As the most important working area of gear, teeth play the role of transmitting load and power. Tooth line and tooth profile are the two main characteristics of the tooth surface, which affect the shape of the tooth surface, tooth meshing characteristics and contact characteristics. Taking the elliptical cylinder gear pair in the reversing device of a new type of drum pumping unit as the resear...

This paper reports the parallel implementation of adaptive mesh reenement within nite diierence ocean circulation models. The implementation is based on the model of Malleable Tasks with ineeciency factor which allows a simple expression of the diierent levels of paral-lelism with a good eeciency. Our goal within this work was to validate this approach on an actual application. For that, we hav...

Article history: Available online 17 February 2016

In the numerical simulation of the combustion process and microstructural evolution, we need to consider the adaptive meshing problem for a domain with a moving boundary, in which, the submesh in the region behind the moving boundary needs to be coarsened while the submesh in the region ahead of the moving boundary needs to be reened. In this paper, we present a uniied scheme for simultaneously...

Periodical impulse component is one of typical fault characteristics in vibration signals from rotating machinery. However, this component is very small in the early stage of the fault and masked by various noises such as gear meshing components modulated by shaft frequency, which make it difficult to extract accurately for fault detection. The adaptive line enhancer (ALE) is an effective techn...

Ground-penetrating radar GPR attenuation-difference analysis can be a useful tool for studying fluid transport in the subsurface. Surface-based reflection attenuation-difference tomography poses a number of challenges that are not faced by crosshole attenuation surveys. We create and analyze a synthetic attenuation-difference GPR data set to determine methods for processing amplitude changes an...

In particle-tracing radiosity algorithms, energy-carrying particles are traced through an environment for simulating global illumination. Illumination on a surface is reconstructed from particle “hit points” on the surface, which is a density estimation problem [ I l l . Several methods can be used to solve this problem, such as the adaptive meshing method [14], the kernel method [Is], and the ...

Finite element methods have been applied extensively and with much success in the analysis of orthopaedic implants. Recently a growing interest has developed, in the orthopaedic biomechanics community, in how numerical models can be constructed for the optimal solution of problems in contact mechanics. New developments in this area are of paramount importance in the design of improved implants ...

We describe a family of quadrilateral meshes based on diamonds, rhombi with 60◦ and 120◦ angles, and kites with 60◦, 90◦, and 120◦ angles, that can be adapted to a local size function by local subdivision operations. The vertices of our meshes form the centers of the circles in a pair of dual circle packings in which each tangency between two circles is crossed orthogonally by a tangency betwee...

Obtaining accurate solutions for convection–diffusion equations is challenging due to the presence of layers when convection dominates the diffusion. To solve this problem, we design an adaptive meshing algorithm which optimizes the alignment of anisotropic meshes with the numerical solution. Three main ingredients are used. First, the streamline upwind Petrov–Galerkin method is used to produce...