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In order to research the evolution of permeability and damage of fractal rock under hydraulic fracturing, a new damage variable that describing relative reduction of pore amounts as radius is bigger than r any fracturing stage is defined. Assuming the process of evolution of micro-fracturing is in accord with standard model of Logistic bifurcation theory, according to energy conservation principle,...
A test platform based on hydro-pneumatic suspension was set up to research the pressure characteristic of damping hole of this kind suspension. A series of experiments on damping holes of different diameters were carried out, and the pressure on both sides of damping holes were recorded. A mathematical model of this platform was established using knowledge of fluid mechanics; various parameters of...
By analyzing the shortcomings of various types of cycloid drive, a kind of new cycloid drive that named as output-pin-wheel cycloid drive is innovated. The structure of reducer and the structural dimensions of specific components are designed by analyzing its working principle. In order to validating the correctness of drive model and assembly relations of parts, a three-dimensional solid modeling...
The optimization design for a wheel was implemented in this paper. The rim stiffness finite element model, 13-degree impact strength finite element model and bending analysis finite element model of the wheel were established firstly. The influence of the rim stiffness, wheel impact strength and bending fatigue strength of the wheel were synthetically considered. The constrained variable metric method...
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