某皮卡白车身模态分析

白车身模态参数是影响驾驶舒适性的重要指标,同时低阶弹性模态也反映了车身整体刚度性能。本文以某款皮卡白车身为对象,进行模态分析,以期获得白车身的200Hz以下模态的模态参数皮卡白车身的动态振动特性为避开共振频率,进行合理的结构设计提供依据。     

轻型载货汽车后桥轮毂螺栓疲劳强度分析

本文以某轻型载货汽车为例,对后桥轮毂螺栓进行疲劳强度分析,为后续设计工作提供方法和依据.     

Aerodynamic design optimization of rear body shapes of a sedan for drag reduction

This study proposes an aerodynamically optimized outer shape of a sedan by using an Artificial Neural Network (ANN), which focused on modifying the rear body shapes of the sedan. To determine the optimization variables, the unsteady flow field around the sedan driving at very fast speeds was analyzed by CFD simulation, and fluctuations of the drag coefficient (C _D ) and pressure around the car were calculated. After consideration of the baseline result of CFD, 6 local parts from the end of the sedan were chosen as the design variables for optimization. Moreover, an ANN approximation model was established with 64 experimental points generated by the D-optimal methodology. As a result, an aerodynamically optimized shape for the rear end of the sedan in which the aerodynamic performance is improved by about 5.64% when compared to the baseline vehicle is proposed. Finally, it is expected that within the accepted range of shape modifications for a rear body, the aerodynamic performance of a sedan can be enhanced so that the fuel efficiency of the sedan can be improved. The YF SONATA, a sedan manufactured by Hyundai Motors Corporate, played a major role in this research as the baseline vehicle.     

Actively translating a rear diffuser device for the aerodynamic drag reduction of a passenger car

This research aims to develop an actively translating rear diffuser device to reduce the aerodynamic drag experienced by passenger cars. One of the features of the device is that it is ordinarily hidden under the rear bumper but slips out backward only under high-speed driving conditions. In this study, a movable arc-shaped semi-diffuser device, round in form, is designed to maintain the streamlined automobile??s rear underbody configuration. The device is installed in the rear bumper section of a passenger car. Seven types of rear diffuser devices whose positions and protrusive lengths and widths are different (with the basic shape being identical) were installed, and Computational Fluid Dynamics (CFD) analyses were performed under moving ground and rotating wheel conditions. The main purpose of this study is to explain the aerodynamic drag reduction mechanism of a passenger car cruising at high speed via an actively translating rear diffuser device. The base pressure of the passenger car is increased by deploying the rear diffuser device, which then prevents the low-pressure air coming through the underbody from directly soaring up to the rear surface of the trunk. At the same time, the device generates a diffusing process that lowers the velocity but raises the pressure of the underbody flow, bringing about aerodynamic drag reduction. Finally, the automobile??s aerodynamic drag is reduced by an average of more than 4%, which helps to improve the constant speed fuel efficiency by approximately 2% at a range of driving speeds exceeding 70 km/h.     

自卸汽车的驾驶经验浅谈

自卸汽车驾驶员除了要遵守交通规则外,在驾驶操作上还要特别注意以下几点： 1、自卸汽车的起步与行驶。一般来说,自卸汽车车身高大,装有大功率柴油机。由于各厂家设计的举升机构各有不同,有的直接用手扳动操纵杆,有的在此基础上辅以压缩空气助力,这就使得操作也不尽相同。     

某载货汽车自燃的分析

本文首先通过驾驶员对自燃过程的描述和整车初查,确定起火区域。其次,通过对种种自燃原因的排除,确定该故障的起火点。最后,通过自燃的分析,识别设计、装调缺陷,提出预防方案。     

某重型混合动力垃圾车方案设计

本文以某传统6X4型柴油重卡为原型,根据国内混合动力商用车发展现状,经过合理匹配计算,设计一款混合动力6X4型垃圾车.     

基于模态分析的某皮卡发动机罩分析方法研究

对某皮卡发动机罩进行模态分析,要求避开共振区间,同时具有一定的弯曲刚度。对该发动机罩内板进行改进优化,对优化后的发动机罩进行弯曲刚度分析,分析结果满足设计要求。在整车上进行发动机罩模态测试,测试结果与分析结果误差在5%以内,证明了该发动机罩仿真模型的正确性;同时在后续的整车路试中,该发动机罩没有出现振动、开裂、凹陷等问题,进一步说明了该发动机罩分析方法的正确性。     

Optimisation of handling and traction in a rear wheel drive vehicle by means of magneto-rheological semi-active differential

This paper presents a semi-active differential, magneto-rheological fluid limited slip differential, which allows us to bias the torque between the driving wheels. It is based on the magneto-rheological fluid employment, by which it is possible to change, in a controlled manner, the internal friction torque and, consequently, the torque bias ratio. This device is an adaptive one and allows us to obtain an asymmetric torque distribution in order to improve vehicle handling. The device modelling and the control algorithm, realised for this activity, are described. The illustrated results highlight the advantages that are attainable regarding directional behaviour, stability, and traction.     

载重汽车组合梁焊接完整性分析

基于优化设计的思想,考虑焊点传力程度和焊点应力集中等综合因素,运用弹塑性有限元法,对载重汽车组合梁焊接联接进行完整性分析。以自卸式汽车为例,对两种焊接方案和焊点直径影响进行对比,得出了焊点数量、布局等对焊接组合梁承载能力的影响。     

一款小型电动环卫车的开发与设计

本文通过借鉴国内外整车开发经验,对一款箱式电动环卫车开发流程中的市场调研、整车方案设计与造型设计、整车各系统的结构设计与优化、样车试制与测试几个环节进行一定的介绍,为类似车辆的开发提供一定参考。     

An investigation of a semiactive suspension for a fork lift truck

This paper investigates the feasibility of a semiactive suspension of the cabin of a fork lift truck as a way of reducing the effect of harmful vibrations on the health of truck drivers. A suspension based on MR fluid dampers has been designed and implemented on an actual vehicle and heuristic control strategy has been developed, which preserves the filtering properties of the passive suspension when the vehicle moves in a straight line with a constant velocity and suppresses the large amplitude pitch and roll motion during turns and braking. Field tests have demonstrated a substantial comfort improvement with respect to the passive suspension, during the braking and turning phases, without any noticeable detrimental effects.     

某三轴载货车轴荷的优化设计

某三轴载货车在实际行驶时,出现了转向沉重、轮胎磨损严重等问题,究其原因是一、二桥轴荷相差大造成的。为了彻底解决双前桥轴荷不一致造成的影响,根据工程实际经验,本文利用一种轴荷计算方法,并结合企业实际情况,对车辆出现的问题提出了简单而有效的优化方案。优化后车辆的实测轴荷与理论计算值一致,且一、二桥的轴荷几乎相等,此方法的应用为同类车型的开发提供了设计依据。     

用工程仿真技术分析汽车水箱面罩开裂问题

首先简介了用大质量法计算强迫运动的理论，然后用ＭＳＣ／ＮＡＳＴＲＡＮ程序进行了ＥＱ１０９２汽车水箱面罩的强迫响应计算，并分析了计算结果。根据计算结果提出改进方案，被设计部门采用。     

Influence of compliance for an elastokinematic model of a proposed rear suspension

The research is carried out to improve passenger’s comfort to increase the vehicles stability in dynamic conditions. The literature available in the automotive engineering considers different topics for studying suspensions. An example represents mechanisms structure and analysis (synthesis, kinematics, and dynamics) under various operating conditions. These aspects have been approached before analytically, numerical. The current paper studies the influence of the lateral force on the contact patch of the wheel and the corresponding variations of vehicle stability parameters, such as camber angle and wheel rear track. The study is performed for a newer innovative rear suspensions mechanism which does not have a wheel track and camber angle variation, relative to the chassis, when the suspension components was considered rigid. A numerical solution is obtained through a virtual model on several commercial codes: MSC Adams, Patran, Nastran. Concerning the analysed parametes, their variation increases as the applied force is increased. Moreover, the largest variation corresponds to the case were elastic bushings and deformable links are considered.     

轻型货车横向振动分析与控制

采用有限元方法与实验模态分析技术，分析了轻型货车驾驶室和车架的横向耦合振动，通过对车架有限元模型进行动力优化分析，介绍了轻型货车横向振动的控制方法。     

某重型卡车全浮式驾驶室悬置系统设计

结合整车对全浮式驾驶室悬置系统的总体要求,利用理论计算、动力学仿真、有限元分析等方法进行各种工况模拟以及悬置性能分析,确保悬置系统各方面满足设计要求.实际样车在不同路况、速度下验证了悬置系统隔振率、平顺性、可靠性满足设计要求.通过对设计过程的总结,形成了一套驾驶室悬置系统设计方法、明确了性能评价指标和相关试验要求.     

基于一款皮卡的制动系统设计开发计算分析

汽车制动系统是汽车最重要系统之一,从汽车诞生时起,该系统在车辆的安全方面就扮演着至关重要的角色,特别是近年来,随着车辆技术的进步和汽车行驶速度的提高,这种重要性表现得越来越明显。汽车制动系统整车布置的合理性一直是影响制动效率及稳定性的主要因素,这就需要在整车项目开发过程中对制动系统各个部件的选型及整车制动管路的布置做到最优化选配,确保制动系统的可靠稳定,降低开发成本。