基于t检验的车辆行驶阻力及相关系数可信度分析

通过车辆道路滑行试验及数据处理方法,建立不同的数学模型,采用回归分析法得出滑行阻力的方程式,并用t检验法对相关参数进行了可信度分析,确定了较为准确的滚动阻力和空气阻力,同时验证了GB/T18352.3-2005和GB/T12545.1-2008中经验公式的局限性,从而为底盘测功机标定提供更为准确的行驶阻力。     

“省钱专家”震撼上市 玲珑家族又添新贵

玲珑轮胎不断完善产品线,面向高端标载市场,推出驱动轴专用及导向轮专用省油轮胎产品-D810和T809花纹,两款花纹凭借较低的滚动阻力、更优化的花纹设计和更强壮的胎体结构,保证了产品的最佳使用效果,为广大卡客车用户提供了更加安全、更加经济的轮胎使用方案。     

轮胎花纹与汽车使用性能

轮胎花纹影响汽车的性能,特别是汽车的安全使用性能.分析了影响汽车轮胎花纹作用的因素及使用注意事项,提出了延长汽车轮胎使用寿命的措施.     

玲珑“省钱专家” 卡客车轮胎上市

玲珑轮胎日前推出了卡客车驱动轴专用及导向轮专用省油产品——DL810和TL809两款花纹轮胎。这两款轮胎凭借较低的滚动阻力．更优化的花纹设计和更强壮的胎体结构．保证了产品的最佳使用效果．为广大卡客车用户提供了更加安全、更加经济的轮胎使用方案。     

地铁列车噪声标准和车站站台噪声限值

本文重点介绍地铁列车噪声标准和车站站台噪声取值，并详细地描述了噪声测试时测点布置方法及采取不同降噪措施的降噪量，同时还介绍了地铁列车的振动标准。     

阻力加载对乘用车WLTC循环排放及油耗影响

基于一辆搭载1.4 L涡轮增压汽油机的乘用车汽车,通过WLTC循环工况测试,分别对比研究了不同阻力加载a和b对整车试验循环排放及油耗的影响。研究发现:阻力加载b在中低速阶段的阻力相对阻力加载a比较小,对排放和油耗均有一定程度的改善;但是第四阶段阻力加载b相对阻力加载a较大,排放和油耗均增加;但是整体综合排放和油耗均有改善。     

整车参数对混合动力汽车NEDC工况油耗的影响

混合动力整车油耗不仅仅取决于混合动力系统的优劣,与整车参数也有很大的关系,但混合动力汽车与传统汽车相比,整车参数对油耗的影响是有一定差别的,本文研究了一些主要的整车参数对混合动力汽车的油耗影响。基于功率分流式混合动力车辆的Amesim仿真模型,选取整车质量、轮胎滚动半径、滑行阻力曲线三个因素并利用正交表的方法分析其对油耗的影响,从而指导利用该模型进行功率分流式混合动力车辆的油耗分析和优化。研究表明,混合动力汽车由于制动能量回收的影响,整备质量对油耗的影响小于传统汽车;由于功率分流的能量控制策略,轮胎滚动半径对油耗的影响很小;滑行阻力对油耗的影响和传统汽车接近。     

米其林首推驱动轴专用省油轮胎产品——面向中国市场 性能卓越平衡 满足广大用户多重需求

4月20日,米其林(中国)投资有限公司宣布,将推出两款卡客车省油轮胎—米其林XDA 2Energy和XDA 2+ Energy,这是米其林面向中国市场首次推出驱动轴专用省油轮胎产品。凭借更低的滚动阻力、更优化的花纹设计和更强壮的胎体设计,这两款产品以其性能的卓越平衡,为国内广大卡客车用户提供了更安全、更高效的轮胎解决方案。     

绿色宽基轮胎在道路运输中的应用

1.项目先进性和技术成熟度评价与双胎并用相比，宽基子午线轮胎维护保养便利，轮胎滚动阻力更低，重量更轻，可以有效降低油耗，为用户节省成本。目前宽基子午线轮胎胎已在欧美得到成功推广应用，占欧洲载重汽车轮胎替换市场的22%，在美国市场份额也在不断增加。     

基于统计能量分析方法的助燃风机噪声分析及治理

通过对某钢铁公司高炉助燃风机产生的主要噪声源进行测试,文章提出了风机噪声综合治理方案并用VAOne软件进行了仿真分析,仿真结果和实测结果均表明治理方案是可行的,本文的思路对风机噪声的治理有一定的参考价值。     

A technical analysis of model year 2011 US automobile efficiency

This paper investigates the new 2011 automobile fleet to quantify the variation in models’ efficiency and underlying technology attributes. This involves analysis of test data to quantify the aerodynamic, rolling resistance, and powertrain efficiency characteristics of each model, as well as analysis to understand relationships between these and vehicle fuel consumption. The findings indicate that while vehicles are about 14% efficient on average, there is wide variation and direct evidence of dramatically improved powertrain efficiency within existing models. Existing gasoline and diesel models demonstrate improved powertrain efficiency by over 25%, hybrid gasoline-electric powertrains by over 50%, fuel cells by a factor of three, and all-electric by a factor of four as compared to the average 2011 vehicle. Advanced aerodynamic and tire rolling resistance technologies are also in evidence.     

轮胎路面接触应力分布仿真研究

根据11.00R20-16PR型全钢子午线轮胎实际结构,考虑轮胎材料、几何及接触非线性,利用ABAQUS有限元软件建立轮胎与刚性路面接触三维模型,并与轮胎径向刚度试验结果对比验证了该模型的有效性;分析了静止竖向荷载作用下胎压一定荷载不同和荷载一定胎压不同的轮胎路面接触应力及印迹分布变化。研究结果表明:轮胎与路面接触应力呈非均匀分布,且接触面积并非路面设计中所采用的圆形而更接近于矩形。     

多传感器的车辆信号灯故障动态监测方法研究

车辆信号灯对行车安全有重要的警示作用,现有的载货汽车不具备完善的信号灯故障动态监测预警功能。为在车辆行驶过程中对信号灯故障进行实时动态监测预警,设计了一种基于单片机控制、多传感器输入的车辆信号灯故障监测预警装置,基于信号灯工作原理的差异分别提出了信号灯故障0-1监测法、积分判别法和最小值判别法。以解放赛龙CA1169PK2L2EA80重型载货汽车为试验车,Freescale MC9S12XEP100单片机为车载终端构建了车辆信号灯故障监测试验系统平台。利用TES-1339R照度计分析了不同光照强度的外界光源对系统监测结果的影响,并采用故障预设的试验方法针对制动和转向信号灯分别采用不同的故障判别方法进行实车试验。试验结果表明:0-1监测法可以准确监测制动灯故障信号;积分判别法和最小值判别法适用于转向灯故障监测,最小值判别法较积分判别法监测转向灯故障分辨率高。该系统实现了车辆信号灯故障实时动态监测及声光预警,为预防由信号灯故障引发的道路交通事故提供了一种新方法。     

济青高速公路绿化带对交通噪声和铅污染的防护作用

公路绿化带可对交通噪声和汽车尾气带来的铅(Pb)污染产生一定防护作用,这对于减轻路域环境污染具有重要意义。采用原位调查和取样分析相结合的方法,研究了山东省济青高速公路路侧绿化带对交通噪声和铅污染的衰减效果。研究结果表明,高速公路绿化带对交通噪声有一定的减轻作用,但在不同的绿化模式下,衰减效果存在较大差异。济青高速公路两侧土壤存在一定程度的Pb污染,在不同绿化模式下,路侧绿化林带对公路Pb污染的防护作用也有较大差别,宽度过大的林带并不是防护Pb污染的理想措施。     

绿色轮胎推广应用政策建议

我国道路运输车辆保有量巨大,发展和逐步推广使用绿色轮胎,是我国深入推进交通运输节能减排和生态文明建设的重要领域和关键环节,论文通过分析绿色轮胎在道路运输行业应用的机遇及问题,并以12 m营运客车为例对绿色轮胎进行成本效益分析,总结提出了绿色轮胎的推广应用思路和建议。     

全钢子午线轮胎加强层帘线角对胎圈部位性能的影响

子午线轮胎有着节能、耐用的优点。使用Abaqus有限元软件建立三维有限元轮胎模型并通过将有限元模拟计算结果和实际实验数据对比,验证了模型的正确性。在此基础上,探究了加强层帘线角对胎圈部位应力影响,结果表明:在充气和垂直载荷下,随着帘线角的增加,胎体与加强层端点最大应力、应变能均出现先增后减的趋势。垂直载荷下胎圈部位的刚度随着帘线角增加而一直减小。拟合出了出垂直载荷最大应力、应变能和加强层端点下沉量随帘线角变化的函数。计算得到40.7°的帘线角能够大幅降低加强层端点处的应力、应变能,同时对该处的刚度影响较小。研究结果可为选用适合的加强层帘线角以保证节能和负载的同时减少早期破坏提供理论依据。     

The overall effects of road works on global warming gas emissions

Road characteristics influence the amount of pollution generated by traffic. They govern the rolling resistance, which includes: the viscoelastic behaviour of the pavement structure, surface texture, and profile unevenness. Road works are performed on a periodic basis to maintain these characteristics at proper levels of service (e.g. safety, comfort, and noise). While such works produce additional pollution (due to congestion around worksites or extra fuel consumption along the detour route), they still result in less pollution over the long term. This article assesses the balance between an increase in gas emissions during road works and the reduction in emissions from traffic once the works are completed. It is demonstrated that when road works are introduced to correct longitudinal profiles, rather than texture, the emissions benefit is substantial.     

Options for reducing noise from roads and railway lines

The fundamental noise generation mechanisms of road and rail vehicles are discussed with attention to noise abatement measures. Based on an evaluation of publicly available tire noise data and the European road traffic noise emission model CNOSSOS, it is shown that on the road side there is a significant noise reduction potential in the usage of low-noise tires. From a three months measurement campaign a noise model was derived to predict the maximal sound pressure level of heavy duty vehicles during a pass-by in 7.5 m distance with the parameters vehicle speed and number of axles. With help of recently published information about external costs caused by heavy duty vehicles and the noise prediction tool, a model was developed to derive a money equivalent that can be used as a bonus/malus in a heavy duty vehicle fee. As a measure at the infrastructure, the installation of low-noise pavements is an effective, durable and economically attractive measure. Recent experiences with different technologies from all over the world are compiled and evaluated. On the rail side, an overview of the possible noise reduction strategies is given, followed by a discussion of the current policy and legislation in the EU and on the national level of different European countries.     

An experimental study of the effect of low-noise wheels in reducing noise and vibration

Wheel/rail interaction is a major source of railway noise. A low-noise wheel structure is developed and its effect on noise reduction is investigated. This low-noise wheel employs a rubber material inserted into the steel rim or mounted on the wheel surface. The low-noise wheel has low stiffness and a high-damping ratio compared to a solid wheel. Measurement shows that it reduces rolling and squealing. It turns out that a subway line with the proposed wheel could reduce its interior noise level by 4–5 dB(A) and vehicle vibration level by 7–8 dB. While the proposed structure seems promising in noise reduction for railway vehicles, the endurance and cost effectiveness of the low-noise wheel are yet to be verified.     

沥青混合料永久变形试验方法

文章基于力学原理,对沥青混合料永久变形的各种试验方法的优缺点进行了比较,得出三轴重复荷载蠕变试验是评估沥青混合料永久变形的首选方案,其不仅能模拟道路的实际受力状态,而且能准确的进行车辙的计算和预估,值得推广应用。