国产bbaaaaa片,成年美女黄网站色视频免费,成年黄大片,а天堂中文最新一区二区三区,成人精品视频一区二区三区尤物

首頁> 外文學位 >Closed-loop flow control approaches for VARTM.
【24h】

Closed-loop flow control approaches for VARTM.

機譯：VARTM的閉環(huán)流量控制方法。

獲取原文
獲取原文并翻譯 | 示例
  • 摘要
  • 著錄項
  • 相似文獻
  • 相關主題

摘要

VARTM (Vacuum Assisted Resin Transfer Molding) is a liquid composites manufacturing process that offers numerous advantages over other processes because of the low tooling costs and the manufacturing benefits for large structures. During the infusion of resin into a closed mold that contains a preform in VARTM process, resin flow is often affected by the inherent variations in permeability resulting from the part design as well as the variability associated with the mold lay-up. Current injection methods used for VARTM provide; very limited control of the resin flow within the mold: this can result in part defects including dry (unfilled) regions and voids. A definite need exists to continue to improve the part quality especially to eliminate the dry spots and voids. Improved control of resin flow appears possible with several approaches including the development of a multi-segment resin injection line that provides real time modifications to the resin flow front.; The overall goal of this study is to demonstrate practical control strategies for VARTM that provide control of the resin flow within the mold. The potential benefits of this capability are significant. Control of the flow will reduce the presence of voids in finished parts thus decreasing the number of rejected parts. Current manufacturing methods minimize void formation by extending the injection time to promote full mold infusion; better control of the resin flow will reduce the need for extended infusion times thus increasing production efficiency. (Abstract shortened by UMI.)
機譯：VARTM（真空輔助樹脂傳遞模塑）是一種液體復合材料制造工藝，由于其較低的模具成本和大型結構的制造優(yōu)勢，與其他工藝相比具有許多優(yōu)勢。在將樹脂灌注到包含VARTM工藝的預成型件的密閉模具中的過程中，樹脂流動通常受零件設計所導致的滲透性固有變化以及與模具鋪層相關的變化影響。當前用于VARTM的注入方法可提供；對模具內樹脂流動的控制非常有限：這可能導致零件缺陷，包括干燥（未填充）區(qū)域和空隙。迫切需要繼續(xù)提高零件質量，尤其是消除干點和空隙。似乎有幾種方法可以改善對樹脂流量的控制，包括開發(fā)多段樹脂注入線，以實時修改樹脂流動前沿。這項研究的總體目標是證明VARTM的實用控制策略，該策略可控制模具內的樹脂流動。此功能的潛在好處是巨大的。流量的控制將減少成品零件中空隙的存在，從而減少廢品的數量。當前的制造方法通過延長注射時間以促進模具完全浸入來最大程度地減少空隙的形成。更好地控制樹脂流量將減少對延長注入時間的需求，從而提高生產效率。 （摘要由UMI縮短。）

著錄項

  • 作者

    Nalla, Ajit R.;

  • 作者單位

    University of Delaware.;

  • 授予單位 University of Delaware.;
  • 學科 Engineering Mechanical.
  • 學位 M.S.M.E.
  • 年度 2006
  • 頁碼 89 p.
  • 總頁數 89
  • 原文格式 PDF
  • 正文語種 eng
  • 中圖分類 機械、儀表工業(yè);
  • 關鍵詞

相似文獻

  • 外文文獻
  • 中文文獻
  • 專利
獲取原文

客服郵箱：kefu@zhangqiaokeyan.com

京公網安備：11010802029741號 ICP備案號：京ICP備15016152號-6 六維聯合信息科技 (北京) 有限公司?版權所有

  • 客服微信

  • 服務號