发动机真空泵异响问题分析及解决

针对某搭载高压直喷发动机的整车出现的真空泵异响问题,通过对异响源测试数据分析、故障件拆解检查等手段明确解决思路,对备选方案进行对比筛选,确定最终解决方案为调整整车P/N档VVT策略。结果表明,所选方案有效地解决了真空泵异响问题,并且此方案对同类发动机的类似问题具有参考意义。     

镶嵌型固体自润滑滑动轴承的摩擦磨损探讨

介绍了金属基镶嵌型固体自润滑滑动轴承在高温下的摩擦特性，分析了这种轴承的磨损机理，并提出在高温及锻压设备上应用的建议。     

特殊爪型真空泵转子型线参数的优化

建立了特殊爪型真空泵转子型线参数优化数学模型,以泵的容积利用系数为目标函数,以保持转子曲线光滑为约束条件对影响转子形状的参数进行了优化选择,得到了满足设计要求的一系列最优参数值.     

NASH锥体型水环式真空泵的性能特点分析

NASH锥体型设计水环式真空泵设计思路独特，具有抽气量大，运行可靠，节能，寿命长等诸多优点，通过锥体型水环式真空泵与普通平面型水环式真空泵的分析比较，详细论述了NASH锥体型水环式真空泵的性能特点。     

水环式真空泵故障分析

针对2BE1-403-0E型水环式真空泵运行现状,系统分析了设备常发故障的原因,并提供了轴承故障分析的经验,供大家参考。     

2BEC型水环真空泵的检测研究

针对2BEC型水环真空泵在煤矿中长时间使用可能会出现泄漏的问题,在对2BEC型水环真空泵的总体结构和工作原理进行分析的基础上,详细分析了水环真空泵真空漏率的检测原理和不同的检测方法,为提升水环真空泵的运行可靠性提供理论参考。     

齿轮的磨损与润滑

齿轮,是机械设备中用得最广泛,且又极为重要的零件,类型多,消耗量大。加工一对齿轮,要比加工其它零件困难得多。齿轮的磨损是摩擦的必然结果。为此,找出影响齿轮摩擦磨损的内外因素,加强对齿轮的维护保养,降低消耗,延长使用寿命,有现实意义。1.齿轮的啮合过程。现以图1所示的渐开线齿轮的啮合为例加以说明。齿轮开始啮合时     

磨损自补偿的摩擦学原理

本文根据已完成的自补偿油润滑下钢－钢摩擦副的摩擦学试验和摩擦表面分析,对比分析了传统的边界润滑和磨损自补偿润滑的不同之处,提出了磨损自补偿的六条摩擦学原理。这些理论该能较好地解释试验结果,为磨损自补偿理论的建立提供了理论依据。     

MMU—5型流体润滑摩擦磨损试验机设计及其性能的研究

论述了ＭＭＵ－５型流体润滑摩擦磨损试验机的设计原理及其结构。试验机的摩擦副由两个外形相同的环状试样组成，下试样固定，上试样由挠性联轴节带动旋转，试样之间的油膜间隙可以在０－６０μｍ之间调节。该试验机为流体润滑条件下三体磨粒磨损的实验研究提供了新的手段。     

爱德华真空泵的维修与改进

爱德华真空泵是属于油封旋片式机械真空泵 ,日常维护检查的内容为观察泵油颜色 ,查看油位 ,检查进、出气口的过滤器。真空泵的常见故障是漏油、不能达到极限真空度和不能启动。判定故障后 ,维修方法是更换老化的密封部件 ,添加和更换新油、清洗油路、更换老化的配油器、旋片和弹簧 ,更换损坏的电源器件和电机线圈等。最后给出真空泵的性能改造位置和方法     

空压机薄板类零件的磨削加工问题探究

为了减少薄板件磨削加工过程中磨削热和避免磨削烧伤,论文通过改善磨削加工工艺方法,使薄板件具有良好的表面质量和平面度。通过最小区域法的交叉准则对工件平面度进行测量,分析改进前后的薄板件的平面度。     

激光涂覆在零件修复中的应用研究

对发动机曲轴轴径的激光修复方法进行了分析研究 ,从而给出了一种可行的用激光涂覆修复已损零件的方法。实践证明用激光涂覆的方法修复曲轴轴径是可行的 ,选择合适的工艺参数 ,可在零件表面得到微细组织的合金层 ,表面光滑 ,成形美观。热影响区窄 ,变形小     

从滑阀式真空泵的失效谈真空泵的维护、检修工艺

在钛合金铸锭生产领域中,滑阀式机械泵是真空自耗电弧炉真空系统必不可少的前级泵。文中针对真空自耗电弧炉用滑阀真空泵的故障、失效情况,论述了泵的维护、保养方法,总结了该泵的检修工艺。     

水环真空泵在制浆造纸真空系统中的选型

结合选型实例,分析在造纸真空系统中水环真空泵选型时要注意的能耗问题。     

Analytical and Experimental Study on Complex Compressed Air Pipe Network

To analyze the working characteristics of complex compressed air networks, numerical methods are widely used which are based on finite element technology or intelligent algorithms. However, the effectiveness of the numerical methods is limited. In this paper, to provide a new method to optimize the design and the air supply strategy of the complex compressed air pipe network, firstly, a novel method to analyze the topology structure of the compressed air flow in the pipe network is initially proposed. A matrix is used to describe the topology structure of the compressed air flow. Moreover, based on the analysis of the pressure loss of the pipe network, the relationship between the pressure and the flow of the compressed air is derived, and a prediction method of pressure fluctuation and air flow in a segment in a complex pipe network is proposed. Finally, to inspect the effectiveness of the method, an experiment with a complex network is designed. The pressure and the flow of airflow in the network are measured and studied. The results of the study show that, the predicted results with the proposed method have a good consistency with the experimental results, and that verifies the air flow prediction method of the complex pipe network. This research proposes a new method to analyze the compressed air network and a prediction method of pressure fluctuation and air flow in a segment, which can predicate the fluctuation of the pressure according to the flow of compressed air, and predicate the fluctuation of the flow according to the pressure in a segment of a complex pipe network.     

协同监控和诊断中一致性求解技术研究

针对制造过程及设备的状态监控问题,提出了监控对象的模糊量状态空间的表示方法,在此基础上建立了包含多监控Agent求解,求解一致性判定和一致性融合求解三个求解模块的协同监控求解系统结构,提出了一种在协同求解一生判定条件下的一致性融合求解技术,用模糊集理论和定义决策相似度的方法建立了多监控Agent求解结果的一致性判定算法,基于监控对象的模糊量状态空间,将各求解结果一致性融合问题转化为群决策略环境下的梯形模糊数表示的模糊意见的综合问题。     

柴油机零件磨损引起燃油超耗的原因与对策

针对柴油机零件磨损会导致柴油机燃油超耗的问题,着重查找分析原因,并指出了实施对策和改进措施,为解决柴油机的燃油超耗问题提供了理论依据和实践经验。     

铁道轮轨曲线侧磨的机理分析及解决方案

本文分析了铁道列车在曲线轨道上运行时产生轮轨侧磨的机理,并且介绍了一种地面式轮轨润滑装置。这种装置借助于列车通过时铁路道床产生的振动信号激励润滑系统工作,将润滑脂通过压缩气体增压泵喷射到轨道侧缘,经轮缘将油脂带到整个轨道曲线上实现润滑。     

Low-Temperature Friction in the XPS Analytical Ultrahigh Vacuum Tribotester

In this work, we present the capability of ultrahigh vacuum analytical tribometry for studying mechanisms of friction at low temperatures. We investigated the low-temperature frictional behavior of two different materials: ice and polyethylene (PE). We successfully formed a thin layer of ice on a steel surface, at temperature as low as 123 K in an ultrahigh vacuum. The surface characterization technique used for this study was X-ray photoelectron spectroscopy (XPS). We investigated the frictional behavior of such a thin ice layer. The changing friction as a function of temperature indicates that the ice might undergo pre-melting even at temperatures below 123 K. A polyethylene (PE) film previously deposited on a metal surface also showed changing friction as a function of temperature in the range 123 to 400 K. As there is no change in the nature of the surface chemistry of the polymer, as indicated by XPS, the results are therefore interpreted in terms of change in ductile-to-brittle transition of the polymer film over the temperature range. This work enables the fundamental investigation of friction at low temperatures with the help of surface analysis.     

V形密封磨损过程特性变化规律的实验研究

对V形密封在整个工作寿命中,轴向挤压应力、轴向压力分布、摩擦力等特性变化进行实验研究.