Three-dimensional flow past an elliptic cylinder with aspect ratio of 0.5 near a moving bottom wall is investigated numerically for gap ratios G / D = 0.1 , 0.2 0.3 and 0.4 (where denotes the between wall, major-axis length cylinder) Reynolds numbers (Re) ranging from 100 to 200 (based on constant inlet velocity cylinder); transition two- three-dimensional regimes described in detail. For 0.4, ...

The present hydraulic variable-pitch mechanism of wind turbine uses three hydraulic cylinders to drive three crank and connecting rod mechanisms respectively; the blades are moved with the cranks. The hydraulic variable-pitch mechanism has complex structure, occupies a lot of space and its maintenance is trouble. In order to make up for the shortcomings of hydraulic cylinder variable-pitch syst...

The slow dynamics of topological solitons in the CP σ-model, known as lumps, can be approximated by the geodesic flow of the L metric on certain moduli spaces of holomorphic maps. In the present work, we consider the dynamics of lumps on an infinite flat cylinder, and we show that in this case the approximation can be formulated naturally in terms of regular Kähler metrics. We prove that these ...

Isometric modification is proposed as a new method of axial modification of spur bevel gear. Based on the gear geometry theory and the normal meshing motion equation of gear pairs, changes of meshing points and angles are analyzed and the effect of axial modification on meshing movement of gear pairs is discussed. After that, a method of drawing spherical involute with the aid of SolidWorks sof...

Abstract The explicit expression of Eshelby tensors for one-dimensional (1D) hexagonal quasicrystal composites is presented by using Green’s function method. closed forms in the special cases spheroid, elliptic cylinder, ribbon-like, penny-shaped, and rod-shaped inclusions embedded 1D matrices are given. As an application tensors, analytical expressions effective properties derived based on Mor...

This thesis focuses on reliability when testing gear efficiency and on how gear mesh efficiency can be increased without detrimental effects on the gears. Test equipment commonly used in gear research was analysed to identify important parameters for gear efficiency testing. The effect of the bearing model’s load-dependent losses on gear mesh efficiency was also investigated. Two different surf...

Older people may be advised to switch from manual to automatic gear shifting, because they may have difficulties with dividing their attention between gear shifting and other driving tasks such as perceiving other traffic participants. The question is whether older drivers show a better driving performance when using automatic gear shifting instead of manual gear shifting. Twenty young and twen...