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- 某航空发动机径向扩压器叶片断裂分析
- 作者： 关婷婷 李伟超 武威 薛雨洲 尚怀远 杨璠 来源： 燃气轮机技术 年份： 2024 文献类型 ： 期刊 关键词： 叶片断裂 共振 坎贝尔图 径向扩压器 故障分析 高周疲劳
- 描述： 扩压器叶片断裂性质为高周疲劳断裂，产生高周疲劳的原因为径向扩压器在发动机工作转速范围内存在共振。径向扩压器共振时振动应力的大应力区在叶片前缘叶根处，导致叶片从该处产生裂纹，最终发生高周疲劳断裂。建议优化径向扩压器叶片叶型，避开工作转速范围内的共振，以避免类似故障重复发生。
- 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.
- 航空发动机外部管路支架断裂分析及优化
- 作者： 崔向敏 潘冬 彭楠 马健 来源： 燃气涡轮试验与研究 年份： 2021 文献类型 ： 期刊 关键词： 航空发动机 振动应力 支架改进 断口分析 支架断裂 结构 外部管路 高周疲劳
- 描述： 、装配应力及加工质量不符合要求综合所致。据此,提出两种支架改进方案,并通过建立有限元模型,分别进行了相同振动幅值和相同激振力下的强度对比分析。结果显示,通过增加支架厚度和宽度提高支架高周疲劳强度储备可以有效避免该故障的发生,且改进后的支架抗振能力大幅提高。经后续试验验证,支架断裂故障得以排除。
- 航空发动机外部管路支架断裂分析及优化
- 作者： 崔向敏 潘冬 彭楠 马健 来源： 燃气涡轮试验与研究 年份： 2021 文献类型 ： 期刊 关键词： 航空发动机 振动应力 支架改进 断口分析 支架断裂 结构 外部管路 高周疲劳
- 描述： 、装配应力及加工质量不符合要求综合所致。据此,提出两种支架改进方案,并通过建立有限元模型,分别进行了相同振动幅值和相同激振力下的强度对比分析。结果显示,通过增加支架厚度和宽度提高支架高周疲劳强度储备可以有效避免该故障的发生,且改进后的支架抗振能力大幅提高。经后续试验验证,支架断裂故障得以排除。
- 某航空发动机卡箍断裂故障分析
- 作者： 刘中华 贾铎 刘鑫 来源： 航空发动机 年份： 2019 文献类型 ： 期刊 关键词： 风扇机匣 航空发动机 振动 卡箍 故障分析 断裂 结构强度 高周疲劳
- 描述： 螺栓拧紧过程中,造成卡箍结构故障位置产生较大的初始局部应力,在较大的振动环境下导致综合应力增大,由于故障位置结构强度储备不足,从而发生高周疲劳断裂。通过对卡箍结构采取加装2 mm厚钢垫、降低静应力等改进措施优化设计,降低了其静应力,提高了其强度储备,有效避免此类故障再次发生。
- 舰载无人机弹射杆操纵系统设计与仿真
- 作者： 张晓娟 何泳 王山 史金辉 来源： 液压与气动 年份： 2020 文献类型 ： 期刊 关键词： 舰载无人机 泄漏 仿真 弹射杆操纵系统
- 描述： 液压源及弹射杆收放系统仿真模型,模拟了无人机机上往复车对弹射杆施加的载荷,对系统功能和性能进行了仿真,分析了泄漏对弹射杆收放性能的影响,通过仿真验证弹射杆收放过程的平稳性及快速性,系统设计合理有效,满足设计要求。