介绍一种很好的润滑方法

我厂熟料窑煤粉制取用的球磨机,主传动齿轮所采用的润滑方式很简单,但实际润滑效果却很好。该工序中的1~#、2~#球磨机已运行11年,大齿轮的齿面仍如新齿轮一样,无磨损痕迹。该球磨机采用释油强制润滑方式,其流程如图1所示。     

带式啮合介质齿轮传动

研究提出一种以柔性带作为啮合介质的齿轮传动.给出带式啮合介质齿轮及其基准齿条的合理齿廓和齿厚计算方法;在电功率流封闭式齿轮试验台上进行该传动与渐开线齿轮传动的性能对比试验以及水、油润滑性能对比试验:根据试验结果优选介质带进行传动性能和疲劳寿命试验.结果证明,介质带能改善齿轮的流体润滑、降噪、减振,使齿面不易损坏,降低制造工艺要求,并可能实现水润滑.     

内啮合齿轮传动系统的热弹流润滑特性分析

为探究内啮合齿轮传动的热弹流润滑特性,考虑多种齿轮传动类型及不同变位系数和的影响,建立了内啮合齿轮传动的热弹流润滑模型,分析了内啮合齿轮系统的热弹流润滑特性。结果表明,与其他齿轮传动类型相比,对于采取变位的内啮合齿轮传动系统,当实现正传动时,其润滑效果最佳,在啮合轮齿间可以形成较厚的润滑油膜,摩擦因数和油膜的最高温升最小,热胶合承载能力最强;当实现正传动时,适当增加内齿轮与行星齿轮的变位系数之和,可以进一步改善内啮合齿轮齿面的润滑特性,但同时降低了油膜刚度。     

粗糙齿面接触应力与齿轮转速关系的理论探析

通过实测获得了具有横向纹理的表面粗糙度数据,借助傅立叶非线性变换,形成了近似真实分布的齿面粗糙度函数;将此函数叠加到油膜厚度方程中,构建了渐开线直齿圆柱齿轮传动混合弹流润滑模型。基于该模型,分别针对中、重载齿轮传动,通过改变小齿轮转速之值,共进行了约130组数值计算。结果表明,增大齿轮转速可有效改善齿轮润滑状态、降低齿面接触应力;然而,当转速增至一定值后,接触应力随转速的下降幅度十分缓慢。     

谐波齿轮传动齿面润滑计算的研究

本文将摩擦学理论应用到谐波齿轮传动中,针对谐波齿轮传动的啮合原理、运动关系、载荷分布、柔轮及轮齿受载后产生弹性变形等特点,建立了可行的齿面最小油膜厚度计算公式,为谐波齿轮传动齿面润滑状态的分析奠定了基础。     

浅谈机械设备齿轮减速器的润滑问题

机械设备中的齿轮减速器的工作性能和使用寿命固然与减速器的几何参数设计、材质、加工、热处理、装配及使用操作诸多因素有关。齿轮工作时,由于在相互啮合的齿面间存在相对滑动,所以齿面要产生摩擦和磨损,对于高速齿轮传动,齿面间的摩擦磨损更为严重,故润滑在齿轮传动中是非常必要的。本文介绍了机械设备齿轮减速器润滑原理及分类,同时阐述了机械设备中齿轮减速器润滑方式的选择。     

齿轮润滑中的原位聚合膜的发展与应用

齿轮润滑中的原位聚合膜的发展与应用东北大学机械工程学院陈卓君杨文通丁津原一、前言目前齿轮传动向着体积小、重量轻、功率大方向发展，因此齿面接触应力不断增大，除高速齿轮传动外，绝大多数齿面润滑状态是边界润滑（或混合润滑），齿面间不存在完整的流体润滑膜。为...     

某型直升机行星齿轮机构弹流润滑研究

分析了某型直升机主减速器行星齿轮机构弹流润滑工况,研究了该齿轮系弹性润滑最薄弱啮合部位,计算得出了行星齿轮传动机构中齿宽、齿轮模数和压力角等齿轮参数对弹性润滑油膜厚度的影响,提出了改进直升机主减速器行星齿轮机械润滑状态的新思路和具体改进方案,结果证明增加行星轮和太阳轮的齿宽、模数和齿轮啮合角及提高润滑油粘度和粘压系数,可有效地改进齿轮润滑,减少齿面失效,提高行星齿轮传动机构的可靠性。     

基于弹流润滑理论的斜齿圆柱齿轮油膜厚度参数影响研究

基于弹性流体动力润滑理论,建立了斜齿轮传动润滑最小油膜厚度计算公式,并利用Matlab程序绘图功能绘制出最小油膜厚度沿啮合线的变化曲线,计算分析了传动比、模数、压力角、螺旋角、重合度、齿宽系数等斜齿轮传动参数对齿轮副节点处润滑油膜厚度的影响,从而揭示了斜齿轮传动参数与齿轮副润滑性能之间的关系,为弹流润滑条件下斜齿轮传动的设计提供了一定的理论依据。     

直齿圆柱齿轮传动摩擦学设计模型的构建

齿轮传动是最重要的机械传动形式之一。传统的齿轮传动强度设汁方法没有考虑润滑要求,而润滑设计又不能兼顾强度需要。以赫兹理论和弹流润滑理论为基础,建立了直齿圆柱齿轮传动的摩擦学设计模型,基于此模型对齿轮传动进行设计,对提高其使用寿命具有重要意义。     

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.     

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.     

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.     

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.     

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...