搜索算法在无人艇航迹规划中的应用

[目的]为了更加有效地利用无人艇(USV)执行复杂的海洋作业,需要可靠的航迹规划算法.针对现有路径规划算法研究,提出一种基于2D扫描思想的搜索扫描算法.[方法]首先,建立环境空间模型,在起点与终点之间存在障碍物的前提下,通过起点360°扫描获取周围障碍物信息,并确定子节点.然后,通过确定代价函数获取子节点,不断扫描最优...     

车辆悬挂系统的辨识建模

论述了在滚动振动试验台上进行车辆垂向悬挂系统的辨识建模方法。通过试验,应用扩充最小二乘法,建立了车辆垂向悬挂系统的参数化模型。     

铁道车辆横向主动悬挂试验研究

建立了铁道车辆１：８比例的半车四自由度横向主动悬挂试验模型,应用ＬＱＲ控制方法进行了主动悬挂与被动悬挂的试验对比研究,并与仿真计算结果进行比较。研究结果表明,主动悬挂方式能有效衰减振动,尤其是共振点处的振动;主动悬挂与被悬挂相比,车体横移振幅在高频共振点附近平均降低８０％左右,在其余频段平均降低约３０％;车体侧滚角振幅在高频共振点附近平均降低６５％左右,在其余频段平均降低约２０％。     

高速铁路摆式车辆的开发

介绍了摆式车辆的提速原理和种类，以及国外倾摆车辆的实用情况、主要参数比较。     

A design methodology for mechatronic vehicles: application of multidisciplinary optimization, multibody dynamics and genetic algorithms

A design methodology for mechatronic vehicles is presented. With multidisciplinary optimization (MDO) methods, strongly coupled mechanical, control and other subsystems are integrated as a synergistic vehicle system. With genetic algorithms (GAs) at the system level, the mechanical, control and other relevant parameters can be optimized simultaneously. To demonstrate the feasibility and efficacy of the proposed design methodology for mechatronic vehicles, it is used to resolve the conflicting requirements for ride comfort, suspension working spaces and unsprung mass dynamic loads in the optimization of half-vehicle models with active suspensions. Both deterministic and random road excitations, both rigid and flexible vehicle bodies and both perfect measurement of full state variables and estimated limited state variables are considered. Numerical results show that the optimized vehicle systems based on the methodology have better overall performance than those using the linear quadratic Gaussian (LQG) controller. It is shown that the methodology is suitable for complex design optimization problems where: (1) there is interaction between different disciplines or subsystems; (2) there are multiple design criteria; (3) there are multiple local optima; (4) there is no need for sensitivity analysis for the optimizer at the system level; and (5) there are multiple design variables.     

Transport and environment interactions: the italian framework

With road traffic in Europe forecast to increase, strategies are needed to keep transportation sector growth within the bounds imposed by a sustainable development. Research is contributing through a large number of projects dealing with transport–environment interactions. This paper reviews international research activities in this field, focusing on technological innovations, air and noise pollution prediction models, and existing tools for socioeconomic evaluation of traffic impacts on the environment. In particular, research projects of the Second Special Project on Transport (PFT2) of the Italian National Research Council (CNR) are outlined.     

城轨车辆地板布粘接结构与工艺

文章介绍了城轨车辆常见的地板布粘接结构与粘接工艺,为保证粘接质量,降低成本,通过试验验证了部分粘接工艺参数。     

广州地铁新线车辆受电弓在线动态检测系统

针对地铁车辆受电弓检测耗时耗力的问题,提出了一种利用图像检测法的在线动态检测系统。首先介绍了系统的总体构成,包括现场数据采集单元、现场控制单元、数据分析单元、数据存储与发布单元和客户访问单元五部分;其次详细介绍了系统的四个子系统(受电弓弓头检测系统、受电弓温度检测系统、车顶监测系统和车号自动识别系统)的系统方案和工作原理;最后对该系统进行计算机仿真验证,验证结果表明该系统优于人工测量,具有实时、准确、可靠等优点,满足受电弓测量和维保需求。     

基于Isograph的故障树分析技术在轨道客车中的应用

以列车在正线运行时客室门意外打开为顶事件,利用Isograph软件建立故障树和进行故障树分析,详细说明了以Isograph软件为基础的故障树分析过程和方法,并对故障树分析结果进行了分析,说明了故障树分析技术在轨道客车安全性分析、系统可靠性分析及风险评估中的应用价值.     

改型的特种车专用电源创新

介绍改型的特种车专用电源的多次改进创新，阐述其设计思路及电路原理。