航空电气系统绝缘故障的研究

作者： 杨立树   来源： 大连理工大学 年份： 2016 文献类型 ： 学位论文 关键词： 航空   电缆老化   绝缘   故障电弧   仿真  

描述： 以至绝缘损坏是产生故障电弧的主要原因,因此本文对航空电气系统绝缘问题的研究主要集中于两点:一是对航空故障电弧进行仿真研究,另一方面是对航空电缆绝缘老化进行试验研究。对航空故障电弧进行分析研究,目的是

航空电气系统绝缘故障的研究

作者： 杨立树   来源： 大连理工大学 年份： 2016 文献类型 ： 学位论文 关键词： 航空   电缆老化   绝缘   故障电弧   仿真  

描述： 以至绝缘损坏是产生故障电弧的主要原因,因此本文对航空电气系统绝缘问题的研究主要集中于两点:一是对航空故障电弧进行仿真研究,另一方面是对航空电缆绝缘老化进行试验研究。对航空故障电弧进行分析研究,目的是

航空故障电弧检测技术的研究

作者： 吴建建   来源： 大连理工大学 年份： 2016 文献类型 ： 学位论文 关键词： 航空   小波变换   故障电弧断路器   故障电弧   仿真  

描述： 随着航空事业的发展,航空安全问题越来越受到人们的关注。航空电缆由于温度、辐射及振动等因素的影响,会逐渐老化产生细小裂纹,由此造成的航空电缆绝缘故障可能会导致断续的电弧产生,从而引发飞行故障甚至空难

航空故障电弧检测技术的研究

作者： 吴建建   来源： 大连理工大学 年份： 2016 文献类型 ： 学位论文 关键词： 航空   小波变换   故障电弧断路器   故障电弧   仿真  

描述： 随着航空事业的发展,航空安全问题越来越受到人们的关注。航空电缆由于温度、辐射及振动等因素的影响,会逐渐老化产生细小裂纹,由此造成的航空电缆绝缘故障可能会导致断续的电弧产生,从而引发飞行故障甚至空难

人力派遣关键成功因素之探索性研究－一以对台湾航空产业为例

作者： 邱创增   来源： 国立台湾科技大学 年份： 2016 文献类型 ： 学位论文 关键词： 航空  

描述： 研究以人力派遣對於成功因素為例，以訪談調查及資料收集法，透過資料分析整理，歸納出人力派遣運用於台灣航空維修產業之關鍵成功因素。

人力派遣关键成功因素之探索性研究－一以对台湾航空产业为例

作者： 邱创增   来源： 国立台湾科技大学 年份： 2016 文献类型 ： 学位论文 关键词： 航空  

描述： 研究以人力派遣對於成功因素為例，以訪談調查及資料收集法，透過資料分析整理，歸納出人力派遣運用於台灣航空維修產業之關鍵成功因素。

航空发动机零部件焊接过程仿真

作者： 唐心武   来源： 北京航空航天大学 年份： 2016 文献类型 ： 学位论文 关键词： 焊接   仿真  

描述： Welds are often an essential part of aero space engineering structures. Residual stresses introduced in the welded regions, due to the nonlinear thermal processes during welding, can have detrimental effects, such as stress corrosion cracking, hydrogen-induced cracking and reduced fatigue strength. It is therefore pertinent to simulate the process of welding to predict the behaviour of welded structures from finite element residual stress and deformation result. The base metal is Nickel based-supper alloy (INCONEL Alloy 718) of thin combustion chamber outer casing (CCOC). The simulations are performed with the commercial software SYSWELD+, which includes moving heat sources, material deposit, metallurgical properties, metal plasticity and elasticity, transient heat transfer and mechanical analyses. One-way thermo-mechanical coupling is assumed, which means that the thermal analysis is completed first, followed by a separate mechanical analysis based on the thermal history.This paper introduces finite element methods for the modeling of welds and it depicts a brief history of the simulation of welds. The processes, procedures, and metallurgy of gas-metal arc welding of nickel based alloy are presented in Chapter 2. In Chapter 3, the previous finite element analyses of welding are reviewed. The energy and constitutive equations governing a welding simulation are outlined in Chapter 4, while performing welding simulations utilizing the SYSWELD+ software is described in Chapter 5. The residual stress results for outer combustion casing are reported in Chapter6. The conclusion is described in chapter 7.Welding simulations to predict residual stress states require three-dimensional analysis in the vicinity of the joint and these analyses are computationally intensive and difficult. Although the state of the art in welding simulations using finite elements is improve as an advanced method.

航空发动机零部件焊接过程仿真

作者： 唐心武   来源： 北京航空航天大学 年份： 2016 文献类型 ： 学位论文 关键词： 焊接   仿真  

描述： Welds are often an essential part of aero space engineering structures. Residual stresses introduced in the welded regions, due to the nonlinear thermal processes during welding, can have detrimental effects, such as stress corrosion cracking, hydrogen-induced cracking and reduced fatigue strength. It is therefore pertinent to simulate the process of welding to predict the behaviour of welded structures from finite element residual stress and deformation result. The base metal is Nickel based-supper alloy (INCONEL Alloy 718) of thin combustion chamber outer casing (CCOC). The simulations are performed with the commercial software SYSWELD+, which includes moving heat sources, material deposit, metallurgical properties, metal plasticity and elasticity, transient heat transfer and mechanical analyses. One-way thermo-mechanical coupling is assumed, which means that the thermal analysis is completed first, followed by a separate mechanical analysis based on the thermal history.This paper introduces finite element methods for the modeling of welds and it depicts a brief history of the simulation of welds. The processes, procedures, and metallurgy of gas-metal arc welding of nickel based alloy are presented in Chapter 2. In Chapter 3, the previous finite element analyses of welding are reviewed. The energy and constitutive equations governing a welding simulation are outlined in Chapter 4, while performing welding simulations utilizing the SYSWELD+ software is described in Chapter 5. The residual stress results for outer combustion casing are reported in Chapter6. The conclusion is described in chapter 7.Welding simulations to predict residual stress states require three-dimensional analysis in the vicinity of the joint and these analyses are computationally intensive and difficult. Although the state of the art in welding simulations using finite elements is improve as an advanced method.

飞机起落架建模理论和仿真方法的研究

作者： 张国健   来源： 沈阳工业大学 年份： 2022 文献类型 ： 学位论文 关键词： AMESim   优化   仿真   飞机缓冲器  

描述： 飞机起落架建模理论和仿真方法的研究

飞机起落架建模理论和仿真方法的研究

作者： 张国健   来源： 沈阳工业大学 年份： 2022 文献类型 ： 学位论文 关键词： AMESim   优化   仿真   飞机缓冲器  

描述： 飞机起落架建模理论和仿真方法的研究