Solving Nonlinear Differential Equation Governing on the Rigid Beams on Viscoelastic Foundation by AGM

In the present paper a vibrational differential equation governing on a rigid beam on viscoelastic foundation has been investigated. The nonlinear differential equation governing on this vibrating syst...     

后桥钢板激光-MIG复合焊接优化研究

研究了两种后桥桥壳用低合金钢板在激光-MIG复合焊接中,接头形状、接头间隙及MIG参数变化(大、中、小MIG参数)对焊缝形状及焊缝喉厚的影响.研究结果表明,MIG参数应设置成大、中MIG参数水平,以保证在一定的接头间隙下有充足的焊接材料填入间隙而形成部分焊透的焊缝,使焊缝喉厚满足焊接强度要求;过高的MIG输入能量和过多的焊料(丝)填入将导致焊缝横截面积增大,但对焊缝喉厚的影响不是很明显;当MIG参数设置成小MIG参数水平时,0.5 mm的接头间隙或切角面为3 mm×2 mm时,对获得较大的焊缝喉厚有利.     

Experimental study of the flow induced by a vehicle fan and the effect of engine blockage in a simplified model

Fans are often tested without downstream blockage and, thus, the performance is considerably different when the fan is mounted in a vehicle as part of a cooling system and where high blockage effect is present downstream. The aim of the present work is to analyze by laser Doppler velocimetry LDV measurements the topology of the flow induced by a fan incorporated in a simplified underhood model reproducing engine blockage and to study the blockage effect of the engine positioning on the flow induced by the fan. The distance between the fan and the engine block affects the mean flow axial velocity U. The vertical velocity component W is greatly influenced by the variation of the distance between the fan and the engine block, both in magnitude and topology.     

Investigation of regenerative and Anti-lock Braking interaction

The use of a regenerative braking mode can reduce overall vehicle energy usage for most of the most common drive cycles. However, a number of technical issues restrict the use of regenerative braking for all possible braking situations. These issues are concerned with two key limitations. The first is related to physical limitations of the applied regenerative braking system, e.g. Electric Motor (E-Motor) power limits; energy storage device capacity and vehicle load transfer etc. The second limitation results from the potentially detrimental interaction between regenerative braking and the Anti-locking Braking System (ABS). The first type of limitation can, to some extent, be alleviated by suitable choice of hardware and, as a consequence, will not be discussed further in this paper. The second type of limitation concerns the regenerative braking strategies during an ABS event. Some of the regenerative braking strategies designed and investigated within the Low Carbon Vehicle Technology Project (LCVTP) will be described and analyzed in this paper. A comparison of competing strategies is made and conclusions are drawn together with suggestions for further research. The work has been progressed as a part of a major research programme; namely the LCVTP, which has been conducted within an extensive industrial and academic partnership, mutually funded by the European Regional Development Found and Advantage West Midlands.     

新型轮对检测仪表

目前,机务段用以测定机车轮对轮箍磨损的检测工具一般都为机械检测工具,例如量规和卡规等等.为了对轮对的滚动面(踏面)作有效而精确的检测,国立乌拉尔交通学院与传感器信息工艺学院的专家们研制出了1种新的仪表.     

电力牵引用线性助推器方案

基于轮轨系统电力牵引的力传递与轮轨接触点的粘着系数有关.差的轨面状态会降低可传递的牵引力.现可用各种不同的助推器来产生附加分力,以补偿损失的牵引力.     

Power Spectral Density of Road Profiles

The road profile is usually considered to be a random process x ( d ), where x is the road height and d is the distance along the road. As the vehicle travels along the road with velocity v , the random process x ( d ) is converted to a random process x ( t ) which is input to the vehicle suspension via the tyre. The random process x ( d ) is usually described in terms of its power spectral density as a function of frequency in either radians or cycles per unit distance. However, there are several different ways of defining power spectral density, and this makes it difficult to compare published data without knowing how the power spectral density has been defined. The proper calculation of RMS values of vehicle response for an assumed road power spectral density is explained by an example.