Car buyers and fuel economy?

This research is designed to help researchers and policy makers ground their work in the reality of how US consumers are thinking and behaving with respect to automotive fuel economy. Our data are from semi-structured interviews with 57 households across nine lifestyle “sectors.” We found no household that analyzed their fuel costs in a systematic way in their automobile or gasoline purchases. Almost none of these households track gasoline costs over time or consider them explicitly in household budgets. These households may know the cost of their last tank of gasoline and the unit price of gasoline on that day, but this accurate information is rapidly forgotten and replaced by typical information. One effect of this lack of knowledge and information is that when consumers buy a vehicle, they do not have the basic building blocks of knowledge assumed by the model of economically rational decision-making, and they make large errors estimating gasoline costs and savings over time.     

Binder systems for waterborne two-pack products for car refinishes application

Waterborne (WB) products are of growing importance in the car refinishes market. Especially WB basecoats are gaining increased market share during the last couple of years. The introduction of WB two-pack primers, fillers, clearcoats and single stage topcoats is hampered, however due to the lack of suited binder systems.

In this paper, new approaches will be presented for two-pack binder systems. A number of topics will be discussed in more detail: the design of the binders, the involved chemistry, the incorporation of stabilizing and reactive groups, the functionality and miscibility of the hardener. Based on these variables, the most important properties have been studied: film formation, reactivity, potlife and paint properties like hardness, appearance and water and solvent resistance. During the investigation, model studies have also been applied.

It is shown that some binder systems offer very attractive features in which a number of properties can be tuned, e.g. amine-functional emulsions combined with acetoacetate-functional hardeners result in an excellent level of properties suited for primer/filler application.

These binder systems have been used as the starting points for product development that resulted in new prototypes of low VOC WB products with a very attractive overall performance.     

STUDY ON CONTROL STRATEGY OF CLUTCH STARTING FOR CAR WITH A METAL PUSHING BELT-PLANETARY GEAR CONTINUOUSLY VARIABLE TRANSMISSION SYSTEM

0 INTRODUCTIONA metal pushing belt-p1anetary gear continuouslyvariable transbossion was invented by Macey andVahabzadeh in l987[1]. The most retnarkablecharacteristic of this tusAnssion is a wider rahorange than a conventional metal pushing beltcontinuously variable transndssion, and without areversal planeop gear, the transmission ratio range isconhnuously expanded from positive ratio to negahveratio through a zero ratio. So a metal pushing belt-planetary gear continuously variable tran…     

青藏发电车柴电装置燃油系统设计

青藏高原环境的恶劣，使得青藏发电车上柴油发电装置的燃油系统设计面临一系列问题。本文针对设计过程中所面临的各项高原环境特有的问题，逐步展开对燃油系统部件的设计，并在设计中合理有效的解决了这些问题。     

铝合金车轮13°冲击试验仿真分析

为了减少铝合金车轮性能检测的试验次数以提高车轮的设计研发效率,建立铝合金车轮13°冲击试验的数值模型进行仿真试验非常必要。在充分考虑冲击试验台静态与动态效果的基础上,建立包括冲头、车轮总成和试验台架的铝合金车轮冲击试验有限元模型,其中试验台架上的橡胶支座采用弹簧—阻尼单元进行模拟,且将轮胎安装所产生的车轮预应力作为初始条件,使用非线性有限元动力分析软件LS-DYNA对铝合金车轮冲击过程进行仿真分析。通过对车轮上若干测量点应变值的有限元仿真结果与试验结果的比较,确认与铝合金车轮实际台架试验相等效的计算机模拟试验平台的有效性。该计算机模拟试验平台的建立对铝合金车轮的前期设计开发具有重要的指导意义及应用价值。     

基于ADAMS的汽车前悬架动力学仿真及优化

针对某型轿车麦弗逊前悬架在实际中定位参数变化幅度过大的问题,提出了基于ADAMS/Car的麦弗逊前悬架参数模型。通过对运动学参数、质量特性参数、力学特性参数和外界参数分析,建立了悬架系统仿真精确模型,并选取双侧车轮同向跳动工况进行仿真。同时,分析了车轮上下跳动过程中该悬架定位参数的变化规律以及对悬架性能的影响,得出了该悬架参数的合理性及存在的不足。对此,进行悬架参数优化,解决了实际中存在的缺陷,改善了悬架系统性能。     

便携式汽车清洗器的研究

随着国民经济的发展,生活节奏的加快,汽车越来越多地进入了个人的家庭,洗车市场也空前的庞大。但目前市场上的洗车方法均存在一些缺点,所以设计一种便携、环保、快速的洗车设备,具有重大的现实意义。便携式汽车清洗器的设计是在理论设计的基础上,通过模拟实验验证并完善。     

基于互补分裂谐振环的零阶谐振微带带通滤波器的设计

文章介绍了以互补分裂谐振环和一系列沟道组成的LHM为单元的零阶谐振系统（ZOR）,并给出了此系统共振频率和导纳斜率参数的确定方法。描述了由带有J－变案频器的ZOR组成的带通滤波器的设计方法。     

Deterministic performance parameters for an automotive polyurethane clearcoat loaded with hydrophilic or hydrophobic nano-silica

In this study, two different nano-silica particles (hydrophilic, Aerosil TT600 and hydrophobic, Aerosil R972) were selected in order to provide the most transparent, UV-absorbent nano-clearcoats. These nano-silica particles were used to improve and optimize properties of 2-pack polyurethane clearcoats based on acrylic polyol. Micro-PIXE analysis was employed to illustrate distribution of nano-silica in the polyurethane matrix. Physical and chemical degradations were investigated via spectrophotometry and FTIR spectroscopy.Additionally, thermal stability and the ability of the clearcoats to resist simulated car wash conditions were also studied. Contrary to belief, coatings loaded with hydrophilic nano-silica which are more UV-absorbent had less durability in UV-B/H₂O accelerated tests.     

轿车安全气囊零件流动控制精密成形技术研究

详细分析和研究了轿车安全气囊零件流动控制精密成形工艺方案及其关键技术特点,提出流动控制腔的设计方法,采用经验公式计算成形力。最后介绍了工艺试验、模具、设备及所取得的成果。