法兰环件轧制变形规律和毛坯设计方法

本文分析了矩形截面环件轧制变形规律,并以此为基础研究了法兰环件轧制变形规律,证明了法兰环件轧制中存在轴向金属流动。根据法兰环件轧制变形特点,提出了法兰环件轧制用毛坯的设计原理和设计方法,进行了实例设计计算。通过与实际轧制用法兰毛坯相比较,证明了本文的设计方法是适用的。     

优选法在汽车齿轮辗扩工艺试验中的应用

分析了ＥＱ１４０型汽车差速器从动齿轮锻件辗扩变形特点和辗扩用毛坯设计中的主要问题，阐明了辗扩用毛坯优选法设计的原理和计算过程，应用优选法指导ＥＱ１４０型汽车差速器从动齿轮扩工艺试验，可使试验次数大为减少。     

智能互联汽车远程诊断测试平台开发

远程诊断系统让主机厂在后台得到并分析车辆售后相关数据,并为车主提供远程服务,其依赖于车辆通信模块和全车控制器的协作。Vector总线开发工具CANoe可以实现虚拟节点和真实节点相结合的仿真。利用该工具,将整车部分控制器和虚拟控制器相结合,搭载远程诊断测试平台。通过测试平台,可以在整车项目前期,对远程诊断的功能进行验证,提高整车开发效率,同时能够同步协助智能互联IT平台的开发工作。     

货车典型结构有限元多媒体示范库研制

齐车集团公司与大连铁道学院机械工程研究所联合研制开发了货车典型结构有限元多媒体示范库。该示范库主要由三部分组成：支持工厂产品设计的有限元基础知识;工厂典型产品有限元建模的关键技术及成功经验;工厂典型产品有限元分析计算实例。这些实例不仅涉及到静力分析、模态分析、动力响应,还涉及到弹塑分析、接触分析、热分析、疲劳分析乃至优化设计。该示范库以图声并茂的多媒体形式开发,并可在ＩＥ浏览器上阅读与下载。它将     

解析铁道行业标准《机车车辆用材料阻燃技术要求》

介绍TB/T 3138—2018《机车车辆用材料阻燃技术要求》的修订背景、修订原则,重点分析取样要求、保温材料、通用橡胶材料、烟密度试验和45°角燃烧试验等主要修订内容。根据我国机车车辆防火标准体系规划,提出TB/T 3138—2018标准实施建议,以便标准使用者更好地理解和实施TB/T 3138—2018。     

多轴车桥耦合振动模型的Fourier级数求解方法分析

文章以某高速公路40m简支T梁为研究对象,基于结构动力学原理推导了多轴车桥耦合振动系统的系统振动微分方程,并求解出微分方程时变激振力的Fourier级数表达式,同时基于模态叠加法得出结构动力响应的解析表达式,对该简支T梁在不同过桥车速、不同车辆车轴布置以及不同车辆车轴超重情况下的结构动力响应进行参数分析。     

Rolling horizon stochastic optimal control strategy for ACC and CACC under uncertainty

This paper presents a rolling horizon stochastic optimal control strategy for both Adaptive Cruise Control and Cooperative Adaptive Cruise Control under uncertainty based on the constant time gap policy. Specifically, uncertainties that can arise in vehicle control systems and vehicle sensor measurements are represented as normally-distributed disturbances to state and measurement equations in a state-space formulation. Then, acceleration sequence of a controlled vehicle is determined by optimizing an objective function that captures control efficiency and driving comfort over a predictive horizon, constrained by bounded acceleration/deceleration and collision protection. The optimization problem is formulated as a linearly constrained linear quadratic Gaussian problem and solved using a separation principle, Lagrangian relaxation, and Kalman filter. A sensitivity analysis and a scenario-based analysis via simulations demonstrate that the proposed control strategy can generate smoother vehicle control and perform better than a deterministic feedback controller, particularly under small system disturbances and large measurement disturbances.     

Dynamic green bike repositioning problem – A hybrid rolling horizon artificial bee colony algorithm approach

This paper introduces a new dynamic green bike repositioning problem (DGBRP) that simultaneously minimizes the total unmet demand of the bike-sharing system and the fuel and CO₂ emission cost of the repositioning vehicle over an operational period. The problem determines the route and the number of bikes loaded and unloaded at each visited node over a multi-period operational horizon during which the cycling demand at each node varies from time to time. To handle the dynamic nature of the problem, this study adopts a rolling horizon approach to break down the proposed problem into a set of stages, in which a static bike repositioning sub-problem is solved in each stage. An enhanced artificial bee colony (EABC) algorithm and a route truncation heuristic are jointly used to optimize the route design in each stage, and the loading and unloading heuristic is used to tackle the loading and unloading sub-problem along the route in a given stage. Numerical results show that the EABC algorithm outperforms Genetic Algorithm in solving the routing sub-problem. Computation experiments are performed to illustrate the effect of the stage duration on the two objective values, and the results show that longer stage duration leads to higher total unmet demand and total fuel and CO₂ emission cost. Numerical studies are also performed to illustrate the effects of the weight and the loading and unloading times on the two objective values and the tradeoff between the two objectives.     

对欧洲标准油压减振器测试规定的理解

根据对欧洲标准对测试机车车辆油压减振器的规定的理解,调查我国现有的减振器测试现状与检测各种试验台正弦激振精度后,找出差距,提出减振器测试中需试验台具备自测驱动精度、多点测试的发展目标。     

机车车辆油压减振器理论和实践上的现状与问题

围绕机车车辆油压减振器的生产与使用中漏油、线性阻尼系数、多点测试、速度点概念及发展阶段性5个方面,从理论与实践结合的层面上,理性看待现状,找出问题,以利发展。