Papers by Keyword: Numeric Simulation

Abstract: This paper approach the study of the dynamic behaviour of a real gear with asymmetric teeth which will replace the current gear with symmetrical teeth. Research approach is founded on two questions: How does the error of the flank's tooth form influence the dynamic behaviour of a gear How is the dynamic behaviour influenced by the configuration of a gear with asymmetric teeth compared with a gear with symmetric teeth, with comparable accuracy

Abstract: One of the ways to increase efficiency of the solar absorber is modification of absorption area in the system of pyramidal cavities, where the incident radiation is absorbed by multiple reflections. The paper deals with the technology of production of the flow solar absorber with a structured surface in a single technological operation using hydroforming. Two laser-welded sheets are inserted into the forming chamber. Then the space between them is pressurized with hydraulic fluid which causes their form to the desired shape. The first part of this article describes hydroforming device. The second section deals with theoretical simulation of forming a different structured surface in the programming environment of ANSYS. As follows practical test of hydroforming is performed. Austenitic stainless steel X5CrNi18-10 was used as a material for the production of samples.

Abstract: The pressed oil-extraction process is essentially a process of oil seepage through porous cake-shaped media. Permeability of seepage field changes along with the change of porous media caused by press pressure. The change of permeability affects fluid pressure and effective pressure of oil cake pores, which means that porosity is influenced. On the contrary, the change of porosity also has an impact on permeability. The interaction between the seepage and rheology fields is termed as fluid-solid coupling. If rheology of oil cakes is considered, the fluid-solid coupling seepage with the rheological properties is the essence of the pressed oil-extraction process. In the present study, we studied a permeability model based on the deformable and rheological properties of oilseed cakes and the effective stress. The seepage and rheology fields were analyzed by alternative application of the finite difference and finite element methods. The finite element calculation model of nonlinear rheology field was established by the time step-initial strain method. We used flax and cotton seeds as examples to perform numerical simulation and calculate the displacement and pore fluid pressure dissipation of flaxseed and cottonseed oil during the press process.

Abstract: The article in question concerns the proposal of a pressure vessel for a water heater made of plastic materials. At present, new materials and technologies are coming to the fore where the product price, above all, plays an important role, taking into account the relevant physical and strength properties. The pressure vessels of larger volume (more than 10 litres) water heaters are only manufactured using steel materials under European Union conditions. The proposal considers the use of an alternative material, namely plastic. By optimising the proposal – by the use of plastic materials – it would be possible to achieve a financial economy, since plastic is a good thermal insulating material and does not require enamelling or the use of a cathode protection. There are plastics available on the market which meet the requirements of heat resistance and have a relatively high tensile strength. One of these proposed materials is Noryl GFN1630V which contains 30 % of glass fibre and was chosen as the optimal material. By making strength calculations in the ANSYS programme, water heater pressure vessels were proposed.

Abstract: Based on meteorological field output by MM5 mesoscale meteorological model and concentration field output by CALPUFF air quality model, “flux method” was applied to study effects of long-range transport of air pollutants on the atmospheric environment, in which micro-element method was used to solve the process of air pollutants transport in long-range of three-dimensional space. This method was first applied in studying a construction project’s impact on air quality in Guanzhong region of Shanxi Province. The results shows that the deviation of flux method is less which the value is 16 percent, and among all year around, the pollutants transport the more flux to the ENE and WSW directions of the project compared to other directions. Additional, the flux of fall and winter is more than it of spring and summer, and the project has a more severe influence of atmospheric environment in Xi’an city than it of Weinan city.

Abstract: There exist angular offset and eccentricity between target and substrate in most practical multi-target magnetron sputtering systems, which should be seriously considered when we calculate the film distribution. This simulation results suggested that excellent thickness uniformity can be obtained when increased the substrate-target distance, angular offset, and eccentricity, but decreased the film thickness simultaneously. However, superior uniformity films without reducing the thickness remarkably can also obtained when the geometry configuration are proper configured.

Abstract: In this paper, an optimized method of orthogonal experiment design is studied to determine the processing parameters in order to minimize the warpage of the supporting-foot plastic part. Considering the injection processing parameters such as melt temperature, mold temperature, injection time, packing pressure and packing time, a series of CAE simulation experiments are applied to reveal the warpage. The relative significance of each processing parameter on warpage is also acquired based on the range analysis of the results. Finally, verification test with the optimal levels of the processing parameters is also carried out.

Abstract: A multinest storm surge-wave-sediment model is applied to simulate strong storm surge caused by winter storm in Bohai Bay in Oct, 2003. The fields of current and sediment of for- and post- regulating structure are calculated to analysis the effect of regulation. The results show that the alongshore current caused by storm surge strengthen the cross-channel component and that provided the impetus conditions for sediment transport. The siltation in the outer channel of Huanghua port in the second stage is very severe. For example, the thickness of slitting sediment in the area, 3~19 kilometers (away from the entrance of port) is over 2.0 meters. While the third stage dike for debris barrier is completed, the hyper-concentrated silt-laden flow offshore could be eluded, and the maximum deposition area goes out thus the sediment siltation is reduced.

Abstract: A new technology of high efficiency concasting based on inner-outer couple cooling of molten steel in a mould has been advanced, that is to set an inner cooling apparatus, U shape pipes, in a mould. The flow status of molten steel in mould with inner cooling apparatus is analyzed by using fluid dynamics analysis software FLUENT, and compared with that without inner cooling apparatus. It is found that the inner U-shape cooling apparatus can make molten steel flow with a lower impact depth which is favourable to inclusion in steel floating up.

Abstract: On the basis of established mathematic model of regenerator heat transfer process, the process of heat transfer of ceramic honeycomb regenerator with the method of simulation is studied. The temperature distribution curve of regenerator and gas is obtained, the temperatures curve of regenerator and gas are closely related to time is investigated ,and the influence of operation and structure parameter to heat transfer of regenerator is discussed. All this work is to provide guides of rational design of single-ended regenerative burner.