共查询到20条相似文献，搜索用时 140 毫秒
1.
自动变速器原理与维修是汽车新结构技术教学的一个重要内容。目前,自动变速器普遍采用的是SIMPSON(辛普森)型行星轮系机构,如丰田A43DE型自动变速器,就由一排超速行星齿轮和一组辛普森行星轮系构成。与平行轴变速器的齿轮机构相比,行星齿轮机构有其独有特点:(1)传动的原理较为复杂。行星轮自转又公转,传动比的计算较定轴轮系复杂。(2)传动的形式复杂。如奥迪100变速器采用的是两轴式变速器,传动的线路比较简单。单排行星轮系就有6种运动状态,而丰田A43DE型自动变 相似文献
2.
为帮助学生理解行星齿轮机构在不同工作状态下的运动形式,并验证行星齿轮机构的传动比公式,研究设计了一套包括机械机构和采集系统两部分的行星齿轮机构运动演示教具。行星齿轮机构由12V电机驱动,通过传感器及自编的Lab VIEW数据采集程序实时获取机构的运动参数,计算出实际传动比,并与理论数据对比。试验表明,该教具设计合理,小巧便携,能够直观演示行星齿轮机构运动状态。 相似文献
3.
《江西电力职业技术学院学报》2017,(2)
介绍了单排单行星齿轮机构运动规律特性方程式,分析了丰田A340E自动变速箱档位分布情况,研究出丰田A340E自动变速箱各档位与执行元件关系的分析技巧,通过传动比的计算验证基于特性方程式下的自动变速箱档位分析技巧的准确性。 相似文献
4.
5.
《武汉工程职业技术学院学报》2020,(2)
通用GF6是典型的6档手自一体自动变速器,行星齿轮变速传动机构结构复杂,档位分析难度较大,因此以行星齿轮变速传动机构的结构和各换挡执行元件的安装位置为基础,通过分析推理法来分析各档位,并针对分析推理法难以分析三排行星齿轮机构组合实现档位的情况,提出假设分析法,在不必计算出传动比大小的情况下,通过输出轴转速高低的变化,准确判断出自动变速器某档位的换挡执行元件选择是否准确,对研究6档及以上自动变速器的学者提供新的分析方法和思路。 相似文献
6.
屈亚锋 《武汉工程职业技术学院学报》2018,(1)
通用AF40-6是一款多排串联复合式行星齿轮自动变速器,结构复杂,档位分析比较难,学生理解困难,因此,利用单、双行星齿轮机构特性方程式,结合不同运动方式的应用情况,通过分析各档位传动比大小的范围,研究出通用AF40-6自动变速器各档位最优化换档执行元件选择的方法,并且计算出各档位传动比,对其他研究自动变速器的学者有一定的参考价值。 相似文献
7.
在汽车机械教学过程中,使用Autodesk Inventor软件,制作行星齿轮机构三维模型,演示仿真动作,能提高授课效率,降低学习难度。运用计算机辅助教学,优化教学效果,能帮助学生了解齿轮变速机构的结构,理解换挡变速的原理,学习装配基础知识。 相似文献
8.
为了获取差速器齿轮机构在多体动力学条件下的受力情况,以某款轿车使用的差速器为研究对象,利用三维绘图软件UG建立该差速器结构模型,并导入到ADAMS软件中,根据齿轮接触理论,添加合适的约束与载荷,建立齿轮机构刚体模型。在多体系统动力学理论的指导下,在ADAMS软件中建立行星齿轮的柔性体模型,从而得到差速器传动机构的刚柔耦合模型,并进行直线行驶和转向两种工况下的力学仿真分析。分析结果表明:在两种工况下行星齿轮与半轴齿轮接触位置的最大应力分别为377.15MPa和849.11MPa,均小于材料的许用应力;同时也得到了实际工作中行星齿轮应力最大的10个热点。这为后期齿轮的优化设计提供了一定的技术支持。 相似文献
9.
文章首先介绍了目前混合动力技术的分类和研究概况。在介绍自行设计的双离合器、传动控制箱和行星齿轮机构为基础的改进传动系统的基础上,分析了混合动力汽车的5种根据车况可自动切换的工作模式和利用变频器对交流永磁同步电机进行控制的方式。讨论了以PLC控制器主、以单片机控制为辅的混合动力电动汽车控制方案。最后,对混合动力的研发进行了总结和展望。 相似文献
10.
11.
This paper is aimed to propose an approach to predict the dynamic characteristics of ring-plate planetary indexing cam mechanism,
which is a novel type of indexing mechanism that employs internal planetary transmission structure. Firstly, the geometry
and structure of the mechanism are discussed and the kinematic practicability is simulated with virtual prototype design.
Then a 3D finite element model of the ring-plate planetary indexing cam mechanism is developed with the commercial software
of MATLAB and ANSYS. Through the finite element analysis, the natural frequencies and the corresponding mode shapes are predicted
in one motion cycle. On the basis of the virtual prototype design and finite element analysis, an experimental prototype is
made and tested to validate the prediction of the dynamic characteristics. The agreement between experimental results and
the finite element analysis testifies that the finite element model developed is applicable to the prediction of the dynamic
characteristics of this type of mechanism. 相似文献
12.
Ted Richards 《Science & Education》2012,21(6):899-910
This paper describes a method for teaching planetary retrograde motion, and the Ptolemaic and Copernican accounts of retrograde motion, by means of a series kinesthetic learning activities (KLAs). In the KLAs described, the students literally walk through the motions of the planets in both systems. A retrospective statistical analysis shows that students who participated in these activities performed better on examination questions pertaining to retrograde motion than students who did not. Potential explanations for this result, including the breaking of classroom routine, the effect of body movement on conceptual memory, and egocentric spatial proprioception, are considered. 相似文献
13.
Design of virtual environments for the comprehension of planetary phenomena based on students' ideas
Children enter the classroom with a wide range of misconceptions about planetary phenomena. Conventional teaching methods usually cannot overcome these difficulties, which we consider may be because of the lack of appropriate teaching aids. The purpose of the present study is the design and development of an educational virtual environment for the support of the teaching of planetary phenomena, particularly of the movements of the Earth and Sun, the day and night cycle and the change of seasons. Our interactive three-dimensional (3D) virtual environment was based on the results of an empirical study of 102 secondary school students and provides students with new experiences, personal involvement and close-up examination of the phenomena under study. Our first results after the use of the virtual environment showed that the majority of students enthused about interacting with it and modified their misconceptions concerning the day-night cycle and the change of seasons. 相似文献
14.
Stephen Sharp 《Assessment & Evaluation in Higher Education》2006,31(3):329-343
The use of group work, in which three or more students jointly produce a piece of work for summative assessment, is an established aspect of teaching and learning in higher education. Opinions vary however about whether their marks should vary according to the respective contributions they made to the work. This paper is based on the assumption that if adjustments are to be made, they should be made on sound statistical grounds. Current methods for adjusting student marks do not allow the size of the adjustments to be controlled and empirical data are presented which show that very large adjustments can occur. This paper presents a method for deriving final student marks from a single tutor mark and ratings which students make of each other’s contributions. The method incorporates a mechanism for directly controlling the size of the adjustments made. It is demonstrated using data from students following a degree programme in computing. A spreadsheet has been written which undertakes the calculations necessary to apply the method. 相似文献
15.
张念 《暨南大学华文学院学报》2011,(3):44-50
本文以作文语料为基础,考察西班牙学生汉语定语使用情况。研究发现：中级I阶段西班牙学生单定语结构使用率和正确率均显著高于双定语结构。该阶段的主要偏误是“的”的误加、遗漏与错位,其次是量词充当定语成分时误代、遗漏与误加,再次是定语的错位。偏误原因主要是母语负迁移。本文针对以上偏误特点,提出了教学建议。 相似文献
16.
This paper describes a novel design for the carrier mechanism of a pipe-inspection micro robot. Based on this mechanism, a new
micro robot for the pipes with diameter of 20mm has been developed. It can travel through both vertical pipes and curved pipes to make
possible inspection that would be difficult with conventional endoscopes. This mechanism is composed of three units, two novel micro
mechanisms called as a planetary wheel mechanism for robot drive, two micro electromagnetic motors and a flexible coupler. 相似文献
17.
秦娟华 《北京工业职业技术学院学报》2022,21(1):66-69
为切实加强新时期高职院校大学生党史教育的实效性,对现阶段高职院校大学生党史教育存在的问题进行分析,指出高职院校大学生党史教育中存在重视不够、教育形式单一、教学内容枯燥等不足,提出通过提高对高职大学生党史教育的重视程度,丰富教学形式和挖掘教学内容,从而切实增强党史教育资政育人功能。 相似文献
18.
利用速度图解法绘制3个等速点的线速度矢量,以直观了解机构中各元件的转动状态,并总结了利用速度图解法分析辛普森式行星齿轮机构的原则;利用相似三角形原理计算各传动方案的传动比,通过对速度图解法与解析法传动比的比较分析,验证了该方法和过程的正确性. 相似文献
19.
唐泉 《咸阳师范学院学报》2011,26(6):68-73
五星动态表是中国古代天文学家计算行星位置所必需的基本表格,其精密与否取决于天文学家对行星在一个会合周期中视运动规律的掌握程度。至迟从战国开始,天文学家通过对行星视运动的长期观测,逐渐掌握了行星的顺逆、迟疾和留等规律,并对造成这些现象的原因进行了深入的思考。梳理了西方近代天文学传入中国之前,中国古代天文学家对行星视运动规律的认识进程,这有助于我们审视行星运动理论的历史。 相似文献
20.
基础教育的单行线使得学生在人格形成过程中不够完善,进入高校后暴露出来的种种现象,让我们感到必须重视这一现实,因此,探究大学生人格完善的途径成为我们高校管理者与教师的新课题。笔者认为大学生正处在人生成长的最关键阶段,完善他们的人格是高等学校教育的宗旨和目的。 相似文献