Development and performance analysis of an automotive power seat for disabled persons

As the number of disabled people grows, independence and mobility become a priority for those individuals. To achieve this goal, a ‘Turny-type power seat’ was developed in this study to assist a disabled person rise from a vehicle without trouble. The design and modeling of the power seat were performed using AutoCAD and CATIA software. The major motions of the power seat system are swiveling, sliding, and extending, which are accomplished primarily by DC motors, chains, and gears. Most of the power seat parts were made from mild steel. Welding technology was used throughout the frame fabrication. To ensure the safety and stability of the power seat, various tests were performed, and the results analyzed. The static analysis of the power seat was carried out by ANSYS 11.0. The results showed that the power seat conformed to the Americans with Disabilities Act (ADA) standards. The durability test was performed by repeatedly rotating and sliding the power seat under loading conditions. Dynamic crash simulation was carried out using the LS-DYNA software. The durability test ensured a longer life of the power seat, while the crash analysis showed a small rotational distortion that was not harmful to passengers. However, the front seat had a slightly larger forward displacement, which was not comfortable for passengers. Therefore, further modifications of the power seat should be done to improve the performance, with attention given to the reduction of the forward displacement in the event of a crash.     

Effect of structural variables on automotive body bumper impact beam

Increasing fuel economy has been a central issue in the development of new cars, and one of the important strategies to improve fuel economy is to decrease vehicle weight. In order to obtain this goal, researchers have sought to make bumpers lighter without sacrificing strength, ability to absorb impact, or passenger safety. In this study, the effects of structural variables on the torsional stiffness of a body bumper impact beam were analyzed for possible weight reduction. To this end, the effects of variation of section height, increase of impact beam thickness and the addition of stays in a bumper impact beam were carefully investigated and compared. Among these, the most effective way to increase the torsional stiffness of the bumper impact beam was found to be increasing the section height. In addition, the potential for overall weight reduction of the impact beam was examined by comparing the crash capability of a bumper using conventional steels with that of high-strength steel (boron steel) with a tensile strength of 1.5 GPa. This analysis could serve as a guide to design for optimal bumper impact beam development.     

Technology analysis and low-cost design of automotive radar for adaptive cruise control system

Recently, the advanced driver assistance system (ADAS), which helps mitigate car accidents, has been developed using environmental detection sensors, such as long and short range radar, lidar, wide dynamic range cameras, ultrasonic sensors and laser scanners. Among these detection sensors, radars can quickly provide drivers with reliable information about the velocity, distance and direction of a target obstacle, as well as information about the vehicle in changing weather conditions. In the adaptive cruise control system (ACCS), three radar sensors are usually needed because two short range radars are used to detect objects in the adjacent lane and one long range radar is used to detect objects in-path. In this paper, low-cost radar based on a single sensor, which can detect objects in both the adjacent lane and in-path, is proposed for use in the ACCS. Before designing the proposed radar, we analyzed the world-wide radar technology and market trends for ACCS. Based on this analysis, we designed a novel radar sensor for the ACCS using radar components, such as an antenna, transceiver module, transceiver control module and signal processing algorithm. Finally, target detection experiments were conducted. In the experimental results, the proposed single radar can successfully complete the detection required for the ACCS. In the conclusion, the perspective and issues in the future development of the ACCS radar are described.     

CATIA运动仿真在汽车设计中的应用

对汽车总体设计要求进行介绍,阐述了电子虚拟装配及运动仿真模型建立基本过程,根据电子虚拟装配及运动仿真特点。讨论其在汽车总体设计中的应用。     

汽车行业工业APP云平台设计架构分析

随着工业互联网技术的蓬勃发展,工业APP云平台成为国内外企业争相研究的热点领域。但目前在汽车行业,国内还缺少一个统一的工业APP云平台进行资源的整合和管理。同时大量工程经验知识缺乏数字化的继承,制约了汽车行业更好更快地发展。对汽车行业工业APP云平台设计架构进行分析,设计了云平台的整体功能架构,简要介绍了平台各层级的功能实现以及平台架构特点,对云平台构建过程中的OpenStack设计架构和微服务架构进行分析,为云平台的实现提供了重要技术手段。汽车行业工业APP云平台建设对汽车行业数字化改革具有重要参考意义。     

基才语义的汽车线束工艺分析系统研究

通过对线束图纸建立语义模型,开发基于语义的汽车线束工艺分析系统。该系统能够协助工艺设计人员进行内联设计、预装设计,并能自动生成下线、压接、内联、预装、BOM等各种工艺文件。该系统的应用,使工艺设计人员能在更高层次上进行工艺设计,有效提高了线束生产效率和准确率,其他人员也可以通过软件的信息检索功能方便快捷地找到所需的历史BOM和对应零部件的基本信息。     

基于ADVISOR的电动汽车传动系统参数设计与性能仿真

对电动汽车电动机、传动系的传动比和电池组容量等参数设计的原则和方法进行了研究,以某种型号电动汽车为研究对象,对其动力传动系的参数进行合理的选择和设计.建立了整车动力传动系统的仿真模型,应用电动汽车仿真软件ADVISOR对整车动力性进行了仿真计算.仿真结果表明,以铅酸电池为能源的电动汽车的加速性、爬坡能力、最大车速、续驶...     

CAD技术在汽车底盘——车桥设计中的应用

介绍了CAD技术的发展历程,车桥及在车桥结构设计和运动分析过程中的一般应用形式．阐述了CAD技术的发展趋势。     

基于有限元理论的某型汽车悬架结构件的强度分析

针对某型客车空气悬架应用有限元软件ANSYS对其重要结构件-弹簧支架进行了有限元分析,计算了弹簧支架的应力和变形特性,找出了原有结构设计的薄弱环节,指出了改进设计方向。     

关于汽车座椅系统安全性的若干研究

汽车座椅是汽车结构中的重要组成部分,它的安全性直接影响着汽车整体的安全性能。对于汽车座椅安全性能的研究是非常必要且持续不断的一个过程。本文通过对汽车座椅的结构类型进行分析,并对汽车座椅安全性能的影响因素进行分析,从而总结出影响汽车座椅安全性的若干问题。     

整体式座椅对行李箱冲击影响的研究

国标GB 15083中关于防止移动行李对乘员伤害的特殊规定,有效防止急刹中行李箱内行李向前冲撞而损坏后排座椅,从而影响后排乘员的安全。结合标准要求,借助CAE工具,对某款座椅进行分析,提出了改进方案,试验证明所提的改进方案是有效的,并提出设计建议。     

CAE仿真在油泵齿轮滑动支撑设计中的应用

本文对变速器油泵齿轮滑动支撑结构进行设计,通过CAE仿真分析,建立油泵齿轮模型,设置液压力与输入扭矩等边界条件,可获得准确的齿轮支撑面受力值,结合油泵运行条件,计算出准确的PV值等评价参数,最终选定滑动轴承类型。这种方法解决了油泵滑动轴承选择时输入条件不易确定的问题,提高了产品设计的准确性,为油泵结构设计提供了新思路。     

汽车整车对标技术的研究

介绍了汽车整车对标的作用、工作内容（成立项目组、市场调查、采购对标产品、分析整车结构和功能、拍照、性能试验、整车逆向分析、缺陷分析、管理零件、建立对标数据库）项目管理技术和编写对标文档,同时提供了具体的实际项目操作案例。为汽车企业进行整车对标项目提供参考。     

汽车驱动桥后盖焊缝渗油、漏油原因分析及改进措施

针对汽车驱动桥后盖焊缝渗油、漏油问题,从现场质量控制手段,失效件理化分析、有限元分析等方面进行原因分析,制定改进措施。     

对呼和浩特市新增客运出租汽车的经验分析

根据呼和浩特市的具体情况,分析了市区出租汽车市场现状,对2007年新增客运出租汽车的背景进行阐述,并总结了成功经验。     

试论全寿命分析法在路面设计中的应用

全寿命设计方法是一项较新的设计理念,将其用于路面设计目前为止还不多。讨论了美国相关法案(Pave- ment Division Interim Technical Bulletin)中的路面全寿命分析(LCCA)方法,并基于该思路提出了路面全寿命设计方法,试图建立全寿命路面设计的初步体系。     

欧盟NCAP及车辆安全技术发展动态的研究

本文主要通过对欧盟NCAP发展历程的研究以及欧盟NCAP如何促使车辆安全性能改善的研究探讨,对我国的车辆安全法规体系的制定发展提出了参考建议。     

埋入式抗滑桩优化设计的数值模拟分析

埋入式抗滑桩的优化设计需要考虑各类工况,譬如桩长及桩位的变化、桩截面的改变等。鉴于各种工况下模型改变不大,只需考虑抗滑桩的变化,因此有必要采用数值模拟分析方法,一则可以减少分析的工作量,一次性得到各类工况的模拟结果;另则便于根据需要灵活调整工况组合,进行对比分析。文章以重庆市武隆滑坡典型剖面的数值模拟分析为例,计算了四种桩长的工况,并与原设计方案进行对比,提出了优化设计的建议。     

Effects of end coils on the natural frequency of automotive engine valve springs

In this paper, we present a method for estimating the natural frequencies of various engine valve springs such as constant pitch, two-step variable pitch, three-step variable pitch, and progressive springs. Since a valve spring’s surging amplitude is magnified when the spring’s natural frequency coincides with the frequency of the cam profile harmonic components, estimating the natural frequency of the spring is the first step in predicting valve spring surging phenomena. A new method for calculating the valve spring’s natural frequency is proposed in this paper that considers the end coil effect. This method predicts not only the natural frequency of a helical spring at a fixed number of active turns, but also the change in the natural frequency as the spring is compressed. The experimental results demonstrate that nonlinear characteristics of engine valve springs can be predicted from the given initial pitch curves.     

Numerical investigation on the dynamic characteristics of an automotive A/C hose

The objective of this study is to investigate the dynamic deformation characteristics of an automotive A/C hose assembly using the finite element method and experimentation. The finite element analysis consisted of two analyses, specifically, a modal and a transient analysis. The dynamic modal analysis was conducted to assess the dynamic characteristics of the A/C hose structure, and the dynamic transient analysis was performed to investigate the dynamic stresses of an automotive A/C hose by dynamic loading with particular emphasis on the reinforced braid. Furthermore, the analyses results are expected to provide useful reference data in the design optimization of the hose layout related to the constrained design space. Modal testing was undertaken to verify the FE model. The FE result was in good agreement with the experimental results. The modal analysis result showed that the bending and swing modes of the hose occurred in the first six natural frequencies. The dynamic transient result showed that the maximum stress in the hose components occurred in the reinforced braid layers, which are particularly damage-prone.