双联齿轮行星轮系任意装配理论研究及相应最小装配侧隙分析

以3个均布双联齿轮组成的行星轮系为例,对双联齿轮在任意自身错位角情况下如何利用行星轮系的装配侧隙来实现行星轮系的装配做了深入的理论研究,依据其研究成果形成了一套可实现双联齿轮行星轮系任意装配要求的最小装配侧隙分析方法,并通过实物装配得以验证。设计双联齿轮行星轮系的最小装配侧隙来实现行星轮系的任意装配,对于小批量制造的成本控制与提高生产效率具有重要意义。     

行星齿轮传动装配条件及斜齿双联行星轮传动的齿数选择

本文从新的角度推导了装配条件公式,这个公式简单明了只需计算一次,即可判断是否符合装配条件。本文利用此式还论证了如下观点:带斜齿的双联行星轮传动的齿数选择,可不受上述装配条件的限制,只要螺旋角选取适当,任意齿数均是可行的。从而大大地扩大了这种结构的齿数选用范围,使速化符合实际需要。     

基于啮合功率法的行星轮系效率计算研究

对于传递动力、特别是传递较大动力的行星轮系,进行效率计算是十分必要的。针对应用最多的2K-H型行星轮系,运用啮合功率法,推导出行星轮系效率计算的简化公式。利用所推公式,不必判断转化轮系中啮合功率的流向,只要求出转化轮系的效率和传动比就可以计算出行星轮系的效率。同时,绘出行星轮系效率与转化轮系传动比关系曲线图并进行详细的分析,为行星轮系的设计与选用提供了理论指导。     

应用2K-H型行星轮系原理改进结构设计

应用２Ｋ－Ｈ型行星轮系原理,对普通车床的皮带轮进行了改进设计,以满足生产需要对机床转速参数的要求,并对计算该种行星轮系的效率公式进行了理论推导,总结出计算效率的统一公式,简化了计算步骤。     

应用2K—H型行星轮系原理改进结构设计

应用２Ｋ－Ｈ型行星轮系原理,对普通车床的皮带轮进行了改进设计,以满足生产需要对机床转速参数的要求,并对计算该种行星轮系的效率公式进行了理论推导,总结了出计算效率的统一公式,简化了计算步骤。     

确定NGW行星轮系各轮齿数的计算程序框图

作者在保证满足NGW行星轮系传动比条件、同心条件及装配条件的基础上,导出确定NGW行星轮系内中心轮齿数z_1的计算式,并将该计算与众所周知的配齿公式及邻接条件验算公式进行综合,设计出能直接用于确定NGW行星轮系各轮齿数的计算程序框图。     

2K-H行星轮系均载设计浮动件选取原则

以2K-H行星轮系为对象,用解析方法研究制造装配误差条件下该行星轮系均载问题。给出载荷传递弹簧串并联力学模型,基于几何等量关系推导行星轮系均载与啮合间隙和齿轮啮合刚度的关系式。采用向量表达方法,推导制造误差和装配误差引起啮合齿对圆心偏动时、相互啮合齿对在啮合线上的间隙计算公式,依据间隙计算公式对浮动均载进行分析,得到浮动均载计算多元方程组,求解方程组给出如下结论:(1)当行星轮数n3时,基本构件浮动可以补偿制造装配误差引起的轮系偏载。(2)当行星轮数n≥4时,行星轮的误差不能够通过基本构件的浮动来补偿,只能通过行星轮的浮动来补偿。同时给出了浮动量的理论计算方法,并进行了有限元仿真,有限元仿真结果与本文理论计算结果高度一致。     

双联齿轮轮齿对中检测装置

1问题的提出图1是挖掘机转向机构的行星轮系。轮系中有4个如图2所示的双联行星齿轮，为保证顺利装配，要求4个双联齿轮间的A、B齿轮轮齿圆周方向偏差凸。在0．02mm以内。但由于齿轮A、B是分两次安装插齿加工而成的，要保证这样的精度很困难。为此我们设计了一套双联齿轮轮齿对中检测装置，用它测出A、B齿轮轮齿的圆周方向偏差4，然后根据检测结果进行分组装配，既保证了装配精度要求，又降低了加工工艺要求。2结构及Xi作原理测量装置结构如图3所示。被测齿轮12由内孔及端面定位安装在定位台13上。定位头11固定在滑板7上，测头10通过销子…     

HD4070PR自动变速箱运动分析及速比计算

AT自动变速箱越来越多地运用在各类汽车上,其行星结构的齿轮传动结构比较复杂,通过对行星轮系的研究,推导出各级行星轮系的传动比公式,对研究A T自动变速箱有指导意义。     

齿轮参数对行星轮系模态的影响

使用Catia对行星轮系进行实体建模,通过有限元分析软件workbench的高效率模型导入功能实现了Catia和Workbench的联合仿真,对行星轮系模型进行动力学模态分析,提取了前9阶固有频率和主振型。在其他参数不变情况下,先对行星轮系中所有齿轮的模数进行改变并对行星轮系进行模态分析,结果表明固有频率随模数增大而减小：在其他参数不变情况下,再对行星轮系中所有齿轮的压力角进行改变并对行星轮系进行模态分析,结果表明固有频率随压力角增大而增大。     

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...     

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。     

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。     

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.     

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.     

Fifth International Summer School on Screw-Theory Based Methods in Robotics

正3-11 September,2014University of Bologna,Bologna,Italy www.summerscrews.org summerscrews2014.ing.unibo.it SUMMER 20SCREWS 14In 2014,our screw-theory school comes to the world's oldest university.In early September,Summer Screws'14 will gather six experts in the application of screw theory in robotics and up to 40 participants at the University of Bologna,Bologna,Italy.The school will teach attendees how to apply existing methods and empower them to develop new ones in their own research.The basic theoretical notions will be introduced in a rigorous manner,emphasizing examples,applications,and exercises.Scholarships are available.     

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。     

INDUSTRIAL ENGINEERING AND VISUALISATION-A PRODUCT DEVELOPMENT PERSPECTIVE

Taking the actual project of teaching and researching process for example, the relationship between the industrial engineering and product development is discussed. And use the novel visualization technology to support the industrial engineering and product development. How to use the new computer modeling and simulating technologies to support the product development and industrial engineering, is introduced especially. The support includes both domestic products and industrial systems. The visualization and computer technologies take a very important role in some system or multi-direction modeling, those technologies mentioned above can help the industrial engineers study the effect of design on the whole life circle, including the producing steps. So the engineers can avoid making the wrong decision which may cause bad effects on the whole industrial engineering.     

Non-monotonic material contrast in scanning ion and scanning electron images

30 keV Ga⁺ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z₂, and shows a non-monotonic relationship between contrast and Z₂. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z₂, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.