微车变速箱齿轮有限元应力分析

本文利用Ｉ－ＤＥＡＳ软件对微车变速箱齿轮进行了有限元应力分析。建立了具有精确齿廓形状的。齿变位斜齿轮有限元分析模型，求解出齿轮模型的弯曲应力和接触应力分布。为变速箱齿轮的传动性能及失效分析提供了依据。     

渐开线斜齿轮的接触分析

建立斜齿轮接触的有限元模型,基于非线性接触算法对斜齿轮进行有限元分析,得到斜齿轮的齿根弯曲应力和啮合齿面的接触应力结果,在此基础上,将仿真与传统理论计算结果进行比较,结果表明,利用有限元法分析齿轮接触问题是可行的.     

柴油机斜齿轮接触应力分析及改善研究

针对柴油机传动齿轮结构特点,以某曲轴斜齿轮副为研究对象,运用三维接触有限元方法,计算分析了齿轮齿向接触应力分布及结构参数对其的影响,与常规理论方法计算结果吻合,说明有限元计算齿轮啮合接触应力结果合理、可信。研究表明该齿轮接触应力分布不均是由大的轴向弯曲变形导致两齿轮沿齿向的传动间隙不等引起,并运用螺旋角修形使齿向接触应力分布大为改善,为齿轮设计提供参考依据。     

非正交修形斜齿面齿轮传动接触应力计算研究

非正交修形斜齿面齿轮是一种具有普适性的交叉轴齿轮传动方式,目前还没有接触应力解析计算公式,只能依靠有限元软件进行接触应力计算。给出了其接触应力计算方法和相应的计算公式。首先,基于曲面啮合传动原理,推导了非正交修形斜齿面齿轮齿面方程;其次,建立含安装误差的接触分析坐标系,由齿面接触分析原理得到接触点及其曲率计算方程;最后,按赫兹接触理论推导出一般形式的接触应力解析计算公式,该接触应力计算公式可以计算正交与非正交、修形与非修形、直齿与斜齿等各种不同形式的面齿轮传动接触应力,通过编制程序快速计算出相应的接触应力。以某一设计参数的面齿轮副为例,应用提出的接触应力计算方法计算出接触应力,同时利用Abaqus有限元软件进行齿面接触应力计算,提取有限元计算的面齿轮齿面接触应力值,与解析计算公式的结果进行对比,两者误差为5. 23%左右。对比结果表明,给出的非正交修形斜齿面齿轮齿面接触应力计算方法与计算公式正确可行。     

基于ANSYS的斜齿轮接触有限元分析

通过接触问题有限元基本理论的研究,应用大型有限元分析软件ANSYS建立多齿对啮合斜齿轮接触有限元模型,对其进行接触非线性有限元分析。计算结果准确直观,为斜齿轮接触应力分析和强度校核提供了更加快速有效的方法。     

基于有限元法的新型汽车门锁中塑料斜齿轮强度仿真分析

为研究某新型汽车门锁中的塑料斜齿轮在工作条件下的轮齿受力情况,运用Abaqus建立了斜齿轮啮合的有限元模型,基于非线性接触算法对塑料斜齿轮的接触过程进行了仿真分析,并得到塑料斜齿轮的接触应力与弯曲应力。运用刘易斯方程及齿轮赫兹应力理论对塑料斜齿轮啮合过程中的许用应力进行了理论计算,并与有限元仿真结果进行对比;结果验证了塑料齿轮的强度满足实际工作的要求,并指出齿轮正常啮合过程中最大接触应力出现在齿轮双齿啮合区间,而最大弯曲应力发生在两齿啮合即将进入三齿啮合位置,此时齿轮容易发生疲劳破坏,提出了提高齿轮轮齿强度的改进方案。研究为塑料齿轮的强度分析提供了理论依据。     

基于ANSYS的汽车变速器斜齿轮的有限元分析

利用Creo2.0软件对汽车变速器斜齿轮进行三维建模,导入到ANSYS软件中进行有限元分析。通过施加载荷和约束,得到了齿轮的弯曲应力和齿面接触应力。将有限元分析应力值与理论应力值进行了对比,验证了有限元分析结果的正确性。     

基于参数化的斜齿轮副接触应力分析

以提高齿轮建模和分析效率为目标,基于APDL语言对有限元软件ANSYS进行二次开发,建立了一对斜齿轮副参数化建模程序,对该齿轮副进行接触应力分析,获得了齿面接触应力和齿根弯曲应力分布规律,通过与传统CAD/CAE齿轮分析方法对比,验证了该方法在齿轮建模和有限元分析中具有相同精度的同时,能够提高分析效率.     

斜齿轮传动啮合过程齿面接触应力有限元分析

首先运用PRO/E软件完成了斜齿轮传动的三维造型,然后在ADAMS中实现了斜齿轮传动的动力学仿真,得到了斜齿轮传动的啮合力、转矩等参数特性曲线。之后,将PRO/E中建立的斜齿轮传动模型导入到ANSYS中,将ADAMS系统仿真得到的最大载荷作为边界条件,对斜齿轮进行了齿面接触应力的有限元分析。将有限元仿真结果与赫兹公式计算值相比较,误差较小,验证了本文所论述的计算方法是可行的。     

内啮合斜齿轮高精度三维有限元自动建模方法

为提高内啮合斜齿轮有限元接触分析的建模速度和模型精度,提出了一种齿轮高精度三维有限元模型的自动建模方法。基于齿轮插刀齿廓方程,利用齿廓法线法,得到包括齿根过渡曲线的内、外斜齿轮端面齿廓,建立了内、外齿轮参数化粗网格有限元模型。开发了表层六面体网格剖分方法,自动识别齿面接触带单元,进行分级剖分细化,保证了有限元模型的建模精度和网格密度。进行了齿面接触分析,得到了内啮合斜齿轮的弯曲应力、接触应力、接触印痕、传动误差、时变啮合刚度和载荷分配率。粗细网格有限元模型计算结果对比分析表明,该方法提高了内啮合斜齿轮有限元建模效率和计算精度,缩短了计算时间,为快速准确的齿轮接触分析奠定了基础。     

基于Pro/E和ABAQUS的直齿轮强度分析

选取一对外啮合渐开线直齿圆柱齿轮,用 AGMA 标准对齿轮的接触强度及弯曲强度进行计算;在 Pro/ E 软件中精确建立该啮合齿轮的三维模型,将模型文件导入 Abaqus 软件,对齿轮啮合进行有限元强度分析,最后将两者的分析结果进行对比。结果表明,利用有限元方法分析齿轮的强度是可行的。     

Effects of flank deviation on load distributions for helical gear

Flank deviation is one of the important factors that greatly affect helical gear strength. A qualitative analysis is performed using finite element method (FEM) for the effects of flank deviation on load distributions for helical gear based on ANSI/AGMA ISO 1328-1 (standard for cylindrical gears — ISO System of Accuracy — Part 1: Definitions and Allowable Values of Deviations Relevant to Corresponding Flanks of Gear Teeth). To analyze the effects of flank deviation, tooth contact analysis (TCA) is developed and load distributions of helical gears with flank deviation are presented. Load distributions in contact lines are derived and compared to each other under grade 5 and 7 after taking five types of flank deviation, including single pitch deviation, profile form deviation, profile slope deviation and helix form deviation as well as helix slope deviation, into account. It is found that the effects of individual flank deviation on load distribution have the superposition property. Flank crowning and tip relief corrections must be carefully regarded in the design process because of the effects of flank deviation on load distributions.     

基于MATLAB与SolidWorks联合建模的渐开线圆柱直齿轮接触特性仿真分析

通过渐开线直齿轮齿廓方程在MATLAB中构建出渐开线直齿轮的点云模型生成精确地齿廓,将点云数据导入到SolidWorks中构建出齿廓精确的渐开线直齿轮副的三维模型;然后对渐开线直齿轮副进行理论接触应力计算,并对联合建模的齿轮副与参数化建模的齿轮副进行接触应力的有限元仿真分析和动力学仿真分析结果进行对比.结果表明:联合建...     

Experimental measurement of strain and stress state at the contacting helical gear pairs

Contact stress evaluation in gears has been a complex area of research, due to its non-linear and non-uniform nature of stress distribution. The high contact stress on gears results in pitting and scuffing, which leads to tooth failure. Furthermore the effects of friction on gear contacts make the problem more complicated. Hence, in this paper, attempt has been made to study contact stress in gears. The experimental testing and analysis of the helical gear was carried out using Gear Dynamic Stress Test Rig (GDSTR). GDSTR is a newly designed test rig to compute the contact stresses on the gear pair contact, under real gear conditions. GDSTR uses the strain gauge and carbon slip rings to measure the surface contact stresses at the contacting points of a meshed gears. The experimental analysis showed promising results which have been verified by the finite element frictional contact analysis. The experimental testing was carried out on 5° and 25° helical gear pairs. Helical gear models with the same specifications and for different frictional coefficient conditions were also generated using FE modelling. The frictional contact stress analysis using FEM has been used for comparison with the experimental results.     

Parametric modeling and contact analysis of helical gears with modifications

An approach for a mathematical model and contact analysis of helical gears including tip relief, root relief, end relief and longitudinal crowning modification was developed. First, tooth profile equations of non-modified involutes, tip reliefs, root reliefs and fillets were derived after applying gear principles and coordinate transformation to transverse cross section profiles of a rack cutter. Then the intersecting lines between different profiles were solved through by Gauss-Newton numerical method. Parametric modeling program of modified helical gears was obtained to automatically generate exact gear surfaces of tip reliefs, root reliefs, end reliefs and longitudinal crowning modifications via Matlab code. Subsequently, an example of helical gear pair in practical engineering was presented, and the solid model and finite element model with modification were established. Finally, the dynamic contact characteristic of helical gear pair was calculated by three-dimensional dynamic contact finite element method. It is expected that the proposed approach can be applied in analyzing the effect of modification on radiation noise prediction of gear system in further study.     

三维螺旋齿廓曲面接触强度计算模型

从三维螺旋齿廓曲面的形成得到接触强度计算模型。介绍改进的有限元齿廓曲面接触强度计算法,包括改进的计算方法、确定产生最大接触应力时啮合位置的方法等。提出计入齿面接触载荷非线性及啮合齿对数发生变化时的斜齿轮三维强度有限元建模方法及程序,给出应用实例。该方法使齿面接触强度计算更接近工况。此方法还可应用于圆柱螺旋齿轮、锥齿轮、蜗轮蜗杆等传动接触强度的计算。     

基于精确模型的斜齿轮接触应力有限元分析

在 Pro/ E中通过实例阐述了斜齿轮的精确建模方法 ,并介绍了具体的设计原理 ,将生成的一对齿轮进行标准安装生成啮合模型。通过 Pro/ E与 ANSYS的数据交换接口 ,把啮合模型的几何数据导入 ANSYS中 ,并转化成由节点及元素组成的有限元模型 ,运用完全牛顿 -拉普森方法进行接触应力的静力学求解 ,并介绍了算法原理。本文充分展示了 CAD与 CAE的结合应用     

Modeling of helical gear contact with tooth deflection

The majority of gear tribological studies are made on spur gears. However, helical gears are generally used in industry, and their contact behavior deserves more attention to establish a realistic base for detailed friction, wear and life studies. This study focuses on the modeling of helical gear contact with tooth deflection. A calculation model for helical gear contact analysis is introduced. Helical gear surface profiles are constructed from gear tool geometry by simulating the hobbing process. The model uses three-dimensional finite elements for the calculation of tooth deflection including tooth bending, shearing and tooth foundation flexibility. The model combines contact analysis with structural analysis to avoid large meshes. Tooth foundation flexibility was found to have an essential role in contact load sharing between the meshing teeth, whereas contact flexibility plays only a minor role. The capability of different local contact calculation methods was also studied.     

混合标架下宽斜齿轮三维接触有限元前处理技术

本文针对宽斜齿轮，采用混合标架，建立了轮齿在各个不同位置的啮合时的有限元网格自动生成的算法；并开发了模块化；结构化，参数化的前处理程序，只需输入齿轮基本参数，即可得到完整的轮齿三维接触有限元分析数据文件，本文程序使用方便，适于在工程设计推广使用。