基于Pro/E的发动机配气机构参数化设计

本设计利用Pro/E的二次开发工具对直接驱动、双凸轮轴上置式配气机构进行了参数化建模.利用在大型产品建模中应用非常广泛的骨架功能,搭建了配气机构的骨架模型,并根据骨架模型创建和装配各元件,成功实现了此配气机构结构与尺寸的参数驱动.通过修改参数值,就可以生成一簇在结构形式上相似的配气机构模型.该方法大大提高了设计人员的工作效率,缩短了开发周期.     

基于模糊神经网络的铁路车辆热轴等级判别模型

判别模型。该模型选定了温升、列温升差、辆温升差3个特征作为输入量,4种热轴等级作为输出量,并利用125条模糊推理规则和学习算法对模糊神经网络进行训练,得到的模糊神经网络可作为专家系统对热轴进行判别。实例仿真结果表明:模糊神经网络热轴判别模型使得判别参数减少,判别科学化,且判别的一致率达到95%。     

列车供电系统的设计与选型

为了提高列车供电系统的功率因数,减小输出电压的波动,对主电路提出了基于"二极管不控整流+IGBT降压斩波"的设计。通过对主电路的PSIM仿真,表明该电路能够使DC600V电源的功率因数提高到0.9以上,而且使输出电压稳定在600V左右,达到了设计目的。最后对主要器件进行了选型设计,为今后铁路技术部门对列车供电系统的具体改造提供初步方案和技术支持。     

基于无线Mesh网络技术的旅客列车宽带网络设计研究

随着高速铁路交通的发展,信息网络的移动接入技术需要得到相应的改善和提高。根据公共移动通信网和铁路专用移动通信网的发展现状,本文提出了一种基于无线Mesh网络技术的旅客列车服务宽带网络的设计方案,分析了网络结构、关键技术以及网络的应用场景。     

Physical,mental, emotional,and subjective workload components in train drivers

This study, using 12 train drivers on a high speed track and 11 drivers on a mountain track, tried to differentiate between the physical, emotional, mental, and subjective workload components imposed on the drivers during work. With the simultaneous recording and on-line analysis of heart rate and physical activity, the emotional component in terms of the so-called additional heart rate was separated from the physical component. Mental workload was calculated by the heart rate variability and by shifts in the T-wave amplitude of the ECG. Speed of the train, mode of driving, and stress of the situation were rated by two observers who accompanied the drivers in the cabin. During speeds up to l00km/h as compared to standstills no heart rate changes occurred, but with speeds from l00km/h up to 200 km/h heart rate decreased indicating a monotony effect. However, heart rate variability, and T-wave amplitude indicated higher mental load during driving in most speed categories. Starting the train and coming to a halt showed greater emotional workload as compared to moving. Observer ratings of stress and subjective ratings of stress by the drivers revealed several discrepancies. Discrepancies were also seen between workload as indicated by the physiological parameters, and corresponding stress ratings by the observers or by the drivers.     

Multi-route railroad blocking problem by improved model and ant colony algorithm in real world

In rail freight transportation, general merchandise freight cars may pass through many classification stations on their route from origin to destination. The Railroad Blocking Problem (RBP) is to reclassify inbound traffic from various origins in the classification stations and put them on outbound trains with the same or close destinations, the objective of the RBP is to minimize the total operating costs of delivering all traffic on the railway network while satisfying the resource and capacity constraints at the stations and the priority constraints for shipments. In this paper, we introduce a new mathematic model which can comprehensively describe the blocking strategy and various combinations of multi-route O–D pairs in large scale railway network. Furthermore, we propose an improved Ant Colony (AC) algorithm for RPB, and a computational experiment derived from the real life instances of coal heavy haul rail network in north China is given. Experimental results verified the validation of the model and effectiveness of the algorithm.     

Test run of combined propulsion,levitation and guidance system at Miyazaki test track

In commercializing the superconducting Maglev system it is important to reduce the cost, especially that of ground coils constructed along the whole length of the guideway. For this purpose we have examined the combined propulsion, levitation and guidance system (PLG system) which can generate levitation, guidance and propulsion forces by the same coil. This paper describes the test run of the PLG system, whose ground coils (PLG coil) are constructed in one part of the Miyazaki test track. In designing the PLG coil, we make clear the magnitudes of the force acting both under normal and unusual conditions because the electromagnetic force, which levitates, guides, and propels the vehicle, directly acts on the magnet winding of the PLG coil. In the experiment, we examine both the performance of the vehicle and the force of a PLG coil. The measurement of the force at the PLG coil gives not only propulsion force and levitation force directly, but also guidance stiffness by sifting the measured coil. Good correlation recognized between the calculation and the experiment in the propulsion force, levitation force, and guidance stiffness proves that the required characteristics can be expected from the PLG system even under combination of propulsion, levitation and guidance.     

过程自动化实习培训装置的设计制造

介绍了一种实习培训装置，该装置新型、实用，具有强大的功能，能开出全部自动化单元及系统实验，DDC控制和SPC控制的实验。具有优良的性能价格比。     

基于着色Petri网的无线闭塞中心安全加密

针对中国列车控制系统（CTCS）-3级列车控制系统中的车地安全通信问题,采用层次化建模思想,设计了一种基于Petri网理论的无线闭塞中心（RBC）和列车之间信息交互的模型,并应用着色Petri网（CPN）tools仿真工具动态仿真了列车和RBC之间传输信息的生成、加密和发送的整个过程。该模型主要分为三个部分：列车申请行车许可（MA）、RBC生成完全监控模式下的MA和列车通过无线网络接收到MA并按照MA进行安全控车。运用动态仿真和状态空间分析工具对所提模型进行仿真分析可得,所设计模型能够满足车地信息传输的设计需求规范,具有有界性、活性、回归性和公平性,可用于车地信息的安全传输,减少软件设计缺陷。     

Modeling of Maglev Yaw System of Wind Turbines and its Robust Trajectory Tracking Control in the Levitating and Landing Process Based on Ndob

The yaw system is one of the important parts of the horizontal axis wind turbines. In this paper, a novel maglev yaw system (MYS) is introduced, a novel robust controller based on nonlinear disturbance observer (NDOB) is proposed to improve the dynamic suspension stability of the MYS in its levitating and landing process. First, the dynamic model of the MYS is built and analyzed as well as the model of the force caused by crosswind exerting on the MYS, and then the mathematical model of the MYS is derived from its dynamic model. Second, since the uncertain internal disturbance originated from the MYS itself exists, in order to realize the finite time convergence and improve the robustness of the MYS, a NDOB‐based robust controller is designed via like nonsingular terminal sliding mode (LNTSM) method with the aid of backstepping design idea (BDI) to guarantee that the system output asymptotically tracks the reference trajectory, and the levitating and landing velocities of the MYS converge to their expectations globally and asymptotically in finite time. Finally, compared the conventional backstepping control (BC), the extensive simulation results show that the proposed robust controller has a better robustness and the MYS can realize smooth and reliable operations in its levitating and landing process in finite time, therefore the novel robust controller is substantiated to be effective and feasible.