Advanced Materials Research Vols. 875-877

Abstract: In the article are presented as figures numerical data calculation of the basic thermodynamic variables such as dependence of the thermodynamic potentials from the temperature and pressure, and the geometric characteristics of the dynamics like the center of mass of trial particle. The dynamics is described by a simple Euler discretization of family of vector fields arising in the Bogdanov-Takens bifurcation.

Abstract: Magnetic sealing drive torque is designed and calculated and analyzed, Magnetic circuit and whole structure of the drive are designed, simulating and analyzing to Magnetic circuit of Magnetic sealing drive by ANSYS software, Magnetic field distribution and the effect to torque in model is analyzed and researched. It is shown that the results between theoretical calculation and analysis of the finite element are quite close.

Abstract: This paper presents a generalized formulation to calculate an approximation of the complex potential function due to a flow past over any distribution of circular cylinders with different radius and circulation. To validate the formulation, the stream function over different configurations of cylinders is calculated. As an example, the potential complex function of three different configurations of cylinders in the z-plane is studied. In addition, in order to show the interference among the cylinders, the velocity and pressure distribution are also calculated.

Abstract: High finishing machining tool path generation methods are usually adopted for five-axis computer numerically controlled machining of sculptured surface parts. The quality of the high finishing machining has an important effect on that of the surface. In this paper, a high finishing machining tool path generation method is introduced to generate an optimal tool path. The initial tool path is firstly created based on the constant scallop height, then the derived tool paths are generated as a kind of the diagonal curve by the initial tool path, and at last, the tool path smoothing algorithm is applied to the generated tool path. This path algorithm can ensure higher level of smooth of the surface been machined. Finally, the results of simulation and experiment of the machining process are given to verify the smooth and applicability of the proposed method.

Abstract: Basic oxygen furnace (BOF) gas dry dedusting technology is the main orientation of steelmaking industry. It has technical superiority in high efficiency energy conversion, energy saving and emission control and clean environmental protection fields, and it can decrease water consumption greatly, have high efficiency for steam and gas recovery, and reduce environmental pollution, and it is a key technology for realization of high-efficiency energy conversion in the contemporary steelmaking. The evaporating cooler is a key facility of temperature control for the BOF gas; it plays an important role in dedusting process. The CFD numerical simulation on flow characteristics of BOF gas in evaporating cooler has been accomplished. The gas velocity distribution, temperature distribution and dust distribution in the evaporating cooler are simulated by CFD. According to the result of research, a number of optimizations are applied in engineering, and have been proven by the outstanding performance in operating practice.

Abstract: An important aspect in the combustion of coal for purposes of generating clean power is to achieve that this solid fuel is gasified and hereby to capture the residues across different mechanisms and to use the gas of synthesis in the production of energy. Gasification has been widely studied but the amorphous characteristics of solid fuels causes the gasification reactions do not obey a defined order, however has been made possible prosecute kinetics of these reactions and orient products of synthesis gas, according to needs. In this regard, for purposes of power generation the hydrogen production at high rates is a problem of stability of the synthesis gas combustion, therefore their generation in the gasification should be controlled by the generation of methane priority and carbon monoxide. The objective of this work is to provide guidance with a theoretical tool to establish the optimal mix of solid fuels in relation to the gasifying agents to produce a synthesis gas with appropriate levels of hydrogen, for which genetic algorithms are used due to approach a problem nonlinear and multiple variables. The variables that control the generation of products of synthesis gas, corresponds to the amount of steam and oxygen /air relative to fuel flow fed to the gasification reactor. The results show that there may be many possibilities for feeding the gasifier, but there are defined relationships that can control with some limitations the hydrogen production in convenient relationships with carbon monoxide. In the third multiobjetive runEn la tercera corrida del algoritmo multiobjetivo, se tiene la menor cantidad de cenizas y una participación muy alta de los carbones del Cesar en la mezcla. In the third run of the multiobjective algorithm, it has the least amount of ash and a very high share of coal in the mix of Cesar.

Abstract: Considering the growing importance of energy-efficient building methods, timber construction will play an increasingly important role in the future. In order to determine advantages and disadvantages of using wood as a leading constructional material, different construction types were compared: solid wood, wood-frame, concrete, and brick construction. To quantify the comparisons the analytic hierarchy process (AHP) was applied. AHP enables the inclusion of various parameters, including descriptive ones, in a mathematical model through which the importance of each construction criterion forming part of the system can be calculated in order to provide objective decisions for construction. Analysis revealed that the top ranked criteria in decision-making include embodied energy, construction cost and design. On comparing different construction types the wood-frame construction, which can have very low or negative carbon footprint, was considered as the most suitable option for public building.

Abstract: Applying variation principle, the analytical nonlocal Euler-Bernoulli beam models for wave propagation in fluid-filled single-walled carbon nanotubes are established. The novel nonlocal governing equations are derived and used in wave propagation analysis. Comparing with partial nonlocal Euler-Bernoulli beam models used previously, the novel analytical nonlocal models predict stiffness enhancement of CNT and wave decaying at high wavenumber or high nonlocal effect area. Though the novel analytical model is less sensitive than partial nonlocal model when fluid velocity is high, it simulate much high nonlocal effect than the corresponding partial model in many cases.

Abstract: Based on three-dimensional models of key components, a thermoelastic finite element model of disc brake is established. The results of stress field and temperature distribution are acquired considering the relationship of heat convection coefficient and wheel angular velocity. The effect of heat convection coefficient fluctuation and disc material conductivity fluctuation on the model output is analyzed. The simulation results shows that disc temperature is not sensitive to heat convection coefficient, but sensitive to thermal conductivity. And this model mentioned in this paper is of great significant for building a temperature finite element model with engineering accuracy.

Abstract: The intake system sub-model, the fuel dynamics sub-model and the power output sub-model are studied in this paper based on Elbert Hendricks engine mean model. Engine output characteristics using computational model is established in MATLAB/Simulink. Parameter of the modeling and simulation process is obtained through experiments, and finally, the engine bench test is done, and compared it with the simulation curve in same conditions. The results show that the model calculation has smaller error, higher precision, and which can meet the basic requirements of the engine modeling in actual control.