基于Windows数控系统的多线程实现

本文介绍了基于Windows平台数控系统的多线程的实现方法，着重阐述了数控系统多线程实现的线程创建、优先级设定和线程同步问题。     

混凝土泵送系统集成控制方法研究

针对泵送技术中的油缸换向可靠性差、液压系统换向冲击大、泵送效率低等技术难点,以泵送单元的控制为研究对象,通过对相关传递函数模型、状态空间描述模型的深入分析,提出一种泵送系统集成冗余控制方法:采用独特的信号采集方式,通过控制器闭环实时调整泵送系统的串联油缸同步状态,一体化解决上述泵送系统控制的技术难点。还探讨了这种串联油缸实时同步控制的控制律及实用的中央控制器运算策略,建立了VR泵送单元三维动态可视化模型及Simulink泵送单元动态系统模型,而其中的串缸同步补泄油逻辑控制模型,还利用StateFlow状态流建模技术。基于统一的MATLAB软件平台,对该控制方法进行必要的仿真,以验证该方法的可行性,并在实际工况下验证了该控制方法的技术优势。     

Synchronization for linear singularly perturbed complex networks with coupling delays

This paper is concerned with the synchronization problem about linear singularly perturbed complex network system with coupling delay. The sufficient delay-dependent conditions for the synchronization of the network are established by introducing an equivalent network system with the Lyapunov stability theory. These conditions, which are formulated in terms of linear matrix inequalities, can be solved efficiently by the LMI toolbox of MATLAB. A simulation example is provided to show the validity of the proposed the synchronization conditions of the whole network.     

一种休眠机制下无线传感器网络的自治愈方法

为减少无线传感器网络(WSNs)大规模应用中出现的节点同步失效、数据丢失的问题,通过对现有WSNs应用系统的研究,提出了一种全网节点同步休眠机制下WSNs的自治愈方法.详细介绍了该方法的设计思路、实现方法及测试过程.测试结果表明:此方法可针对数据丢失和时间同步失效的节点进行节点自救,实现丢失节点的再入网、再同步,提高WSNs系统的稳定性,为WSNs的应用提供更好的条件.     

基于区域扩散机制的无线传感器网络时间同步算法

针对当前无线传感器网络时间同步算法无法满足物联网对于网络实时性的要求,提出了一种基于区域扩散的无线传感器网络时间同步算法。该算法分为两个阶段进行:第一阶段根据生物觅食理论(OFT),按照收益率最高的原理提出一种代言人信息选择算法(SIE)进行区域内时间同步;第二阶段根据时间偏移量最小节点选择区域代言人并在区域之间进行二次同步,同时将同步过程映射到马尔可夫链,提出基于马尔可夫链的代言人加速算法(MarSAA)。理论分析和实验证明,提出的算法具有较好的时间复杂性;并且两阶段算法可以并行进行,相对于传统算法在全网时间同步上具有非常好的性能。     

Performance control for interconnection of identical systems: Application to PLL network design

In this paper, the problem of the control law design for interconnected identical systems ensuring the global stability and the global performance properties is under consideration. Inspired by the decentralized control law design methodology using the dissipativity input–output approach, the problem is reduced to the problem of satisfying two conditions: (i) the condition on the interconnection and (ii) the condition on the local subsystem dynamics. Both problems are efficiently solved applying a (quasi‐) convex LMI optimization and standard H_∞ synthesis. The proposed design methodology is applied to the control law design of a synchronous PLL network. Copyright © 2014 John Wiley & Sons, Ltd.     

Synchronization of a class of nonlinear network flow systems

In this paper, we consider the synchronization of a class of nonlinear network flow systems. Motivated by air distribution problem in air conditioning and mechanical ventilation (ACMV) systems, we propose a class of coupled nonlinear multi‐agent systems that can model a wide class of network flow systems, including air flow in ACMV systems, water flow in irrigation systems, traffic flow in transportation systems, and so on. Then we consider the synchronization problem for the class of nonlinear multi‐agent systems and propose cooperative controllers for the system. Based on graph theory, we derive conditions on the initial values of the state and the control input such that synchronization can be achieved. An application to air ventilation is provided to demonstrate the effectiveness of the cooperative controllers. Copyright © 2015 John Wiley & Sons, Ltd.     

Exponential synchronization of nonlinear multi‐agent systems with time delays and impulsive disturbances

The problem of cooperative synchronization of nonlinear multi‐agent systems with time delays is investigated in this paper. Compared with the existing works about synchronization (or consensus) of multi‐agent systems, the method in this paper provides a more general framework by considering nonlinear multi‐agent systems with time delays and impulsive disturbances. The model in this paper is sufficiently general to include a class of delayed chaotic systems. Based on the Lyapunov stability theory and algebraic graph theory, sufficient conditions are presented to guarantee the cooperative exponential synchronization for these multi‐agent delayed nonlinear systems. These conditions are expressed in terms of linear matrix inequalities, which can easily be checked by existing software tools. It is seen that the Lyapunov functions must be constructed based on the graph topology to prove synchronization. The well‐known master–slave (drive‐response) synchronization of two chaotic delayed systems is a special case of this paper, and therefore, the results in this paper are also useful for practical applications in secure communication. Simulation results verify the effectiveness of the proposed synchronization control algorithm. Copyright © 2015 John Wiley & Sons, Ltd.     

Control of Julia Sets in Generalized Alternated System

In this paper, we first introduce the generalized alternated system. The definition of the Julia set in the generalized alternated system is given, which is called a generalized alternated Julia set. Then, we achieve the control of generalized alternated Julia sets by applying the classic control methods, which are gradient control and optimal control. In addition, the synchronization between two different generalized alternated Julia sets is implemented using gradient control and optimal control. The simulations illustrate the effectiveness and correctness of these two control methods, and the results are displayed in 2D computer graphics.     

混合休眠策略的ZigBee多点监控自组网设计

分析了ZigBee多点监控网络中休眠节点工作不同步、网络性能不稳定等问题,提出基于混合休眠策略的 ZigBee多点监控自组网设计方案,完成基于Z Stack的软件设计,并组建ZigBee星型网络进行测试。实验结果表明,节点在维持低功耗的同时,系统的同步性、稳定性得到了提高。