ass日本风韵熟妇pics男人扒开女人屁屁桶到爽|扒开胸露出奶头亲吻视频|邻居少妇的诱惑|人人妻在线播放|日日摸夜夜摸狠狠摸婷婷|制服 丝袜 人妻|激情熟妇中文字幕|看黄色欧美特一级|日本av人妻系列|高潮对白av,丰满岳妇乱熟妇之荡,日本丰满熟妇乱又伦,日韩欧美一区二区三区在线

考慮全局應(yīng)力約束的大變形柔順機(jī)構(gòu)拓?fù)錁?gòu)型設(shè)計
CSTR:
作者:
作者單位:

作者簡介:

通訊作者:

中圖分類號:

基金項目:

國家自然科學(xué)基金項目(51665011,、52065019)和江西省自然科學(xué)基金項目(20202BAB204015,、20202ACBL214013、20192BAB21602)


Topological Design of Large-displacement Compliant Mechanisms Considering Global Stress Constraints
Author:
Affiliation:

Fund Project:

  • 摘要
  • |
  • 圖/表
  • |
  • 訪問統(tǒng)計
  • |
  • 參考文獻(xiàn)
  • |
  • 相似文獻(xiàn)
  • |
  • 引證文獻(xiàn)
  • |
  • 資源附件
  • |
  • 文章評論
    摘要:

    為了避免大變形引起靜強(qiáng)度失效,,提出一種考慮全局應(yīng)力約束的大變形柔順機(jī)構(gòu)拓?fù)鋬?yōu)化設(shè)計方法,。采用Total-Lagrangian描述方法和增量式Newton-Raphson法求解機(jī)構(gòu)的大變形響應(yīng)問題;采用基于假設(shè)密度場的單元勢能插值法,,從而避免幾何非線性拓?fù)鋬?yōu)化出現(xiàn)的數(shù)值不收斂問題,;以輸出位移最大化作為優(yōu)化目標(biāo),采用改進(jìn)的P范數(shù)將機(jī)構(gòu)所有單元局部應(yīng)力約束轉(zhuǎn)換為一個全局應(yīng)力約束,,構(gòu)建考慮全局應(yīng)力約束的柔順機(jī)構(gòu)幾何非線性拓?fù)鋬?yōu)化模型,,采用移動漸近線算法求解優(yōu)化問題。數(shù)值算例結(jié)果表明,,采用本文方法獲得的大變形柔順機(jī)構(gòu)能夠有效滿足應(yīng)力約束,。隨著允許應(yīng)力約束值的減小,機(jī)構(gòu)構(gòu)型中的鉸鏈區(qū)域逐漸擴(kuò)大,,使機(jī)構(gòu)的柔度分布更加均勻,,但是輸出位移逐漸減小。

    Abstract:

    To avoid static strength failure caused by large deflection, a design method for topology optimization of large-displacement compliant mechanisms considering global stress constraints was proposed. The Total-Lagrangian formulation and the incremental Newton-Raphson method were applied to solve the geometrically nonlinear response of the mechanisms. The element energy interpolation scheme for fictitious domain techniques was adopted to circumvent the non-convergence problem in the topology optimization of geometrical nonlinear problems. The maximum of the output displacement of the compliant mechanisms was developed as the optimization objective. The local stresses constraints for all elements were aggregated into a global stress constraint using the improved P-norm method. The optimization model for topology optimization of compliant mechanism with geometrical nonlinearities considering global stress constraints was established. The method of moving asymptotes was applied to solve the topology optimization problem for the design of large-displacement compliant mechanisms with global stress constraints. The results of numerical examples showed that large-displacement compliant mechanisms obtained by topology optimization with global stress constraint can effectively satisfy the stress constraints. As the allowable stress limit was decreased, the hinge area in the compliant mechanism configurations was gradually elongated, which can make the compliance of the mechanisms be more uniformly distributed. However, the output displacement of the mechanisms was gradually decreased.

    參考文獻(xiàn)
    相似文獻(xiàn)
    引證文獻(xiàn)
引用本文

占金青,彭怡平,羅震,劉敏.考慮全局應(yīng)力約束的大變形柔順機(jī)構(gòu)拓?fù)錁?gòu)型設(shè)計[J].農(nóng)業(yè)機(jī)械學(xué)報,2021,52(2):408-415. ZHAN Jinqing, PENG Yiping, LUO Zhen, LIU Min. Topological Design of Large-displacement Compliant Mechanisms Considering Global Stress Constraints[J]. Transactions of the Chinese Society for Agricultural Machinery,2021,52(2):408-415.

復(fù)制
分享
文章指標(biāo)
  • 點擊次數(shù):
  • 下載次數(shù):
  • HTML閱讀次數(shù):
  • 引用次數(shù):
歷史
  • 收稿日期:2020-10-10
  • 最后修改日期:
  • 錄用日期:
  • 在線發(fā)布日期: 2021-02-10
  • 出版日期: 2021-02-10
文章二維碼