Volkswagen公司新型3缸压缩天然气发动机

Volkswagen公司围绕Eco Up轿车开发了新型小型车系列New-Small-Family,配装的1.0L 3缸机是以压缩天然气为燃料运行的,功率为50 kW,新欧洲行驶循环燃油耗仅需2.9 kg天然气,CO2排放量79 g/km。该车型结合应用了准单一驱动与起动-停车系统和制动能量再生技术。     

中国首款采用复合材料的电动汽车白车身

德国慕尼黑Forward工程公司及其子公司KDX设计中心为中国汽车制造商长安汽车公司开发了1款由碳纤维增强塑料(CFK)制成的白车身,并将其用于EadoET型电动汽车上。     

可用于轿车和轻型货车的氢燃料发动机

德国博世公司和奥地利格拉茨理工大学对氢燃料发动机方案的混合气形成、燃烧和废气排放等方面进行了评价。对1台废气涡轮增压汽油机进行了改造,并为其配备了氢燃料直接喷射系统。试验研究表明,通过适度的开发工作,已使该款氢燃料发动机具备了较高的功能性潜力。     

用于提高发动机部件效率的摩擦催化Mo-X-N涂层系统

采用表面涂层是减少内燃机摩擦损失的有效措施之一。在配气机构中,优化挺柱和凸轮轴之间的摩擦接触具有较高的技术潜力。Schaeffler公司提出了1种采用纳米结构的摩擦催化物理气相沉积(PVD)涂层系统,可在受应力作用的表面形成保护性摩擦膜。     

Experimental investigation of TARMAX model for modeling of hydrodynamic forces on cylinder-like structures

A new approach that models lift and drag hydrodynamic force signals operating over cylindrical structures was developed and validated. This approach is based on stochastic auto regressive moving average with exogenous (ARMAX) input and its time-varying form, TARMAX. Model structure selection and parameter estimation were discussed while considering the validation stage. In this paper, the cylindrical structure was considered as a dynamic system with an incoming water wave and resulting forces as the input and outputs, respectively. The experimental data, used in this study, were collected from a full-scale rough vertical cylinder at the Delft Hydraulics Laboratory. The practicality of the proposed method and also its efficiency in structural modeling were demonstrated through applying two hydrodynamic force components. For this purpose, an ARMAX model is first used to capture the dynamics of the process, relating in-line forces provided by water waves;secondly, the TARMAX model was applied to modeling and analysis of the lift forces on the cylinder. The evaluation of the lift force by the TARMAX model shows the model is successful in modeling the force from the surface elevation.     

SAW焊接型剖面预报的模糊逻辑系统开发(英文)

A fuzzy model was presented to predict the weldment shape profile of submerged arc welds(SAW) including the shape of heat affected zone(HAZ).The SAW bead-on-plates were welded by following a full factorial design matrix.The design matrix consisted of three levels of input welding process parameters.The welds were cross-sectioned and etched,and the zones were measured.A mapping technique was used to measure the various segments of the weld zones.These mapped zones were used to build a fuzzy logic model.The membership functions of the fuzzy model were chosen for the accurate prediction of the weld zone.The fuzzy model was further tested for a set of test case data.The weld zone predicted by the fuzzy logic model was compared with the experimentally obtained shape profiles and close agreement between the two was noted.The mapping technique developed for the weld zones and the fuzzy logic model can be used for on-line control of the SAW process.From the SAW fuzzy logic model an estimation of the fusion and HAZ can also be developed.     

EcoTough~——抗磨损、低摩擦的活塞裙部涂层

发动机的小型化趋势以及直喷、增压等先进技术的应用,使得汽油机的运行工况越来越恶劣,发动机需要长时间运行于高效率、高负荷工况。随着当今汽车起停技术的快速应用,发动机也需要在高温高压以及非常小的许用油膜厚度运行条件下高效地运行。更具挑战性的是,在城市工况运行时发动机的频繁起动,使发动     

农民合同工挑起水运大梁闯市场——射阳县航运公司的调查

<正> 现状:令人满意 射阳县航运公司是从事华东6省1市内河大宗散装物资运输的水运企业,拥有2074名职工,固定资产3400万元,钢质系列化船队25个,拖轮29艘,货驳309艘,载重量32748吨,运输能力雄居全省县(市)级水运企业之首。     

船用柴油机缸套强烈侵蚀的主要原因及其消除方法

本文讲述苏联中央柴油机研究所研究船用柴油机缸套与冷却水相接触的一边遭到侵蚀的原因,得出侵蚀是由于受到缸套振动的作用,而振动产生的基本原因是活塞在通过上死点时对缸套撞击的结果,所以要适当地选择活塞与汽缸间的间隙。最后提出防止缸套侵蚀作用的措施。