检索结果-南通市图书馆

Application of Dual-blade Stator to Low-speed Ratio Performance Improvement of Torque Converters

Chinese Journal of Mechanical Engineering 2016年第2期29卷 293-300页

作者： wu guangqiang WANG Lijun Automotive School Tongji University Institute of Industrial Science the University of Tokyo

With application of the lock-up clutch in the torque converter（TC）, fuel economy is not much determined by its high-speed ratio transmission efficiency. As a benefit, more researches are focused on its low-speed ratio performance so as to improve vehicle gradeability and launching acceleration performance. According to the results of computational fluid dynamics（CFD） analysis, hydrodynamic loss inside the stator cascade accounts for 42% of the total energy loss at stalling speed ratio. It is found that upstream flow with large impingement angle results in boundary layer separation at the leading edge, which aggregates hydrodynamic loss and decreases circular flow rate dramatically at low-speed ratio. In this paper, a dual-blade stator is proposed to suppress the boundary layer separation, which is parameterized by using the non-uniform rational B spline（NURBS） method. The mean camber line and blade profile curve are expressed by a three control points quadratic open NURBS and a cubic closed one respectively. The key design parameters included the slot width and suction side shape of the primary blade are analyzed. The most effective slot width is found to be between 4% and 8% chord length, and the boundary layer separation can be suppressed completely by decreasing distribution of momentum moment at the primary blade and adding it to the leading edge of the secondary blade. As a result, circular flow rate and impeller torque capacity is increased by 17.9% and 9.6% respectively at stalling speed ratio, meanwhile, low-speed ratio efficiency is also improved. Maximum efficiency at high-speed ratio decreases by 0.5%, which can be ignored as the work of lock-up clutch. This research focuses on using the dual-blade stator to optimize low-speed ratio performance of the TC, which is benefit to vehicle power performance.

关键词： torque converter dual-blade stator boundary layer separation non-uniform rational B spline

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

SYSTEM FOR TORQUE CONVERTER DESIGN AND ANALYSIS BASED ON CAD/CFD INTEGRATED PLATFORM

引用

Chinese Journal of Mechanical Engineering 2008年第4期21卷 35-39页

作者： wu guangqiang YAN Peng College of Automotive Tongji UniversityShanghai 201804 China

A 3D torque converter design system is developed based on numerical investigation into flow field and CAD technology. The 3D steady-state flow field simulation is undertaken by using time averaged Reynolds equation and k-epsilon turbulence model, with mixing-plane boundary conditions at three section interfaces. The blades are designed according to the flow field characteristics by using a reverse design method in the system. The accurateness of numerical analysis and the validity of design system are verified by the fluid field experiment of desingn example of the torque converter. This kind of design and analysis system for torque converter based on integration of comput ationol fluid dynamics （CFD） and CAD is a powerful tool for torque converter manufacturing, but also a prettg important significance for research and development.

关键词： Torque converter Flow field investigation Secondary flow

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Shifting Rule Modification Strategy of Automatic Transmission Based on Driver-vehicle-road Environment

引用

Chinese Journal of Mechanical Engineering 2010年第3期23卷 346-352页

作者： wu guangqiang ZHANG Deming School of Automobile Tongii University Shanghai 201804 China Institute of Industrial Science the University of Tokyo Tokyo 153-8505 Japan

Accidental or frequent shift often occurs when the shifting rule is built based on traditional two parameters （i.e., velocity and throttle）, because the speed of engine varies slower than change of throttle opening. Currently, modifying shift point velocity value or throttle by throttle change rate is one of common methods, but the results are not so satisfactory in some working condition such as uphill. The reason is that these methods merely consider throttle change rate which is not enough for a car driving in driver-vehicle-road environment system. So a novel fuzzy control modification strategy is proposed to avoid or reduce those abnormal shift actions. It can adjust shifting rule by the change rate of throttle, current gear position and road environment information, while different gear position and driving environment get corresponding modification value. In order to compare the results of shifting actions, fuel consumption and braking distance, emergent braking in level road and extra-urban driving cycle（EUDC） working conditions with fuzzy shifting schedule modification strategy are simulated digitally. Furthermore, a hardware-in-the-loop simulation platform is introduced to verify its effect in slope road condition according to the ON/OFF numbers of solenoid valve in hydraulic system. The simulation results show that the problem of unexpected shift in those working conditions may be resolved by fuzzy modification strategy. At last, it is concluded that although there is some slight decline in power performance in uphill situation, this fuzzy modification strategy could correctly identify slope of road, decrease braking distance, improve vehicle comfort and fuel economy effectively and prolong the life of clutch system. So, this fuzzy logic shifting strategy provides important references for vehicle intelligent shifting schedule.

关键词： shifting rule modification strategy fuzzy logic control simulation and hardware-in-the-loop experiments

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Multidisciplinary Design Optimization of Vehicle Instrument Panel Based on Multi-objective Genetic Algorithm

引用

Chinese Journal of Mechanical Engineering 2013年第2期26卷 304-312页

作者： WANG Ping wu guangqiang Automotive School Tongji University Institute of Industrial Science the University of Tokyo

Typical multidisciplinary design optimization（MDO） has gradually been proposed to balance performances of lightweight, noise, vibration and harshness（NVH） and safety for instrument panel（IP） structure in the automotive development. Nevertheless, plastic constitutive relation of Polypropylene（PP） under different strain rates, has not been taken into consideration in current reliability-based and collaborative IP MDO design. In this paper, based on tensile test under different strain rates, the constitutive relation of Polypropylene material is studied. Impact simulation tests for head and knee bolster are carried out to meet the regulation of FMVSS 201 and FMVSS 208, respectively. NVH analysis is performed to obtain mainly the natural frequencies and corresponding mode shapes, while the crashworthiness analysis is employed to examine the crash behavior of IP structure. With the consideration of lightweight, NVH, head and knee bolster impact performance, design of experiment（DOE）, response surface model（RSM）, and collaborative optimization（CO） are applied to realize the determined and reliability-based optimizations, respectively. Furthermore, based on multi-objective genetic algorithm（MOGA）, the optimal Pareto sets are completed to solve the multi-objective optimization（MOO） problem. The proposed research ensures the smoothness of Pareto set, enhances the ability of engineers to make a comprehensive decision about multi-objectives and choose the optimal design, and improves the quality and efficiency of MDO.

关键词： instrument panel(IP) NVH safety multidisciplinary design optimization multi-objective optimization

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Parameter influence law analysis and optimal design of a dual mass flywheel

引用

International Journal of Mechanical System Dynamics 2022年第2期2卷 165-177页

作者： guangqiang wu Guoqiang Zhao School of Automobile Studies Tongji UniversityShanghaiChina Institute of Industrial Science The University of TokyoTokyoJapan

The influence of the dynamic parameters of a dual mass flywheel(DMF)on its vibration reduction performance is analyzed,and several optimization algorithms are used to carry out multiobjective DMF optimization ***,the vehicle powertrain system is modeled according to the parameter configuration of the test *** accuracy of the model is verified by comparing the simulation data with the test ***,the model is used to analyze the influence of the moment of inertia ratio,torsional stiffness,and damping in reducing DMF *** speed fluctuation amplitude at the transmission input shaft and the natural frequency of the vehicle are taken as the optimization *** passive selection method,multiobjective particle swarm optimization,and the nondominated sorting genetic algorithm based on an elite strategy are used to carry out DMF multiobjective optimization *** advantages and disadvantages of these algorithms are evaluated,and the best optimization algorithm is selected.

关键词： dual mass flywheel vehicle powertrain system multiobjective optimization multiobjective particle swarm optimization nondominated sorting genetic algorithm based on an elite strategy

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Ride comfort evaluation for road vehicle based on rigid-flexible coupling multibody dynamics

引用

Theoretical & Applied Mechanics Letters 2013年第1期3卷 39-43页

作者： guangqiang wu Guodong Fan Jianbo Guo Automotive School Tongji University

In the present research two different whole vehicle multibody models are established respectively, including rigid and rigid-flexible coupling multibody vehicle models. The former is all composed by rigid bodies while in the later model, the flexible rear suspension is built based on the finite element method （FEM） and mode superposition method, in which the deformations of the components are considered. The ride simulations with different speeds are carried out on a 3D digitalized road, and the weighted root mean square （RMS） of accelerations on the seat surface,backrest and at the feet are calculated. The comparison between the responses of the rigid and rigid-flexible coupling multibody models shows that the flexibility of the vehicle parts significantly affects the accelerations at each position, and it is necessary to take the flexibility effects into account for the assessment of ride comfort. C 2013 The Chinese Society of Theoretical and Applied Mechanics. [doi： 10.1063/2.1301304]

关键词： ride comfort rigid-flexible coupling multibody system

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

适合云存储的访问策略可更新多中心CP-ABE方案

引用

计算机研究与发展 2016年第10期53卷 2393-2399页

作者：吴光强暨南大学信息科学技术学院广州510632

云存储作为一种新型的数据存储体系结构,近年来得到越来越广泛的应用.大多数用户为了降低本地存储开销、实现数据共享选择将自己的数据上传到云服务器存储.然而,云存储系统存在的安全隐患也引发了社会越来越多的担忧.例如,不完全可信的... 详细信息

云存储作为一种新型的数据存储体系结构,近年来得到越来越广泛的应用.大多数用户为了降低本地存储开销、实现数据共享选择将自己的数据上传到云服务器存储.然而,云存储系统存在的安全隐患也引发了社会越来越多的担忧.例如,不完全可信的云服务提供商可能会窃取用户的数据或让未授权的其他用户访问数据等.因此,对用户数据进行加密并实现数据的访问控制是确保云存储中数据安全的有效方法.基于密文的属性加密(CP-ABE)方案则能够很好地实现安全云存储目标,它允许一个发送者加密数据并设置访问控制结构,只有符合条件的用户才能对数据进行解密.但是,传统CP-ABE方案中存在的密钥泄露等问题制约了属性加密在云存储系统中的应用.针对上述的问题,提出了一个多授权机构支持策略更新的CP-ABE方案,该方案与之前的方案相比,不仅可以通过多授权机构避免密钥泄露问题,同时将策略更新及密文更新过程交给服务器执行,有效地降低了本地的计算开销和数据传输开销,充分利用云存储的优势提供一个高效、灵活的安全数据存储方案,对所提方案进行了安全性证明,并对方案进行了效率分析.

关键词：云存储访问控制基于密文的属性加密多授权机构策略更新

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

离心摆吸振器及其在大转角扭转减振器上的应用

引用

汽车工程 2017年第12期39卷 1409-1416,1471页

作者：吴虎威吴光强同济大学汽车学院上海201804 东京大学生产技术研究所

本文旨在对离心摆吸振器原理及其在大转角扭转减振器中的应用进行研究。首先,创新性地提出将离心摆安装于减振器从动盘毂上,分析了离心摆吸振器的减振原理,并推导了相应的数学方程;然后,在专用台架上进行试验,测得新型大转角离合器转矩... 详细信息

本文旨在对离心摆吸振器原理及其在大转角扭转减振器中的应用进行研究。首先,创新性地提出将离心摆安装于减振器从动盘毂上,分析了离心摆吸振器的减振原理,并推导了相应的数学方程;然后,在专用台架上进行试验,测得新型大转角离合器转矩传递特性;接着,利用集中质量建模方法,建立车辆动力传动系统扭转振动与变速器齿轮敲击的振敲耦合模型和整车纵向运动与受力分析模型,对比分析带与不带离心摆吸振器的大转角减振器性能。最后,利用实车试验分析大转角扭转减振器性能和验证数值仿真模型的有效性。

关键词：离心摆吸振器大转角扭转减振器齿轮敲击声

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

机械变速器齿轮敲击现象建模及其影响因素

引用

同济大学学报（自然科学版） 2016年第1期44卷 136-145页

作者：吴虎威吴光强同济大学汽车学院上海201804 东京大学生产技术研究所

利用车辆基本参数和实车传动系统各部件的等效转动惯量、扭转刚度和阻尼扭转特性参数,建立了包含LuGre轮胎模型在内的传动系统非线性扭转振动和车辆纵向平移运动耦合模型.利用耦合模型再现了车辆处于一挡加速工况下各非承载齿轮对的敲... 详细信息

利用车辆基本参数和实车传动系统各部件的等效转动惯量、扭转刚度和阻尼扭转特性参数,建立了包含LuGre轮胎模型在内的传动系统非线性扭转振动和车辆纵向平移运动耦合模型.利用耦合模型再现了车辆处于一挡加速工况下各非承载齿轮对的敲击情况,并分析了各非承载齿轮对敲击强度的主要影响因素.结果表明,合理设计各挡位齿轮对齿侧间隙和等效转动惯量大小可有效抑制机械变速器齿轮敲击现象.

关键词： LuGre轮胎模型非线性扭转振动耦合模型齿侧间隙等效转动惯量

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

基于准瞬态发动机模型的车辆传动系统特性分析

引用

振动与冲击 2016年第24期35卷 175-182页

作者：吴虎威吴光强同济大学汽车学院上海201804 东京大学生产技术研究所

研究了怠速工况下车辆传动系统动力学特性和机械变速器齿轮敲击建模方法,并通过实车实验验证了研究方法的有效性。首先,利用实车装备的直列四缸四冲程发动机特性参数,建立了考虑动态摩擦扭矩特性的准瞬态发动机模型;其次,利用集中质量... 详细信息

研究了怠速工况下车辆传动系统动力学特性和机械变速器齿轮敲击建模方法,并通过实车实验验证了研究方法的有效性。首先,利用实车装备的直列四缸四冲程发动机特性参数,建立了考虑动态摩擦扭矩特性的准瞬态发动机模型;其次,利用集中质量建模方法,建立怠速工况下车辆动力传动系统动力学模型,模型中详细建立机械变速器空套齿轮阻滞力矩模型,仿真分析了传动系统各部件的运动特性和齿轮对敲击强度。最后,利用实车怠速工况下的实验结果,验证了准瞬态发动机模型和车辆动力传动系统仿真模型的有效性,研究成果可进一步用于车辆动力传动系统设计开发和变速器齿轮敲击产生机理研究。

关键词：齿轮敲击准瞬态发动机模型阻滞力矩模型实车实验

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：