The effects of wheelset driving system suspension parameters on the re-adhesion performance of locomotives

In this study, in order to examine the effects of a wheelset driving system suspension parameters on the re-adhesion performance of locomotives, the stick–slip vibration was analysed according to theoretical and simulation analysis. The decrease of the slip rate vibration amplitude improved the stability of the stick–slip vibration and the re-adhesion performance of locomotives. Increasing the longitudinal guide stiffness of the wheelset and the motor suspension stiffness were proposed as effective measures to improve the re-adhesion performance of locomotives. These results showed that the dynamic slip rate was inversely proportional to the series result of the square root of the longitudinal guide and motor suspension stiffness. The larger the motor suspension stiffness was, the smaller the required longitudinal guidance stiffness was at the same re-adhesion time once the wheel slip occurred, and vice versa. The simulation results proved that the re-adhesion time of the locomotive was approximately proportional to amplitude of the dynamic slip rate. When the stick–slip vibration occurred, the rotary and the longitudinal vibrations of the wheelset were coupled, which was confirmed by train's field tests.     

Suburban attitudes toward policies aimed at reducing solo driving

Policies that are aimed at discouraging commuters from solo driving have become a part of overall efforts to improve air quality and reduce traffic congestion. Since driving alone is the overwhelming choice of employed residents in US metropolitan areas, the political acceptability of proposed policy changes plays a role in their success. The 1992 Orange County (CA) Annual Survey asked employed solo drivers to rate their likelihood of changing from solo driving in response to various fees and incentives. Fewer say they would be very likely to stop solo driving if they were charged a parking fee at work (20%), a smog fee (17%) or a congestion fee (16%), than if their employers paid them a cash bonus for stopping solo driving (28%), or if more public transit (33%) or more carpools at work (35%) were available. Young and lower-status solo drivers are more likely than others to say they would stop driving alone if there were fees or cash bonuses. Current non-solo drivers tend to be young and low income, providing a validity check on the demographic predictors of stated preferences. The findings are discussed in light of recent policy changes in Southern California.     

ISG hybrid powertrain: a rule-based driver model incorporating look-ahead information

According to European regulations, if the amount of regenerative braking is determined by the travel of the brake pedal, more stringent standards must be applied, otherwise it may adversely affect the existing vehicle safety system. The use of engine or vehicle speed to derive regenerative braking is one way to avoid strict design standards, but this introduces discontinuity in powertrain torque when the driver releases the acceleration pedal or applies the brake pedal. This is shown to cause oscillations in the pedal input and powertrain torque when a conventional driver model is adopted. Look-ahead information, together with other predicted vehicle states, are adopted to control the vehicle speed, in particular, during deceleration, and to improve the driver model so that oscillations can be avoided. The improved driver model makes analysis and validation of the control strategy for an integrated starter generator (ISG) hybrid powertrain possible.     

盘式制动器性能试验台模拟机的研制

对盘式制动器工作原理及试验原理进行了研究，研制开发出了盘式制动器性能试验台模拟机。介绍了模拟机主机部分的设计，实现飞轮组的多片组合，设计出驱动制动系统和单片机测试系统，以保证系统的模拟精度。     

绞吸挖泥船轴扭矩及功率测试

针对绞吸挖泥船轴扭矩及功率测试的问题,进行了现场测试和泥泵性能试验,介绍了一种绞吸挖泥船轴扭矩及轴功率测试试验装置。采用船舶应变片式轴功率测量方法,得出泥泵在850、900、950、1 000 r/min共4个转速下的泥泵性能参数;并对柴油机在945 r/min转速下,油门刻度18时的瞬时扭矩和平均扭矩进行计算。得出结论：在流量不变的情况下,泵的转速越高,扬程越高、功率越高;在流速在1~1.51 m3/s时,泥泵在4个转速下的水功率十分接近;随着流量的增大,转速越大,泵的水功率越高。     

人机混驾环境下基于深度学习的车辆切入轨迹预测

为保证人机混驾环境下自动驾驶汽车的安全行驶,对周围车辆切入轨迹的预测至关重要.本文首先使用Savitzky-Golay滤波器对大规模采集的自然驾驶数据进行去噪处理,根据准则提取车辆切入片段,建立符合中国道路状况的车辆切入数据集.其次,发挥Bi-LSTM网络能充分利用上下文信息的优点和in-out快捷连接有效减少梯度消失...     

转矩传感器磨损造成汽车跑偏的原因分析

针对市场某车型基本存在转向左跑偏的现状,根据转矩传感器的原理,对转矩传感器的主要部件尺寸进行测量分析,找出跑偏的原因,并模拟试验进行验证。     

盾构刀盘中心区域磨损研究

文章介绍了刀盘中心区域磨损的原因,并对结泥饼引起的扭矩变化进行了分析。通过工程实例对比指出,在刀盘中心区域加装搅拌棒是比较有效的解决方案。     

GPS-based optimization of plug-in hybrid electric vehicles’ power demands in a cold weather city

Using the WPG03 duty cycle developed from global positioning data collected in Winnipeg, Canada, real world energy demands and costs are modeled. Three types of plug-in hybrid electric vehicles, four temperatures and two charging scenarios are compared to a vehicle with an internal combustion engine. Cold temperatures are shown to greatly affect vehicle operation energy costs, which is an important consideration for cold weather cities such as Winnipeg. The largest energy cost savings are obtained for smaller-battery plug-in hybrids that had the opportunity to charge during the day.