未来轿车柴油机噪声的优化

德国亚琛大学内燃机教授与FEV公司共同研究了改善未来轿车柴油机噪声和舒适性的技术可能性。探讨借助于气缸压力导向的燃烧调节及发动机的结构措施,从两方面进行声学优化的技术。发动机试验证实。噪声辐射可明显降低。     

复杂悬跨条件下的管线涡激振动分析(英文)

Spans occur when a pipeline is laid on a rough undulating seabed or when upheaval buckling occurs due to constrained thermal expansion. This not only results in static and dynamic loads on the flowline at span sections, but also generates vortex induced vibration (VIV), which can lead to fatigue issues. The phenomenon, if not predicted and controlled properly, will negatively affect pipeline integrity, leading to expensive remediation and intervention work. Span analysis can be complicated by: long span lengths, a large number of spans caused by a rough seabed, and multi-span interactions. In addition, the complexity can be more onerous and challenging when soil uncertainty, concrete degradation and unknown residual lay tension are considered in the analysis. This paper describes the latest developments and a .state-of-the-art. finite element analysis program that has been developed to simulate the span response of a flowline under complex boundary and loading conditions. Both VIV and direct wave loading are captured in the analysis and the results are sequentially used for the ultimate limit state (ULS) check and fatigue life calculation.     

An Analytical Approach for Assessing the Collapse Strength of an Unbonded Flexible Pipe

This paper presents an analytical scheme for predicting the collapse strength of a flexible pipe, which considers the structural interaction between relevant layers. The analytical results were compared with a FEA model and a number of test data, and showed reasonably good agreement. The theoretical analysis showed that the pressure armor layer enhanced the strength of the carcass against buckling, though the barrier weakened this effect. The collapse strength of pipe was influenced by many factors such as the inner radius of the pipe, the thickness of the layers and the mechanical properties of the materials. For example, an increase in the thickness of the barrier will increase contact pressure and in turn reduce the critical pressure.     

压缩天然气缸内直喷用于小型化发动机的潜力

天然气汽车不仅具有生态学方面的优势,而且更易于满足未来的燃油耗法规。采用天然气缸内直接喷射能够显著改善低速扭矩下的动力特性曲线,从而能获得更好的行驶性能,奥地利维也纳理工大学汽车驱动和汽车技术研究所与Delphi公司在1台3缸发动机上证实了这一点,从而成功地大幅度提高了压缩天然气(CNG)汽车的驾驶乐趣。     

油底壳中传动机油泵的齿形皮带

Volkswagen公司和Dayco公司已合作开发成功一种能在发动机机油中工作的齿形皮带,在柴油机上能替代发动机机油泵的传动链。与链传动相比,这种新型的Dayco技术具有许多优势,如较低的摩擦、良好的声学特性和较轻的质量等,而且,这种齿形皮带传动能被设计得具有与发动机相同的使用寿命。     

全球轻型车统一测试程序对乘用车CO2排放的影响分析

截至2017年，欧盟轻型车排放污染物和油耗的型式核准程序是新欧洲行驶测试循环(NEDC)。该测试在底盘测功机上进行。     

Maritime Safety Through Systems Safety Engineering

1.INTRODUCTION In current semmars and conferences about marine transportation safety and shipping safety, the Internationsl safety Code(ISM)is one of the hot topics. In this paper the authors introduce the concepts Of systems safety engineering(SSE). The historical backgrounds of both ISM and SBE are described. The authors compare the concepts of both ISM and SSE. The advantages of SSE are discussed. The authors also introduce the SSE programme plan and SSE activities. 2.DEFINITIONS OF SAFETY If we look for the definition Of safety in an English dictionary, it tells you that safety is a noun meaning a state of being free from harm or danger. To expand the dictionary definition technically, we might define safety as "A measure that determines to what extend the management, technology and operation of a system is free from danger to life, property and the environment".     

清洁动力装置——GLK级车用发动机

在Mercedes—Benz公司新GLK级车用发动机的开发阶段，驱动系统的集成是一个重要环节。因此，在设计开发的初期，就已将新开发的4缸柴油机与7档自动变速箱7G—TRONIC和标准的全轮驱动装置4MATIC结合并相匹配。     

高速列车用轮对

介绍了自20世纪80年代起法国铁路针对铁道车辆轮对所作的改进工作及其设计依据和标准,强调了高速列车的轮对在设计和生产过程中的特点,包括其安全参数的优化及噪声控制.