基于盘式制动器的新型车轮研发

随着车辆主动安全性能要求的提高,为客、货车配备盘式制动器逐渐成为安全的重要保证。本文主要介绍一种基于盘式制动的新型车轮的结构和性能上的优点,及其应用前景和相应建议。     

短周期拉弧螺柱焊及其在车身焊接中的质量控制

通过分析短周期拉弧螺柱焊的原理、特点和工艺过程,结合拉弧螺柱焊在车身焊接中的特点,对车身焊接过程中的螺柱焊焊接缺陷产生的原因进行了分析。结合生产现场的实际情况,对生产中产生的焊接缺陷提出了相应的解决措施。对于提高车身的螺柱焊接质量具有一定的指导作用。     

北京市公交车典型行驶工况的构建

选取北京市36条典型公交车行驶路线,用GPS进行了连续一周的车速采集,累计行程6000多公里,获取了100多万条行驶速度数据。运用聚类分析方法对样本数据进行初步分析,确定了所需的数据样本;再用MATLAB软件进行编程计算,对样本数据进行了整理和分析,最后构建了公交车辆道路行驶工况。对比分析表明它与欧洲地区的行驶工况存在一定的相关性。     

盾构平移过站施工技术

上海市轨道交通7号线12B标(长清路站～耀华路站区间)隧道工程,下行线盾构需要穿越轨道交通13号线的联络通道,推进过程中,需要在联络线处增加一次进出洞,且盾构平移过站100m。该文以此工程为例,探讨了盾构平移过站施工工艺。     

国内车用催化转化器模拟研究进展

简述了近年来国内催化转化器数值模拟的研究进展,列举了催化转化器常见的几种性能评价指标,包括催化转化器内的流场速度分布、压力损失、温度场和起燃特性等;分析了各自的影响因素,如催化转化器结构、载体结构和发动机排量等;阐明了催化转化器进一步研究的方向。     

汉口江滩防洪及环境综合整治工程

该文通过对汉口江滩防洪及环境综合工程的定位研究和设计案例,探讨了位于城市主核心区的滨江区域的功能定位和利用途径,以及城市防洪工程建设与休闲绿地营造相结合的新的模式,在满足城市防洪的前提下,为营造城市公共休闲绿地空间作了大胆的尝试。方案综合解决了城市防洪、生态保护、文化挖掘、绿地重建等问题,使汉口江滩成为生态江滩、活力江滩、文化江滩、炫彩江滩,满足了城市展示、市民需求的多种功能。     

发动机气门弹簧盖及锁片自动装配技术研究

本论文介绍了发动机气门弹簧盖及锁片自动化装配设备的组成及制造目标。简述了实现气门弹簧盖及锁片自动化装配设备制造目标的关键技术:自动上下料技术、压紧技术、防错技术等。最后给出了发动机气门弹簧盖及锁片装配设备的发展趋势,说明了自动化装配技术在发动机气门弹簧盖及锁片装配过程中的重要意义。     

汽车传动系统悬置的优化设计

建立汽车传动系统悬置的数学模型,并确定悬置系统隔振评价指标。通过对某汽车悬置系统的刚度的优化设计,系统固有频率稍有增加。各方向振动解耦度均大于90%。动力传动系统悬置y方向位移在3mm左右,较刚度匹配前的7.7mm大幅减小,悬置隔振效果大大提高。     

Dynamics Analysis of Torsional Vibration Induced by Clutch and Gear Set in Automatic Transmission

The torsional vibration generated during clutch engagement directly affects the shifting quality of automatic transmissions, where the noise source stems from both the clutch and the gear set. To predict the dynamical response and driveline oscillation, a comprehensive mathematical model of the vehicle powertrain equipped with automatic transmission is developed with consideration of nonlinearities in the clutch and the planetary gear set. For the clutch, the dynamics of stickslip is described for the transition between the slipping to locked states. The gear backlash model is used to analyze the rattle noise of the planetary gear set. Based on extensive powertrain simulations for the clutch engagement process, the magnitude of vibration propagation in the driveline are predicted to identify the primary factors of noise generation.     

Function Integration for Lightweight Chassis Based on Axiomatic Design and Design Structure Matrix

Function integration is the way used commonly to achieve the lightweight design system. To realize the design successfully by combing two systems multifaceted issues in need to be considered. The potential functional conflicts between the existing systems are the major unfavorable factors limiting the design. In order to complete the better design, the functional and physical relationships in the systems should be figured out. This paper proposes the approach, by which the function integration process is expressed using the axiomatic design. In the design process, the mutual relationships of design parameters in the systems are investigated by means of design matrices. The design concepts are compared and evaluated by the method combining the axiomatic design and design structure matrix.