基于部分集卡到达信息的码头进口箱翻箱优化

集装箱码头进口箱提箱作业过程中,由于外集卡到达时间的不确定性,存在外集卡提箱顺序与目标箱的堆存位置不一致,从而产生大量翻箱.为了解决这一问题,本文以期望翻箱量最小为落箱位置的选择原则,提出最小化二次翻箱启发式算法,利用算例验证算法的有效性,分析集卡到达的信息质量对进口箱提箱翻箱的影响,根据集卡到达信息质量的不同选择最佳翻箱规则.结果表明:提出的翻箱策略可以在获得部分集卡到达信息下有效地减少翻箱,针对不同的集卡到达信息质量,采取相应翻箱规则进行翻箱作业能有效减少翻箱,提高码头堆场的作业效率.     

基于朴素贝叶斯算法的船舶异常行为监测

随着海事事故与海上违法行为的不断增多,智能的监控方法成为降低海事事故,打击海上违法行为的有效手段.同时,船舶自动识别系统(Automatic Identification System,AIS)的普及及船舶交通管理系统(Vessel Traffic Service,VTS)的扩建,又为智能监控提供了数据支持.鉴于此,利用船舶自动识别系统提供的数据,分析通航水域船舶信息的分布情况,根据其概率分布采用朴素贝叶斯算法,从船舶航速、航向及距航道边界距离3个方面,构建船舶异常行为检测模型.最后,以成山角通航水域为例,检验模型的有效性.实验结果表明,构建的模型能够有效地完成异常行为监测,减少海事监管人员的工作强度,同时根据实验结果分析了成山角水域船舶航行的特点,并对成山角定线制提出合理化建议.     

交通大数据视角看广佛同城

广佛同城发展由来已久,是中国城市群中同城化程度最高的区域。简要分析广佛同城的交通基础设施发展演变历程,并基于模糊大数据(手机信令数据)和准确大数据(运行监测数据)对广佛通勤交通特征进行分析。结合手机信令数据对广州南站的客流组成及空间分布进行研究,对广州南站选址偏远问题进行解析。结果表明:广佛同城具有双向对等性的联系;地铁在同城化推进过程中起到重要的促进作用,拓展同城化活动范围;广州市机动车交通需求管理政策不够系统,非广佛车牌在通勤小汽车中比例超过40%,需要引起足够的关注;广州南站服务的客流中广州客流与佛山客流比为7:3,与对应的常住人口规模比例相当,初步实现了交通战略规划提出的共享理念。     

基于层次分析法的船体舭部分段划分方案评价及优化

基于层次分析法梳理船体舭部分段划分的影响因素,构建方案评价分析模型,计算各评价指标的权重,实现量化的方案评价,针对优选方案在总段搭载吊装过程中权重得分较低,应用TSV吊装软件,分析并提出相应解决措施。     

二赛线GTM沥青混合料设计

结合内蒙古自治区二连浩特-赛汉塔拉的工程实例,介绍了GTM混合料设计方法的特点,以及根据当地的气候、交通状况确定工程级配范围和室内采用GTM完成混合料的设计及技术性能的检验。     

Wind Generator Stabilization with Doubly-Fed Asynchronous Machine

This paper investigates the function of doubly-fed asynchronous machine(DASM)with emphasis placed on its ability to the stabilization of the power system including wind generators.P(active power)and Q(reactive power)compensation from DASM can be regulated independently through secondary-excitation controlling.Simulation results by power system computer aided design(PSCAD)show that DASM can restore the wind-generator system to a normal operating condition rapidly even following severe transmission-line failures.Comparison studies have also been performed between wind turbine pitch control and proposed method.     

Tool Wear Prediction in Micro-end-milling with Hard Material

The applications of micro-machining have increased drastically in the last ten years. However, tools with less than 1mm diameter using for micro-mills have very short and unpredictable life when they are used to cut hard metals. In this study, preliminary design of experiment (DOE) test program was conducted to investigate and identify the factors affecting tool wear at the micro-scale with hard material. Analysis of variance (ANOVA) and Taguchi method were efficient to determine appropriate cutting condition and the effect of parameters. A simple model was also developed to predict the width of slots on the workpiece along the cutting length. The obtained results can provide the basic guidelines for parameter setting of micro-end-milling with hard material.     

Design Consideration and Reconstruction Method for Double-source Double-multislice Spiral CT

To accelerate the scan speed and improve the image quality, a new type of CT configuration, "double-source double-multislice spiral CT" (DSDMS-CT), which is based on two sets of single-source multislice spiral CT was proposed with a special reconstruction algorithm. Simulation results using the fan-beam filtered backprojection algorithm with a special interpolation method were presented for both single-source multislice spiral CT and DSDMS-CT. The results of new CT model show that it scans faster than the traditional spiral CT and has a better slice sensitivity profile (SSP) with larger pitch value.     

Numerical Simulation Research on Laser Shock Forming of Thin Metal Sheet

Laser shock forming (LSF) of sheet metal is a new technique realized by applying an impulsive pressure generated by laser-induced shock wave on the surface of metal sheet.LSF of brass sheet metal was investigated using a Q-switched Nd:YAG laser with an energy per pulse of 15～50 joules.ABAQUS software was used to simulate laser shock forming process.The central displacement of the shocked region is measured and compared with the simulation.The higher pulse energy, the higher central displacement of the shocked region were obtained.The deformation of the simulation matches the experiment quite well.     

Study and Development of the Biped Ice Skating Robot with Passive Wheels

A new passive wheel type of biped ice-skating robot(BISR)which was able to imitate human skating motion was developed. Firstly, the characteristics of two types of human skating gait were introduced; secondly, after simplifying the kinematical model, the BISR's motion principle was presented; then the construction and control system of BISR were proposed; at last, the skating experiment of the BISR in a symmetric gait mode was conducted and some conclusions were drawn.