Full vehicle simulation using thermomechanically coupled hybrid neural network shock absorber model

In the case of full vehicle models, the technique of multi-body simulation (MBS) is frequently used to study their highly non-linear dynamic behaviour. Many non-linearities in vehicle models are induced by force elements like springs, shock absorbers, bushings and tires. Commonly, spline functions are used to represent the force responses of these components. If the non-linear relationships are more complicated, the spline approximations are no more accurate. An alternative approach is based on empirical neural networks which are based on the mathematical approximation of measured data. It is well known that neural networks are able to represent and predict complex component responses accurately. The aim of this paper is to perform a dynamic full vehicle simulation using a thermomechanically coupled hybrid neural network shock absorber model. In this shock absorber model, the spline approach is combined with a temperature-dependent neural network. Based on a displacement-controlled excitation on a four post test rig in the ADAMS/Car MBS software, a rugged test track is simulated. In this way, the front and rear shock absorbers are dynamically loaded with comfort-relevant frequencies in the range of 0.75-30 Hz and velocity amplitudes up to 2 m/s. By the simulation, stability of the hybrid neural network model is demonstrated. Furthermore, the damping force, the vertical acceleration of the chassis and the required simulation times are compared. The standard spline approach is used as a reference.     

高速铁路电力远动技术的应用和思考

目前,电力远动技术在高速铁路中得到广泛的应用,并在功能上得以增强,对确保运输安全供电及快速抢修起到积极的作用。本文以郑西高速铁路电力远动系统为例,介绍其构成、功能及应用情况,并结合现场实际,对电力线路故障点判断提出建议。     

直线电机在城市轨道交通中的优势及应用

直线电机轮轨交通系统因其工程造价低、线路适应性强等优势，被认为是资源节约型城市轨道交通先进模式。分析了日本、加拿大等直线电机地铁车辆的转向架、牵引和制动等技术的特点和性能，探讨了直线电机在城市轨道交通应用中的经济性和适用性。     

汽车自动变速器整车台架试验设备的研制

针对自动变速器现行试验方式的局限,提出一种能替代道路试验,在整车试验条件下对自动变速器性能进行不解体检测的试验设备的设计方案,论述了其技术原理、结构组成及功能特点,试验考核表明,较路试更为全面、准确、稳定、可靠,具有较高的实用价值和推广应用价值。     

整车电源分配设计要点

汽车线路是汽车电器的网络主体,其功能是实现整车电器零部件的电路连接。由于电子产品在汽车上大量应用,汽车线路的电源分配直接影响汽车的安全性能。本文阐述整车电源分配的几种方式及设计要点,以利于更好地对整车电源分配进行设计,提高汽车的使用及安全性能。     

Virtual test rig to improve the design and optimisation process of the vehicle steering and suspension systems

A virtual test rig is presented using a three-dimensional model of the elasto-kinematic behaviour of a vehicle. A general approach is put forward to determine the three-dimensional position of the body and the main parameters which influence the handling of the vehicle. For the design process, the variable input data are the longitudinal and lateral acceleration and the curve radius, which are defined by the user as a design goal. For the optimisation process, once the vehicle has been built, the variable input data are the travel of the four struts and the steering wheel angle, which is obtained through monitoring the vehicle. The virtual test rig has been applied to a standard vehicle and the validity of the results has been proven.     

移动电站维修常见技术问题分析

通过对移动电站维修中存在的技术问题深入分析,指出了问题的成因、导致的后果,并逐一提出了解决问题的方法和避免问题的注意事项等。     

关于纯电动面包物流车漏雨问题的分析与研究

文章针对纯电动面包物流车淋雨密封存在的一些漏雨问题,阐述了现状及典型淋雨漏水点,并分析了其漏水原因及进行了优化改善,进一步提高了其一次性淋雨通过率,明显提升了纯电动面包物流车的淋雨密封品质。     

关于长沙市轨道交通线网规划车辆选型的研究

介绍长沙市轨道交通线网规划车辆选型的研究过程,主要以现行规范、标准为依据,以客流预测为基地,以运能储备率为评价标准。简化了以往车辆选型过多纠结车辆内部技术参数的问题,方法简单清晰。     

基于可拓切换控制方法的智能车辆车道保持系统研究（双语出版）

针对道路曲率变化范围较大时，智能车辆在大曲率道路工况车道保持控制精度低的问题，提出一种基于可拓切换控制理论的智能车辆车道保持控制系统，该车道保持系统由上层可拓控制器和下层控制器两部分组成。在上层可拓控制器中，通过车道线检测得到车辆相对于道路的位置信息和道路曲率信息。根据可拓集合理论，选取预瞄点处横向位置偏差和前方道路曲率值作为可拓集合的特征值并划分可拓集合，求解关联函数，并根据关联函数值将车辆-道路系统状态分为经典域、可拓域和非域。在下层控制器中，在经典域采用基于横向位置偏差和航向偏差的PID反馈控制器，在可拓域中采用基于前方道路曲率的PID前馈-反馈控制器，非域中车辆-道路系统处于完全失控状态，采取紧急制动。2种仿真工况结果表明：相比于单一PID反馈控制，提出的车道保持控制系统，有效抑制了在大曲率道路下的跟踪误差值，提高了智能驾驶汽车在时变曲率的道路工况下车道保持控制精度和工况适应性。