椭圆齿轮滚齿机的工作原理及齿形方程

在椭圆齿轮标准化设计方法的基础上研制的椭圆齿轮滚齿机，由于滚齿时椭圆齿轮作复合运动，使椭圆齿轮上每个齿的齿形都以r1为节圆半径的当量齿轮相同。因而可以用研究圆柱齿轮的方法来研究椭圆齿轮的滚齿方法和齿形方程。与研究椭圆齿轮的传统方法相比，无疑要简便得多。     

高阶椭圆齿轮副的加工仿真及设计缺陷修正方法研究

基于插齿刀与高阶椭圆齿轮的啮合原理,建立了插齿刀包络高阶椭圆齿轮副齿廓的数学模型,开发了模拟插齿刀包络高阶椭圆齿轮副齿廓的动态仿真程序。依据高阶椭圆齿轮副的传动比函数及其节曲线函数的特性,推导出了高阶椭圆齿轮副节曲线的修正方程,通过修正高阶椭圆齿轮副节曲线的设计参数有效减少了高阶椭圆齿轮副叠齿、根切和过切等设计缺陷的发生。文中实例验证了该设计缺陷修正方法的实用性和有效性。     

基于UG的椭圆齿轮的特征参数化建模研究

目前通用的CAD系统中没有直接提供椭圆齿轮建模方法,为此,在分析了椭圆齿轮节曲线和轮齿分布特点的基础上,阐述了椭圆齿轮齿形设计方法和利用UG建模功能及其二次开发工具Expression实现椭圆渐开线直齿轮参数化设计的方法,完整地再现了零件的实体模型特征.结果表明,此方案可使设计人员应用现有的三维模型进行更新设计,并为进一步进行有限元分析、计算机模拟刀具轨迹的生成和数控加工奠定了基础.     

内啮合高阶椭圆斜齿轮副设计方法及实例应用

为促进内啮合高阶椭圆斜齿轮副推广应用,根据最大最小传动比的设计要求,研究内啮合高阶椭圆斜齿轮的实用设计方法,建立了从动轮节曲线数学模型;提供了内啮合齿轮副压力角和重合度校验方法;最后,提供了一内啮合齿轮变速传动机构的设计实例,设计结果表明:所述方法能够正确设计内啮合高阶椭圆斜齿轮副,实现周期性变传动比传动;主动轮压力角及啮合重合度校验合格,齿轮副能够正确啮合。     

非圆齿轮建模和运动学仿真

非圆齿轮具有变传动比、传动平稳的特点,在防滑差速器中得到了广泛的应用。文中详细地阐述了非圆齿轮节曲线的设计方法,并以椭圆齿轮为例,基于Solid Works对椭圆齿轮进行建模和运动学仿真,验证了其设计理论和建模方法正确性。     

椭圆齿轮传动的优化设计

椭圆齿轮传动属于变传动比的齿轮传动，设计计算复杂，工作量大。本文将优化设计的概念引入椭圆齿轮传动设计，提高了椭圆齿轮传动设计的效率和精度。     

斜齿椭圆齿轮CAD系统的研究

研究了斜齿椭圆齿轮轮齿设计方法及计算方程,采用可视化面向对象的编程语言VB 6.0为开发工具对SolidWorks进行二次开发,建立了斜齿椭圆齿轮CAD系统,实现了斜齿椭圆类齿轮的三维参数化建模与动态啮合仿真,解决了斜齿椭圆类齿轮设计中的复杂计算和三维实体造型难的问题。阐述了该系统开发的具体过程、构成、主要模块功能及软件系统的实现。最后以一个3阶斜齿椭圆齿轮的造型实例验证了系统的功能。     

高阶多段拟合椭圆齿轮的设计与研究

提出一种新型非圆齿轮形式——高阶多段拟合椭圆齿轮。采用数学推导与数值计算相结合的方法,建立以二阶椭圆为基础的高阶多段拟合椭圆齿轮节曲线方程。提出传动比极值变化率的概念,以表征周期内传动比极值的变化程度。研究了在以二阶椭圆为节曲线的高阶多段拟合椭圆齿轮传动副中,主动轮与从动轮的转角关系、传动比关系、节曲线无内凹条件及弧长计算等问题,得到了设计高阶多段拟合椭圆齿轮所需节曲线参数的求解方法,采用这些方法并结合实际情况,即可设计出满足要求的高阶多段拟合椭圆齿轮副。     

基于SolidWorks的高阶椭圆齿轮副节曲线设计系统

为了改善非圆齿轮副设计计算复杂、制造困难的问题,以高阶椭圆非圆齿轮为研究对象,以非圆传动啮合原理为理论基础,探讨非圆齿轮节曲线的计算及设计方法。以SolidWorks为开发平台,在VB 6.0环境下开发了高阶椭圆齿轮副节曲线设计系统,该系统包括参数计算模块、节曲线凹凸性校验以及压力角、根切校验模块、曲线绘制模块等,最终通过三次样条曲线拟合,实现了高阶椭圆齿轮副节曲线计算机辅助设计,从而提高了椭圆齿轮传动设计的效率和精度。     

断续展成靠模法铣削椭圆齿轮装置

椭圆齿轮是椭圆齿轮流量计中的关键零件,因为它的加工难度较大,一般用数控机床加工。我厂椭圆齿轮的铣齿是在普通铣床(x62)上利用了一套“断续展成靠模法铣削椭圆齿轮装置”完成的,而且获得了很好的效果,充分发挥了通用设备的加工能力。为了获得椭圆齿轮较准确的齿顶曲线     

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....