立交匝道平面线形优化设计及MATLAB的应用

本文在探讨最优化计算理论与方法的基础上,分析立交匝道平面线形设计的特点与方法,拟定线形组合型式,建立平面线形优化设计的数学模型,给出相应的优化计算方法,并应用大型通用的辅助计算软件MATLAB优化工具箱里的优化函数,实现线形参数的优化设计。     

立交桥匝道沉陷原因分析与治理

通过对哈尔滨二环南直路立交桥匝道 4填方工程产生的沉陷进行补充勘察 ,分析了沉陷产生的原因 ,提出了软弱新近堆积土补强方法 ,介绍了其治理效果     

Quantifying effects of ramp metering on freeway safety

This study presents a real-time crash prediction model and uses this model to investigate the effect of the local traffic-responsive ramp metering strategy on freeway safety. Safety benefits of ramp metering are quantified in terms of the reduced crash potential estimated by the real-time crash prediction model. Driver responses to ramp metering and the consequent traffic flow changes were observed using a microscopic traffic simulation model and crash potential was estimated for a 14.8 km section of I-880 in Hayward, California and a hypothetical isolated on-ramp network. The results showed that ramp metering reduced crash potential by 5-37% compared to the no-control case. It was found that safety benefits of local ramp metering strategy were only restricted to the freeway sections in the vicinity of the ramp, and were highly dependent on the existing traffic conditions and the spatial extent over which the evaluation was conducted. The results provide some insight into how a local ramp metering strategy can be modified to improve safety (by reducing total crash potential) on longer stretch of freeways over a wide range of traffic conditions.     

基于Ramp响应技术的雷达目标3D图像重构

在雷达目标识别的应用中,目标形状的3D图像可提供识别目标的最直接和最有用的信息。Ramp响应技术是一种应用最为广泛的低频雷达目标成像技术,而最终的目标图像质量主要取决于图像重构算法的性能。因此,在详细介绍了两种典型的基于Ramp响应技术的3D图像重构算法的基础上,对两种算法在不同条件下进行了仿真比较,提出了一种计算重构图像轮廓函数的算法,并利用该算法计算图像与目标之间的误差,分析比较了两种算法的性能,得出了有益的结论。     

三山岛金矿新立分矿斜坡道通风系统优化

以三山岛金矿新立分矿斜坡道通风系统为研究对象,针对其存在的斜坡道能见度低、炮烟矿尘积聚、湿度大以及各个中段联巷风流紊乱等问题,运用通风网络优化技术以及风机优选技术展开了系统研究,提出采用强制通风方式将矿山主竖井、措施井的新鲜风流从-240 m中段东北巷引入斜坡道的通风模式,并采用Ventsim三维通风动态仿真模拟软件进行了解算。结果表明：通过优化井下东、西两翼回风路线,在67#线运输巷增设1台K45-6-№16型风机后,斜坡道进风量由15.03 m3/s提高至50.12m3/s,-320,-360,-400,-440,-480 m中段斜坡道联巷的进风量分别为11.33,11.21,11.15,11.09,11.01 m3/s,理顺了斜坡道通风系统,斜联巷风流紊乱现象得到有效改善,为矿山安全生产提供了技术支撑。     

Multi-agent based traffic simulation and integrated control of freeway corridors: Part 1 simulation and control model

Freeway corridors consist of urban freeways and parallel arterials for alternative use. Ramp metering in freeways and signal control in arterials are contemporary traffic control methods that have been developed and applied in order to improve the traffic conditions of freeway corridors. However, most existing studies have focused on either optimal ramp metering in freeways or progressive signal strategies between arterial intersections. For efficient control of freeway corridors, ramp metering and signal control must be considered simultaneously, as otherwise the control strategies for freeway operation may disturb arterial traffic. On the other hand, traffic congestion and arterial bottlenecks that arise with increasing traffic volume at peak hours and ineffective signal operation may cause problems with accessibility to freeway ramps and degrade the urban freeway’s ability to act as a through-traffic process. This research dynamically estimates the traffic stream between an urban freeway and its ramps according to changes in the freeway structure, traffic passing demand, and control methods due to restricted valid information. The results are then compared with those from other methods. Finally, the integrated control in the urban freeway traffic axis is optimized based on the expected traffic stream, by using design of experiment (DOE), neural network (NN), and a simulated annealing algorithm. This paper was recommended for publication in revised form by Associate Editor Kyongsu Yi Myung-Won Suh is a professor of Mechanical Engineering. During 1986–1988, he worked in Ford motor company as researcher. During 1989–1995, he worked in technical center of KIA motors. He took a BS Degree in Mechanical Engineering from Seoul National University and an MS Degree in Mechanical Engineering from KAIST, South Korea. He obtained his Doctorate at University of Michigan, USA, in 1989. His research areas include the structure and system optimization, advanced safety vehicle and reliability analysis & optimization. Chul-Ho Bae is a PhD candidate at Sungkyunkwan University in Suwon, South Korea. He accomplished fellowship work as researcher at Mississippi State University, USA, in 2003 and 2005. He worked in Institute of Advanced Machinery and Technology (IMAT) as a Research Assistant in 2004. He was a part time Lecturer in computer aided Mechanical Engineering of Ansan College of Technology, Suwon Science College, and Osan College during 2004–2005. He took a BS Degree in Mechanical Design and an MS Degree in Mechanical Engineering from the Sungkyunkwan University. His research interests include computer aided engineering, reliability engineering, and optimization.     

接水盒注塑成型工艺分析及模具设计

介绍了冰箱接水盒注塑件的成型工艺特点及注塑模具的结构特点及工作过程。通过采用斜导柱,弹簧等为动力实现了侧孔,卡钩等注塑件上的侧成型特征。该注塑模具设计成为需要侧成型开关的注塑模具典范。     

MasterDrive变频器使用外加斜坡给定的研究与应用

西门子MasterDrive变频器内部带有一个复杂功能的斜坡发生器,用于将阶跃给定增加斜坡后发给速度调节器。在某些场合比如设备需要复杂起动特性的时候,变频器需要接收外加的带斜坡的速度给定,这就需要对其进行特殊的设置。本文对外加含斜坡速度给定信号进行了分析,并提出了处理方法,最后举例说明了该方法的实际应用情况。     

论住宅区坡地景观设计现状及其发展趋势

目前,我国的住宅区坡地设计有三种倾向:统一和融合、多功能性、现代技术和现代材料的使用,并存在形式化和盲目性问题.住宅区坡地设计的发展趋势表现在整体性、人性化、创新和可持续发展方面.     

On the design and selection of vehicle coordination policies for underground mine production ramps

Traffic management in underground mines,especially on production ramps,is a difficult problem to optimize and control.Most operations use one of a few common policies;e.g.,the so-called ‘‘lock-out" and‘‘loaded-vehicle-priority" policies.The work presented in this paper uses discrete-event simulation to study the efficiency of multiple policies.Based on simulation results,an improvement to the common lock-out policy is proposed.This new policy utilizes the rules of the lock-out policy but integrates an option that allows a group of vehicles to be given temporary priority in a certain direction of travel.Quantitative results are provided and,based on these,a systematic technique for ramp design that aims to optimize the efficiency of underground mine ramp traffic flow is described.