基于有限元法的QY25汽车起重机转台的分析和改进设计

以ANSYS为有限元分析平台，运用自下而上建模技术建立有限元模型，确定计算工况并进行计算工况下的有限元静力学计算，在计算结果的基础上，提出结构改进方案并进行了验证计算。     

求网络图时间参数及线路的表上简易计算方法

针对网络图双代号时间参数及线路的计算方法，提出在表上计算方法中，采用在专用表中设置明，暗节点和索引计算式的方法，从而找到了求解时间参数及采用截面法求解全部线路的简易计算方法。     

轿车外气动计算的新进展

综合分析了国内轿车外气动计算技术的发展、应用情况，以及国内外近年来在计算流体力学（CFD），网格技术，软件工程，网格计算技术等相关学科的最新成果，展望了轿车外气动计算的发展方向和前景。     

伤残程度等级划分与伤残赔偿计算研究

采用数学方法计算单处和多处伤残的赔偿数额。根据伤残程度等级划分和赔偿过错系数，建立伤残赔偿计算数学模型。应用所建立的伤残赔偿计算宁数学模型，可以直接计算单处或多处伤残的赔偿数额。伤残赔偿计算数学模型，在一定的法律规定条件下，可以准确的计算人体伤残赔偿数额，方法简便。     

汽油机燃烧产物物性计算的一种简化方法

本文提出一种计算汽油机燃产物热力学特性的简化方法，介绍了该方法的导出过程，并对简化计算式进行了验证计算及误差分析。计算结果表明，该方法在一定的温度范围内（５００－２８００Ｋ），对燃气热物性的计算有较好的精度。     

管片式散势器在汽车发动机冷却系匹配设计中的数值模拟

本文介绍了一种散热器性能的计算模型和在系统中系统中如何匹配的优选模型，编制了计算程序，进行了计算与实验的对比分析，表明计算方法是合理的。     

轻型拱桥活载内力分析的一种实用计算方法

提出了刚架拱桥活载内力计算的一种实用方法——分离变量法，在横向分布系数的计算中，考虑了横向分布影响线沿桥跨纵向的变化。通过大量数值计算，探讨了横向分布系数沿桥跨纵向的分布规律，在此基础上，提出了拱桥活载内力分析的简化计算方法，可供工程设计时参考。     

Excel在道路中线逐桩坐标计算中的应用

不论是在铁路还是公路的设计和建设中都不可避免地遇到大量的曲线计算。城市轻轨、地下铁道、水建工程等大型工程亦是如此。红外测距仪、全站仪的广泛应用，使得坐标法曲线放样的应用更加广泛。手工计算器计算，耗时、费人且易出错。数据处理软件——Excel——具有强大的计算功能，将其应用于曲线计算，会极大地节约计算量，简化计算过程，起到事半功倍的作用。结合工程实例，介绍了相应的计算方法。     

桥墩（台）作为基础梁的计算

目前基础梁计算方法有三种，计算结果相差颇大，应根据具体情况选用。在公路桥梁设计中，以往较多采用的是文克尔假定计算法。在基岩理置较深的土基上的墩（台）或涵洞按文克尔假定计算显然是不适合的，应按地基为半无限大体假定进行计算。本文介绍按弹性理论假定计算基础梁的方法，并通过算例对三种方法计算结果加以比较。供应用参考。     

手动变速器换档行程设计分析

手动变速器的换档行程是根据整车设计要求并结合行业相关标准确定的一个外联接参数，该参数是整车操纵性能一个重要的评价指标，本文通过对换档行程构成因素和不同种类的换档定位方式特点分析，以便为设计中根据不同的换档定位方式选择提供依据，并在设计中针对不同的换档定位方式需注意的部分提出了相应的想法，在此基础上，分别进行了拨叉的换档行程计算，同步器齿套的换档行程计算，同步器齿套与同步结合齿的重叠度计算，本计算过程有别于传统的尺寸链算法，根据计算模式可在EXCEL中建立通用表格，为手动变速器总成设计计算建立一个平台。     

浅谈城市桥梁造型美学

城市桥梁造型美学是城市的景观特色,也是城市道路交通安全的重要影响因素。文中就城市桥梁组成研究了桥梁造型美学设计要求,提出了城市桥梁美学与城市协调的处理方法,对改善城市景观、美化城市环境,起到了重要作用。     

Boundary conditions of active steering control of independent rotating wheelset based on hub motor and wheel rotating speed difference feedback

The source of torque ripple in a permanent-magnet synchronous motor was analysed. Based on the feedback of the rotating speed difference between the left and right wheels, the error value of torque ripple in an in-wheel motor was calculated. Next, a simulation model of active steering control of an independently rotating wheel (IRW) in an in-wheel motor was developed to investigate effects of torque ripple. The relationship between the accuracy of active steering control of an IRW in an in-wheel motor and wheel/rail profile was derived, and then the boundary conditions of active steering control were obtained. Finally, a method was proposed to improve the active steering control of an IRW by optimising the tread.     

浅谈利用ETC技术进行交叉口信号灯智能控制的优化

提出了一种利用ETC技术进行城市道路交叉口信号灯智能控制的优化措施,利用ETC设备的现有功能,通过收集交叉口等候车辆的信息,经计算机中心处理后,予以智能化控制,缩短交叉口车辆等候时间,提高道路通行效率。     

基于行人仿真的行人过街设施方案设计及评价

步行交通是城市居民最主要的交通出行方式,如何构建安全、便捷的行人过街系统已成为构建以人为本、和谐的城市交通系统的重要方面。以北京市CBD地区西大望路上的1个路段为例,利用Vissim软件对其进行机动车、行人、自行车的模拟仿真,选取延误作为评价指标,通过方案比选确定了人行地道的位置,并对方案实施前后的效果进行分析。     

特重车通过大跨石拱桥安全评定及加固措施研究

以一质量达340t的特重车通过白水港一桥项目为背景,考虑到按常规荷载等级设计的旧石拱桥的承栽力一般难以满足超重荷栽通行的要求,时特栽通行的可行性进行了安全评定.通过现场静、动荷载试验,评估了桥梁的整体刚度和强度,并结合试验结果,利用桥梁通用有限元软件分别建立单梁模型和实体模型进行结构承载能力检算及动力特性分析.综合桥梁...     

Coupled vibration analysis of Maglev vehicle-guideway while standing still or moving at low speeds

Dynamic instability, that is, resonance, may occur on an electromagnetic suspension-type Maglev that runs over the elevated guideway, particularly at very low speeds, due to the flexibility of the guideway. An analysis of the dynamic interaction between the vehicle and guideway is required at the design stage to investigate such instability, setting slender guideway in design direction for reducing construction costs. In addition, it is essential to design an effective control algorithm to solve the problem of instability. In this article, a more detailed model for the dynamic interaction of vehicle/guideway is proposed. The proposed model incorporates a 3D full vehicle model based on virtual prototyping, flexible guideway by a modal superposition method and levitation electromagnets including feedback controller into an integrated model. By applying the proposed model to an urban Maglev vehicle newly developed for commercial application, an analysis of the instability phenomenon and an investigation of air gap control performance are carried out through a simulation.     

Extended-Kalman-filter-based regenerative and friction blended braking control for electric vehicle equipped with axle motor considering damping and elastic properties of electric powertrain

Because of the damping and elastic properties of an electrified powertrain, the regenerative brake of an electric vehicle (EV) is very different from a conventional friction brake with respect to the system dynamics. The flexibility of an electric drivetrain would have a negative effect on the blended brake control performance. In this study, models of the powertrain system of an electric car equipped with an axle motor are developed. Based on these models, the transfer characteristics of the motor torque in the driveline and its effect on blended braking control performance are analysed. To further enhance a vehicle's brake performance and energy efficiency, blended braking control algorithms with compensation for the powertrain flexibility are proposed using an extended Kalman filter. These algorithms are simulated under normal deceleration braking. The results show that the brake performance and blended braking control accuracy of the vehicle are significantly enhanced by the newly proposed algorithms.     

Artificial intelligence for traffic signal control based solely on video images

Learning-based traffic control algorithms have recently been explored as an alternative to existing traffic control logics. The reinforcement learning (RL) algorithm is being spotlighted in the field of adaptive traffic signal control. However, no report has described the implementation of an RL-based algorithm in an actual intersection. Most previous RL studies adopted conventional traffic parameters, such as delays and queue lengths to represent a traffic state, which cannot be exactly measured on-site in real time. Furthermore, the traffic parameters cannot fully account for the complexity of an actual traffic state. The present study suggests a novel artificial intelligence that uses only video images of an intersection to represent its traffic state rather than using handcrafted features. In simulation experiments using a real intersection, consecutive aerial video frames fully addressed the traffic state of an independent four-legged intersection, and an image-based RL model outperformed both the actual operation of fixed signals and a fully actuated operation.     

基于微分几何理论的汽车半主动悬架非线性振动控制

针对汽车悬架系统的非线性特性,采用1／4汽车二自由度悬架模型分析半主动悬架控制。应用微分几何理论得到输出-干扰解耦方法,再经适当的坐标变换将该模型由非线性系统简化成一线性系统,并对此系统进行最优控制,然后通过非线性状态反馈实现对原系统的半主动控制。与被动悬架的仿真结果进行了比较,表明这种针对具有非线性特征的半主动悬架的非线性控制方法是可行的。通过功率谱分析,控制后系统的能量比被动悬架更趋于平均,悬架动态性能更稳定。     

板料U形弯曲模智能CAD系统

基于设计型专家系统及Auto CAD ActiveX开发技术，建立了板料U型弯曲模智能CAD系统的功能模型，包括产品信息模块、工艺设计模块、模具结构设计模块、成型分析模块等，使模具设计过程集成化。开发的板料U型弯曲模智能CAD系统，具有友好的图形界面和方便的菜单界面，可实现原始图形文件的选择，完成交互方式数据预处理，具有自动设计或按任务层次执行的干预设计功能，最终以图形文件和数据文件的形式输出结果。该系统为模具设计自动化提供了一条实用、可靠和高效的途径。