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1.
《Journal of The Franklin Institute》2022,359(13):6829-6855
In this paper, the linear quadratic (LQ) optimal decentralized control and stabilization problems are investigated for multi-sensors networked control systems (MSNCSs) with multiple controllers of different information structure. Specifically, for a MSNCS, in view of the packet dropouts and the transmission delays, each controller may access different information sets. To begin with, the sufficient and necessary solvability conditions for the LQ decentralized control problems are developed. Consequently, for the purpose of deriving the optimal decentralized control strategy, an innovative orthogonal decomposition method is proposed to decouple the forward and backward stochastic difference equations (FBSDEs) from the maximum principle. In the following, we show that the optimal decentralized controller can be calculated according to a set of Riccati-type equations. Finally, a stabilizing controller is derived for the stabilization problem. 相似文献
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《Journal of The Franklin Institute》2019,356(12):6175-6207
In this paper, we consider leader–follower decentralized optimal control for a hexarotor group with one leader and large population followers. Our hexarotor is modeled based on the quaternion framework to resolve singularity of the rotation matrix represented by Euler angles, and has 6-DoF due to six tilted propellers, which allows to control its translation and attitude simultaneously. In our problem setup, the leader hexarotor is coupled with the follower hexarotors through the followers’ average behavior (mean field), and the followers are coupled with each other through their average behavior and the leader’s arbitrary control. By using the mean field Stackelberg game framework, we obtain a set of decentralized optimal controls for the leader and N follower hexarotors when N is arbitrarily large, where each control is a function of its local information. We show that the corresponding decentralized optimal controls constitute an ϵ-Stackelberg equilibrium for the leader and N followers, where ϵ → 0 as N → ∞. Through simulations with two different operating scenarios, we show that the leader–follower hexarotors follow their desired position and attitude references, and the followers are controlled by the leader while effectively tracking their approximated average behavior. Furthermore, we show the nonsingularity and 6-DoF control performance of the leader–follower hexarotor group due to the novel modeling technique of the hexarotor presented in the paper. 相似文献
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Finite-time stability involves dynamical systems whose trajectories converge to an equilibrium state in finite time. Since finite-time convergence implies nonuniqueness of system solutions in reverse time, such systems possess non-Lipschitzian dynamics. Sufficient conditions for finite-time stability have been developed in the literature using Hölder continuous Lyapunov functions. In this paper, we develop a general framework for finite-time stability analysis based on vector Lyapunov functions. Specifically, we construct a vector comparison system whose solution is finite-time stable and relate this finite-time stability property to the stability properties of a nonlinear dynamical system using a vector comparison principle. Furthermore, we design a universal decentralized finite-time stabilizer for large-scale dynamical systems that is robust against full modeling uncertainty. Finally, we present two numerical examples for finite-time stabilization involving a large-scale dynamical system and a combustion control system. 相似文献
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云计算环境下应急知识共享机制研究 总被引：1，自引：0，他引：1
云计算在带来超计算能力的同时,也给信息资源、知识资源的共享提供了新思路。通过分析云计算的工作原理及服务模式和应急知识“分散、缺少应用需求、共享不足”的现状,将云计算与应急知识管理相结合,在细化应急知识构成和分析运用专有云维护应急知识的基础上,提出了云计算环境下应急知识的共享机制,旨在打破应急决策信息不足或应急知识共享渠道闭塞的现象。 相似文献
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In this contribution, we develop continuous completely decentralized state-feedback adaptive controllers with sliding mode for a class of large-scale interconnected systems with nonlinear interconnections with unknown time-varying state delays. The novel contribution of this paper is that asymptotically exact tracking within the framework of completely decentralized direct continuous adaptive control is possible also for a class of nonlinear plants with matched interconnections and disturbances. 相似文献
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This paper addresses the challenging problem of decentralized adaptive control for a class of coupled hidden leader-follower multi-agent systems, in which each agent is described by a nonlinearly parameterized uncertain model in discrete time and can interact with its neighbors via the history information from its neighbors. One of the agents is a leader, who knows the desired reference trajectory, while other agents cannot receive the desired reference signal or are unaware of existence of the leader. In order to tackle unknown internal parameters and unknown high-frequency gains, a projection-type parameter estimation algorithm is proposed. Based on the certainty equivalence principle and neighborhood history information, the decentralized adaptive control is designed, under which, the boundedness of identification error is guaranteed with the help of the Lyapunov theory. Under some conditions, it is shown that the multi-agent system eventually achieves synchronization in the presence of strong couplings. Finally, a simulation example is given to support the results of the proposed scheme. 相似文献
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紫坪铺水库移民安置土地调整的利益冲突问题 总被引：2，自引：1，他引：1
紫坪铺水库移民安置坚持开发性移民的方针,遵循以农为主,以土为本,采取适度集中、分户安插、自谋职业和投亲靠友相结合的安置方式,实现移民相对集中到县(市)、分散安置到村组,达到移民"搬得出、稳得住、逐步能致富"的目标。移民的承包地、自留地和宅基地,主要通过在安置区政府主导下的土地调整模式来解决,安置区村组调出土地获得的补偿费用则根据各村组接纳的移民人数拨付。在实际操作中,安置区村组获得的补偿费用主要用于基础设施建设、调整产业结构和增加农业收入,以及个别村组将剩余经费按村组总人数平均发放到户等。土地调整不仅与现在的农村土地政策相违背,而且土地调整过程中存在着利益分配混乱和各方支出和收益不均衡等问题,导致移民安置过程中权利各方之间形成潜在的利益冲突,影响到未来水库移民生产安置的顺利进行。文章最后针对移民安置过程中各方利益冲突的具体表现,提出了相应的对策建议。 相似文献
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《Journal of The Franklin Institute》2023,360(13):9329-9354
In this paper, we study the problem of decentralized optimization to minimize a finite sum of local convex cost functions over an undirected network. Compared with the existing works, we focus on improving the communication efficiency of the stochastic gradient tracking method and propose an effective event-triggering decentralized stochastic gradient tracking algorithm, namely, ET-DSGT. ET-DSGT utilizes the event-triggering mechanism in which each agent only broadcasts its estimators at the event time to effectively avoid real-time communication, thus improving communication efficiency. In addition, we present a theoretical analysis to show that ET-DSGT with a decaying step-size can converge to the exact global minimum. Moreover, we show that for each agent, the time interval between two successive triggering times is greater than the iteration interval under certain conditions. Finally, we provide several simulations to demonstrate the effectiveness of ET-DSGT. 相似文献
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土地整治中农民居住方式变化的生态环境行为效应分析 总被引：2，自引：0，他引：2
土地整治带来了农民由分散到集中的居住方式变化,由此也对农民生活及农村生态产生了一系列的影响.本文基于南京市高淳县、溧水县以及六合区18个村183个农户的调研数据,分集中居住(10个村,101个农户样本)与分散居住(8个村,82个农户样本)两个组,并运用描述性分析、对比分析、独立样本T检验等方法对集中居住区与分散居住区农民生态环境行为进行了差异性分析.结果表明: 土地整治中农民居住集中化,与此同时其生活方式、生态环境行为方式也出现了与分散居住区农民显著不同的变化.集中居住区农户与分散居住区农户相比,在生活垃圾、生活污水处置方式、能源及户厕使用种类等方面存在显著差异,总体上,集中居住区农户生活废物废水的处理方式得到好转,能源利用效率提升.因下水管网建设不完善或缺少处理设施,集中居住区生活污水大多集中后外排,这种排污模式对社区外生态环境造成不良影响,同时使农民生活排污的外部性影响由社区内转变为社区外.这对今后改进土地整治工作而言,必须考虑到农民居住方式变化的生态环境行为效应.在相应评估基础上的土地整治才能处理好农业生产、农民生活及农村生态之间的关系,对三生空间格局的优化才具有真正的指导意义和示范价值. 相似文献
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根据自然与社会环境的特点,跨界流域经常被看作是由具有自利性和异质性的相互联系的各用水区主体构成。实践表明以流域管理机构行政配置为基础的水资源集中优化配置模式不能很好地解决跨界水资源冲突问题。分散优化方法考虑各用水区主体的自利性和异质性,是解决跨界水资源冲突的可行水资源配置方法。本文以漳河流域水资源配置为实例,基于分散优化方法建立流域水资源配置模型,并将配置结果与集中优化配置结果进行对比。研究表明,分散优化配置模式通过多轮博弈,使系统内各主体的自利因子值相等。系统最终平衡在较小的自利因子值上,形成较优的配置方案。这种配置模式对于地方保护色彩浓郁、跨界水资源冲突不断的漳河流域,比集中优化配置模式更加符合管理目标。 相似文献
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基于不同政府采购模式下的图书馆文献采购工作研究 总被引：1，自引：0，他引：1
政府采购模式包括集中采购模式、分散采购模式和集中采购与分散采购相结合模式。我国政府采购实行集中采购和分散采购相结合。文章对不同政府采购模式下的图书馆文献采购工作进行探索研究。 相似文献
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In this paper, we develop an approach for solving the problem of sliding mode decentralized adaptive state-feedback tracking with continuous control actions for a class of uncertain nonlinear dynamical systems. In addition to the traditional asymptotic zero error tracking specification in the sliding mode decentralized model reference adaptive control (MRAC) problem formulation, here an additional requirement is specified explicitly in the problem statement. The tracking objective is described by a set of admissible reference trajectories, called a performance tube. The input signal to the reference model, selected within specified bounds, is used as a design parameter. The best reference trajectory is found by solving an additional optimization problem whose criterion penalizes the variance of the control signal. 相似文献
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鉴于众多学者从产品模块化和生产策略两个单独角度研究了对实施大规模定制化的影响。本文针对电子商务背景下,将退货策略引入到大规模定制化供应链系统中,根据上游的模块化生产企业（大规模生产）和下游的组装企业（定制化生产）生产的差异,建立了集中式和分散式决策模型,分别讨论了在电子商务环境下模块化生产企业和定制化组装企业的最优退货率和最优模块化程度,以及对提前期和销售价格的影响。研究表明：在电子商务环境下,大规模定制化的最优退货策略不仅于依赖于模块化程度,还与市场需求量和供应链的决策方式有关。此外,在电子商务环境下分散式决策存在“双边效应”问题,于是通过纳什讨价还价契约实现了供应链的完美协调。最后通过数值分析进一步验证了相应的结论,并给出了一些建议和启示。 相似文献
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Salwa Elloumi Basma Abidi Naceur Benhadj Braiek 《Journal of The Franklin Institute》2013,350(10):2994-3010
In this paper, we propose to develop algorithmically and implement a nonlinear decentralized optimal control for multimachine power systems, based on a successive approximation approach for designing the optimal controller with respect to quadratic performance index. The advantage of this approach is to transform the high order coupling nonlinear two-point boundary value (TPBV) problem into a sequence of linear decoupling TPBV problem, which uniformly converges to the optimal control for nonlinear interconnected large scale systems. We apply this approach to a 3-machine power system which generators are strongly nonlinear interconnected, and containing possible uncertainties on the parameters. We demonstrate clearly via advanced simulations that this approach brings better performances than other decentralized controller, improving effectively transient stability of these power systems in few iterative sequences for different cases of perturbations. 相似文献
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关于集中RD还是分散RD更能促进企业创新绩效,现有研究存在观点分歧。本文基于国内上市的高新技术企业,从知识基础观和组织经济学的不同视角,对RD组织方式与企业创新绩效的关系进行理论分析和实证研究。在此基础上考察资源状况对上述关系是否产生影响,通过引入分别体现资源丰裕程度和资源多样性程度的变量:组织冗余和多元化,利用方差分析与回归分析方法探究其对于上述关系的调节作用。结果显示,分散RD更能促进企业创新绩效,这种促进关系在不同行业中无显著差异,并受到未吸收组织冗余和产品多元化的正向调节作用。本研究结论对国内企业选择有效的RD组织方式具有实际指导意义。 相似文献
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A global decentralized low-complexity tracker design methodology is proposed for uncertain interconnected high-order nonlinear systems with unknown high powers. It is assumed that interconnected nonlinearities are bounded by completely unknown nonlinearities, rather than, a linear combination of high-ordered state variables. Compared with the existing decentralized results for interconnected nonlinear systems with known high powers, the decentralized robust controller, which achieves the pre-designable transient and steady-state tracking performance for each subsystem, is designed by employing nonlinear error surfaces with time-varying performance functions, regardless of unknown nonlinear interactions and high powers related to virtual and actual control variables. The proposed decentralized continuous robust low-complexity tracker is realized without the use of any adaptive or function approximation techniques for estimating unknown parameters and nonlinearities. The stability and preassigned tracking performance of the resulting decentralized low-complexity control system are thoroughly analyzed in the Lyapunov sense. Finally, simulation results on coupled underactuated mechanical systems are provided to show the effectiveness of the proposed theoretical result. 相似文献
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运用博弈理论研究再造品不同生命周期阶段下回收品和再造品的定价决策问题。逆向供应链决策模式被分为集中决策和回收商为领导者的分散决策、再制造商为领导者的分散决策三种模式。通过结果比较分析,整个生命周期内集中式供应链的回收量和系统总利润最高,生态效益最大。两种分散式供应链的优劣则决定于废旧品价格敏感程度与再造品价格敏感程度的大小对比。在同一供应链决策模式中,废旧品价格敏感程度小于再造品价格敏感程度时的回收量和总利润高于废旧品价格敏感程度,大于再造品价格敏感程度时的回收量和总利润。 相似文献
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鉴于众多学者从宏观和微观层面研究了碳税对二氧化碳减排效果和企业生产决策的影响,本文首次从供应链的视角建立了集中式和分散式决策模型,分别讨论了碳税政策下制造商和零售商的最优二氧化碳减排和定价策略,以及税率对单位产品二氧化碳减排量和销售价格的影响。研究表明:碳税政策下单位产品的二氧化碳减排量和销售价格不仅依赖于碳税税率,还与其初始二氧化碳排放量以及供应链的决策方式有关。此外,碳税政策下分散式决策存在"双重边际效应"问题,于是通过两部定价合同实现了供应链的完美协调。最后通过数值仿真进一步验证了相应的结论,并就如何提高供应链的减排效率给出了一些建议和对策。 相似文献