...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Aerospace science and technology >Study on unsaturated shapes of helium ballonet of rigid airship during ascent process
【24h】

Study on unsaturated shapes of helium ballonet of rigid airship during ascent process

机译：上升过程中刚性飞艇氦气气球的不饱和形状研究

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Airship has a good application prospect in tourism, material transportation, emergency rescue, communication relay, early warning, environmental protection and other fields. Airships can be classified into non-rigid types, semi-rigid types and rigid types. The rigid airship relies on the external skeleton to maintain its overall stiffness and shape, and the internal helium ballonet provides buoyancy. The helium ballonet is always in unsaturated state during ascent process, which will affect the center of gravity and buoyancy and the stress in wrinkle area, so it is great significance to study the unsaturated shape of the helium ballonet during ascent process. In this paper, the principal stress-principal strain principal is used to judge the stress state of the membrane. The modified constitutive matrix method and the pressure gradient method are used to obtain the shape of the helium ballonet under different saturation by the dynamic explicit FEM (Finite Element Method). When the pressure gradient method is used to apply the pressure difference internal and external of the ballonet, the change of unsaturated shape of the ballonet can be interpreted as the change of zero pressure level of the ballonet. The modified constitutive matrix method can effectively avoid the problem of non-convergence in the process of programming. The simulation results are in good agreement with the experimental results, which shows that the analysis method is reasonable and correct. (C) 2021 Elsevier Masson SAS. All rights reserved.
机译：飞艇在旅游，物质运输，应急救援，通信继电器，预警，环保等领域具有良好的应用前景。飞艇可分为非刚性类型，半刚性类型和刚性类型。刚性飞艇依赖于外部骨架，以保持其整体刚度和形状，内部氦气弹簧提供浮力。在上升过程中，氦气球始终处于不饱和状态，这将影响重心和浮力和皱纹区域的应力，因此在上升过程中研究氦气球的不饱和形状是重要的。在本文中，主要应力 - 主应变原理用于判断膜的应力状态。通过动态显式FEM（有限元方法），改进的构成矩阵法和压力梯度法在不同饱和下的不同饱和度下获得氦气弹簧的形状。当使用压力梯度法施加气球的内部和外部的压力差，弹性的不饱和形状的变化可以被解释为弹性零压力水平的变化。修改的本构矩阵方法可以有效地避免了在编程过程中的非收敛问题。仿真结果与实验结果吻合良好，表明分析方法合理且正确。 （c）2021 Elsevier Masson SAS。版权所有。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号