Logical control approach to fuel efficiency optimization for commuting vehicles

A novel gearshift control approach for improving the fuel efficiency of the conventional commuting vehicles is addressed in this paper, where the optimization problem for gear control is formulated in the framework of stochastic logical dynamic system. By extracting the stochastic features of the driver acceleration intention in the specific route, the Markov process model is deduced and then applied for the optimization algorithm. Based on the logical system framework, the finite horizon optimization problem is solved by means of the algebraic expression of the dynamic programming algorithm with a lower computational complexity, thereby resulting in an optimal gearshift decision law in statistical sense. The software simulation and engine-in-the-loop based experiment results demonstrate the better fuel economy performance can be achieved by the proposed logic control scheme.     

陈州古城排水系统改造方案研究

陈州古城四面环湖，不仅风景秀丽而且有着浓厚的历史文化底蕴。但由于生活污水长期直接入湖，已造成湖水水质污染。为有郊遏制陈州古城的外湖、内湖水质的进一步恶化，该文通过对其独特的地理环境、地形地势的分析，并结合其经济发展水平、现状排水体制等实际情况，提出切实可行的县城排水系统改造方案。     

Influence of model domain size,wind directions and Ekman transport on storm surge development inside the Chesapeake Bay: A case study of extratropical cyclone Ernesto, 2006

The Chesapeake Bay is vulnerable to severe flooding caused by hurricanes and strong Northeasters. A 3D storm surge model of the Chesapeake Bay is developed for studying the impact of model domain size, wind directions and Ekman transport on the storm surge in the Chesapeake Bay. The model encompasses the Chesapeake Bay and the US East Coast shelf to reduce the influence of model domain size on surge prediction inside the Chesapeake Bay and to account for both local and remote wind effects. This study used 3D model experiments, with respect to different wind directions, to diagnose the relative influences of the local and remote wind effects and Ekman transport on spatial surge distribution during storm events. The model results confirmed that spatial surge distribution can be well explained by the superposition of two distinct physically driven mechanisms during a storm event: incoming surge wave caused by remote effects and local wind forcings. A large model domain is a necessity for predicting storm surge accurately inside the Chesapeake Bay. The model results suggest that the interactions of the incoming surge propagating into the Bay and the local wind forcing from N and NE directions result in an enhanced setup in the lower to middle portions of the Bay, whereas the superposition of incoming surge and the local wind forcing from S and SE directions enhance the surge in the upper Bay region. A combined northwesterly wind over the middle to upper portions of the Bay and southwesterly wind over the lower Bay can cause a large setdown throughout the entire Bay. The Ekman setup along the coast contributes significantly to the water level variations during storm events. It enhances (reduces) surge inside the Bay under the wind forcings from N and NE (SW, S, and SE) directions.     

城市公交票价调整对策之我见

改革开放以来,我国的城市公共交通事业取得了瞩目的发展,为城市经济和社会发展做出了巨大的贡献,但是由于历史的原因,公共交通的价格与价值长期背离,已严重影响了公交企业的良性发展.为此,本文就公交票价的制定原则,票价形成过程及调整对策提出一些观点和看法.     

一种轻量化翼开启式厢体的设计

本文主要介绍了一种轻量化翼开启式厢体的结构,其整体为铆接牢固的板式厢体,内部采用胶木复合木板固定在厢体骨架上,在确保厢体强度的同时,减轻了厢体自身的重量;外表面采用轻质铝合金蒙皮,美观大方。厢体两侧翼可通过安装在侧翼与前墙、侧翼与后端总成之间的四个油缸控制实现向上90°的开启,方便叉车直接在侧面进行货物装卸,装卸效率高,广泛应用于托盘产品、汽车零部件以及其它商品配送等行业。     

地铁智能交通系统（MITS）研究

“智能交通系统”是国际公认的全面解决交通运输领域问题的根本途径，其含义是”综合运用先进的信息通信、网络、自动控制、交通工程等技术．改善交通运输的运行情况．提高运输效率和安全性．减少交通事故．降低环境污染．从而建立一个智能化、安全、便捷、高速、舒适、环保的综合运输体系”。欧美日等发达国家投入了大量人力、物力和财力对ITS的诸多领域进行了广泛研究和开发.     

HXD2型6轴电力机车动力学模型研究

针对HXD2型6轴电力机车的动力学性能，建立了较为详细的6轴机车在弹性结构轨道上运行时的空间耦合动力学模型。对于机车子模型，假设车体、转向架和轮对均为刚体，各部分通过两系悬挂连接起来，形成一个多自由度质量-弹簧-阻尼系统，每个刚体均具有5个自由度，整个机车模型共有45个自由度。对于轨道模型，左右两股钢轨均视为连续弹性离散点支承基础上的无限长Euler梁，并考虑钢轨的垂向、横向及扭转振动；轨枕视为刚性体，并考虑轨枕的垂向、横向及转动；道床离散为刚性质量块，只考虑道床垂向振动。而对于轮轨关系模型，采用了先进的空间耦合关系模型。     

基于集对分析理论的深圳港铜鼓航道危险度评价

通过分析影响深圳港铜鼓航道通航环境因素,应用集对分析理论,建立铜鼓航道危险度评价模型,实现对铜鼓航道危险度的定量评价,进而得出铜鼓航道通航环境的危险程度系数较高,为航道通航环境改善提供一定的依据.     

抓住机遇,将信息化建设推上新台阶——江南造船（集团）生产计划管理系统设计浅析

引言 伴随着长兴、龙穴、环渤海湾世界级造船基地的崛起,信息化在中国船舶企业战略决策中的地位越来越突出.江南造船(集团)借助江南造船整体搬迁的历史机遇,已经规划并正在建设具备当前最先进网络技术水平的信息化基础平台,包括万兆网络平台、完备的数据中心、一流的信息化办公平台等.