内燃机活塞-缸套-活塞环系统工作状态的识别方法

提出了一种基于证据理论方法的内燃机活塞—缸套—活塞环系统工作状态的识别方法。通过搭建试验台架,从实车试验中获取曲轴箱压力信号和机身振动加速度信号;提取试验特征值,组建模型样本和试验样本,并运用证据理论信息融合方法对内燃机的工作状态进行识别。研究结果表明:应用证据理论信息融合方法融合曲轴箱压力信号和机身振动加速度信号,进而识别活塞—缸套—活塞环系统的工作状态这一方法有效、可行。     

基于FWD检测结果旧路地基脱空状况的模糊评定

总结了利用FWD检测旧路基层脱空的方法,分析其各自的优缺点。在此基础上优化评价方法,引入模糊思想,提出一种新的地基脱空评价方法—模糊评定法,详细介绍模糊评定模型的建立方法和过程,并结合G325国道粤境开平段路面大修改善工程,探讨利用FWD检测结果现场模糊评定旧混凝土路面地基的脱空状态。工程实践表明,该方法取得了很好的实用效果,有效地指导了路面大修施工。     

汽车DYC装置液压系统建模与仿真

汽车DYC装置可以通过产生横摆力矩克服过多转向或不足转向,提高汽车高速和恶劣道路等极限条件下的操纵稳定性。对汽车DYC装置的液压系统特性进行了分析,建立了液压回路和制动器模型,分析了液压系统的工作原理和工作过程,并运用matlab/simulink对液压系统进行建模与仿真。     

FSQ6125客车设计

简要介绍FSQ6125客车的设计目的、整车造型、主要结构特点和技术参数。     

催化控制技术在二冲程通用小型汽油机上的应用

二冲程通用小型汽油机在非道路机械应用广泛,但排放不能满足EPA和欧盟标准,制约着发展。在解决二冲程通用小型汽油机排放的技术方案中,催化转化技术是目前的主流技术。     

柴油机曲轴有限元计算与台架试验数据对比分析

目前，国内柴油机行业普遍使用的曲轴弯曲疲劳强度试验台架，均采用音叉共振板结构。该试验台架对于大多数常规结构曲轴的连杆轴颈圆角疲劳强度的测定是比较准确的，但对于有些特殊结构曲轴的试验，却未能取得理想结果。以某曲轴台架试验、台架仿真模型及有限元计算模型数据为基础，分析对比了不同模型数据的差异及产生原因。     

使用乙醇还原剂的NOx-SCR催化剂的性能评价

采用计算机辅助分析的方法设计了乙醇还原剂添加装置，并使用这套装置在发动机台架上进行了稀燃NOx选择催化还原（SCR）催化剂的性能评价试验。试验结果表明，在30000h^-1空速、排温为350～420℃范围的条件下，该催化剂的NOx转化率维持在90％以上，而在低温和高温下的转化率较低；随着乙醇添加量的增加，催化剂NOx转化率提高，但同时会增加THC排放；当空速超过40000h^-1后，催化剂性能有所下降。     

沥青混凝土搅拌机燃用重渣油的尝试

为降低沥青混凝土搅拌机的生产成本,采用ZZR重渣油燃烧机替代柴油燃烧机取得了很好的经济效益,给出了燃渣油时渣油含水及油路阻塞的判断方法,并介绍了出现故障的排除方法.     

Dynamic stride length adaptation according to utility and personal space

Pedestrians adjust both speed and stride length when they navigate difficult situations such as tight corners or dense crowds. They try to avoid collisions and to preserve their personal space. State-of-the-art pedestrian motion models automatically reduce speed in dense crowds simply because there is no space where the pedestrians could go. The stride length and its correct adaptation, however, are rarely considered. This leads to artefacts that impact macroscopic observation parameters such as densities in front of bottlenecks and, through this, flow. Hence modelling stride adaptation is important to increase the predictive power of pedestrian models. To achieve this we reformulate the problem as an optimisation problem on a disk around the pedestrian. Each pedestrian seeks the position that is most attractive in a sense of balanced goals between the search for targets, the need for individual space and the need to keep a distance from obstacles. The need for space is modelled according to findings from psychology defining zones around a person that, when invaded, cause unease. The result is a fully automatic adjustment that allows calibration through meaningful social parameters and that gives visually natural results with an excellent fit to measured experimental data.     

Transport energy consumption in mountainous roads. A comparative case study for internal combustion engines and electric vehicles in Andorra

This paper analyses transport energy consumption of conventional and electric vehicles in mountainous roads. A standard round trip in Andorra has been modelled in order to characterise vehicle dynamics in hilly regions. Two conventional diesel vehicles and their electric-equivalent models have been simulated and their performances have been compared. Six scenarios have been simulated to study the effects of factors such as orography, traffic congestion and driving style. The European fuel consumption and emissions test and Artemis urban driving cycles, representative of European driving cycles, have also been included in the comparative analysis. The results show that road grade has a major impact on fuel economy, although it affects consumption in different levels depending on the technology analysed. Electric vehicles are less affected by this factor as opposed to conventional vehicles, increasing the potential energy savings in a hypothetical electrification of the car fleet. However, electric vehicle range in mountainous terrains is lower compared to that estimated by manufacturers, a fact that could adversely affect a massive adoption of electric cars in the short term.