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  • 1
    Publication Date: 2012-07-04
    Description: In this investigation, an A356/10%100μm SiCp upward suction casting with a cylinder cavity of 40 mm diameter and 400 mm height was conducted with stirring technique. The SiCp contents in the casting different sections were quantitatively measured with micro digital image analysis system, and then were compared and analyzed. To simulate the casting mold filling, the composite mixture was simulated based on the Euler method while the particulate flow was calculated with the Lagrangian method for predicting the SiCp distribution. The flow of the mixture and particulate phases was analyzed and discussed. The simulated particulate distribution was compared and validated with the experimental results. Both results have shown that the particulate contents decreased along the upward mold filling direction, and that the particulates were prone to be trapped near the mold wall at the filling beginning part due to local lower temperature and higher viscosity and they distributed towards th...
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 2
    Publication Date: 2018-07-31
    Description: Hydraulic and structural performances are two main subjects in the optimization design of hydraulic machines. This article gives consideration to both hydraulic and structural performances during the optimization process of hydraulic turbine with main and splitter blades on the basis of Multidisciplinary Design Optimization (MDO). The aim is to improve the optimization methods of hydraulic turbine, shorten the development cycle time and ensure stable and efficient operation of the unit. Computational fluid dynamics(CFD) and finite element method(FEM) analysis are combined to improve the overall performance of the runner in the multidisciplinary optimization process. The optimization considers the whole runner including the crown and band to get more accurate results of stress distribution. Open Grip program was used to parameterize runner blade and Bezier curve was used to match the bone line and it changed the blades through transforming the bone lines of different profile. NSG...
    Print ISSN: 1755-1307
    Electronic ISSN: 1755-1315
    Topics: Geography , Geosciences , Physics
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  • 3
    Publication Date: 2018-07-24
    Description: Based on connecting aisle of shield tunnel projects in Shenzhen Metro Line 5, in accordance with the complex space structure formed by shield tunnel and connecting aisle, the study chose a three-dimensional numerical model linked by structure and surrounding rock for the calculation and analysis of the stress effect. It showed that due to the connecting aisle construction, the symmetrical deformation of shield tunnel was transformed into unsymmetrical deformation and the crossing segment produced a phenomenon of stress concentration, which caused the production of the upper and lower section of the overall tension of adverse stress form in side opening segment and contact channel structure side themselves. The tension zone of the whole structure was to connect through the lower half of the channel and the surrounding part of segment, so highly attention should be paid to the force structure and waterproof both in design and construction period.
    Print ISSN: 1755-1307
    Electronic ISSN: 1755-1315
    Topics: Geography , Geosciences , Physics
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  • 4
    Publication Date: 2018-11-06
    Description: Virtual Synchronous Generators (VSG), as an effective mean to improve the frequency and voltage regulation ability of the renewable power, had aroused wide concern. Researchers have proposed several VSG implementations, which can be classified into two categories: voltage-controlled VSG and current-controlled VSG. Voltage-controlled VSG have been extensively studied. However, few researches focused on current-controlled VSG. In this paper, we concentrated on the current-controlled VSG and its stability problem. Firstly, a small-signal model of current-controlled VSG was established to identify the oscillation modes of grid-connected VSG system. Moreover, the developed model was used to investigate damping characteristics of the system under various scenarios and with different control parameters. The results revealed that stability of VSG system was sufficiently impacted by virtual inertia and phase lock loop in VSG. Under some unfavourable conditions, current-controlled VSG wou...
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    Electronic ISSN: 1755-1315
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  • 5
    Publication Date: 2017-07-26
    Description: The characteristics of phosphorus (P) adsorption and desorption in Xinjiang gray desert soil (0 - 200 mm) of China in the long-term fertilization condition is affected by the level of soil P content which studied through an isothermal adsorption and desorption experiments of P. The results stated that within the experimental concentration range, with the increase of the amount of outer-source phosphorus, P adsorption, desorption and desorption rate increased and adsorption rate decreased gradually in different Olsen-P levels of gray desert soil in Xinjiang, China. Olsen-P content is significantly correlated with the P adsorption saturation ( DPS ) of gray desert soil. The maximum adsorption capacity ( X m ) of the treatments followed an extremely significant decreasing order of CK〉NPK≈NPKM〉PK≈NPKS. The maximum buffer capacity ( MBC ) and adsorption constant (K) of the NPK treatment was much higher than NPKM, NPKS, PK and CK treatments. And, MBC...
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  • 6
    Publication Date: 2018-02-03
    Description: The temperature field distribution in the medium-voltage vacuum interrupter decides the thermal stability of it. In this paper, the simulation model of a kind of 12kV/3150A/40kA medium-voltage vacuum interrupter is constructed, and conductive bridge model is used. This paper simulates current contraction and Joule heating between contacts, and solves relevant problems using the function of the thermal-electrical coupling in the finite element software ANSYS. Steady-state temperature rise of vacuum interrupter at rated current and transient temperature rise of vacuum interrupter at short-time withstand current are calculated. Influence of the contact situation on vacuum interrupter temperature rise is analyzed. Steady-state temperature rise experiments for the interrupter are carried out, and experiment results verify the accuracy of simulation results. The results are useful in the designing and optimizing of medium-voltage vacuum interrupter.
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 7
    Publication Date: 2017-01-24
    Description: 25 sets of GAC-20 modified asphalt mixture were designed by means of orthogonal design method. The bending and low temperature creep tests of the GAC-20 were carried out. The related models of the fractal dimension and the road performance evaluation index including low temperature bending failure strain ε B and bending strength R B are established by using fractal theory. The model can be used to predict the low temperature performance of GAC-20 modified asphalt mixture according to the design gradation, which can reduce the test workload and improve the working efficiency, so as to provide the reference for engineering design.
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 8
    Publication Date: 2016-09-27
    Description: There is limited research of commercial buildings’ energy use data conducted based on practical analysis in China nowadays. Some energy consumption quota tools like Energy Star in U.S or VDI 3807 in Germany have limitation in China's building sector. This study introduces an innovative methodology of applying energy use quota model and empirical management to commercial buildings, which was in accordance of more than one hundred opened shopping centers of a real estate group in China. On the basis of statistical benchmarking, a new concept of “Modified coefficient”, which considers weather, occupancy, business layout, operation schedule and HVAC efficiency, is originally introduced in this paper. Our study shows that the average energy use quota increases from north to south. The average energy use quota of sample buildings is 159 kWh/(m2.a) of severe cold climate zone, 179 kWh/(m2.a) of cold zone, 188 kWh/(m2.a) of hot summer and cold winter zone, and 200 kWh/(m2.a) of hot summ...
    Print ISSN: 1755-1307
    Electronic ISSN: 1755-1315
    Topics: Geography , Geosciences , Physics
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