水泥散装无人值守系统数据管理

数据的实时性、准确性、全面性和灵活性是水泥散装无人值守高效、稳定、可靠运行的保证。本文主要以某水泥集团散装技改为例,讨论散装无人值守系统中运用的技术手段和对数据的管理。     

滚切式双边剪剪切质量分析

分析了4种中厚板切边过程中切口缺陷的形状及其形成原因,得出防止钢板在被夹送时跑偏即可避免剪切缺陷并采取了相应对策,实施后提高了钢板成材率。     

万能法轧工字钢

介绍了用万能法轧制工字钢的孔型设计、配辊和轧制压下规程等情况,采用此法已在马鞍山钢铁公司H型钢厂成功生产了8000t工字钢。     

冷热饮水机分流阀注射模设计

根据分流阀的结构特点,介绍了分流阀注射模的主要结构,该结构解决了外螺纹侧向抽芯与塑件上小孔的4个方向抽芯问题,并就模具浇注系统的偏心问题的解决方法进行了说明     

An analytical framework for integrated maritime terminal scheduling problems with time windows

Container transport, an integral part of intercontinental trade, has steadily increased over the past few decades. The productivity of such a system, in part, hinges on the efficient allocation of terminal resources such that the container transit time is minimized. This study provides an analytical framework, which entails efficient scheduling of quay and yard cranes, to minimize the time spent by containers at a terminal. A mixed-integer programming model is developed to capture the two-stage multi-processor characteristic of the problem, where each crane has specific time window availability. A genetic algorithm equipped with a novel decoding procedure is developed. The mixed-integer model is tested on a number of problem instances of varying sizes to gain managerial insights.     

On the performance of economic model predictive control with self-tuning terminal cost

In this paper, we analyze the closed-loop performance of a recently introduced economic model predictive control (MPC) scheme with self-tuning terminal cost. To this end, we propose to use a generalized terminal region constraint instead of a generalized terminal equality constraint within the repeatedly solved optimization problem, which allows us to obtain improved closed-loop asymptotic average performance bounds. In particular, these bounds can be obtained a priori. We discuss how the necessary parameters for the generalized terminal region setting can be calculated, and we illustrate our findings with two numerical examples.     

智能电动车辆横纵向协调与重构控制

针对具有高度非线性、强耦合和冗余特性的智能电动车辆运动控制问题,提出了一种由协调控制律和控制分配律组成的横纵向综合控制新方法.首先,建立准确表征智能电动车辆行为机理的动力学模型;其次,采用非奇异滑模控制技术,引入非线性滑动模态切换面,设计有效克服非线性及不确定特性的协调控制律,保证系统状态在有限时间内收敛至平衡点;在此基础上,考虑到轮胎存在冗余和耦合特性,提出基于内点法的控制分配算法来完成期望广义力/力矩的优化分配,实现轮胎横纵向力的协调与重构.仿真结果表明了该方法的有效性.     

基于Android的会议终端

为满足会议系统对设备小型、智能、方便运输、易于拓展的要求,设计并实现了一种基于Android的会议终端。终端采用可扩展标记语言（ XML）文件定义用户界面,实现界面逻辑与业务逻辑分离,具有很强的自适应性;采用跨平台的Socket通信方式和JSON数据交换语言与服务器进行通信,并结合使用UDP和TCP协议,实现了终端与服务器的松耦合;终端设置项少,无须录入会议内容,简化了用户操作;利用Android内置的SQLite数据库保存会议信息和结果,使数据管理简单高效。阐述了终端的整体设计,给出了终端程序的模块划分和流程。实验表明,终端工作流畅稳定,运行无明显延时,可以为现代会议提供优质的服务。     

框架结构护岸新技术在城市河道中的应用

好溪堰河是贯穿浙江省丽水市主城区的一条千年古河道,在河道整治过程中,受制于河道周边的密集建筑物,传统的河道护岸技术均难以同时满足水利、市政、交通及景观的多元化要求。在分析其他创新河道护岸技术特点及存在问题的基础上,提出了适用于城市河道的桩柱式、框柱式两种框架结构护岸新技术,这两种护岸在维护河道周边建筑物稳定的同时,均具有不加深河床就可拓宽河道过流断面、不减少河岸用地、保持岸路畅通、改善水质及生态效果、提高亲水性等优点,在丽水好溪堰河水系整治工程中应用较为成功。     

A domain-specific knowledge-based heuristic for the Blocks Relocation Problem

The Blocks Relocation Problem consists in minimizing the number of movements performed by a gantry crane in order to retrieve a subset of containers placed into a bay of a container yard according to a predefined order. A study on the mathematical formulations proposed in the related literature reveals that they are not suitable for its solution due to their high computational burden. Moreover, in this paper we show that, in some cases, they do not guarantee the optimality of the obtained solutions. In this regard, several optimization methods based on the well-known A¹ search framework are introduced to tackle the problem from an exact point of view. Using our A¹ algorithm we have corrected the optimal objective function value of 17 solutions out of 45 instances considered by Caserta et al. (2012) [4]. In addition, this work presents a domain-specific knowledge-based heuristic algorithm to find high-quality solutions by means of short computational times. It is based on finding the most promising positions into the bay where to relocate those containers that are currently located on the next one to be retrieved, in such a way that, they do not require any additional relocation operation in the future. The computational tests indicate the higher effectiveness and efficiency of the suggested heuristic when solving real-world scenarios in comparison with the most competitive approaches from the literature.