轮胎异常磨损机理及对策

轮胎是支撑车辆重量，传递驱动和制动力矩，提高吸振和包络能力的总成部件。应具有一定的抗磨性、低滚动阻力、耐久性、保证转向稳定性和安全性等特点。论述了轮胎与路面之间的摩擦机理；并从使用、检修和道路影响等方面，分析轮胎异常磨损的影响因素及原因；提出减轻轮胎磨损的对策。     

金刚石刀具磨损机理的探讨

分析和探讨了金刚石刀具的磨损形态和磨损机理，提出了金刚石刀具在制造与使用时应注意的若干问题。     

基于铣削力参数化模型的铣刀非均匀磨损状态监测方法研究

在航空结构件钛合金零件数控加工中,刀具非均匀磨损状态对工件的最终质量影响很大。为了及时发现并控制因刀具非均匀磨损导致的异常加工状态,对钛合金加工刀具非均匀磨损状态监测方法进行了研究。建立了基于刀具刃线参数化模型的铣削力参数化模型,实现了对钛合金加工刀具非均匀磨损状态的监测,解决了零件单件或首件加工中样本数据缺失条件下的钛合金加工刀具非均匀磨损状态准确监测难题。     

磨损机理的定量分析方法

本文利用模糊数学的基本思想,根据磨损面积,磨损深度及磨损后续效应三个评价指标对磨损机理进行了定量分析,并以颗粒饲料压粒机压模的磨缶失效分析为对本方法进行了验证,计算结果与实际分析一致,该方法为定量判别磨损机理提供了基础。     

切削奥氏体不锈钢的涂层刀具磨损机理探讨

通过不锈钢0Cr18Ni9切削加工的刀具寿命试验,探讨涂层刀具的磨损形态和机理,提出涂层刀具切削奥氏体不锈钢时刀具的磨损形态主要为边界磨损的观点,并验证了YBG202涂层刀具适合切削奥氏体不锈钢。     

汽车轮胎磨损机理的研究

综合分析了汽车轮胎和路面间相互作用产生的磨损形式和磨损机理,以及研究轮胎磨损常采用的方法。运用摩擦学原理提出了轮胎磨损的分类形式,为正确预测正常工作条件下的轮胎磨损率提供了必要的基础知识。     

非均匀磨损套管空间有限元分析

针对非均匀磨损套管进行了空间有限元分析,研究了磨损量、磨损长度、轴向拉力对套管抗内压强度的影响.计算结果表明非均匀磨损套管的抗内压强度随磨损厚度的增加而降低;不同的磨损长度对套管抗内压强度影响不明显,即抗内压强度主要受磨损厚度的影响;套管轴向拉力对其抗内压强度影响不大,并且这种影响随着磨损量的增加而逐渐减小.通过对磨损套管抗内压强度变化规律的研究,为合理制定井控措施提供了科学依据.     

摩擦磨损机理现代概念及磨损计算探讨

本阐述材料摩擦磨损机理的现代概念,认为由于摩擦时进行的物理,物理化学和机械过程的综合结果,使摩擦表面磨合过程的作用导致二次组织的产生,二次组织的特征和性能对摩擦副的耐磨性有着决定性的影响。根据现代概念建立的零件磨损率一般公式及其简化公式与根据粘着理论模型建立的Archard公式比较,指出了过去的理论与计算的弊端。     

基于轮胎磨损的悬架改进设计

轮胎作为汽车与地面唯一的接触部分,对汽车来说是十分重要的.为了更好的降低车辆行驶过程中轮胎磨损程度,提高整车性能,因此本文通过ADAMS/CAR建立前悬架模型,并对悬架参数进行仿真分析,并对悬架进行改进设计.本文主要基于ADAMS/CAR软件建立某款乘用车麦弗逊前悬架模型,从而对悬架的K&C设计参数进行仿真分析;最后根...     

基于有限元方法的轮胎磨损特性研究

在基于有限元法的轮胎磨损性能评价方法的基础上,建立了205/55/R16型子午线轮胎2种胎面结构的有限元模型。使用ABAQUS软件的显式分析方法获得轮胎接地区域节点在汽车行驶过程9种工况下的法向反力和滑移速度,通过摩擦能量损失和磨损量之间的关系,求得轮胎在组合工况下行驶特定里程的磨损量。光面轮胎的磨损量明显小于花纹轮胎磨损量的仿真分析结果,说明了仿真分析方法的有效性。同时,通过对ABAQUS软件的二次开发,实现了轮胎接地区域摩擦能量损失率分布的实时描述。     

Numerical calculation of irregular tire wear caused by tread self-excited vibration and sensitivity analysis

Tire wear negatively affects vehicle safety and riding comfort. Abnormal wear is more dangerous and wears tires out more quickly. In this paper, numerical and sensitivity analyses of polygonal wear caused by unstable vibration are presented. The model used for this study was based on the works of Sueoka. Tread self-excited vibration was analyzed in a quantitative sense, which was qualitatively different from the work of Sueoka. Wear was plotted on tire circumference visually. The mechanism governing polygonal tire wear was investigated as that both the polygonal wear and the standing wave are caused by two types of tread vibrations that only differ in the extent of the tread vibration. Sensitivity analysis shows that decreases in tread mass and stiffness and increases in tread damping lead to noticeable reductions in tire wear. This information could help tire manufacturers produce tires that exhibit less wear caused by tread vibration.     

流体振源引起石油化工管线振动的分析

以某炼油厂的一条加氢管线振动为例，对管线中流体振源引起的振动问题从现场测试和数值计算等方面进行了分析和研究，提出了一套用于减轻石油化工管线振动的分析方法。     

Arithmetic of automatically forming meridian tire tread pattern on basis of unigraphics

Tire tread pattern affects the performance of motor vehicles and traffic safety; therefore, designing it accurately is very important. This paper mainly discusses the arithmetic that can form tire tread patterns automatically and rapidly. The algorithm flow is given. Then, the principle of planar picture creating three-dimensional patterns concretely is analyzed. The experimental results of the meridian tire pattern based on the UG API function prove the feasibility and excellence of the proposed method.     

电梯导靴引起的振动

本文对电梯运行时导靴的非线性摩擦影响进行了数学模型分析，提出了抑制自激振动的各种措施，同时将结果推广于自动扶梯扶手带的蠕动运行和对电梯平层的影响，文中对导靴引起的瞬态振动也进行了适当的说明。     

轮胎胎面参数在线检测系统研究及应用

为了提高汽车轮胎生产过程中对胎面尺寸的测量精度,针对移动中的橡胶胎面设计了一种测量轮胎胎面参数的在线检测系统。选用3D激光传感器,根据传感器获得的坐标数据绘出胎面横截面轮廓,基于B样条曲线拟合方法,通过特征点测量计算胎面横截面数据;选用CCD图像传感器,设置两端基准线,根据现场亮度采用可调光源控制器,并采用OSTU算法对图像进行二值化处理,基于像素数和实际的尺寸存在线性对应关系,可获得胎面长度。现场实验结果表明,该测量系统的横截面参数测量精度小于1 mm,长度测量精度小于2 mm,能够满足生产工艺的测量要求,可实现胎面参数的在线动态测量,该测量系统具有安装方便、运行稳定等特点。     

Bore wear caused by firing steel monoblock bullets

The peculiar character of bore wear by steel monoblock bullets is presented. An effect of the turbulence of propellant gas with erosion particles on the wear of the near-surface bore layers in the process of firing is discovered.     

Finite element prediction of blanking tool cost caused by wear

The total cost of a blanked part is determined by a large number of factors, including the material cost, manufacturing costs. Predicting the manufacturing costs of a blanked part requires accurate estimation of tool cost caused by wear. The aim of this paper is to develop a finite element model allowing for the numerical prediction of the blanking tool life which allows for the evaluation of the cost rate of blanking tool caused by wear needed to assess the total cost of a blanked part. A wear prediction model has been implemented in the finite element code Abaqus in which the tool wear is a function of the normal pressure and some material parameters. In the present work, the tool is modeled as rigid body hypothesis, and the wear variables are computed in the contacting elements. The altered tool contact surface and contact pressure tool shapes are updated iteratively to simulate wear over a long period of time of about 100,000 cycles. A damage model is used in order to describe crack initiation and propagation into the sheet. The distribution of the tool wear on the tool profile is obtained and compared to industrial observations.     

42CrMo钢振动磨料磨损研究

为研究振动对材料磨损的影响,对经过低温、中温、高温回火的42CrMo钢在自制的振动磨料磨损试验机上进行了振动磨损实验.结果表明,试样的塑性、硬度及磨料的振动参数综合影响其耐磨性,磨损量并不与磨料的振动频率成正比,磨粒的振动影响材料的磨损形貌.     

圆锥轴承滚道误差导致其磨损的分析

通过对圆锥轴承滚道磨损机理的分析,找到了滚道制造误差和磨损现象的关系,对提高轴承的疲劳寿命具有重要意义。     

岸边集装箱起重机风振动研究

针对岸边集装箱起重机(简称岸桥)的结构特点及其工作环境的特殊性，采用Wilson-θ法推导了脉动风压作用下结构的动力响应计算公式，通过编制风振计算分析程序，对实际的岸桥进行风振计算机仿真。