基于Gearbox5.0的减速机参数化设计

Gearbox齿轮减速器设计系统是一款齿轮减速器设计及齿轮参数计算系统,Gearbox5.0是基于Windows2000开发的适用于圆柱齿轮减速器、圆锥齿轮减速器和蜗杆蜗轮减速器设计以及齿轮传动机构设计的辅助设计系统。利用Gearbox5.0参数化设计可使设计人员从大量繁琐的设计、计算、绘图工作中解脱出来,提高设计效率,保证产品质量。     

基于VBA的V带传动CAD系统开发

以AumCAD为二次开发平台,利用内嵌于AutoCAD的VBA语言进行编程,开发了V带传动的CAD系统,该系统用户界面友好,实现了v带传动的设计和绘图一体化,显著提高了设计与绘图的质量和效率。     

齿轮传动在目标模拟器中的应用

本文主要分析了齿轮传动的一些基本特点,阐述了某型红外目标模拟器中齿轮传动的具体应用,分析了光学结构中齿轮传动在设计过程中应当注意的问题,重点介绍了谐波齿轮传动的优点,提出了为光学结构齿轮传动设计新的方法和途径。     

基于Visual Basic的齿轮传动设计软件编程与开发

本文介绍了齿轮传动功能和使用场合,介绍了齿轮设计开发的过程,介绍了Visual Basic软件设计开发过程,跨学科地完成了软件开发和齿轮设计结合的工作,设计开发出了一套可以用于工程师现场使用的齿轮传动设计计算软件。     

直升机主减速器齿轮及分扭并车构型研究

本文对齿轮传动机构、直升机分扭并车构型发展进行了综述,归纳总结了齿轮传动及分扭并车构型发展历史、分析手段,介绍了直升机主减速器分扭并车构型,为齿轮传动及直升机主减速器设计提供参考。     

巧用Pro/E构建锥齿轮

渐开线齿轮传动在机械传动中应用最广。本文以Pro/engineer5.0为设计软件介绍了渐开线直齿圆锥齿轮的建模方法。整个设计过程将参数化设计和理论方法相结合,大大缩短了设计步骤,提高了零件的准确性。     

渐开线圆柱斜齿轮传动过程啮合设计概述

渐开线圆柱斜齿轮早机械传动中应用极为广泛,本文在对渐开线圆柱斜齿轮传动分析的基础上,对啮合传动过程进行了分析设计,给出了斜齿轮端面齿廓方程,为进一步的渐开线圆柱斜齿轮啮合设计奠定一定的分析基础。     

基于UG的齿轮参数化设计

齿轮传动是机械传动中最基本的传动方式。为了满足CAD/CAE/CAM的需要,实现齿轮三维参数化建模为后续工作奠定基础,具有非常重要的现实意义。参数化模型,大大减少了设计人员的繁重工作,提高了设计效率,缩短了设计周期,为计算机辅助分析、辅助制造提供可能。     

一种山楂去核机的设计

对山楂去核机的方案进行了设计,其主要分为主传动和副传动。主传动主要有槽轮机构,通过槽轮机构带动工作台作间歇转动,副传动用于带动冲头上下运动,其主要组成为一对螺旋齿轮、凸轮和摆动推杆。文章对传动的基本参数和主传动中的槽轮机构进行了设计,其结果可以满足基本要求。     

基于UG NX的齿轮机构运动分析

正以渐开线圆柱直齿轮为例,介绍利用UG NX的GC工具箱得到渐开线圆柱直齿轮,再利用装配、运动仿真等命令,从而得到准确的渐开线圆柱直齿轮机构造型的设计及运动分析。齿轮机构是现代机械中应用最广泛的一种传动机构,它既可以用来传递空间中任意两轴之间的相互运动还可以用来传输动力。另外齿轮与其它传动机构相比,还具有结构紧凑、     

Optimal control of gear shift operations in automatic transmissions

An optimal control approach for gear shift operations in automatic transmissions is proposed in this paper. Starting from a verified model of a typical power train with an automatic transmission a performance measure for evaluating the gear shift process in terms of passengers comfort and control expenditure is developed. The gear shift operation is stated as a multistage decision process by making use of the dynamic programming method. Thereby, the synchronization of the gear box is formulated as a constraint at the end of the process. A control law is derived analytically in an explicit form by minimizing the performance measure over each process stage. Simulation results show a significant improvement in terms of gear shift comfort by different driving load cases. Furthermore, the shift time and the frictional losses in the shift elements can be reduced by applying the proposed control.     

Energy management strategy for parallel hybrid electric vehicles based on approximate dynamic programming and velocity forecast

In parallel hybrid electric vehicles (HEVs), the power split between the engine and the electric motor as well as the gear shift in the gearbox determines the overall energy efficiency. In this paper an adaptive energy management strategy with velocity forecast is proposed to optimize the fuel consumption in parallel HEVs, which is formulated into a mixed-integer optimization problem. Approximate dynamic programming with a novel actor-gear-critic design is presented for simultaneously controlling the power split and gear shift online. The power split as a continuous variable is determined from an actor network to realize the energy distribution between two power sources. The gear shift as a discrete variable is obtained from a gear network to adjust the gear ratio in the gearbox. The concept enables an online learning of the energy management strategy for different driving behaviors without the requirement of a system model and the driving cycle. Simulation results indicate that the proposed strategy achieves close fuel economy compared with the optimal solutions resulting from dynamic programming. Furthermore, a multi-stage neural network is introduced for velocity forecast, providing a computationally efficient training framework with good prediction performance. The velocity prediction is finally combined with the energy management strategy for an effective application and fuel economy.     

Corresponding drivability control and energy control strategy in uninterrupted multi-speed mining trucks

An hybrid uninterrupted multi-speed transmission (HUMST), based on the integration of a planetary gear set and a 3-speed automatic manual transmission (3-AMT), is developed to satisfy the specific performance indexes of mining trucks. The power-split device can alleviate and eliminate the inherent torque interruption of the 3-AMT during gear shift by implementing the designed cooperative shift control strategy which is optimized by quadratic performance index. In order to achieve fast torque coordination while guaranteeing the driving comfort performance, the torque profiles of the power split device and the traction motor are optimized by Linear-quadratic regulator (LQR) algorithm. Dynamic programming (DP) is implemented as a benchmark to demonstrate the maximum fuel efficiency of the proposed HUMST. Because of the high computational cost of optimal control strategies such as DP, an improved real-time control strategy (IRTCS) using modified Gaussian distribution function is proposed to significantly reduce the computing load. As efficiency-oriented energy control strategy would result in frequent gear shifts, to achieve a desirable tradeoff between the overall efficiency and the shift stability, multi-objective genetic algorithm (MGA) is integrated to optimize the overall performance. The detail mathematical and dynamic model shows that the proposed shifting strategy with LQR can effectively suppress shift jerk, and the proposed IRTCS with MGA can reduce shift frequency by 70.78% to improve the drivability, only sacrificing 4.86% of overall efficiency compared to that of DP.     

掘进机履带行走减速器的优化设计

行走减速器是掘进机履带的重要传动部件,传统的设计方法会造成较大的设计余量,使减速箱的体积偏大。为了解决问题采用三级NGW行星齿轮传动,并基于PROE三维软件对其结构特点与实体效果进行优化仿真。     

DF6S900一二档滑块式双锥同步器的设计探讨

本文介绍了变速箱滑块式同步器的功用,讲述了变速箱滑块式单锥同步器在三档减二档时表现的不足,阐述了变速箱滑块式双锥同步器设计的主要依据以及变速箱滑块式同步器设计的注意事项。此外,对其单锥和双锥同步器的性能和寿命也进行了相关试验,对变速箱滑块式单锥同步器在性能试验台架上表现的不足进行具体分析,从台架和道路两方面对它们进行了相关的对比效果测试,对变速箱滑块式双锥同步器的使用也进行了介绍。     

基于Mastercam的车削中心数控加工

结合齿轮轴数控加工实例,对其进行工艺分析的基础上,提出了利用Mastercam软件在车削中心自动编程的思路,阐述了该软件的基本车削功能及车削中心C轴刀具路径功能,详细介绍了其工作的整套流程和实现方法,运用该软件,省却了手工编程的繁琐,提高编程和加工效率,实现高效优质的数控加工。     

某微型车变速器齿轮断齿失效分析

针对某微型车在道路试验中出现的变速器三档齿轮断裂的问题,通过对断裂齿轮的断口观察及化学成分、硬度、金相组织的检验及扫描电镜分析(SEM),结果表明,三档齿轮断裂为疲劳断裂,疲劳源位于齿根处,此处表面残留着较深切削刀痕,由多次重复的弯曲应力和应力集中造成疲劳断裂。针对齿轮失效原因,采用改进热处理工艺时间及渗碳层深度等措施,避免了齿轮断裂现象的发生。     

双离合式自动变速器换挡控制方法的研究

双离合式自动变速器换挡能够实现平稳快速的动力性换挡,提高乘坐的舒适性。由双离合器式自动变速器换挡过程的分析可知,当上一档位的离合器分离,下一档位的离合器滑摩的时候,由于两个档位变速比的差别,为了使换挡过程中车速平稳变化,没有明显的冲击,必须在这过程中,对发动机转速进行有效控制以匹配下一档位的输入轴转速。本文研究双离合式自动变速器换挡控制方法,编写相应的换挡控制程序,对发动机和离合器同时进行有效的控制。实验结果表明,本文采用的控制方法实现了汽车平稳变速。     

Control rules extraction and parameters optimization of energy management for bus series-parallel AMT hybrid powertrain

A rule-based energy management strategy, that the control rules are extracted from acknowledged optimal algorithms and its control parameters are optimized offline and corrected online, for a series-parallel hybrid powertrain with an automatic mechanical transmission (AMT) is proposed in this paper to achieve near optimal fuel economy and battery state-of-charge (SOC) balance. Firstly, the dynamic programming (DP) global optimization method is applied to extract driving-mode transition rules and gear shifting rules. Furthermore, an instantaneous equivalent fuel consumption minimizing optimization method (ECMS) is utilized to determinate the engine torque distribution rules during its parallel driving mode. Then selected control parameters of driving-mode switching rules and torque split distribution are optimized based on genetic algorithm (GA) for further fuel consumption improvement. And the adaptive correction of optimized control parameters based on online driving cycle recognition method is discussed also. The simulation results show that this real-time rule-based energy management control strategy associated with the series of optimization approaches comprehensively can achieve a relatively close fuel consumption results to global optimal results and sustain the battery SOC balance after the end of driving cycle without much cycle-depending care.     

论现场斜齿圆柱齿轮螺旋角的测绘方法

斜齿圆柱齿轮机构正确啮合的条件之一是两齿轮互相啮合轮齿的倾斜方向一致。在实际工作中,经常会遇到更换一件或两件齿轮情况,需要对其进行测绘。在测绘时,应准确确定斜齿圆柱齿轮的分度圆柱螺旋角,应尽量减小测绘误差,保证斜齿圆柱齿轮的传动质量和强度不发生太大的变化。为此,在现场总结以下几种便捷的测绘方法,仅供参考。