期刊文献+
共找到13篇文章
< 1 >
每页显示 20 50 100
CFD应用与车辆空气动力学特性的研究 被引量:6
1
作者 常思勤 《武汉汽车工业大学学报》 CAS 1999年第1期15-19,共5页
应用CFD方法进行车辆外部流场的数值模拟,可以获得任意截面与位置上的流速、压力等参数,不仅可以求得气动阻力系数等车辆空气动力学特性参数的大小,而且可以进一步分解各组成部分。介绍了近年所做的有关研究工作的进展并讨论了进... 应用CFD方法进行车辆外部流场的数值模拟,可以获得任意截面与位置上的流速、压力等参数,不仅可以求得气动阻力系数等车辆空气动力学特性参数的大小,而且可以进一步分解各组成部分。介绍了近年所做的有关研究工作的进展并讨论了进一步的应用前景。在数值模拟中考虑了气体的可压缩性以提高计算精度,应用了所提出的组合网格划分方法,自行开发了大规模的三维流动数值模拟计算软件并通过计算实例进行验证,同时在实用化方面作了较大的努力。 展开更多
关键词 计算流体力学 车辆空气动力 三维流动模拟
下载PDF
基于流固耦合的厢式中置轴挂车联合仿真
2
作者 周庆辉 邱宇航 苏永元 《浙江工业大学学报》 北大核心 2024年第1期68-76,共9页
厢式货车的迎风面积较大,在强风天气高速行驶有很大安全隐患,结构参数是影响车辆空气动力学的因素之一。基于Fluent和TruckSim单向耦合的方法,建立厢式中置轴挂车的空气动力学和多体动力学流固耦合联合仿真模型。通过计算流体动力学(Com... 厢式货车的迎风面积较大,在强风天气高速行驶有很大安全隐患,结构参数是影响车辆空气动力学的因素之一。基于Fluent和TruckSim单向耦合的方法,建立厢式中置轴挂车的空气动力学和多体动力学流固耦合联合仿真模型。通过计算流体动力学(Computational fluid dynamics,CFD)对厢式中置轴挂车进行气动特性分析,运用多体动力学模型进行侧风稳定性验证。利用可实现k—ε湍流模型进行数值模拟,得到厢式中置轴挂车双力矩中心处的气动系数曲线。建立气动系数的数学模型作为联合仿真的接口,仿真结果表明挂车与牵引车车厢之间的间隙对挂车气动特性有一定影响。以横摆角速度和侧向加速度作为评价指标,发现当车速为80 km/h时,间隙越大车辆越不稳定;当车速为40 km/h时,间隙越大可有效提高车辆的行驶稳定性。因此,提出用可伸缩牵引杆来解决中置轴挂车行驶稳定性的方法。研究结果可为考虑空气动力学设计的多节车厢类挂车提供参考。 展开更多
关键词 车辆空气动力 厢式中置轴挂车 侧风稳定性 数值模拟
下载PDF
劳斯莱斯闪灵
3
《汽车观察》 2024年第3期9-10,共2页
车身外观传承了幻影双门轿跑车的标志性设计,帕特农神庙式进气格栅依然得到保留,经典的“欢庆女神”雕像经过重新设计,令车辆空气动力学表现更佳。闪灵整车的风阻系数仅0.25,成为空气动力学表现最佳的劳斯莱斯车型。搭载了全新设计的SPI... 车身外观传承了幻影双门轿跑车的标志性设计,帕特农神庙式进气格栅依然得到保留,经典的“欢庆女神”雕像经过重新设计,令车辆空气动力学表现更佳。闪灵整车的风阻系数仅0.25,成为空气动力学表现最佳的劳斯莱斯车型。搭载了全新设计的SPIRIT奢华数字架构可对汽车各项功能进行管理,并与Whispers应用程序实现全面互联。提供了定制化“奢华架构”3.0架构,该架构根据纯电动劳斯莱斯车型的需求进行定制,令其与动力总成的匹配更具便捷性。精密的挤压铝型材、电池集成于该空间框架之中,使闪灵比以往的劳斯莱斯汽车刚度提高了30%。 展开更多
关键词 劳斯莱斯 进气格栅 风阻系数 车辆空气动力 车身外观 动力总成 空间框架 应用程序
下载PDF
我国风工程研究现状与展望 被引量:22
4
作者 贺德馨 《力学与实践》 CSCD 北大核心 2002年第4期10-19,共10页
介绍了我国风工程的现状,提出了在大气边界层内风特性,风对建筑物的作用,风对桥梁的作用,车辆空气动力特性,风力机空气动力特性,风引起的污染扩散和质量迁移等研究中尚待解决的主要问题.
关键词 风工程 研究现状 中国 内风特性 车辆空气动力 质量迁移
下载PDF
开放式喷射汽车风洞的尺寸和效率
5
作者 E.MERCKER R.BLUMRICH +1 位作者 J.WIEDEMANN F.WITTMEIER 《同济大学学报(自然科学版)》 EI CAS CSCD 北大核心 2022年第S01期79-88,共10页
近年来,世界各地汽车企业已建成许多汽车风洞,并在不久的将来会有更多汽车风洞的规划与建设。在风洞规划设计阶段确定的许多功能与参数决定了其整个运行生命周期,并影响建设和运行成本。本文研究通过适当选择3/4开口风洞的试验段几何尺... 近年来,世界各地汽车企业已建成许多汽车风洞,并在不久的将来会有更多汽车风洞的规划与建设。在风洞规划设计阶段确定的许多功能与参数决定了其整个运行生命周期,并影响建设和运行成本。本文研究通过适当选择3/4开口风洞的试验段几何尺寸,可以使早期的传统风洞中因有限截面发生的流动干扰在很大程度上得到补偿或减少到可忽略不计的程度。研究表明:对于具有不同堵塞度的各种车辆,流动干扰误差出乎意料地可以忽略,因此不需要对试验数据进行修正,这使得汽车风洞试验形成“自由”气流条件;试验阶段的初步尺寸可以比如今常见的情况小很多,也不影响测量结果的准确度,这带来了更低的建设成本,也降低了风洞系统运行的能源需求;自由射流的不稳定性必须被考虑,且射流长度不应该超过某个上限。 展开更多
关键词 汽车风洞 干扰效应 车辆空气动力
下载PDF
《铁道学报》2016年报道重点
6
作者 本刊编辑部 《铁道学报》 EI CAS CSCD 北大核心 2016年第2期140-140,共1页
根据铁路科技发展规划及科研进展情况,本刊重点征集及选登具有以下内容的原创性学术论文及综述。铁路运输及经济:铁路运输组织和运营管理;铁路站场;路网规划及运输能力协调配置;列车运行图的计算机联网编制;铁路重载运输组织;高速铁路... 根据铁路科技发展规划及科研进展情况,本刊重点征集及选登具有以下内容的原创性学术论文及综述。铁路运输及经济:铁路运输组织和运营管理;铁路站场;路网规划及运输能力协调配置;列车运行图的计算机联网编制;铁路重载运输组织;高速铁路或铁路客运专线的运输组织;调度指挥的智能化。 展开更多
关键词 铁路机车车辆 铁路运输组织 铁道学报 铁路重载运输 列车运行图 高速动车组 车辆空气动力 车辆动力 铁路站场 路网规划
下载PDF
《铁道学报》2017年报道重点
7
作者 本刊编辑部 《铁道学报》 EI CAS CSCD 北大核心 2017年第6期54-54,共1页
根据铁路科技发展规划及科研进展情况,本刊重点征集及选登具有以下内容的原创性学术论文及综述。
关键词 铁路机车车辆 铁路运输组织 铁道学报 铁路重载运输 列车运行图 高速动车组 车辆空气动力 车辆动力 铁路站场 路网规划
下载PDF
Dynamic behaviors and mitigation measures of a train passing through windbreak transitions from ground to cutting 被引量:2
8
作者 CHEN Zheng-wei LIU Tang-hong +3 位作者 GUO Zi-jian HUO Xiao-shuai LIWen-hui XIAYu-tao 《Journal of Central South University》 SCIE EI CAS CSCD 2022年第8期2675-2689,共15页
In this paper,the effects of a right-angle windbreak transition(RWT)from the flat ground to cutting on train aerodynamic and dynamic responses were investigated,then a mitigation measure,an oblique structure transitio... In this paper,the effects of a right-angle windbreak transition(RWT)from the flat ground to cutting on train aerodynamic and dynamic responses were investigated,then a mitigation measure,an oblique structure transition(OST)was proposed to reduce the impact of RWT on the train aerodynamic and dynamic performance.The results showed that in the RWT region,the airflow was divided into two parts.One part of the airflow induced a strong backflow in the flat ground position,and the other part of the airflow induced a strong backflow in the cutting position.Therefore,there were two lateral impacts on the train.For the head car with the OST,the drop ratios of the peak-to-peak values compared with RWT were 47%,40%,and 52%for the side force coefficient C_(Fy),lift force coefficient C_(Fz) and overturning moment coefficient C_(Mx),respectively.For the peak-to-peak value of the dynamic parameters,the drop ratios of OST compared with RWT were all larger than 50%.The maximum dynamic overturning coefficients for RWT and OST were 0.75 and 0.3,respectively. 展开更多
关键词 high-speed train windbreak wall CROSSWIND CFD train aerodynamics vehicle system dynamics
下载PDF
Lateral aerodynamic performance and speed limits of double-deck container vehicles with different structures 被引量:2
9
作者 李燕飞 田红旗 《Journal of Central South University》 SCIE EI CAS 2012年第7期2061-2066,共6页
Based on 3D, steady N-S equations and k-e turbulence model, Fluent was employed to do numerical simulation for lateral aerodynamic performance of 6-axis X2K double-deck container trains with two different loading form... Based on 3D, steady N-S equations and k-e turbulence model, Fluent was employed to do numerical simulation for lateral aerodynamic performance of 6-axis X2K double-deck container trains with two different loading forms, and speed limits of the freight trains were studied. The result indicates that under wind environment: 1) As for vehicles without and with cross-loaded structure, aero-pressure on the former is bigger, but air velocity around the latter is larger; 2) When sideslip angle θ=0°, the airflow is symmetry about train vertical axis; when θ〉0°, the airflow is detached at the top of vehicles, and the air velocity increases above the separated line but decreases below it; 3) With θ increasing, the lateral force on the mid vehicle firstly increases but decreases as θ=75°; 4) When the 6-axis X2K fiat car loads empty boxes of a 40 ft and a 48 ft at 120 km/h, the overturning wind speed is 25.19 m/s, and the train should be stopped under the 12th grade wind speed. 展开更多
关键词 numerical simulation 6-axis X2K flat car loading form lateral aerodynamic performance speed limit
下载PDF
观致3 NGR 改装车赛道体验
10
作者 卫东 《汽车与运动》 2017年第7期162-165,共4页
这款改装版观致3的1.6T发动机配6挡双离合变速器的动力组合爆发出的动力还是很猛的,直接带着我冲入了赛道在古希腊神话中给我留下印象最深的就是半人半兽的森林之神萨堤洛斯(Satyrs),而眼前的这辆改装的NGR版观致3就像是那位森林之神... 这款改装版观致3的1.6T发动机配6挡双离合变速器的动力组合爆发出的动力还是很猛的,直接带着我冲入了赛道在古希腊神话中给我留下印象最深的就是半人半兽的森林之神萨堤洛斯(Satyrs),而眼前的这辆改装的NGR版观致3就像是那位森林之神的化身,首先单从外观涂装上看,它既保留着原装的车身后部着色,也有着赛车风格的车身前部着色,寓意着它是赛车与原型车的混合体。从外观上还可以看到众多的赛车运动套件, 展开更多
关键词 原型车 改装车 萨堤洛斯 NGR 古希腊神话 装版 车辆空气动力 操控性能 量产车 家庭轿车
原文传递
Multi-objective optimization design method of the high-speed train head 被引量:22
11
作者 Meng-ge YU Ji-ye ZHANG Wei-hua ZHANG 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2013年第9期631-641,共11页
With the continuous improvement of the train speed, the dynamic environment of trains turns out to be aerodynamic domination. Solving the aerodynamic problems has become one of the key factors of the high-speed train ... With the continuous improvement of the train speed, the dynamic environment of trains turns out to be aerodynamic domination. Solving the aerodynamic problems has become one of the key factors of the high-speed train head design. Given that the aerodynamic drag is a significant factor that restrains train speed and energy conservation, reducing the aerodynamic drag is thus an important consideration of the high-speed train head design. However, the reduction of the aerodynamic drag may increase other aerodynamic forces (moments), possibly deteriorating the operational safety of the train. The multi-objective optimization design method of the high-speed train head was proposed in this paper, and the aerodynamic drag and load reduction factor were set to be optimization objectives. The automatic multi-objective optimization design of the high-speed train head can be achieved by integrating a series of procedures into the multi-objective optimization algorithm, such as the establishment of 3D parametric model, the aerodynamic mesh generation, the calculation of the flow field around the train, and the vehicle system dynamics. The correlation between the optimization objectives and optimization variables was analyzed to obtain the most important optimization variables, and a further analysis of the nonlinear relationship between the key optimization variables and the optimization objectives was obtained. After optimization, the aerodynamic drag of optimized train was reduced by up to 4.15%, and the load reduction factor was reduced by up to 1.72%. 展开更多
关键词 High-speed train Multi-objective optimization Parametric model Aerodynamic drag Load reduction factor
原文传递
A Study of Maneuvering Control for an Air Cushion Vehicle Based on Back Propagation Neural Network 被引量:5
12
作者 卢军 黄国樑 李姝芝 《Journal of Shanghai Jiaotong university(Science)》 EI 2009年第4期482-485,共4页
A back propagation (BP) neural network mathematical model was established to investigate the maneuvering control of an air cushion vehicle (ACV). The calculation was based on four-freedom-degree model experiments ... A back propagation (BP) neural network mathematical model was established to investigate the maneuvering control of an air cushion vehicle (ACV). The calculation was based on four-freedom-degree model experiments of hydrodynamics and aerodynamics. It is necessary for the ACV to control the velocity and the yaw rate as well as the velocity angle at the same time. The yaw rate and the velocity angle must be controlled correspondingly because of the whipping, which is a special characteristic for the ACV. The calculation results show that it is an efficient way for the ACV's maneuvering control by using a BP neural network to adjust PID parameters online. 展开更多
关键词 air cushion vehicle four degree of freedom back propagation (BP) neural network. PID control
原文传递
Vehicle height and leveling control of electronically controlled air suspension using mixed logical dynamical approach 被引量:7
13
作者 SUN Xiao Qiang CAI Ying Feng +2 位作者 YUAN Chao Chun WANG Shao Hua CHEN Long 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2016年第12期1814-1824,共11页
Vehicle height and leveling control of electronically controlled air suspension(ECAS) still poses theoretical challenges for researchers that have not been adequately addressed in prior research. This paper investigat... Vehicle height and leveling control of electronically controlled air suspension(ECAS) still poses theoretical challenges for researchers that have not been adequately addressed in prior research. This paper investigates the design and verification of a new controller to adjust the vehicle height and to regulate the roll and pitch angles of the vehicle body(leveling control) during the height adjustment procedures. A nonlinear mechanism model of the vehicle height adjustment system is formulated to describe the dynamic behaviors of the system. By using mixed logical dynamical(MLD) approach, a novel control strategy is proposed to adjust the vehicle height by controlling the on-off statuses of the solenoid valves directly. On this basis, a correction algorithm is also designed to regulate the durations of the on-off statuses of the solenoid valves based on pulse width modulated(PWM) technology, thus the effective leveling control of the vehicle body can be guaranteed. Finally, simulations and vehicle tests results are presented to demonstrate the effectiveness and applicability of the proposed control methodology. 展开更多
关键词 electronically controlled air suspension vehicle height control leveling control hybrid system mixed logical dynamical approach
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部