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1.
抗弹陶瓷的犁削机理和自锐作用研究 总被引:1,自引:0,他引:1
研制了铬刚玉抗弹陶瓷,其抗弹能力比标准均质钢有很大的提高,通过分析讨论,其主要抗弹机制为犁削机理和自锐作用。 相似文献
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Development of an integrated look-ahead dynamics-based NURBS interpolator for high precision machinery 总被引:4,自引:0,他引:4
Methodologies for planning motion trajectory of parametric interpolation such as non-uniform rational B-spline (NURBS) curves have been proposed in the past. However, most of the algorithms were developed based on the constraints of feedrate, acceleration/deceleration (acc/dec), jerk, and chord errors. The errors caused by servo dynamics were rarely included in the design process. This paper proposes an integrated look-ahead dynamics-based (ILD) algorithm which considers geometric and servo errors simultaneously. The ILD consists of three different modules: a sharp corner detection module, a jerk-limited module, and a dynamics module. The sharp corner detection module identifies sharp corners of a curve and then divides the curve into small segments. The jerk-limited module plans the feedrate profile of each segment according to the constraints of feedrate, acc/dec, jerk, and chord errors. To ensure that the contour errors are bounded within the specified value, the dynamics module further modifies the feedrate profile based on the derived contour error equation. Simulations and experiments are performed to validate the ILD algorithm. It is shown that the ILD approach improves tracking and contour accuracies significantly compared to adaptive-feedrate and curvature-feedrate algorithms. 相似文献
4.
Some new error inequalities for a generalized quadrature rule of open type are established. Especially, two sharp inequalities are derived when n is an odd and an even integer, respectively. 相似文献
5.
Bubbles and droplets both consist of a liquid in contact with a gas. In this paper, we consider the interface between the incompressible liquid and the gas as a zero thickness structure. The position of the interface is determined by the equilibrium between surface tension effects and the fluid pressure difference across the interface. So, the structure interacts with the fluids on either side. The behaviour of a limited number of bubbles and droplets can therefore be simulated as a Fluid-Structure Interaction (FSI) problem.Most existing techniques frequently used for studying bubble and droplet dynamics, such as Level Set or Volume Of Fluid, use monolithic schemes. The flow on both sides of the interface and the position of the interface are calculated in a single code. In this contribution, a partitioned approach is presented. The position of the interface is calculated with a structural solver. Given a displacement of the interface, a separate flow solver calculates the flow on the liquid side of the interface with the Arbitrary Lagrangian-Eulerian (ALE) technique. The structural solver uses a reduced order model of the flow solver to obtain implicit coupling between both solvers. This reduced order model is built up during the coupling iterations of a time step. Grid and time converged solutions of two axisymmetric problems are calculated: an oscillating water droplet in air and the growth and detachment of an air bubble from the outlet of a vertical needle, submerged in quiescent water. 相似文献
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A generalized upper bound model of turning operations using flat-faced sharp corner tools with both the side and end cutting edges engaged in cutting is described. The projection of the uncut chip area on the rake face plane is divided into a few regions separated by lines parallel to the chip flow direction at transition points. The area of each of these regions is transformed to the area of the corresponding regions of the shear surface using the ratio of the shear speed to the chip speed. Summing up the area of these regions, the total shear surface area is obtained. The tool-chip contact length at vertices is obtained from the length along the shear surface using the similarity between orthogonal and oblique cutting in the “equivalent” plane (the plane formed by the cutting velocity and chip velocity). Knowing the tool-chip contact length, the friction area is calculated. The chip flow angle and chip speed are obtained by minimizing the cutting power with respect to both these variables. Comparison of the chip flow angle predicted by the current model with the chip flow angle measured by direct high speed photography of the chip motion over the tool rake face shows good correlation between the two for various tool geometries and cutting conditions. The shape of the shear surface and the chip cross section predicted by the model are also presented. 相似文献
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Hierarchical mesh segmentation based on fitting primitives 总被引:11,自引:0,他引:11
In this paper, we describe a hierarchical face clustering algorithm for triangle meshes based on fitting primitives belonging
to an arbitrary set. The method proposed is completely automatic, and generates a binary tree of clusters, each of which is
fitted by one of the primitives employed. Initially, each triangle represents a single cluster; at every iteration, all the
pairs of adjacent clusters are considered, and the one that can be better approximated by one of the primitives forms a new
single cluster. The approximation error is evaluated using the same metric for all the primitives, so that it makes sense
to choose which is the most suitable primitive to approximate the set of triangles in a cluster.
Based on this approach, we have implemented a prototype that uses planes, spheres and cylinders, and have experimented that
for meshes made of 100 K faces, the whole binary tree of clusters can be built in about 8 s on a standard PC.
The framework described here has natural application in reverse engineering processes, but it has also been tested for surface
denoising, feature recovery and character skinning. 相似文献
10.