scholarly journals SET UP OF A DETERMINISTIC CALCULATION MODEL FOR THE ANALYSIS OF FUSION-FISSION HYBRID SYSTEMS

2021 ◽  
Vol 44 (2) ◽  
pp. 42-46
Author(s):  
F. Panza ◽  
◽  
M. Carta ◽  
A. Cemmi ◽  
N. Cherubini ◽  
...  
Keyword(s):  
Hybrid Systems ◽  
Calculation Model ◽  
Set Up

Study on a Numerical Model of “Rainfall-Runoff” Process Combined with Snowmelt

2012 ◽  
Vol 518-523 ◽  
pp. 4273-4277
Author(s):  
Huang Jinbai ◽  
Wang Bin ◽  
Hinokidani Osamu ◽  
Kajikawa Yuki
Keyword(s):  
Numerical Method ◽  
Wave Theory ◽  
Large Error ◽  
Calculation Model ◽  
Surface Flow ◽  
Snow Melt ◽  
Rainfall Runoff ◽  
Surface Water Resources ◽  
Permissible Range ◽  
Set Up

In order to achieve the accurate calculation of “rainfall-runoff” process combined with snowmelt and to provide a useful numerical method for estimating surface water resources in a basin, a runoff numerical calculation model of “rainfall-runoff” process combined with snowmelt was developed for a distributive hydrological model. Numerical method on “Rainfall-runoff” process was set up by applying kinematic wave theory, and calculations on snowmelt were made using energy budget method. Validity of the model was verified through numerical simulation of the observed surface flow. Results of the error analysis indicated that a large error existed between the numerical results and the observed ones without considering snowmelt whereas the error was at the permissible range of criterion (< 3 %) by considering snowmelt. The results showed that the snowmelt calculation should be considered at snow melt area when performing the runoff calculation.

Heat Exchange Calculation of a Regenerative Air Heater with Numerical Simulation Method

2013 ◽  
Vol 860-863 ◽  
pp. 1416-1419
Author(s):  
Ri Guang Wei ◽  
Zhen Xiao Qu ◽  
Jian Qiang Gao
Keyword(s):  
Numerical Simulation ◽  
Simulation Method ◽  
Calculation Model ◽  
Design Parameters ◽  
Practical Calculation ◽  
Air Preheater ◽  
Air Heater ◽  
Pulverized Coal Boiler ◽  
Set Up ◽  
Coal Boiler

According to the structure and working principle of rotary air preheater,the heat transfer calculation model is set up with reasonable simplification. Combining with the design parameters of the rotary air preheater of a 400 t/h pulverized coal boiler unit ,the results of practical calculation show that the said thermodynamic calculation method not only has higher precision of calculation,but also can get the temperature distributions of the gas, air and heat surface in each cross-section of the rotary air preheater. The result of numerical simulation calculation tallies well with the original designed data. It can be used for the heat calculation both two-sectorial and three-sectorial air heater; it can be used for performance analysis of the regenerative air heater.

Experimental Study on In-Plane Behavior of CFST Arch with New-Type Dumbbell-Shaped Section

2011 ◽  
Vol 255-260 ◽  
pp. 1198-1203 ◽  
Author(s):  
Ye Sheng
Keyword(s):  
Local Buckling ◽  
High Strength ◽  
Steel Tube ◽  
Calculation Model ◽  
Plastic Behavior ◽  
Loading Process ◽  
New Type ◽  
Set Up ◽  
Ultimate Load Carrying Capacity ◽  
Shaped Section

The weakness of traditional dumbbell-shaped section is that when concrete is filled into the web space, great stress is likely to produce cracks in the weld sealing between steel tube and web plates. In order to avoid this condition, a new-type dumbbell-shaped section is proposed. Experiments on concrete filled steel tubular (CFST) model arches with new-type dumbbell-shaped section have been carried out, concentrated loading at crown and L/4 section respectively. The result indicated that the new-type CFST arch has good elastic-plastic behavior and high strength, no local buckling appeared during the whole loading process, its in-plane mechanic behavior is similar with that of the CFST arch with single-tube. The dual nonlinear finite element calculation model is set up for the model arch, by means of this model the load-deflection curves during the loading process and the ultimate load-carrying capacity is analyzed.

Research on Efficiency Model of the Variable Hydraulic Pump Based on System Identification

2012 ◽  
Vol 184-185 ◽  
pp. 421-428 ◽  
Author(s):  
Xiang Sheng Li
Keyword(s):  
System Identification ◽  
Functional Relationship ◽  
Least Square Method ◽  
Calculation Model ◽  
Least Square ◽  
Hydraulic Pump ◽  
Polynomial Expression ◽  
Identification Theory ◽  
Set Up ◽  
Axial Piston

For the complication and imprecision of the calculation of efficiency about variable hydraulic pump, based on system identification theory and thought of identification with the modeling，the general polynomial expression is proposed to describe the efficiency of variable hydraulic pumps and the functional relationship between parametric and to set up the model using the least square method of parameters identification, and calculation model of the efficiency is established as an example for a type of axial piston variable hydraulic pump, the model is verified by the experimental data, and it’s fitting accuracy is over 87%.

Study on Effect of Excavation Depth on Internal Force of Retaining Structure of Arc Row Piles with Arc Ring Beam on the Pile Top

2014 ◽  
Vol 919-921 ◽  
pp. 762-768
Author(s):  
Zhi Wei Zhang ◽  
Rong Gui Deng ◽  
Ze Shuo Chen
Keyword(s):  
Internal Force ◽  
Calculation Model ◽  
Structure Calculation ◽  
Foundation Pit ◽  
Engineering Research ◽  
Retaining Structure ◽  
Body Distribution ◽  
Practical Engineering ◽  
Set Up ◽  
Deformation Compatibility

In order to control deformation of foundation pit effectively and guarantee safety of building around, utilizing the stress characteristics of arch, use the new spatial retaining structure of arc row piles with arc ring beam on the pile top. The arc ring beam can provide constraint to pile top, so internal force of pile body distribution is uniform, and improve the integrity stability of piles. The ring beam with compression mainly can give use of high compression capability of concrete. According to the high order statically indeterminate characteristics of the retaining structure, calculation model of ring beam and pile respectively is established by the redundant forces between beam and pile top. By using deformation compatibility to set up flexibility equation of the retaining structure, and solve the redundant forces, then calculate the internal force and displacement of ring beam and piles. Through calculating the practical engineering, research the effect of excavation depth on internal force and displacement of piles and the arc ring beam on the pile top.

Numerical Calculation of Spray and Combustion with Heating Fuel in a Medium Speed Diesel Engine

2013 ◽  
Vol 316-317 ◽  
pp. 1162-1165
Author(s):  
Xiao Yi Lai ◽  
Cheng Cheng Zhang ◽  
Zhou Rong Zhang ◽  
Jian Zhi Li ◽  
Qian Wang
Keyword(s):  
Surface Tension ◽  
Diesel Engine ◽  
Combustion Process ◽  
High Viscosity ◽  
Calculation Model ◽  
Low Temperature Combustion ◽  
Fuel Temperature ◽  
Marine Diesel ◽  
Set Up ◽  
Cfd Method

The fuel usually has high viscosity and low quality for marine diesel engines. Especially for its shallow combustion chamber structures, the preparation of in-cylinder mixture gas is mainly rely on spray and atomization, which is vulnerable influenced by fuel viscosity and surface tension seriously. Based on the case, this paper introduced a CFD method to heat the diesel fuel to reduce fuel viscosity and surface tension, expecting to explore the in-cylinder combustion process and emissions generation, so that the atomization effect of fuel spray and combustion in diesel could be improved. The calculation model was set up according to the L23/30H diesel engine. Temperature field and pressure field in cylinder were calculated and the emission of NO were studied under conditions of different fuel temperatures. The results show that the increasing of fuel temperature is helpful to realize low-temperature combustion and reduce NO emission to some extent.

Study on Web Parameters of Prestressed Concrete Composite Box Girder with Corrugated Steel Web

2011 ◽  
Vol 255-260 ◽  
pp. 1087-1091
Author(s):  
Xia Lin Yang ◽  
Lin Min Niu ◽  
Rong Ling Zhang ◽  
Guo Xiang Wei
Keyword(s):  
Finite Element ◽  
Prestressed Concrete ◽  
Composite Beams ◽  
Calculation Model ◽  
Finite Element Calculation ◽  
Element Calculation ◽  
Box Girder ◽  
Corrugated Steel Web ◽  
Set Up ◽  
Warping Stress

Taken the Chongqing PC composite box girder with corrugated steel web for background , spatial finite element calculation model is set up by adopting the mixed unit, the influence about geometric parameters of corrugated steel perforation is analyzed by used linear and nonlinear finite element calculation of steel box girder .It shows that bending stress and warping stress was reduced by increasing the bending angle of corrugated steel webs of composite beams, while the buckling strength improved obviously; the ratio of the top slab and the floor slab maximum thickness of box girder to the corrugated steel perforation should be about 20; the mechanical properties of composite beams will be improved by reducing the length of straight slabs of corrugated steel webs.

scholarly journals A Calculation Model to Estimate the Electrical Performance of a Photovoltaic Panel

2021 ◽  
Vol 65 (2-4) ◽  
pp. 256-263
Author(s):  
Mario A. Cucumo ◽  
Vittorio Ferraro ◽  
Dimitrios Kaliakatsos ◽  
Francesco Nicoletti ◽  
Albino Gigliotti
Keyword(s):  
Experimental Data ◽  
Mechanical Energy ◽  
Electrical Power ◽  
Calculation Model ◽  
Electrical Performance ◽  
Photovoltaic Panel ◽  
Electrical Efficiency ◽  
The Mean ◽  
Set Up ◽  
The University

In this study, the thermal and electrical modeling of a photovoltaic panel is performed to evaluate its temperature profiles, electrical efficiency and the electrical power supplied. The energy balance equations under transient conditions of all the layers that make up the panel are discretized by the finite difference technique and solved with the implicit method. The results are validated with experimental data provided by an experimental set-up located on the roof of a building of the Department of Mechanical, Energy and Management Engineering (DIMEG) of the University of Calabria. The comparison with the experimental data allows us to see an excellent approximation of the distribution of temperatures inside the panel and in particular of the photovoltaic cells, accurately evaluating the effect on electrical efficiency and the electrical power supplied. The validation was performed with reference to a clear winter day and a clear summer day. The mean square error was about 1.5°C on the panel temperature and about 3 W on the electrical power (1.2% of the maximum power).

Research and Analysis about the Effects of Curved Bar-Tied on Arch Bridge’s Structural Performance

2012 ◽  
Vol 226-228 ◽  
pp. 1567-1570 ◽  
Author(s):  
Shu Qing Zhao
Keyword(s):  
Calculation Model ◽  
Structural Performance ◽  
Highway Bridge ◽  
Arch Bridge ◽  
Model Studies ◽  
Finite Element Software ◽  
Different Types ◽  
Set Up ◽  
Tied Arch Bridge ◽  
Main Bridge

When designing under-supported bar-tied arch bridge, the type of bar-tied usually is straight. But sometimes based on design or the needs of some aspects, curved bar-tied is often used. Taking the main bridge of XinZhang highway bridge as the background, this paper, by using general finite-element software to set up calculation model, studies and analyzes the effects of different types of bar-tied on the arch bridge’s structural performance. Through the analysis, we know that it is not suitable to choose curved bar-tied for under-supported bar-tied arch bridge when designing and constructing.

Mechanical properties of self-tapping screws and nails in wood

2002 ◽  
Vol 29 (5) ◽  
pp. 725-733 ◽  
Author(s):  
Klavs Feilberg Hansen
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
Research Programme ◽  
Simple Calculation ◽  
Calculation Model ◽  
Steel Connections ◽  
Dowel Action ◽  
Bending Capacity ◽  
Pull Through ◽  
Set Up

This paper presents results of a research programme investigating the mechanical properties of self-tapping screws and nails in wood. The programme consisted of deformation-controlled tests to determine embedment strength, withdrawal strength, pull-through strength, bending capacity of individual screws, shear strength of screwed and nailed wood–wood connections, and shear strength of screwed wood–steel connections. All test specimens showed ductile behaviour. Based on the results from the first four types of tests, a simple calculation model for the shear strength of screwed wood–wood and wood–steel connections was set up and compared with test results from the last two types of tests. The calculation model took dowel action and friction (wood–wood and wood–steel) into account and showed excellent agreement with the test results.Key words: connections, screws, nails, shear strength, embedment strength, withdrawal strength, pull-through strength.

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