controller Link总线进行数据的传输。作为控制系统中的安全保护单元,该力矩限制器能有效地起到力矩限制的作用。 展开更多
关键词 力矩限制器 环轨起重机 controlLER LINK
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Application study of complex control algorithm for regenerative furnace temperature 被引量:3
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作者 LushengGE 《控制理论与应用(英文版)》 EI 2004年第2期205-207,共3页
Alternative switch combustion mode of air and gas is adopted on the two sides of the regenerative furnace, its temperature is in uncontrolled state in the switching process and the switch period is generally 3 ~ 5 mi... Alternative switch combustion mode of air and gas is adopted on the two sides of the regenerative furnace, its temperature is in uncontrolled state in the switching process and the switch period is generally 3 ~ 5 min. Thus, the conventional bi-cross limited combustion control method is no longer applicable to the object. This paper makes use of neutral network algorithm to adjust the static operating point. On this basis, fuzzy control strategy is used for the furnace temperature control. The actual application result shows that the control strategy is effective to solve the problem of the combustion control for regenerative furnace. 展开更多
关键词 Regenerative furnace Bi-cross limitation control Neural network
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Nonlinear aeroelastic analysis of a two-dimensional wing with control surface in supersonic flow 被引量:2
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作者 Guoyong Zheng 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2010年第3期401-407,共7页
Based on the piston theory of supersonic flow and the energy method, a two dimensional wing with a control surface in supersonic flow is theoretically modeled, in which the cubic stiffness in the torsional direction o... Based on the piston theory of supersonic flow and the energy method, a two dimensional wing with a control surface in supersonic flow is theoretically modeled, in which the cubic stiffness in the torsional direction of the control surface is considered. An approximate method of the cha- otic response analysis of the nonlinear aeroelastic system is studied, the main idea of which is that under the condi- tion of stable limit cycle flutter of the aeroelastic system, the vibrations in the plunging and pitching of the wing can approximately be considered to be simple harmonic excita- tion to the control surface. The motion of the control surface can approximately be modeled by a nonlinear oscillation of one-degree-of-freedom. The range of the chaotic response of the aeroelastic system is approximately determined by means of the chaotic response of the nonlinear oscillator. The rich dynamic behaviors of the control surface are represented as bifurcation diagrams, phase-plane portraits and PS diagrams. The theoretical analysis is verified by the numerical results. 展开更多
关键词 Piston theory Supersonic flow CHAOS control surface limit cycle flutter
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Stabilization and control of subcritical semilinear wave equation in bounded domain with Cauchy-Ventcel boundary conditions 被引量:1
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作者 A.Kanoune N.Mehidi 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2008年第6期787-800,共14页
We analyze the exponential decay property of solutions of the semilinear wave equation in bounded domain Ω of R^N with a damping term which is effective on the exterior of a ball and boundary conditions of the Cauchy... We analyze the exponential decay property of solutions of the semilinear wave equation in bounded domain Ω of R^N with a damping term which is effective on the exterior of a ball and boundary conditions of the Cauchy-Ventcel type. Under suitable and natural assumptions on the nonlinearity, we prove that the exponential decay holds locally uniformly for finite energy solutions provided the nonlinearity is subcritical at infinity. Subcriticality means, roughly speaking, that the nonlinearity grows at infinity at most as a power p 〈 5. The results obtained in R^3 and RN by B. Dehman, G. Lebeau and E. Zuazua on the inequalities of the classical energy (which estimate the total energy of solutions in terms of the energy localized in the exterior of a ball) and on Strichartz's estimates, allow us to give an application to the stabilization controllability of the semilinear wave equation in a bounded domain of R^N with a subcritical nonlinearity on the domain and its boundary, and conditions on the boundary of Cauchy-Ventcel type. 展开更多
关键词 STABILIZATION exact controllability limit problems SEMILINEAR subcritical partial differential equations Cauchy-Ventcel
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Seat inventory control methods for Chinese passenger railways 被引量:3
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作者 包云 刘军 +1 位作者 马敏书 孟令云 《Journal of Central South University》 SCIE EI CAS 2014年第4期1672-1682,共11页
Railway seat inventory control strategies play a crucial role in the growth of profit and train load factor. The railway passenger seat inventory control problem in China was addressed. Chinese passenger railway opera... Railway seat inventory control strategies play a crucial role in the growth of profit and train load factor. The railway passenger seat inventory control problem in China was addressed. Chinese passenger railway operation features and seat inventory control practice were analyzed firstly. A dynamic demand forecasting method was introduced to forecast the coming demand in a ticket booking period. By clustering, passengers' historical ticket bookings were used to forecast the demand to come in a ticket booking period with least squares support vector machine. Three seat inventory control methods: non-nested booking limits, nested booking limits and bid-price control, were modeled under a single-fare class. Different seat inventory control methods were compared with the same demand based on ticket booking data of Train T15 from Beijing West to Guangzhou. The result shows that the dynamic non-nested booking limits control method performs the best, which gives railway operators evidence to adjust the remaining capacity in a ticket booking period. 展开更多
关键词 seat inventory control Chinese passenger railway revenue management booking limits bid-price
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Effect of degree correlation on edge controllability of real networks
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作者 Shu-Lin Liu Shao-Peng Pang 《Chinese Physics B》 SCIE EI CAS CSCD 2020年第10期101-108,共8页
We use the controllability limit theory to study impact of correlation between in- and out-degrees (degree correlation) on edge controllability of real networks. Simulation results and analytic calculations show that ... We use the controllability limit theory to study impact of correlation between in- and out-degrees (degree correlation) on edge controllability of real networks. Simulation results and analytic calculations show that the degree correlation plays an important role in the edge controllability of real networks, especially dense real networks. The upper and lower controllability limits hold for all kinds of real networks. Any edge controllability in between the limits is achievable by properly adjusting the degree correlation. In addition, we find that the edge dynamics in some real networks with positive degree correlation may be difficult to control, and explain the rationality of this anomaly based on the controllability limit theory. 展开更多
关键词 complex network edge controllability degree correlation controllability limit
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Theory and Practice of Oxide Inclusion Composition and Morphology Control in Spring Steel Production 被引量:5
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作者 XUEZheng-liang LIZheng-bang +3 位作者 ZHANGJia-wen YANGWu GANChao-fu WANGYu 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2003年第2期38-44,共7页
In order to control the composition,morphology and size distribution of oxide inclusions in spring steel,the relationship between the content or activity of aluminum and calcium in molten steel and compositions of oxi... In order to control the composition,morphology and size distribution of oxide inclusions in spring steel,the relationship between the content or activity of aluminum and calcium in molten steel and compositions of oxide inclusion precipitated at different temperatures was determined based on thermodynamic equilibrium for spring steel 60Si2 MnA,and has been verified by practice.The size distribution of non-metallic inclusions electrolytically extracted from specimens of hot rolled spring steel was determined by image analyzer.The results show that there are a great deal of large inclusions in spring steel produced by the conventional process,and the quantity and the size of large inclusions in spring steel produced by new process are largely reduced.As a result,the fatigue properties of the spring steel produced by new process are highly improved,and the ratio ofσ-1/σbis raised from 0.451 to 0.468. 展开更多
关键词 spring steel oxide inclusion inclusion composition control inclusion morpholo-gy control fatigue limit strength
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Coordination of multiple mobile robots with limited communication range in pursuit of single mobile target in cluttered environment 被引量:1
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作者 Jianying ZHENG Haibin YU +2 位作者 Meng ZHENG Wei LIANG Peng ZENG 《控制理论与应用(英文版)》 EI 2010年第4期441-446,共6页
This paper addresses the problem of coordinating multiple mobile robots in searching for and capturing a mobile target,with the aim of reducing the capture time.Compared with the previous algorithms,we assume that the... This paper addresses the problem of coordinating multiple mobile robots in searching for and capturing a mobile target,with the aim of reducing the capture time.Compared with the previous algorithms,we assume that the target can be detected by any robot and captured successfully by two or more robots.In this paper,we assume that each robot has a limited communication range.We maintain the robots within a mobile network to guarantee the successful capture.In addition,the motion of the target is modeled and incorporated into directing the motion of the robots to reduce the capture time.A coordination algorithm considering both aspects is proposed.This algorithm can greatly reduce the expected time of capturing the mobile target.Finally,we validate the algorithm by the simulations and experiments. 展开更多
关键词 Multirobot system Distributed control Mobile network Probabilistic strategy limited communication range Target tracking Coordinated control
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Bootstrap-T Technique for Minimax Multivariate Control Chart
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作者 Johnson A. Adewara Kayode S. Adekeye 《Open Journal of Statistics》 2012年第5期469-473,共5页
Bootstrap methods are considered in the application of statistical process control because they can deal with unknown distributions and are easy to calculate using a personal computer. In this study we propose the use... Bootstrap methods are considered in the application of statistical process control because they can deal with unknown distributions and are easy to calculate using a personal computer. In this study we propose the use of bootstrap-t multivariate control technique on the minimax control chart. The technique takes care of correlated variables as well as the requirement of the distributional assumptions needed for the operation of the minimax control chart. The bootstrap-t technique provides the mean θB of all the bootstrap estimators ** where θi is the estimate using the ith bootstrap sample and B is the number of bootstraps. The computation of the proposed bootstrap-t minimax statistic was performed on the values obtained from the bootstrap estimation. This method was used to determine the position of the four control limits of the minimax control chart. The bootstrap-t approach introduced to minimax multivariate control chart helps to detect shifts in the mean vector of a multivariate process and it overcomes the computational complexity of obtaining the distribution of multivariate data. 展开更多
关键词 BOOTSTRAP MINIMAX MULTIVARIATE Data control limits PROCESS control
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A survey on delayed feedback control of chaos 被引量:3
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作者 Yuping TIAN Jiandong ZHU Guanrong CHEN 《控制理论与应用(英文版)》 EI 2005年第4期311-319,共9页
This paper introduces the basic idea and provides the mathematical formulation of the delayed feedback control (DFC) methodology, which has been widely used in chaos control. Stability analysis including the well-kn... This paper introduces the basic idea and provides the mathematical formulation of the delayed feedback control (DFC) methodology, which has been widely used in chaos control. Stability analysis including the well-known odd number linfitation of the DFC is reviewed. Some new developments in characterizing the limitation of the DFC are presented. Various modified DFC methods, which are developed in order to overcome the odd number limitation, are also described. Finally, some open problems in this research field are discussed. 展开更多
关键词 Delayed feedback control Chaos control STABILITY Odd number limitation STABILIZATION
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虚拟同步机电流受限暂态电压支撑机理与改进故障穿越控制研究 被引量:2
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作者 张宇 张琛 +2 位作者 蔡旭 余勇铮 梁李柳元 《中国电机工程学报》 EI CSCD 北大核心 2024年第15期5996-6009,I0013,共15页
针对虚拟同步机在电网低、过电压故障下所面临的无功电压支撑不足、特性差等问题,建立考虑电流限幅特性的虚拟同步机等效电路模型,并基于拓扑同伦原理,给出不同无功电压控制在等效电路相量图上的几何表征方法。利用该方法,揭示几种常见... 针对虚拟同步机在电网低、过电压故障下所面临的无功电压支撑不足、特性差等问题,建立考虑电流限幅特性的虚拟同步机等效电路模型,并基于拓扑同伦原理,给出不同无功电压控制在等效电路相量图上的几何表征方法。利用该方法,揭示几种常见无功电压控制下的虚拟同步机电流受限暂态电压支撑机理,并由此提出一种改进的故障穿越控制策略,有效改善电网低电压、过电压故障下的暂态电压控制能力和支撑特性,进而缓解故障期间的暂态功角稳定问题。基于PSCAD/EMTDC仿真对所提机理和故障穿越控制方法进行详细验证,最后,在3机9节点系统中对其在近、远区电网故障下的支撑特性进行仿真验证。 展开更多
关键词 并网变换器 构网型控制 故障穿越 电流限幅 电压支撑控制 暂态同步稳定性
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H_∞ Design for Sampled-Data Systems via Lifting Technique: Conditions and Limitation 被引量:5
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作者 WANG Guang-Xiong LIU Yan-Wen HE Zhen 《自动化学报》 EI CSCD 北大核心 2006年第5期791-795,共5页
The initial motivation of the lifting technique is to solve the H∞control problems. However, the conventional weighted H∞design does not meet the conditions required by lifting, so the result often leads to a misjud... The initial motivation of the lifting technique is to solve the H∞control problems. However, the conventional weighted H∞design does not meet the conditions required by lifting, so the result often leads to a misjudgement of the design. Two conditions required by using the lifting technique are presented based on the basic formulae of the lifting. It is pointed out that only the H∞disturbance attenuation problem with no weighting functions can meet these conditions, hence, the application of the lifting technique is quite limited. 展开更多
关键词 Sampled-data control system lifting technique design limitation H∞synthesis
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