试漏技术在自动变速器生产中的应用

日趋激烈的市场竞争对自动变速器的质量水平提出越来越高的要求。而当前自动变速器市场问题主要集中在异响、漏油及振动噪声三大问题。文章通过从试漏原理以及关键参数设定等方面,对自动变速器生产过程中的试漏检测进行分析。     

丰田燃料电池汽车Mirai技术分析

燃料电池汽车因具有零排放、续驶里程长、燃料加注快和噪声低等优势,引起了国内外汽车产商的广泛关注,将燃料电池新能源汽车作为研发的重点,并推出了一些量产的燃料电池汽车。基于丰田Mirai燃料电池汽车,对其技术原理和核心总成部件进行了综述分析,并对燃料电池汽车的发展方向和关键技术问题进行了思考和建议,为读者提供了有益的参考和借鉴。     

Experimental and numerical study of containership responses in severe head seas

An accurate determination of the global load effects in a ship is vital for the design of the vessel. This paper addresses an experimental and numerical study of containership responses in severe head seas. Experimental results were obtained using a flexible model of a containership of newer design. The experiments showed that, taking hull flexibility into account, the fourth and sixth harmonic of the vertical bending moments had a maximum value of between 25% and 50% of the first harmonic. We also demonstrated that hull flexibility can increase the vertical bending moment by up to 35% in sea states relevant for design. Comparisons of moments found experimentally with results from a nonlinear hydroelastic strip theory method showed that the effect of nonlinearities on the rigid body moments was slightly over-predicted in the aft body. The method also tends to over-predict the increase of the bending moments due to hull flexibility. In general however, the numerical results compared reasonably well with the experimental ones.     

道路交通事故紧急救援保障体系与技术支持

我国汽车保有量仅占全球汽车保有量的3%,而每年死于交通事故的人数约占全球死于交通事故人数的15%20%,尤其交通事故致死率是日本等国家的1020倍。本文就此现象进行基本原因的分析,并着重对交通事故紧急救援保障体系与技术支持问题进行探讨。     

Numerical and experimental investigations into the application of response conditioned waves for long-term nonlinear analyses

The coefficient of contribution method, in which the extreme response is determined by considering only the few most important sea states, is an efficient way to do nonlinear long-term load analyses. To furthermore efficiently find the nonlinear short-term probability distributions of the vessel responses in these sea states, response conditioned wave methods can be used. Several researchers have studied the accuracy of response conditioned wave methods for this purpose. However, further investigations are necessary before these can become established tools. In this paper we investigate the accuracy by comparing the short-term probability distributions obtained from random irregular waves with those from response conditioned waves. We furthermore show how response conditioned wave methods can be fitted into a long-term response analysis. The numerical and experimental investigations were performed using a container vessel with a length between perpendiculars of 281 m. Numerical simulations were done with a nonlinear hydroelastic time domain code. Experiments were carried out with a flexible model of the vessel in the towing tank at the Marine Technology Centre in Trondheim. The focus was on the probability distributions of the midship vertical hogging bending moments in the sea states contributing most to the hogging moments with a mean return period of 20 years and 10 000 years. We found that the response conditioned wave methods can very efficiently be used to accurately determine the nonlinear short-term probability distributions for rigid hulls, but either accuracy or efficiency is to a large effect lost for flexible hulls, when slamming induced whipping responses are accounted for.     

网络布线系统设计与实践

详细描述网络布线系统设计中网络布线系统的结构选型;网络布线系统的标准、产品的选型;电缆的选择以及网络系统的防雷措施,这些设计原则已应用在宜昌市建设工程交易中心信息发布等网络布线系统中,效果甚好.     

软土地基满堂支架现浇梁施工质量控制

介绍上承式移动模架的构造、施工特点及工作原理,提出了模架施工中几个关键环节的施工措施,针对上乘式移动模架施工特点提出了混凝土浇筑、预应力张拉、线性控制方面应注意的一些问题,保证了模架施工质量.     

形式美在汽车灯具产品设计中的应用

汽车灯具产品的设计已从对功能的需求扩展到对美的追求,因而懂得美学已成为产品设计者的一项基本要求。本文简述审美及形式美的概念,列举一些形式美的常见形式,论述形式美在汽车灯具产品设计中的应用和具体表现。     

CANoe/MATLAB联合仿真在纯电动汽车整车控制开发中的应用

为搭建纯电动汽车整车控制器的总线仿真环境,利用CANoe/MATLAB接口模块将CANoe完善的总线仿真功能和MATLAB/Simulink的建模仿真功能结合起来,实现了整车控制单元模型、电机控制单元模型和电源管理控制单元模型在CANoe环境下的联合仿真。仿真结果表明,采用CANoe/MATLAB联合仿真可以对整车总线应用层协议和整车控制策略进行验证。     

船舶燃用低硫燃油的问题分析与系统设计

随着人类对环境保护的日益重视及规范规则的强制执行,要求越来越多的船舶在规定的区域内使用含硫量不大于0.1%m/m的低硫油。介绍了国际海事组织和各船级社对船舶柴油机排放物中含有硫氧化物的规定,并举例对船舶燃油系统的设计作一介绍。