纯电动汽车自动变速器换挡规律研究

换档规律是自动变速器控制系统的核心技术,其控制参数选择的合理性直接影响纯电动汽车的动力性、舒适性和续驶里程．用纯电动汽车行驶加速度和加速踏板位置作为换挡控制参数,分别设计出动力性和经济性两种换挡规律,并用CRUISE软件进行仿真和优化,得出适合某型电动汽车变速器的换挡规律,实现了节能与增加续驶里程的目的．     

基于日发电调度计划的超额支付费用算法

对制定日发电调度计划中的各种约束条件进行了分析和归类,将约束划分为系统固有约束和被动约束,以此为基础定义了实际购电成本中的超额支付费用,并提出了一种通过考虑不同约束条件的组合制定日发电调度计划求取超额支付费用的计算方法.超额支付费用的计算方法能确定电网日常运行中超支的购电费用,帮助电网公司监控电网的经济运行状态,提高电网公司的经济运行水平,控制和降低运行成本.通过算例证明了该计算方法的有效性.     

无线传感器网络动态调度分簇算法

提出了一种基于K均值的无线传感器网络动态调度分簇算法(DSCA),不但考虑了能量感知这一重要问题,还针对无线传感网络的稳定性和可靠性,提出了节点的同步失效概念,通过采用K均值得到更加平衡的分簇,使得能量消耗更加平衡.该算法发展了一种基于信号接收强度指标(RSSI)而无需知道节点坐标的簇质心求解方法,提出了基于局部信息集中的动态多簇头选举机制和动态时分复用(TDMA)通信轮数分配机制,这些机制使无线传感网络的能量消耗达到了高度均衡,保证了节点的同步失效,提高了传感网络的稳定性和可靠性.仿真结果表明,算法可以减少约70%的簇重构次数.     

Passenger's fluctuation and chaos on ferryboats

We study the fluctuation of shipping passengers on a few ferryboats which shuttle between an origin and a destination repeatedly. We present the dynamical model for the ferryboats. The model is described in terms of nonlinear maps defined from the vectors T_i(n) and W_i(n), i=1, 2, …, N for N ferryboats where T_i(n) is the arrival time of ferryboat i at the origin on trip n and W_i(n) the number of passengers waiting at the origin on trip n. We clarify the fluctuations of shipping passengers and tour time for the ferry schedule. It is found that the dynamical transitions among the regular, periodic, and chaotic motions occur by varying the ferry's capacity F_max, headway T_min, and loading parameter ΓΠ. Even if the second ferryboat follows the leader (first ferryboat) keeping the constant headway, the passengers shipping on the second fluctuate highly when the parameters take specific values.     

Stochastic scheduling problems II-set strategies-

The paper introduces the finite class of set strategies for stochastic scheduling problems. It is shown that the knownstable classes of strategies such as ES and MES strategies are of this type, as arelist-scheduling strategies such as LEPT and SEPT and other, more complicatedpriority-type strategies. Roughly speaking, set strategies are characterized by the fact that the decision as to which jobs should be started at timet depends only on the knowledge of the two sets of jobs finished up to timet and being processed at timet. Contrary to list scheduling strategies, set strategies may involve deliberate idleness of machines, i.e. may not be greedy and can therefore not generally be induced by priority rules. It is demonstrated that set strategies have useful properties. They are e.g. ⁿ -almost everywhere continuous and therefore show satisfactorystability behaviour w.r.t. weak convergence of the joint distribution of job durations. Furthermore, the optimum w.r.t.all strategies is already attained on this class if job durations are independent and exponentially distributed and the performance measure fulfills a certainshift condition. This shift property is a quite natural concept and generalizes aspects of the notion ofadditivity in semi-Markov decision theory and stochastic dynamic optimization. Its complete analytical characterization is a major object of this paper. Typical additive cost criteria such as makespan and flowtime are of course covered, which yields simultaneously a first step towards generalization of optimality of LEPT and SEPT rules, as known for special cases. In fact, in view of the obtained optimality result, the question of when deliberate idleness of machines can be avoided, gains considerable interest, as it characterizes stochastic environments in whichpriority strategies are optimal. This provides a major link with current research on the analysis of networks of queues in the context of computer systems.The work of the first two authors was supported by the Minister für Wissenschaft und Forschung des Landes Nordrhein-Westfalen, while the work of the last author was supported by DAAD.     

单机排序问题1|r_j|L_(max)的分枝定界算法

给出了单机排序问题 1 |rj|Lmax的分枝定界算法     

桩基工程中施工质量的监控

实行工程监理是我国在建筑行业的一项重要改革.以工程桩的监理为实例,介绍了工程的质量、进度及管理等方面的监控.     

排水固结法的优化设计

经过排水固结法的经济分析及软土排水固结过程中的强度分析，提出了砂井参数及加载计划（工期）的优化设计方法。     

H型钢断面组织对其机械性能的影响

H型钢因其断面异型，轧制变形时金属流动性大，断面温度分布不均匀使得其断面组织均匀性很难得到控制。在建筑工程中H型钢的广泛应用，使得对产品的形状、尺寸精度和机械性能要求日益严格。在金属的塑性变形过程中，微观组织的演变对金属的机械性能有着很大的影响。为了研究组织对机械性能的影响，对产品的机械性能进行的拉伸实验并对组织性能进行了观测，分析了组织对机械性能的影响。并对轧制规程进行优化。