改善铁道车辆的舒适性

通过在铁道车辆走行机构上利用反向质量换向和作用力定向能量输出，来改善铁道车辆舒适性。     

DF8BJ交流传动内燃机车的电传动系统工况分析

介绍了DF8BJ交流传动内燃机车的总体技术参数，电传动系统的技术特点，阐述了机车交流传动系统的牵引工况和制动工况的工作过程。性能试验表明，该车牵引电机、电器的维护工作量大为减少，且牵引性能优良。     

船舶并联式油电混合动力系统设计

随着绿色环保概理念日益深入人心和世界各国对船舶污染物排放标准提高,船舶设计人员正寻求各种方法减少柴油消耗量和排放,油电混合动力船舶结合柴油机推进船和电推船的特点,其在节能减排和降噪方面具有明显优势。本文将并联式油电混合动力系统应用于嘉陵江水域的公务艇,为了提升系统转矩合成器的性能,设计中将行星齿轮内置于合成器中,同时将逻辑门限制控制策略对整个动力系统进行控制管理,有效的发挥了系统的效能。根据计算结果表明,设计船的运行成本和污染物排放量相对同等船型将低了8.6%和10.48%,节能减排效果明显。     

A review of dynamics modelling of friction draft gear

Longer and heavier trains mean larger in-train forces and more complicated force patterns. Practical experience indicates that the development of fatigue failure of coupling systems in long heavy trains may differ from conventional understanding. The friction-type draft gears are the most widely used draft gears. The ever developing heavy haul transport environment requires further or new understanding of friction draft gear behaviour and its implications for train dynamics as well as fatigue damage of rolling stock. However, modelling of friction draft gears is a highly nonlinear question. Especially the poor predictability, repeatability and the discontinuity of friction make this task more challenging. This article reviews current techniques in dynamics modelling of friction draft gears to provide a starting point that can be used to improve existing or develop new models to achieve more accurate force amplitude and pattern predictions.     

A new formulation of the understeer coefficient to relate yaw torque and vehicle handling

The handling behaviour of vehicles is an important property for its relation to performance and safety. In 1970s, Pacejka did the groundwork for an objective analysis introducing the handling diagram and the understeer coefficient. In more recent years, the understeer concept is still mentioned but the handling is actively managed by direct yaw control (DYC). In this paper an accurate analysis of the vehicle handling is carried out, considering also the effect of drive forces. This analysis brings to a new formulation of the understeer coefficient, which is almost equivalent to the classical one, but it can be obtained by quasi-steady-state manoeuvres. In addition, it relates the vehicle yaw torque to the understeer coefficient, filling up the gap between the classical handling approach and DYC. A multibody model of a Formula SAE car is then used to perform quasi-steady-state simulations in order to verify the effectiveness of the new formulation. Some vehicle set-ups and wheel drive arrangements are simulated and the results are discussed. In particular, the handling behaviours of the rear wheel drive (RWD) and the front wheel drive (FWD) architectures are compared, finding an apparently surprising result: for the analysed vehicle the FWD is less understeering than for RWD. The relation between the yaw torque and the understeer coefficient allows to understand this behaviour and opens-up the possibility for different yaw control strategies.     

电控自动变速系统原理分析及应用

以林德正面吊变速系统为例,介绍和分析电控自动变速系统的电路组成及工作原理,并针对实际工作中遇到的典型故障,举例说明检测修理方法.     

空间矢量调制的异步电机直接转矩控制新方案

介绍了一种基于负载角控制的直接转矩控制(DTC)新方法.使用简单方程获得控制算法,既易懂又易实现.利用空间矢量调制可以获得固定开关频率且转矩脉动较小.这种控制方法克服了传统DTC的最大缺陷.结果表明此方法的可行性,它在克服传统方法缺陷的同时获得良好的速度控制带宽.     

集装箱吊具导板机构的改造

针对某型集装箱吊具导板机构故障频发、使用寿命短和维修成本高的弊端,在充分吸收其他吊具导板机构优点的基础上,对其进行了设计改造.使用表明,改造后降低了维修成本,提高了设备的可靠性和作业效率.     

交流传动与交直传动电力机车的技术经济性对比

通过对SS9型机车和DJ型机车在外形、性能、维护及运行成本和收益等方面的对比分析，指出交直传动固有的缺点，说明交流传动是铁路牵引动力发展的方向。     

用于三点式逆变器的脉宽调制控制方法

介绍了用于三点式逆变器的若干控制方法，并阐述了两种改进的ＰＷＭ控制方法，新的ＰＷＭ方法能明显减逆变器输出电压诉谐波分量，试验结果也证实了这是一种降低电机脉动转矩和噪声的有效方法。