ZY-1型硬齿面双圆弧齿轮齿根应力的分析

介绍了紫瑞CAE2.0软件有限元分析模型的前处理。在此基础上，对不同法向模数、螺旋角和齿数的双圆弧齿轮，利用有限单元法计算出轮齿的齿根应力，研究上述各个因素对ZY—1型硬齿面双圆弧齿轮弯曲强度的影响，得出一些结论。     

凸、凹齿同时加载双圆弧齿轮齿根应力分析

根据任意转角位置的双圆弧齿轮齿廓数学模型,运用Pro/E软件构建了双圆弧齿轮精确模型,首先分析比较了仅在凸齿处加载和在凸、凹齿处同时加载两种不同加载方式的区别,然后对一系列不同参数的双圆弧齿轮在轮齿的凸、凹齿处同时加载,进行了有限元分析,得出了双圆弧齿轮齿根弯曲应力与螺旋角、模数、齿数的关系曲线。其分析结果将为双圆弧齿轮设计和制造等提供参考依据。     

纯滚动单圆弧齿轮多目标模糊优化设计

文章综合利用模糊评判方法和多目标优化设计方法,以相对主曲率半径最大、重合度最大和齿轮传动总体积最小为优化目标,建立了纯滚动单圆弧齿轮传动机构的多目标模糊优化模型,并对其进行单目标分析和多目标优化设计。设计分析得出：法向模数对纯滚动单圆弧齿轮的相对主曲率半径影响权重最大,其次是齿数、齿廓系数、螺旋角、齿宽系数。其中齿数、齿宽系数、螺旋角对纵向重合度影响大,并且随之增加而减小;法向模数、齿数、齿宽系数则对齿轮体积和影响大,并且随之增加而增加。影响程度从高到低的排序为：法向模数、齿数、齿宽系数、螺旋角、齿廓系数。所得结论为纯滚动单圆弧齿轮的受力改善和轻量化设计提供了理论参考和依据。     

双圆弧齿轮凸、凹齿同时加载的齿腰弯曲应力

根据任意转角位置的双圆弧齿轮齿廓数学模型,运用Pro/E软件构建了双圆弧齿轮模型,首先分析比较了仅在凸齿处加载和在凸、凹齿处同时加载两种不同加载方式时的齿腰弯曲应力,然后在轮齿的凸、凹齿处同时加载,对齿腰处的弯曲应力进行了有限元分析,得出了双圆弧齿轮齿腰弯曲应力与螺旋角、模数、齿数的关系曲线。其分析结果将为双圆弧齿轮设计和制造等提供参考依据。     

双圆弧齿轮啮合点载荷分配研究

不同齿数的双圆弧齿轮啮合传动时,由于齿宽不相同,轮齿在受力时的弯曲变形也不相同,则轮齿每个啮合点处的接触应力不相同。建立双圆弧齿轮啮合点接触力的数学模型,并根据弹性力学和材料力学计算出了轮齿弯曲刚度,通过实例计算获得了不同齿数、模数及重合度时双圆弧齿轮各啮合点处的接触力。研究结果将为双圆弧齿轮齿廓修形及提高齿轮承载能力提供依据。     

圆弧齿线圆柱齿轮的参数计算及选择

圆弧齿线圆柱齿轮是一种新型齿轮,１９８６年在布鲁塞尔第３５届国际新技术贸易展览会上展出。它的特点是：轮齿与其分度圆柱面的交线在分度圆柱面所展开的矩形中为圆弧;而且在齿宽中央截面内为渐开线齿形。本文推导了这种新型齿轮的齿面方程、重合度、压力角、齿宽系数计算公式;给出了其几何尺寸计算公式表;并论证了其特性参数：刀盘半径、齿宽系数、模数及齿数的选择原则。     

双圆弧齿轮传动的模糊可靠性优化设计

以圆弧齿轮传动的小齿轮齿数、法面模数、螺旋角及齿宽的均值为设计变量 ,考虑影响齿轮传动种种因素的随机性、模糊性 ,以两圆弧齿轮的体积和最小为目标函数 ,应用模糊设计理论和可靠性设计理论 ,建立了双圆弧齿轮传动的模糊可靠性优化设计的数学模型 ,并附有应用实例。     

在滚齿机上加工斜齿轮时挂轮的微机辅助选择

该文介绍了一种在滚齿机上加工斜齿轮时利用计算机选择分齿挂轮与差动挂轮齿数的方法，只要将斜齿轮的齿数、法向模数、分度圆螺旋角、滚刀头数输入计算机选择分齿挂轮与差动挂轮齿数的方法，只要将斜齿轮的齿数、法向模数、分度圆螺旋角、滚刀头数输入计算机，立即就能得出分齿挂轮与差动挂轮的齿数，这种选择方法速度快、精度高、使用方便。     

双圆弧齿轮轮齿弯曲应力计算

本文利用三维有限元法,据GB12759—91型双圆弧齿轮轮齿的齿根和齿腰弯曲应力沿齿向分布、螺旋角β大小和接触迹线偏差△J,对双圆弧齿轮齿根和齿腰弯曲应力大小的影响等进行了较全面的计算分析。在此基础上,归纳得出双圆弧齿轮轮齿锐角端螺旋角应力影响系数K_(Fβ)、K_(Yβ)和齿端应力增加系数K_(FE)、K_(YE)以及接触迹线偏移的应力影响系数。     

基于ANSYS的面齿轮轮齿刚度影响因素分析

面齿轮轮齿刚度是面齿轮传动动态分析及优化设计的重要参数,面齿轮设计参数对其轮齿刚度有重要影响。建立了面齿轮传动模型,运用有限元分析软件Ansys Workbench和Ansys Classic对面齿轮不同啮合点处的轮齿刚度进行了联合仿真,研究了面齿轮主要设计参数对其轮齿刚度的影响。结果表明:面齿轮轮齿刚度沿齿根到齿顶方向逐渐减小,随着面齿轮模数、压力角及齿宽的增大而相应增大;面齿轮轮齿刚度沿齿根到齿顶的变化率随着模数的增大而变小,随着齿宽的增大而增大,而压力角对其变化率基本没有影响。     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

Quantum Cooperative Robotics and Autonomy

The intersection of Quantum Technologies and Robotics Autonomy is explored in the present paper.The two areas are brought together in establishing an interdisci...     

On the Relation of Load to Average Gap in the Contact Between Surfaces with Longitudinal Roughness

A computer simulation model for the contact between longitudinally-oriented rough surfaces has been formulated. This model closely duplicates the actual surf ace contact deformation behavior by taking into account the elastic interactions between the asperities. There were no assumptions made about the shapes, or any deformation behavior of the asperities, except for their obeying the laws of elasticity. The plastic deformations on the high asperity peaks were taken into account by setting a ceiling on their contact pressures at the material hardness value. The simulations used real surface profiles which were digitized from unworn circumferentially ground steel surfaces. Each pair of these profiles was mathematically combined to form an equivalent rough profile pressing against an infinitely rigid flat and having the appropriately adjusted elastic modulus. A total of 28 different pairs of profiles were used in the simulations. Each contacting pair was subjected to 30 different load levels and the local contact pressures and deformations were calculated. The contact simulations yielded some important mathematical relationships between parameters, such as the real area of contact, average gap, and average asperity load through statistical curve fitting. Two analytical functions were generated to relate the average load to average gap and the real area of contact to load.     

三绕组变压器的双绕组等效建模及在Matpower中的应用

针对实际电网存在着大量的三绕组变压器,但国际上一些著名商业软件,如BPA仿真软件、Matpower这一权威潮流计算开源软件,均只提供双绕组变压器模型,限制了其在具有三绕组变压器的电力系统中的应用的问题,潮流计算是自主开发的电力系统各种应用软件的核心模块,因此依托国际权威开源程序进行二次开发,是一种较好的选择。对Matpower要求的数据格式进行了归纳,对变压器的一般的等值电路及带理想变压器的等值电路和带标幺值的等值电路进行了分析研究,提出了三绕组变压器转换为双绕组等效模型的建模方法,使得原先只适应双绕组变压器的潮流计算软件可以适用于三绕组变压器电网的潮流计算;最后以Matpower软件为例进行了案例计算,并用PSASP仿真软件进行对比验证。研究结果证明,所提出的建模方法是有效的。     

电站锅炉模糊风险评价方法研究与应用

针对电站锅炉风险等级评价问题,将模糊综合评价技术应用到电站锅炉风险等级评价中。开展了电站锅炉失效影响因素及模糊评价因素的重要程度分析,建立了一套科学合理适于在线评价的电站锅炉风险评价体系,提出了模糊综合评价技术与改进的模糊层次分析法相结合的模糊风险评价方法,利用改进的模糊层次分析法计算了指标体系中各层指标权重。对某一台电站锅炉的实际运行工况影响子因素进行了模糊风险评价,采用模糊合成算子进行模糊综合运算得到电了站锅炉运行工况影响子因素的评价向量。研究结果表明:电站锅炉的运行工况影响子因素的风险评价等级为第6级,失效可能性等级为小,该电站锅炉运行工况良好。     

考虑进油孔有限长滑动轴承油膜力的近似解析解

针对具有进油孔的有限长滑动轴承油膜力求解问题,采用变分原理和分离变量法,求得了有限长滑动轴承油膜压力分布的近似解析表达式。将油膜压力分布的近似解析表达式在油膜存在区域上进行积分,即得到了油膜力。将提出的计算有限长滑动轴承油膜力方法与无限长轴承模型、有限元方法的计算结果进行了比较,发现了提出的方法与有限元方法的计算结果很接近。最后,研究了进油孔位置和进油压力对油膜存在区域、油膜力等的影响,研究结果表明进油孔位置和进油压力对油膜存在区域和油膜力有较大的影响。     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

交通荷载作用下桥梁结构参数识别方法

应用动力节点加载法,将作用在桥梁上的交通荷载转化为等效节点荷载,再用两步构造法识别结构物理参数.第1步,用Newmark-β方法变换结构运动方程,并用结构的加速度响应求得变换空间内的位移、速度和加速度响应;第2步,基于最小二乘原理,构造出变换空间内求解结构参数的递推式,进行结构物理参数识别.数值模拟结果表明,在交通荷载作用下,该方法能够快速、准确地进行桥梁结构参数识别.     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...     

End-to-End Multiview Gesture Recognition for Autonomous Car Parking System

The use of hand gestures can be the most intuitive human-machine interaction medium.The early approaches for hand gesture recognition used device-based methods....