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The corrosion of reinforced bar in reinforced concrete structure is the major factor for durability degradation of the structure, while the critical corrosive ratio is important for durability analysis when concrete protective layer been expanding cracked by corrosion. The fracture mechanics numerical simulation tool has been used to study the critical corrosive ratio in this paper and the protective...
Lots of projects history show that the steel corrosion is a main factor to induce the structural damage and premature failure, while the expanding width of corrosive crack is important to determine the durability damage level and residual life of reinforced concrete structures. The fracture mechanics numerical simulation tool has been used to simulate the expanding process of corrosive crack in reinforced...
A 3D flow numerical investigation was performed to explore the effects of spraying angel, structure type and rotation on the combustion property of liquid propellant in combustor AUV. The combustion flow field was simulated using κ - ε turbulence model for gas turbulent, Eddy Dissipation model for gas combustion, six-flux radiation model and particle tracking model for liquid. By Fluent software,...
Due to the decline of the viability and battle effectiveness of the electronic countermeasure armored vehicle caused by intense infrared radiation (IR), the temperature model is built for the IR characterizations of moving target. While taking the effect of radiation, convection and heat transfer into consideration, the mathematic description and simulation of the temperature model are carried out...
The effect of different modeling design on temperature field of headlamp was studied. Numerical simulation of internal temperature field of headlamp was performed and temperature distributing rules were summarized. On those bases, a fast analytical model of temperature field of headlamp was presented considering flow field around the automobile. Taking one headlamp modeling design for example, numerical...
In order to predict gas-liquid-solid multiphase mixing effect in the gas-liquid-solid three-phase reactors, a novel method based on image processing technology, fractal dimension and CFD technology is introduced in this work. Each pattern produced by phase transition in the stirred reactor are continuously eroded and binarized five times. Evolution profile of the fractal dimension slope value P of...
For the complexity of calculating and analyzing the guided wave propagation and defect reflection in steel pipes, and the instructional role on studying the characters of T(0,1) mode guided wave to experimental studies, a method associating guided wave theory with numerical solution was applied to simulate T(0,1) mode guided wave propagation and defect reflection in steel pipes by building models,...
The flow field surrounding an underwater vehicle will change due to the influence from seabed terrains, when it navigates near seabed. The hydrodynamic coefficients of the underwater vehicle will change, and then produce a force and pitch moment, which could pull the underwater vehicle to the seabed. So it's very important for the safety of underwater vehicles while navigating near seabed to predict...
Thunderstorm downbursts, which are sources of extreme wind loadings in nature, have caused numerous structural failures, especially collapses of transmission tower around the world. It is important to study flow characteristics of downburst winds from the perspective of wind-resistant design for downburst-induced high intensity winds. In this paper, the turbulent characteristics of downburst winds...
The flow field of the G4-73 centrifugal fan was numerically simulated with the software of Fluent. The numerical results show that large-scale vortex in volute were push forward, and the scale and intensity of vortex change in different circumferential cross section of the volute. A vortex-broken device was designed based on the idea of decrease flow loss and vortex noise through breaking large-scale...
Based on the analysis of the principle of residual current device (RCD), the impact of sensitivity and unbalance response on the characteristics of residual current transformer (RCT) are discussed in detail. And a kind of RCT is designed by using analytical calculation and numerical simulation methods. Finally, a kind of RCD is developed in this paper. Experimental results show that the designed RCD...
Incentive Stock Option enterprises in developed countries has become the most effective means of encouragement, With the social development, China's domestic enterprises will be implemented gradually equity incentive system, Although only a small part of the company at this stage the implementation of the system, and from stock options trading there is still a long way. In the end of the stock options...
Based on the structural features of projectile and concrete target, projectile damage mechanism and destroyed mode of target materials, utilizing the LS-DYNA which is a program that analyze dynamics to simulate the process of the target being intruded and damaged. The result is cohesive with theory and rules. At the same time, analyzing and validating the result by contrasting result and test result...
When an equipment is attacked by ammunition, ball cartridge experiment of estimating the broken parts in the equipment costs too much, takes long period and is danger to people; comparatively, the simulation method is economical, efficient and safe, which could also forecast the damaged components. In this paper, adopting finite element method, a research has been made on numerical simulation of shaped...
It is a crucial problem in the studies of the fluid on numerical simulations of the interfaces movement in multi-component fluids. Fluid dynamic characteristics are studied during shock waves pass helium bubble in this paper. These methods are used including high resolution discontinuous finite method for Fluid dynamic equations, Level set method for capturing moving interfaces and ghost fluid method...
This paper study OSEM image reconstruction algorithm on different subset of a series of numerical simulated data, through the mean square error of image reconstruction on different subset in the same generation of iteration, analysis effect of reconstructive image and convergence rate. Ordered subsets EM (OS-EM) provides a restoration imposing a natural positivity condition and with close links to...
A formulation based on Kane Equation and kinematics of unmanned powered parachute was educed, which includes free and constraintmode. The velocities of unmanned powered parachute's parafoil and vehicalvehicle which linked to base joint were chosen as generalized velocities. The partial velociy and the partial angular velocity of parafoil and vehical were educed. Develop a 9DOF dynamics model of a...
An improving numerical method is provided in this paper for computing accurate Poincaré Map. Arc-Length integration was introduced and self-adaptive step-length control was developed for avoiding the error accumulation caused by a sharp turn of trajectory within one integration step. Numeric examples are also given, and numeric results demonstrate its accuracy and application.
In this paper, the basic feature of particle system of coal stream is analyzed, the property model of coal stream particle is established by discrete element method according to its characteristics and a moving model is constructed by a simplified Hertz-Mindlin contact, and the coal stream movement is simulated with particle system, which plays an important role in assuring the fidelity and integrality...
In the present study, a series of terminal ballistics numerical analysis and experiments were performed to investigate the process for explosion load drive the based-water extinguisher dispersed. In the Numerical simulation, for the representative fire extinguishing warhead, the simulation model was built, The variety rule between the loading coefficient (drive charge divide liquid mass) and the breach...
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