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Effect of active control on optimal structures in wall turbulence

Science China(Physics,Mechanics & Astronomy) 2013年第2期56卷 290-297页

作者： DENG BingQing XU ChunXiao HUANG WeiXi CUI GuiXiang AML Department of Engineering MechanicsTsinghua University

The effect of active control imposed at the wall on optimal structures in wall turbulence is studied by using a linear transient growth *** the detection plane of the control is located in the buffer layer,the influence of the control on the transient growth of large scale motion becomes negligible as Reynolds number ***,if the control signal is detected at the plane located in the logarithm region,the transient growth at large scale can be greatly *** peak values of transient growth resulting from the strong blowing and suction on the wall *** study indicates that a proper selection of control imposed on the wall can suppress the large scale motion in the logarithmic region.

关键词： active control optimal structure wall turbulence

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Improvement of Mechanical Properties of Wood-Plastic Composite Floors Based on the Optimum Structural Design

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Acta Mechanica Solida Sinica 2016年第4期29卷 444-454页

作者： Yang Zhang Ping Xue Yun Ding Mingyin Jia Jianchen Cai Xiaoming Jin College of Mechanical and Electrical Engineering Beijing University of Chemical Technology College of Mechanical Engineering Quzhou University

A study is carried out on the structural design of wood-plastic composite floors. The geometric parameters of the cavities, the structure, and the means to optimize the performance of these light boards are investigated. Various structural parameters of the boards, such as size, shape, and the pattern of cavities are also studied. The optimal structure can be determined by calculation and analysis of the strength, stiffness, weight and cost of the material. A finite element model for the mechanical analysis of wood-plastic composite floors is established; and the results are used to verify the strength criteria under bending deformation, which is the most common loading condition of flooring board.

关键词： wood plastic composite cavities flooring board optimal structure the finite element model

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Synthesis and cost estimation of ethylene oxide process using PRO/Ⅱ

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Journal of Measurement Science and Instrumentation 2013年第4期4卷 385-391页

作者： Suri Park Sangwook Han Yongho Hong Byungjick Kim Department of Chemical Engineering Soongsil University

Ethylene oxide （EO） is a sold-out intermediate material for producing various *** chemical companies are interested in whether new EO plant can create *** research is undertaken to investigate the economic feasibility of EO *** oxidation of ethylene using silver on alpha-A12O3 catalyst type is adapted to produce EO of 60 000 t/*** conduct the conceptual ***,we synthesize the optimal structure and then determine optimal conditions and the size of the *** study shows that profit and loss turning point turns out to be 3.2 years based on the present market *** addition,we conducts the economic analysis to prepare the risk of raw material market price variation ranging from 70％ to 130％.

关键词： ethylene oxide (EO) PRO/Ⅱ simulation optimal structure feasibility studyDocument code:AArticle ID:1674-8042(2013)04-0385-07

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