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Model optimization method and connected-pipe experiment of a liquid fuel ramjet engine

航空动力学报 2013年第6期28卷 1277-1285页

作者： MA Qian-rong GUO Xin WU Hu CHOU Qian School of Power and Energy Northwest Polytechnical University Aero-Engine Altitude Simulated Key Laboratory China Gas Turbine EstablishmentAviation Industry Corporation of China

The optimization method of a mathematical model and connected-pipe experimental technique for a test in altitude test facility (ATF) of a liquid fuel ramjet engine was *** optimization of the simple mathematical model was divided into two ***,using the test engine's geometry configuration size data,a preliminary adjustment was ***,using experimental test data,the components' experiential coefficients were modified *** was laid on the simulation technique of flight condition and parameters measurement *** experimental technique was applied to a ramjet ATF test *** comparison results show that the optimized-model has higher precision and the nozzle gross thrust difference drops from 12% to about 4%.

关键词： ramjet engine model optimization altitude test facility(ATF) connected-pipe experiment simulation technique

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The Influence of the Magnetic Field on the Electrical Breakdown Phenomena

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Plasma Science and Technology 2007年第1期9卷 45-51页

作者： M.RADMILOVI -RADJENOVI B.RADJNOVI Institute of Physics P.O.Box 5711001 BelgradeSerbia Vin a Institute of Nuclear Sciences P.O.Box 522BelgradeSerbia

A simple phenomenological model and detailed simulation studies of the breakdown phenomena in argon and nitrogen under the simultaneous action of electric and magnetic fields are presented in this paper. Expressions for the breakdown voltage have been derived taking into account variations of both the ionization coefficient and the secondary electron yield in a magnetic field. Calculations were performed by using XOOPIC code, an Object Oriented Particle in Cell code, with both the original and the improved secondary emission model with inclusion of the influence of the magnetic field on the secondary electron production. The simulation results presented here clearly show that the inclusion of the dependence of the secondary electron yield on the magnetic field leads to better agreement with existing experimental results.

关键词： breakdown voltage ionization coefficient secondary electron emission simulation technique

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The risk management of perishable supply chain based on coloured Petri Net modeling

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Information Processing in Agriculture 2018年第1期5卷 47-59页

作者： Lu Liu Xinlei Liu Guangchen Liu School of Transportation Ludong UniversityYantai 264000China School of Mathematics and Statistics Science Ludong UniversityYantai 264000China

The supply chain of perishable products is a combination of information organization,sharing and *** information modeling of supply chain is constructed to abstract key quality information including environment information,processing procedures and product quality assessments based on principle of quality safety factors and property of decay *** coloured Petri Net is applied for integrated description of independent information classification,aiming at risk identification and risk management ***,according to the quality deterioration tendency,risk grades management and decision-making system are ***,the circulation system of aquatic products is studied in this paper for full processing *** simulation experiments are manipulated on environmental information,processing information and product quality information by the coloured Petri ***,the conclusion turns out precisely as such that the coloured Petri Net conclusive for information classification and information transmission while integrated information management is available of efficient risk identification and decision-making system in supply chain of perishable ***,the validity of evaluating management and shelf-life estimation of perishable products are technically feasible.

关键词： Petri nets Supply chain Risk management simulation technique Perishable product

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STRUCTURAL CHANGE IN HEAT AFFECTED ZONE AND ITS INFLUENCE ON PROPERTIES OF WELDED WHITE CAST IRON

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Acta Metallurgica Sinica(English Letters) 1991年第9期4卷 191-195页

作者： ZOU Zengda WANG Yong REN Dengyi Shandong Polytechnic University,Jinan,China Shandong Polytechnic Univ Jinan China

The structural change in heat affected zone(HAZ)and its influence on properties of welded white cast iron have been investigated by means of thermal cycle simulation *** structure of the white cast iron at peak temperature 800℃ was examined as cementite in pearlitic matrix,of which the hardness and impact toughness are the lowest,while the struc- ture after cyclic heating at high peak temperature is mainly cementite together with twin martensite,of which the hardness and impact toughness are rather *** phase bounda- ries in the structure of low hardness are smooth and regular as well as with fine precipitates. Both the cleavage and interphase fracture were revealed in the structure of low hardness,while the transgranular fracture was found in those areas of higher hardness.

关键词： white cast iron heat affected zone simulation technique

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板材成形模拟技术在汽车工业上的应用

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特殊钢 2002年第Z1期23卷 35-37页

作者：李飞鹏欧阳可居胡道钟陈吕罡东风汽车公司工艺研究所十堰442001

　　汽车覆盖件具有结构尺寸大、形状复杂、材料薄、成形质量高等特点,从它的产品设计、工艺分析确定、模具设计、制造、调试到最终产品是一个相当复杂的过程.影响汽车覆盖件成形的因素有很多,如模具的形状、板材性能、毛坯形状、板料... 详细信息

　　汽车覆盖件具有结构尺寸大、形状复杂、材料薄、成形质量高等特点,从它的产品设计、工艺分析确定、模具设计、制造、调试到最终产品是一个相当复杂的过程.影响汽车覆盖件成形的因素有很多,如模具的形状、板材性能、毛坯形状、板料与模具的摩擦及其它边界条件等.……

关键词：板材成形模拟技术汽车工业应用 Automobile Industry simulation technique 汽车覆盖件成形毛坯形状模具设计结构尺寸工艺分析成形质量产品设计边界条件板材性能制造摩擦调试材料板料

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