高速机车司机心理选拔指标研究

目的从安全驾驶适应性方面研究高速机车司机应具备的心理素质。方法根据高速列车机车驾驶特性,提出心理选拔指标并应用于现场,通过现场对直达和特快机车司机的测量及应用从而确立高速机车司机应具备的心理素质指标。结果实验机车司机413名,年龄组在39岁以下和40岁以上机车司机有明显不同：39岁以下较40岁以上机车司机的作业能力和反应速度及注意分配、集中、转移等方面的能力均明显加快（P〈0.05,P〈0.01）;机车司机的认知能力受文化程度的影响（P〈0.01）,其中,四数和计算是初中与高中以上文化程度之间有极显著性差异（P〈0.01）,比较刻度、按规律检数是高中以下和大专之间存在着极显著性差异（P〈0.01）,即具备一定文化程度的机车司机其计算速度和操作技能都明显较好。指标间的相关矩阵分析存在极密切关系（r=0.16-0.59,P〈0.01）;同期效标检验各指标的相关效度为0.14-0.33（P〈0.05,P〈0.01）,组合分相关效度为0.315（P〈0.01）;验证预测合格符合率为91.96%,预测淘汰符合率为23.89%。     

齿轮修形在机车上的应用

提出了单侧直齿传动大功率电力机车牵引齿轮的齿向螺旋形就形修正、齿端修薄和齿枯、齿根修缘的计算以及设计方法，运用方法成功地研制的ＳＳ７型电力机车的牵引齿轮，结束了我国大功率电力机车有用双侧斜齿轮传的历史。     

抓斗吊车自动称重系统及其微机模拟调试

本文阐述了吊车自动称重系统的硬件原理及其有关的接口技术,提出了一种简便可行的称重计量方法和相应的软件设计方法,并说叫了微机模拟技术在调试中的作用和过程。     

选择性输出双离合自动变速器液压控制系统设计

液压控制系统是变速器的重要组成部分,油路和阀的设计选择对变速器的动力传递和换挡实现有很大影响。分析了自动变速器液压系统的控制原理,并结合一种新型结构变速器,设计其液压控制系统来满足其换挡和动力传递需要。     

基于LS-DYNA的客车侧翻自动分析

根据ECER66对客车侧翻进行仿真,使用ANSA脚本开发客车侧翻自动分析模块,应用LS-DYNA进行分析,该模块得到验证。应用该模块可提高分析效率,并为流程自动化提供参考。     

湿式双离合器自动变速器换挡规律制定与验证

建立基于油门开度和车速的最佳动力性和最佳经济性换挡规律,根据车辆不同挡位和油门开度,车辆对动力性和经济性要求的不同,对所建立的最佳动力性和经济性换挡规律进行调整,得到综合换挡规律。建立整车仿真模型,完成基于dSPACE的综合换挡规律快速原型试验,验证了综合换挡规律的正确性。     

The dynamic study of locomotives under saturated adhesion

In order to study the dynamic behaviours of locomotives under saturated adhesion, the stability and characteristics of stick–slip vibration are analysed using the concepts of mean and dynamic slip rates. The longitudinal vibration phenomenon of the wheelset when stick–slip occurs is put forward and its formation mechanism is made clear innovatively. The stick–slip vibration is a dynamic process between the stick and the slip states. The decreasing of mean and dynamic slip rates is conducive to its stability, which depends on the W/R adhesion damping. The torsion vibration of the driving system and the longitudinal vibration of the wheelset are coupled through the longitudinal tangential force when the wheelset alternates between the stick and the slip states. The longitudinal oscillation frequencies of the wheelset are integral multiples of the natural frequency of torsion vibration of the driving system. A train dynamic model integrated with an electromechanical and a control system is established to simulate the stick–slip vibration phenomenon under saturated adhesion to verify the theoretical analysis. The results show that increases of the longitudinal axle guidance stiffness and the motor suspension stiffness are beneficial to the stick–slip vibration stability and the locomotive's traction ability. The optimised matching of the longitudinal axle guidance stiffness and the motor suspension stiffness are helpful to avoid longitudinal resonance when the stick–slip vibration occurs.     

Design of a feedback-feedforward steering controller for accurate path tracking and stability at the limits of handling

This paper presents a feedback-feedforward steering controller that simultaneously maintains vehicle stability at the limits of handling while minimising lateral path tracking deviation. The design begins by considering the performance of a baseline controller with a lookahead feedback scheme and a feedforward algorithm based on a nonlinear vehicle handling diagram. While this initial design exhibits desirable stability properties at the limits of handling, the steady-state path deviation increases significantly at highway speeds. Results from both linear and nonlinear analyses indicate that lateral path tracking deviations are minimised when vehicle sideslip is held tangent to the desired path at all times. Analytical results show that directly incorporating this sideslip tangency condition into the steering feedback dramatically improves lateral path tracking, but at the expense of poor closed-loop stability margins. However, incorporating the desired sideslip behaviour into the feedforward loop creates a robust steering controller capable of accurate path tracking and oversteer correction at the physical limits of tyre friction. Experimental data collected from an Audi TTS test vehicle driving at the handling limits on a full length race circuit demonstrates the improved performance of the final controller design.