By this, the development of lubricant additive formulations that provide friction reduction while retaining anti-wear benefits, are a logical path for investigations in order to resolve the lubrication problems. 2.2.5 Engine wear Wear, as well as friction, is a characteristic of engineering systems,...
Scale inhibitors are utilized to prevent the buildup of calcium sulfate, calcium carbonate, and barium sulfate scale that can cause flow assurance problems in production wells. As the well is fractured, water dissolves minerals in the formation, and the scale can be formed if the conditions are...
11 values of the Hurst exponent ranging from 0 to 1 were studied. All values shown below were obtained by averaging over 200 realizations of the rough surface for each set of parameters. Parameter studies have been carried out for 20 different normal forces FN ranging from 1021 to 101 N, ...
Regulatory fragmentation and level playing field problems act as disenablers to appropriate realisation of FinTech in the European Union. While regulatory inertia has been shaken off in favour of willing regulatory engagement and responsiveness to the FinTech agenda, much remains to play for. Even ...
From some numerical results of a plate rolling problem, it is demonstrated here that the BEM can be used to efficiently and accurately analyze this class of forming problems.Hong XiaoYiming ChenGuangxian ShenTatsuhiko AizawaJunji Kihara中国机械工程学报Xiao Hong,Chen Yiming.Three-dimensional elastic-...
被引量: 11发表: 1984年 A Consistent Finite Element Formulation of Nonlinear Frictional Contact Problems The consistent tangent operator is always non- symmetric for the case of frictional sliding owing to the nature of the Coulomb's friction law employed... JW Ju,RL Taylor,LY Cheng - Springer...
Figure 5 shows the sorting of data layer by layer from root nodes to leaf nodes when the model tree processes problems. The tree leaf nodes can represent the problem types and apply a linear multivariate regression model to quantitative analysis of each subdomain. Therefore, the model tree can...
Modelling and numerical approach to a class of metal‐forming problems—Quasi‐steady case nonlocal frictionvariational analysismodified variable stiffness parameters methodFE analysisA class of quasi-steady metal-forming problems, with rigid-plastic, ... TA Angelov - 《Mathematical Methods in the Applie...
1, in many problems most of the viscous effects are limited to a thin region adjacent to the solid surface. This thin viscous region is called the boundary layer. For such a region, the governing equations,Eqs. (1)–(5), can be reduced to the boundary layer equations, which in two-...
In this thesis, we consider a class of controland planning problems for robots dynamically interacting with theirenvironment. We address challenges that arise from non-smoothmotions induced by contact, where discontinuities result fromimpact events and frictional forces. First, we examine the problemof...