轮毂电机式纯电动汽车平台的建立

为了顺利地进行轮毂电机式纯电动汽车的性能研究,文章具体描述了其样车实体平台的建立过程。表明该平台选取了内转子电动机减速驱动型电动轮,采用锂电池作为动力源。在传统内燃机式的沙滩车基础上,完成了底盘和车身部分的改造和重布置,并进行了虚拟样机的整车建模。该平台的设计思路符合未来发展的趋势并具有质量轻、结构简单以及成本低的优点,能很好地完成电动汽车控制策略和其他性能的研究任务。     

虚拟理论在船舶工业中的应用——虚拟船厂

针对21世纪世界市场环境的变化和顾客需求的多样性,分析了虚拟企业的理论基础,并将虚拟企业理论应用到船舶工业中,提出了虚拟船厂的概念,研究了其使成技术,并构建了虚拟船厂的框架体系。     

COURIER: A MESSAGING SCHEME IN LARGE-SCALE DVES USING AUTONOMOUS AGENTS

ＶＥＳ ＵＳＩＮＧ ＡＵＴＯＮＯＭＯＵＳ ＡＧＥＮＴＳTX＠郑白玫＠施鹏飞Ｉｎｔｒｏｄｕｃｔｉｏｎ［１～４］Ｃｕｒｒｅｎｔｌｙ，ｄｉｓｔｒｉｂｕｔｅｄＶｉｒｔｕａｌＥｎｖｉｒｏｎｍｅｎｔｓ（ｄＶＥｓ）ａｒｅｈｅａｄｉｎｇｔｏｗａｒｄｌａｒｇｅ－ｓｃａｌｅｓｙ...     

基于虚拟仪器的推力轴承动态性能测试系统研究

虚拟仪器(VI)是计算机技术和传统的仪器技术相结合的产物,是仪器发展的一个重要方向.本文重点介绍了基于虚拟仪器的推力轴承动态性能测试系统,阐述了系统开发过程中测试系统结构和软硬件的设计.     

基于Pro/ENGINEER的汽车变速器虚拟装配仿真技术

虚拟装配仿真作为虚拟制造实施的核心技术之一,其主要任务是用可视化手段研究和解决产品紫可装配性问题。文中在Pro／ENGINEER参数化建模的基础上,应用其二次开发Pro／TOOLKIT技术 通过人机交互界面设计,以某型号的汽车变速器为应用对象,进行装配建模和装配仿真整个虚拟装配过程,从而实现汽车变速器的动态装配仿真。     

基于ADAMS的大型客车空气弹簧前悬架仿真分析与比较

利用虚拟样机技术,在ADAMS软件环境下建立了ZF、DANA和SCANIA3种大型客车空气弹簧前独立悬架的多体运动学计算模型,并进行了刚体运动学和弹性体运动学仿真分析研究。在车轮跳动条件下对这3种大型客车空气弹簧前悬架定位参数的变化规律进行了比较研究,并对后两者的前束角进行了优化设计,为同类型空气弹簧前悬架系统设计提供了参考。     

LINUX虚拟存储浅析

存储管理是LINUX重要内容之一,虚拟内存技术不仅可以提供更多的内存,还提供巨大的寻址空间、内存映射、公平的物理内存分配等。文章介绍了虚拟存储相关机制的部分知识。     

Feasibility of modal expansion for virtual sensing in offshore wind jacket substructures

The present paper investigates the feasibility of modal expansion-based virtual sensing in the context of offshore wind jacket substructures. For this specific application, issues have been reported when expanding wind-driven brace vibrations and wave-driven vibrations in the splash-zone based on a sensor network placed solely above the sea level. These limitations are addressed in this paper by extending the sensor network with sub-sea vibration sensors and a wave radar sensor, which allow for capturing local brace vibration modes and the wave-driven vibration response. The brace expansion is thus improved by including the local brace vibration modes in the expansion basis, while the representation of wave-driven vibrations is improved by including load-dependent Ritz vectors computed based on input from the wave radar sensor. The merit of the proposed extension is explored using a numerical model of an offshore wind turbine supported by a jacket substructure in a simulation setting with different operational and environmental conditions. It is documented that the extended setup provides an improvement in the expansion-based estimation of both wind- and wave-driven vibrations. The former improvement is particularly relevant for operational cases, while the latter is relevant for idling cases. Despite the documented improvements, a systematic reduction in the expansion quality is observed for higher wind speeds in operational cases for both the basic and the extended setup. It is contended that this phenomenon is due to the operational variability of the controller, which violates the fundamental assumption of the structural system being linear and time-invariant.     

The carbon footprint of business travel in the knowledge-intensive service sector

We explore the travel needs and patterns, and the corresponding carbon footprint, of small service organizations during different phases of knowledge-intensive business processes, and compare the results with the priorities given to travel-related goals by staff. We apply a combination of focus group data, mobile positioning, and individual follow-up interviews as study methods. The need for physical travel is determined by a combination of the perceived potential for knowledge creation and transfer offered by each trip, the strength of interpersonal relationships in business networks, and the significance of the travel goal in terms of economic sustainability. The priorities given to travel goals reflect the environmental load of business travel only in domestic contexts, where executing core business processes accounted for the highest carbon footprint. We propose the ways in which the management of business interactions could take into account sociotechnical environment and social recognition of low-carbon communication and travel modes.     

基于虚拟仪器技术的铁路信号嵌入式测试系统

铁路信号对于铁路行车安全至关重要，为此有必要专门研发一套车栽的信号在线实时测试系统。综合运用虚拟仪器、嵌入式及无线接入技术开发的铁路信号车载嵌入式测试系统，具有实时、可靠、功能强大等诸多特征，完全能够满足信号测试的各种需求。该测试系统能在线实时采集各类机车信号、地面信号、轨道电路模拟信号等多种信息，处理后进行显示、存储，并用于分析和模拟仿真回放以测试各运行区段内铁路信号的完好性。就该嵌入式测试系统的硬件组成、软件结构、关键技术及特点进行了详细介绍。