基于线性叠加的智能船舶经济性评估模型构建

经济性是智能船舶能否实现推广应用的关键,目前国内外有关智能船舶经济性分析的研究较少。本文通过对传统船舶经济性分析方法进行修正优化,提出智能船舶经济性分析计算模型,并根据理论推导结果,得出智能船舶经济性分析的线性叠加简化模型,并利用40万吨级VLOC实际运营数据进行科学性检验。本文提出的模型与方法适用于各类智能模块加装情况下的经济性核算,为相关单位开展智能船舶经济性快速分析提供了理论支持和解决方案。     

面向新型混合交通流的智能交叉口网络布局优化

考虑网联自动驾驶车辆(Connected Autonomous Vehicle, CAV)应用先进的车联网与自动驾驶技术，可以采用智能交叉口的组织形式，大幅提升交叉口的通行效率，为降低CAV与人工驾驶车辆(Human-driven Vehicle, HV)混行条件下城市交通系统的整体出行成本，提出智能交叉口在城 市交通网络中的布局优化问题，建立数学优化模型并求解。首先，基于对两类车辆行驶特性的分析，建立混合用户均衡模型，描述CAV与HV的路径选择行为；其次，从交通规划者的角度，以系统最优为目标，整合混合用户均衡模型，建立面向新型混合交通流的智能交叉口网络布局优化模型，并利用改进的遗传算法求解；最后，选取Sioux-Falls交通网络作为案例分析，验证模型与算法的有效性，并研究CAV渗透率变化对优化结果的影响。研究表明，智能交叉口在城市路网中的合理规划极大地提高了新型混行场景下城市交通系统的出行效率，同时，大幅降低了由于网联自动 驾驶单方面技术优势带来的CAV与HV的出行效率差距，增进了出行公平性。     

Dynamic Simulation of a Smart Crank and Slider Mechanism

In this paper, a smart crank and slider mechanism is analyzed mostly from a dynamic view. By means of dynamic explicit finite element method, 3D nonlinear structure is simulated. It is proved that the mechanism can effectively accomplish smart movement prescribed. And in order to ensure reciprocal movement with higher frequency, measures should be taken to avoid over heating of parts. Compared with internal energy, kinetic energy of total rigid body is dominating, and Y direction equivalent rigid velocity is much higher than X direction velocity. Equivalent rigid velocity of all parts is consistent with respective movement condition. For both energy and velocity, slider effect is dominating. Three direction equivalent inertia force oscillates. Force amplitude in Y -direction is comparitively the greatest.     

单桨单舵船舵设计与操纵性试验

以1500t海监船为例，对单桨单舵船的舵型、舵面积等参数的选取，桨、舵的相对位置与双桨双舵高速船的区别进行了研究及比较，同时对该船型的偏航原因进行分析及对纠正偏航提出改进措施。     

浅析船舶舵系故障非常规修理

文章主要讲述了“邦建”轮舵系的故障现象,故障分析,系统检测及修复全过程。如果按常规方法维修,舵系必须进行拉线对中,镗孔,更换上、中、下舵承衬套。但我们根据实际检测情况,采用非常规修理方法,不但达到维修的目的,而且节省了修理时间和费用。     

共翼型舵特性及其对潜艇潜浮运动影响研究

共翼型舵是一种新型的潜艇组合舵翼操纵面.文章首先通过水洞试验和CFD计算对共翼型舵的敞水水动力性能进行了研究,结果表明,共翼型舵的舵效随弦长比和展弦比增大,封堵舵翼之间的间隙可以显著提高舵的水动力性能.随后通过CFD计算对比了分别安装有普通舵、共翼型舵和封堵缝隙的共翼型舵的潜艇的潜浮运动,结果显示,5°舵角时,安装共翼型舵和封堵缝隙的共翼型舵的潜艇模型潜浮角分别比安装普通舵的模型提高65％和105％左右.     

基于智慧地铁视角的广州地铁AFC系统架构设计

自动售检票(AFC)系统作为城市轨道交通中与乘客接触最为紧密的系统,应基于“以用户为中心”来提升客运服务水平。通过优化系统层级、整合多元化支付平台、引入智能客服功能、对接电子发票系统等措施,规划设计了适用于广州新一轮城市轨道交通线网建设要求的AFC系统架构,以期打造智慧的AFC系统,为乘客提供更为人性化和多元化的服务。     

Validating and improving public transport origin–destination estimation algorithm using smart card fare data

Smart card data are increasingly used for transit network planning, passengers’ behaviour analysis and network demand forecasting. Public transport origin–destination (O–D) estimation is a significant product of processing smart card data. In recent years, various O–D estimation methods using the trip-chaining approach have attracted much attention from both researchers and practitioners. However, the validity of these estimation methods has not been extensively investigated. This is mainly because these datasets usually lack data about passengers’ alighting, as passengers are often required to tap their smart cards only when boarding a public transport service. Thus, this paper has two main objectives. First, the paper reports on the implementation and validation of the existing O–D estimation method using the unique smart card dataset of the South-East Queensland public transport network which includes data on both boarding stops and alighting stops. Second, the paper improves the O–D estimation algorithm and empirically examines these improvements, relying on this unique dataset. The evaluation of the last destination assumption of the trip-chaining method shows a significant negative impact on the matching results of the differences between actual boarding/alighting times and the public transport schedules. The proposed changes to the algorithm improve the average distance between the actual and estimated alighting stops, as this distance is reduced from 806 m using the original algorithm to 530 m after applying the suggested improvements.     

基于有限元及试验对舵系无键连接的可靠性分析

以舵系的实际工况和参数为依据,采用无键连接的方式来优化舵系的连接,并利用有限元分析舵系新型无键连接的可靠性,通过有限元计算在不同工况下无键连接方式的应变及应力的分布初步验证了该连接方式的可靠性;同时以舵系实际工况的弯矩、扭矩和过载为依据建立了舵系无键连接的实验平台来验证有限元分析的结果。实验数据和分析结果表明:通过液压螺母在舵系上形成的预加载荷使舵柄和舵杆之间产生适当的静摩擦力,该静摩擦力可以提供舵系所需要的弯矩、扭矩并能够保证超载条件下舵系工作状态的稳定性及可靠性。     

智能天线系统中干扰抵消的算法研究

首先分析了智能天线在CDMA系统中应用,理论分析了通过空间特征向量来对其实现“零陷“,提出采用压低基站的上行干扰提升系统的性能的新算法,实验仿真显示:该算法通过空域滤波,能够显著提高系统性能.