English  |  正體中文  |  简体中文  |  Items with full text/Total items : 52048/87179 (60%)
Visitors : 8880269      Online Users : 119
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library & TKU Library IR team.
Scope Tips:
  • please add "double quotation mark" for query phrases to get precise results
  • please goto advance search for comprehansive author search
  • Adv. Search
    HomeLoginUploadHelpAboutAdminister Goto mobile version
    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/111396

    Title: 應用序列二次規劃於上表面半橢圓形條型泡棉最佳化設計
    Other Titles: Application of sequential quadratic programming to the optimal design of corrugated foam with semi-elliptical strip profile
    Authors: 許文才;Shiu, Wen-Tsai
    Contributors: 淡江大學機械與機電工程學系碩士班
    葉豐輝;Yeh, Fung-Huei
    Keywords: Biot多孔彈性理論;有限元素頻域分析;脈衝響應;吸音係數;序列二次規劃;Biot’s Poroelastic Theory;Finite Element Frequency Domain Analysis;Impulse response;Sound Absorption Coefficient;Sequential Quadratic Programming
    Date: 2016
    Issue Date: 2017-08-24 23:51:45 (UTC+8)
    Abstract: 本文旨在探討含飽和流體條型泡棉之上表面半橢圓形吸音係數最佳化設計。本研究使用Biot多孔彈性理論於頻域中並應用Galerkin型態有限元素法推導二維四邊形元素之剛性矩陣及荷重向量,給予材料參數及邊界條件,直接求得泡棉上表面流體與固體之平均位移,並計算求其動態複數勁度(CDS)與吸音係數(SAC)。
    This thesis attempted to provide an optimal design of semi-elliptic sound absorption coefficient on the surface of corrugated foam mixed with saturated fluid. Biot’s poroelastic theory was integrated into the study of frequency domain, Galerkin type finite element approach was employed to derive the rigid matrix as well as the force vector of two-dimensional quadrilateral elements, and with the given material parameters and boundary conditions, the mean displacement of fluids and solids on the surface of foam were obtained. Based on the results stated above, the complex dynamic stiffness (CSD) and sound absorption coefficient (SAC) were obtained.
    Firstly, analysis method was validated to make sure it was appropriate for this study. The results indicated that the complex dynamic stiffness and sound absorption coefficient on the surface of elliptic border were exactly the same as the results released by previous researchers. Apparently, the finite element frequency domain analysis (FEFDA) employed by this study was sufficient to simulate porous materials’ sound absorption coefficient precisely. Secondly, sequential quadratic programming (SQP) was employed to analyze the optimization of semi-elliptic sound absorption coefficient on the surface of corrugated foam, attempting to find out the optimal sound absorption coefficient of different sectional width ratios (MWR) at low frequency (0~2000Hz), medium frequency (1000~3000Hz), and high frequency (2000~4000Hz), respectively. According to the analysis results, optimal sound absorption coefficient was gained when foam was restricted by same area in which MWR was 0.33, 0.34, and 1.31 at low frequency, medium frequency, and high frequency, respectively.
    Appears in Collections:[機械與機電工程學系暨研究所] 學位論文

    Files in This Item:

    File Description SizeFormat

    All items in 機構典藏 are protected by copyright, with all rights reserved.

    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library & TKU Library IR teams. Copyright ©   - Feedback