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一、引言 渐开线齿轮的范成法加工长期以来一直是机械设计课程教学中的重点和难点。为加深学生对这部分概念的理解,在教学中特意安排了2至3个小时的实验,但由于受实验仪器——齿轮范成仪和实验时间的限制,只能作出模数为20、压力角为20°、齿数为10的标准齿轮和变位齿轮的二至三个齿形(其中只有一个齿形是完整的),并且还无法图示说明模数、压力角、齿数变化时齿轮几何尺寸、齿形、基圆半径与齿根圆半径的相对位置的变化情况。利用计算机的特长进行齿轮范成法的教学,可较好地解决以上的问题,并且在齿轮参数的选择上也没有限制。 相似文献
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曾孟彬 《CAD/CAM与制造业信息化》2013,(12):61-63
过盈配合是齿轮组合设计中一种重要的连接方式。为研究齿轮过盈装配后的强度,本文以渐开线圆柱齿轮为例,基于ADINA有限元软件。对其过盈配合过程进行了仿真。对齿轮的等效应力、接触应力进行了分析。并研究了过盈量对装配后齿轮强度的影响规律。 相似文献
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传统方法在进行齿轮角度偏差校对时,未构建齿轮三维重建模型,存在高精密齿轮角度校对准确率较低、校对时间过长问题。提出高精密齿轮角度偏差的智能视觉校对仿真方法,有效解决以上问题。通过白光干涉仪提取高精密齿轮实际齿面轮廓角度偏差特征信号,获取齿轮实际齿面轮廓角度偏差信号数据,其中角度偏差信号数据包括波高偏差数据与波距偏差数据。利用CATIA软件构建含有角度偏差的高精密齿轮模型。对高精密齿轮实施系统标定,获取校正角度偏差后高精密齿轮的投影仪坐标与相机坐标,实现齿轮角度模型三维重建,从而实现高精密齿轮角度偏差的智能视觉校对。为验证设计方法的齿轮角度偏差校对效果,设计对比实验。实验结果表明,智能视觉校对方法的校对准确率较低高于原有方法,且齿轮角度偏差的校对时间明显降低。对于高精密齿轮质量的提升有很大意义。 相似文献
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针对目前螺旋锥齿轮切削仿真系统独立性差、仿真速度慢、精度低、很难实现实时仿真等问题, 提出了刀具和轮坯进行布尔运算的一种新方法,即将螺旋锥齿轮加工区域层片分割后与刀具切削面求交的方法,在此基础上研究了切削过程的可视化及其实现,并基于虚拟现实技术开发出了螺旋锥齿轮数控加工仿真系统,介绍了该仿真系统的整体结构、各个模块的作用以及实现的流程。仿真实例验证了核心算法和仿真系统的正确性和有效性。 相似文献
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In many applications in mechanical engineering, gear wheels are used to transmit power between rotating shafts and, therefore, the ability to incorporate them into multibody systems and to simulate contact between them has become an essential topic in multibody dynamics.However, in some applications gear wheels may not be considered as being perfectly rigid. Due to the effect of contact forces there occur relevant deformations in meshing teeth and it is required for a high quality of the analysis to introduce some elasticities in the model of meshing gear wheels. Therefore, in this work elastic elements between the teeth and the body of each gear wheel are considered. This approach is especially well suited for multibody systems since it is a compromise between a totally rigid model and a fully elastic model allowing the simulation of large motions with many revolutions while still important elasticities are considered. The teeth and the body of each gear wheel are still modelled as being rigid but they are connected to each other by elastic elements. In doing so, an efficient and physically motivated algorithm is described and implemented in order to find the effects of multi-tooth contact as well as backlash and left and right hand side contact of the meshing teeth. Some examples compare the simulation results of rigid, partially elastic and fully elastic models. 相似文献
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针对当前基于MATLAB/SIMULINK的半物理仿真(Hardware in Loop Simulation,HILS)系统中不支持多领域建模、联合仿真模型转换过程复杂且存在误差等问题,提出基于Modelica和建模仿真软件MWorks进行HILS的方法,分析其所涉及的建模方法、实时仿真接口和代码生成等关键技术,并以此为基础构建支持Modelica模型的HILS.以前起落架转向系统和起落架收放系统为应用实例,建立HILS平台,对该方法进行验证.仿真结果表明该方法可行,结果可信度高. 相似文献
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Sliding simulation for adhesion problems in micro gear trains based on an atomistic simplified model
The objective of this research work is to provide a systematic method to perform molecular dynamics simulation or evaluation for adhesion of micro/nano gear train during sliding friction in MEMS. In this paper, molecular dynamics simulations of adhesion problems in micro gear train are proposed. The perfect MEMS gear train model is very complicated by considering the computing time. A simplified model to simulate surface sliding between metals by molecular dynamics (MD) is proposed because the surface property is a dominant factor for the performance of gear systems. Based on analysis of sliding friction and the transmitting characteristics of micro gear train, a model is established by utilizing the Morse potential function. The Verlet algorithm is employed to solve atom trajectories. The simulation results show that adhesion tends to occur between two micro gears after certain cycles and such adhesion accounts for the friction force and the temperature increase. The simulation results are in consistence with the experimental results in the literature. The model is meaningful to prolong the lifetime of micro gear train by selecting proper parameters. 相似文献
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基于LMS Virtual.Lab的起落架动态性能仿真分析 总被引:1,自引:0,他引:1
针对飞机起落架设计和性能分析过程中,传统方法计算过程复杂、计算精度不高、研制周期长,且采用实验研究成本高、局限性大的问题,利用CATIA和LMS Virtual. Lab对某支柱式起落架进行收放运动学和动力学以及落震仿真分析.运用机构运动学正解方法进行主起落架收放运动学仿真分析;在运动学仿真模型中添加质量力、气动阻力、惯性力和摩擦力等参数进行动力学仿真;在不改变起落架机构原理的前提下简化主起落架结构并进行落震仿真分析.落震仿真结果与理论计算结果误差在5%以内,说明仿真结果与理论计算结果一致性较好.利用CATIA和LMS Virtual. Lab可以实现起落架设计与分析一体化,且实现过程简单、可视化强、准确度高. 相似文献
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将偏心齿轮-非圆齿轮行星系应用于插秧机分插机构中,研制出混合齿轮行星系分
插机构。建立偏心齿轮与非圆齿轮的节曲线数学模型,获取齿轮节曲线方程,并结合KISSSOFT
和MATLAB 软件对非圆齿轮进行设计。建立分插机构运动数学模型,利用MATLAB 开发优化
辅助软件,对分插机构的参数进行优化。完成了分插机构的三维CAD 设计,并在ADAMS 中
对分插机构进行了运动学虚拟仿真,获取了秧针尖点的静态轨迹和动态轨迹,将其与理论分析
得到的轨迹曲线进行对比,验证了混合齿轮行星系应用于插秧机分插机构上的可行性。 相似文献