轴不对中对叠片联轴器膜片应力的影响

强调对叠片联轴器膜片应力进行分析的必要性,并应用Ｖｉｚｉｃａｄ有限元程序对某种型号的膜片组进行强度计算,给出在不同转矩和不同角不对中情况下的计算结果,并着重分析比较了这两种因素变化对膜片应力大小的影响及其影响程度,其结果对膜片组设计上参考价值。     

综合工况下关节叠片联轴器的接触有限元分析

为研究叠片联轴器挠性元件的应力特性,建立叠片组的接触有限元模型,得到了综合载荷下的应力云图。利用有限元分析软件Ansys,建立叠片组的几何模型,在膜片间添加接触对,并给出了不同载荷的施加方法。分析了片数变化对叠片组应力的影响,得出从四层到九层膜片的叠片组的最大等效应力和最大接触应力的分布曲线。分别研究了在综合载荷作用下转矩、轴向位移和角向位移等单一载荷的变化对叠片组的应力影响情况,得到叠片组中每层膜片的最大等效应力和膜片间最大接触应力分布曲线。研究表明,在各种载荷作用中,角向位移的变化对叠片组应力的影响最大,且综合工况下叠片组的破坏首先发生在外侧膜片垫圈周围。有关节轴承的叠片联轴器相对于普通的叠片联轴器,有更强的角向补偿的能力,关节轴承的存在提高了叠片联轴器承受载荷的能力和叠片组的使用效率。     

膜片联轴器膜片应力计算及疲劳寿命分析

对六孔圆环形和束腰形膜片 ,利用有限元方法和薄板弯曲理论建立膜片应力计算模型。引入改进的局部应力 -应变法 ,建立计算膜片联轴器膜片疲劳裂纹形成寿命的模型和方法。定量分析两种形式膜片的应力、附加载荷的疲劳寿命 ,最后 ,得出对膜片组设计有参考价值的结论     

轴不对中对链板式叠片联轴器膜片应力的影响

对链板式叠片联轴器膜片应力进行了深入的讨论 ,得出在转矩和角不对中作用下的计算模型 ,并着重分析比较传递不同的功率、两轴线间产生不同的角不对中对膜片应力的影响及其影响程度。本文计算结果对设计新型的叠片联轴器有一定的参考价值     

金属圆环形膜片联轴器静动态应力的计算

利用ANSYS有限元程序对金属膜片联轴器中圆环式膜片进行静态和动态应力计算。通过实例求出膜片中静态的3种应力组合总应力和角向弯曲动态应力。其结果不仅为膜片疲劳寿命的计算提供依据，且可定性地分析影响膜片疲劳强度因素。     

膜片联轴器多体接触有限元数值模拟

考虑膜片联轴器实际工作状态下的螺栓预紧力、离心力、扭矩等载荷工况,建立了膜片联轴器的整体有限元模型,采用ANSYS软件对其进行接触有限元分析,得到膜片联轴器的综合位移和等效应力云图,以及膜片组的接触应力分布曲线。通过对存在轴向偏离、径向不对中、角向不对中等安装误差的膜片联轴器的多体接触有限元仿真及对比分析,得出各种安装误差对膜片联轴器力学性能的影响规律。     

金属挠性膜片联轴器的动静复合应力分析

由于轴线间的角向不对中,联轴器旋转时膜片内将产生交变应力,引起疲劳问题.以工程中常见的束腰型膜片联轴器为例,利用有限元软件ANSYS建模,将瞬态动力学方法引入膜片联轴器承受复杂载荷时的应力分析,以模拟其"旋转"状态,研究了转速对于膜片动静复合应力的影响,尤其是对于应力幅的影响,为膜片应力分析提供了一种更为科学的方法.     

大功率膜片联轴器扭转刚度计算研究

作为轴系扭振分析中最重要的参数之一,联轴器扭转刚度是联轴器良好特性必须考虑的基本指标;本文应用有限元法对传递较大转矩的膜片联轴器的膜片应力做出了详细分析,指出了膜片应力分布状况;并对其扭转刚度作了计算分析,计算结果与国外同类型产品非常接近.论文结果为研发大功率膜片联轴器提供了重要参考.     

关节联轴器结构最优设计

提出了叠片联轴器的新结构型式——关节轴承式叠片联轴器 (关节联轴器 )。该联轴器因采用关节轴承 ,使两轴线之间的角向补偿能力由 1 .5°提高到 4°～ 6°,实现了角向补偿能力的突破。用经典力学法和 ANSYS有限元法分析了联轴器中膜片在转矩、角不对中、惯性载荷共同作用下的膜片应力 ,着重分析比较了某一种因素的变化对膜片应力大小的影响及其影响程度 ,得出联轴器的最佳结构形式及其推荐使用范围。     

链板式叠片联轴器强度分析

对链板式叠片联轴器的受力特点进行分析，对其在扭矩和轴向载荷作用下的应力进行了计算，并着重分析比较了传递不同的功率以及叠片组不同的轴向位移对应力的影响及其影响程度。本文计算结果对设计这种新颖的叠片联轴器有一定的参考价值。     

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。     

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.     

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.