Considering effects of major factors on root section stresses , 2d and 3d dynamic finite element models are accurately established and then the history of both the stresses - loads at the test - points and the deflection - loads at the loading points are evaluated 综合分析影响齿根应力的重要因素的基础上，创建了精确的二维和三维动态有限元模型，计算出齿根危险截面测点的应力历程和受载点的变形历程。
After synthetically studying the effects of loading positions , rim thickness , circular pinion numbers and fillet radii of gear hob on root section stresses , a judging formula of plane stress and plane strain is proposed and verified , then 2d and 3d fem models are accurately established 系统探讨了加载位置、轮缘厚度、周向齿数的确定方法，分析了滚刀顶部圆角对齿根应力的影响，提出了两类平面问题的判据并予以验证。
It is not like expert system , which needs repeat three periods - conceptualization , formalization and improvement . in this paper , research the fault gears " three models by the vibration signal . pick up the character vector by using the wavelet packet and energy method as the ann input neural vector 本文以齿轮箱为研究对象，在齿轮正常、齿根裂纹、齿面非正常点蚀三种模式下，对振动信号加以分析，运用“小波包?能量”法提取出信号特征量，作为神经网络的输入向量，采用包括有输入层、单隐层和输出层的bp网络。
4 、 on the basis of analyse of a quasi - static meshing simulation in a meshing period , a dynamic meshing simulation in the case of definite torque and rotary speed are carried out in a meshing period . the numerical results which indicating the variety of the contact status , the contact stress , the bending stress in the location of teeth root and the torque and rotary speed of gear pair vs the different meshing position are presented 4 、在对螺旋锥齿轮准静态啮合进行仿真分析的基础上,进行了螺旋锥齿轮动态瞬态啮合仿真分析,重点分析带载启动时出现的冲击现象,得出了齿轮的接触状态、接触应力、齿根弯曲应力及主从动齿轮的扭矩、转速和加速度随啮合位置变化的规律。
After thoroughly analyzing the influence of each pump parameters on the gear pump performance , the paper developes the criterion for optimum gear parameters , which can be utilizied in practice easily for gear manufacturing using normal involute gear hob with two - fillet type . the conclutions studied by the paper are : 1 . both the addendum coefficient and the deddendum coefficient of the pump gear should be 1 . 125 以目前国内普遍使用的双圆弧头全齿高为2 . 5倍模数渐开线标准滚刀作为泵齿轮的加工刀具，通过对齿轮加工原理的分析，提出了欲使泵齿轮参数达到最佳，泵齿轮的齿顶高系数和齿根高系数都为1 . 125 ；对变位系数的确定应考虑到泵齿轮的根切、齿顶厚、重合度以及侧隙因素；泵齿轮为避免过渡曲线干涉，必然要存在根切现象。
Gear form is precisely , plotted by portray point . for friendly user interface , the dialog - box is given , using dcl language to compile dialog box program . because the given program can not only output all the optimum basic parameters of pump gear , but also simulate the meshing process of a pair of pump gears , gear pump can be designed and manufactured economically 精确绘出泵齿轮的轮齿几何形状，尤其精确绘制出了标准齿轮滚刀切出的齿根过渡曲线，演示了国标双圆弧头标准滚刀加工泵齿轮的过程，并实现了泵齿轮副的啮合仿真，这些对检查轮齿干涉以及确定齿轮泵的卸荷槽位置和形状提供了依据。
3 、 based on the model , a quasi - static meshing simulation is carried out in a meshing period . the numerical results which indicating the variety of the contact status , the contact stress , the bending stress in the location of teeth root and the torque and rotary speed of gear pair vs . the different meshing position are presented , and the rationality of the model is be verified 3 、基于所建有限元分析模型,在一个啮合周期内,对齿轮副进行准静态啮合仿真分析,给出了准静态啮合时齿轮的接触状态、接触应力、齿根弯曲应力及主从动齿轮的扭矩和转速随啮合位置变化的规律,验证了所建模型的正确性。
Abstract : the therortical calculation of the bending stress of the root and experimental stress analysis on the modified profile and the standard involute tooth profile were made with the finite element method and the electric resistance strain film method . this indicated that the modified profile was supe rior to the standard involute profiles in terms of the bending strength 文摘:分别用有限元和电阻应变片法对修形齿形和渐开线齿形进行齿根弯曲应力计算与实验应力分析.结果证明在弯曲强度方面修形齿形比标准渐开线齿形更优越
After being improved , the gear surface contact fatigue strength obeys weibull distribution and stress obeys normal distribution , the gear bottom bend fatigue strength and stress obey logarithm normal distribution , according to the relation of average safe rate and reliability , then the gear strength reliability design and check equations can be deduced 将齿面接触疲劳强度按威布尔分布、应力按正态分布处理，将齿根弯曲疲劳强度和应力均按对数正态分布处理，再根据平均安全系数和可靠度之间的关系，推导出了齿轮强度可靠性设计和校核公式。
It is shown from results that increasing carburizing time further in the normal technology can not obviously deep the carburizing layer , but can cause nonmartensite microstructure at the bottom of the gear and coarse grain across the gear , these will heavily decrease the fatigue life of the gear 结果表明：在正常渗碳淬火工艺基础上再延长渗碳淬火1小时，齿轮渗碳层深度变化不大，但其齿根局部表面处有非马组织，且晶粒尺寸易产生异常长大现象，从而致使台架疲劳寿命明显下降。
