履带式地面移动机器人动力学模型分析

针对目前履带式地面移动机器人系统的建模、仿真和控制研究很不完善的问题,将移动式模块化的机械手做一个整体结构考虑,建立了一种非完整约束的履带式机器人系统模型.运用极限理论进行了正向运动学分析;考虑履带与地面的相互作用因素,对移动机器人进行了转向动力学分析,以求得滑转率曲线;利用机器人Lagrange动力学方法和非完整动力...     

基于ADAMS和Matlab自平衡双轮电动车系统的联合仿真

运用虚拟样机技术,可以简化机械产品的设计开发过程,缩短产品的开发周期和降低开发成本,获得最优化和创新的设计产品.为了提高自平衡双轮设计的效率与可靠性,本文建立了基于虚拟样机技术的仿真系统.在ADAMS中建立自平衡双轮的动力学模型,首先以倒立摆数学模型为基础,应用拉格朗日方程构造系统的动力学模型,然后通过ADAMS与Ma...     

基于改进量子微粒群的轨道导引小车系统建模与优化

为提高自动小车存取系统中轨道导引小车系统的出入库作业效率,提出了一种基于改进量子微粒群的优化方法。分析了轨道导引小车系统出入库作业任务队列特征,建立了数学模型。在此基础上利用量子微粒群算法进行优化调度,并在该算法中引入高斯变异算子,克服了其容易陷入局部最优的缺点。通过仿真实验表明了方法的可行性和有效性。     

川渝地区车用LNG市场前景与发展策略分析

川渝地区天然气资源丰富,发展天然气汽车优势突出.在对比分析车用LNG与其他汽车燃料竞争优势的基础上,从LNG汽车技术、LNG加注站技术、资源基础和投资LNG的愿望等方面论述了发展车用LNG的基础条件,结合川渝地区“十二五”发展规划,分析了车用LNG市场发展前景,并提出成立专项领导小组、制订相应优惠政策和技术标准、建立LNG汽车服务与监管体系、加强宣传、鼓励LNG技术创新与产品研发、鼓励企业投入LNG加注站市场建设等策略,以保障川渝地区LNG发展.     

新能源汽车行业技术瓶颈及发展趋势

分析研究了动力蓄电池、能量管理系统、充电站建设、驱动电机等新能源汽车发展过程中的技术难题,并提出了相应的解决办法和发展趋势。对相关行业人员具有学习和指导作用。     

新能源汽车SOC估算的模糊预测算法研究

电池荷电状态（SOC）是新能源汽车最重要的参数之一。在估算SOC的安时计量法原理公式中,库仑效率η难以实时准确测量,且其受到温度、电池老化、充放电电流、电池内阻变化率的影响,从而时刻发生变化。构建T-S模型,考虑各因素对η的影响,利用模糊聚类预测法,对η进行计算。经过实验验证并结合对传统安时计量法的仿真,将二者对比放电实验结果,方法将SOC计算精度提高到了3.4%。此方法解决了安时计量法中库仑效率η难以准确测量的问题。     

Hypercars: Speeding the transition to solar hydrogen

A discontinuous transformation now underway in automotive technology may accelerate the transition to transportation powered by solar hydrogen. Even using internal-combustion engines, ultralight, ultraslippery, advanced-composite, hybrid-electric “hypercars” can be severalfold lighter and lower-drag than present steel cars; many times more efficient; and over two orders of magnitude cleaner; yet equally safe, sporty, comfortable, durable, beautiful and (probably) affordable. The required design integration is technically and culturally difficult. Yet important manufacturing advantages permit a free-market commercialization strategy impelled not by government mandates or subsidies but by manufacturers' quest for competitive advantage and customers' desire for superior cars.Proton-exchange-membrane fuel cells (PEMFCs) are promising even for heavy and high-drag hybrid cars because they can convert hydrogen into traction severalfold more efficiently than today's drivelines convert gasoline. But hypercars would need significantly fewer kilowatts of power, and could therefore adopt PEMFCs earlier—before their specific cost, mass, and volume mature. The resulting high production volumes could quickly cut PEMFCs' costs enough to displace a significant portion of thermal power stations, either in stationary applications or by plugging in parked hypercars. This potential break-though for PEMFCs is one new stimuli to early emergence both of distributed electric utilities and of hydrogen fuel as a major output of renewable energy sources.     

关于测试距离对机动车前照灯发光强度影响的研究

本文介绍在三个不同测试距离下(1m、3m和10m)进行机动车前照灯远光发光强度的测试及试验结果,并通过理论分析得出结论,即选择10m的距离最为合适。     

基于虚拟仪器的车辆称重传感器的分析

针对车载式电容传感器检测车辆载荷,通过单片机将来自各轮轴传感器的信号处理后得到整车的载荷质量值,并将该值送给基于LabVIEW编写的程序,通过虚拟仪器对试验数据进行处理和误差分析,为开发利用电容传感器车辆限载装置提供良好的参考。     

Analysis of large truck crash severity using heteroskedastic ordered probit models

Long-combination vehicles (LCVs) have significant potential to increase economic productivity for shippers and carriers by decreasing the number of truck trips, thus reducing costs. However, size and weight regulations, triggered by safety concerns and, in some cases, infrastructure investment concerns, have prevented large-scale adoption of such vehicles. Information on actual crash performance is needed. To this end, this work uses standard and heteroskedastic ordered probit models, along with the United States’ Large Truck Crash Causation Study, General Estimates System, and Vehicle Inventory and Use Survey data sets, to study the impact of vehicle, occupant, driver, and environmental characteristics on injury outcomes for those involved in crashes with heavy-duty trucks. Results suggest that the likelihood of fatalities and severe injury is estimated to rise with the number of trailers, but fall with the truck length and gross vehicle weight rating (GVWR). While findings suggest that fatality likelihood for two-trailer LCVs is higher than that of single-trailer non-LCVs and other trucks, controlling for exposure risk suggest that total crash costs of LCVs are lower (per vehicle-mile traveled) than those of other trucks.