舰炮抽壳系统非线性结构.doc
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舰炮抽壳系统非线性结构,摘要炮闩机构是舰炮的重要机构之一，其主要作用是闭锁炮膛、击发底火和抽出药筒。在某中口径舰炮实际工作过程中发现抽壳系统的动态特性是影响舰炮可靠性的重要因素。针对炮弹发射过程中抽壳系统存在的塑性变形和构件磨损问题，以及抽壳动作不能顺利完成现象，在结构动力学理论的基础上，结合有限元技术分别对药筒的抽壳力和抽壳系统的结构动力学...
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摘 要
炮闩机构是舰炮的重要机构之一，其主要作用是闭锁炮膛、击发底火和抽出药筒。在某中口径舰炮实际工作过程中发现抽壳系统的动态特性是影响舰炮可靠性的重要因素。针对炮弹发射过程中抽壳系统存在的塑性变形和构件磨损问题，以及抽壳动作不能顺利完成现象，在结构动力学理论的基础上，结合有限元技术分别对药筒的抽壳力和抽壳系统的结构动力学进行特性研究分析，并完成数值模拟。
本文主要研究内容有：
1) 在抽壳力的模拟中，首先阐述了炮弹发射和药筒抽出过程，进行了弹塑性力学分析，并探讨了影响抽壳力的因素；然后利用有限元软件ABAQUS对抽壳力进行数值模拟，并结合实验验证了方法的合理性和正确性，为药筒的改进设计提供了参考。
2) 对抽壳系统的结构动力学分析，论述了抽壳系统的结构及工作原理，应用三维软件PRO/E和有限元软件HyperMesh分别建立了某舰炮抽壳系统的实体模型和有限元分析模型；然后运用ABAQUS的显示算法对模型进行分析研究，揭示了抽壳系统结构的应力分布规律，比较了摇臂磨损前后抽壳系统的动态特性，探讨了磨损后对抽壳系统能量和抽壳速度的影响，并针对抽筒子的塑性变形对抽壳系统中的摇臂进行优化，解决了抽筒子塑性变形的问题，确定了摇臂的最佳厚度选择；最后通过实验验证了有限元分析模型的合理性和正确性。
通过实验和仿真分析相结合对舰炮抽壳系统的非线性结构动力学研究，为抽壳系统的研究提出了一种等效模型，为舰炮构件磨损分析提供一种研究方法，同时也为以后产品的改进设计提供理论和实践上的支持。
关键词 显式算法；数值模拟；塑性变形；抽壳系统
Abstract
The breech mechanism is one of the key mechanism of naval gun, which is vital for closed bore, percussion primer and extraction cartridge. In real work, the dynamic characteristics of extractor system were important factor affecting a naval gun’s reliability. Aiming at the problem, which system exist plastic deformation and component abrasion and extraction cartridge action can not be successfully completed after gun fired, on the basis of the theory of structural dynamics and combined with finite element technique, the extracting force and structural dynamics of extractor system were analyzed, the numerical analysis of extracting force were completed.
The main contents of this thesis:
1) In the simulation of extracting force, in the first place, gun fired and extraction process were described, the elastic-plastic mechanics analysis were done and influence factor of extracting force was discussed. Then, with ABAQUS, the numerical analysis of extracting force was performed and the correctness and rationality of method were verified by experiment, it based for dynamics analysis and provided reference for cartridge design.
2) In the analysis of structural dynamics of system, first, the working principle and structure of extractor system were explicate, the solid model and FEA model were build with PRO/E and HyperMesh. Secondly, the FEA model were analyzed by explicit algorithm of ABAQUS, the stress distribution law of system were revealed, the dynamic characteristics of system before and after abrasion were compared, the abrasion was influenced on the energy of system and velocity of extraction. Aiming at plastic deformation of extractor, rocker arm was optimized, the plastic deformation of extractor was resolved and the best thickness choice was confirmed. Finally, through the experiment, the correctness and rationality of method were verified.
Study on nonlinear structural dynamics study of system, which was based on experimental and simulation analysis, proposed an equivalent model for extracting cartridge case system, provided a research method for abrasion analysis of naval gun component and theoretical and practical support for future production improvements.
Keywords explicit algorithm, numerical analysis, plastic deformation, extractor system
目 录
摘 要 I
Abstract III
第1章 绪论 1
1.1 课题研究的背景及意义 1
1.2 国内外研究现状 3
1.2.1 火炮动力学 3
1.2.2 炮闩机构 4
1.3 本文主要研究内容及章节安排 5
1.3.1 主要研究内容 5
1.3.2 章节安排及论文结构框架 5
1.4 本章小结 6
第2章 非线性结构动力学分析理论 7
2.1 有限元法 7
2.1.1 有限元法的基本思想 7
2.1.2 有限元法分析的基本步骤 8
2.2 弹塑性力学理论 9
2.2.1 应变强化模式 9
2.2.2 受内压的厚壁圆筒理论 10
2.3结构动力学理论基础 11
2.3.1 结构动力学非线性有限元方程组的求解方法 11
2.3.2 阻尼模型 16
2.4 接触-碰撞理论 17
2.4.1 摩擦模型 18
2.4.2 ABAQUS中的接触-碰撞约束 19
2.5本章小结 20
第3章 基于弹塑性理论的抽壳力分析 21
3.1 舰炮炮弹发射与抽壳过程 21
3.2 弹塑性力学分析 22
3.2.1 药筒贴膛前的力学分析 22
3.2.2 药筒贴膛后到膛压达到最大阶段的力学分析 24
3.2.3 膛压下降阶段的力学分析 26
3.3 抽壳力影响因素的理论分析 27
3.4 抽壳力的数值模拟 30
3.4.1 建立有限元模型 30
3.4.2 材料定义 30
3.4.3 接触定义 31
3.4.4 载荷和边界条件 31
3.4.5 结果分析 32
3.5 抽壳力的实验验证 33
3.6本章小结 34
第4章 舰炮抽壳系统有限元模型建立 35
4.1 抽壳系统的工作原理 35
4.2抽壳系统实体模型 36
4.3抽壳系统有限元模型 36
4.3.1 网格划分 36
4.3.2 阻尼分析 37
4.3.3 抽壳系统各部件间的连接 38
4.3.4 载荷与边界条件 42
4.4 本章小结 42-..
炮闩机构是舰炮的重要机构之一，其主要作用是闭锁炮膛、击发底火和抽出药筒。在某中口径舰炮实际工作过程中发现抽壳系统的动态特性是影响舰炮可靠性的重要因素。针对炮弹发射过程中抽壳系统存在的塑性变形和构件磨损问题，以及抽壳动作不能顺利完成现象，在结构动力学理论的基础上，结合有限元技术分别对药筒的抽壳力和抽壳系统的结构动力学进行特性研究分析，并完成数值模拟。
本文主要研究内容有：
1) 在抽壳力的模拟中，首先阐述了炮弹发射和药筒抽出过程，进行了弹塑性力学分析，并探讨了影响抽壳力的因素；然后利用有限元软件ABAQUS对抽壳力进行数值模拟，并结合实验验证了方法的合理性和正确性，为药筒的改进设计提供了参考。
2) 对抽壳系统的结构动力学分析，论述了抽壳系统的结构及工作原理，应用三维软件PRO/E和有限元软件HyperMesh分别建立了某舰炮抽壳系统的实体模型和有限元分析模型；然后运用ABAQUS的显示算法对模型进行分析研究，揭示了抽壳系统结构的应力分布规律，比较了摇臂磨损前后抽壳系统的动态特性，探讨了磨损后对抽壳系统能量和抽壳速度的影响，并针对抽筒子的塑性变形对抽壳系统中的摇臂进行优化，解决了抽筒子塑性变形的问题，确定了摇臂的最佳厚度选择；最后通过实验验证了有限元分析模型的合理性和正确性。
通过实验和仿真分析相结合对舰炮抽壳系统的非线性结构动力学研究，为抽壳系统的研究提出了一种等效模型，为舰炮构件磨损分析提供一种研究方法，同时也为以后产品的改进设计提供理论和实践上的支持。
关键词 显式算法；数值模拟；塑性变形；抽壳系统
Abstract
The breech mechanism is one of the key mechanism of naval gun, which is vital for closed bore, percussion primer and extraction cartridge. In real work, the dynamic characteristics of extractor system were important factor affecting a naval gun’s reliability. Aiming at the problem, which system exist plastic deformation and component abrasion and extraction cartridge action can not be successfully completed after gun fired, on the basis of the theory of structural dynamics and combined with finite element technique, the extracting force and structural dynamics of extractor system were analyzed, the numerical analysis of extracting force were completed.
The main contents of this thesis:
1) In the simulation of extracting force, in the first place, gun fired and extraction process were described, the elastic-plastic mechanics analysis were done and influence factor of extracting force was discussed. Then, with ABAQUS, the numerical analysis of extracting force was performed and the correctness and rationality of method were verified by experiment, it based for dynamics analysis and provided reference for cartridge design.
2) In the analysis of structural dynamics of system, first, the working principle and structure of extractor system were explicate, the solid model and FEA model were build with PRO/E and HyperMesh. Secondly, the FEA model were analyzed by explicit algorithm of ABAQUS, the stress distribution law of system were revealed, the dynamic characteristics of system before and after abrasion were compared, the abrasion was influenced on the energy of system and velocity of extraction. Aiming at plastic deformation of extractor, rocker arm was optimized, the plastic deformation of extractor was resolved and the best thickness choice was confirmed. Finally, through the experiment, the correctness and rationality of method were verified.
Study on nonlinear structural dynamics study of system, which was based on experimental and simulation analysis, proposed an equivalent model for extracting cartridge case system, provided a research method for abrasion analysis of naval gun component and theoretical and practical support for future production improvements.
Keywords explicit algorithm, numerical analysis, plastic deformation, extractor system
目 录
摘 要 I
Abstract III
第1章 绪论 1
1.1 课题研究的背景及意义 1
1.2 国内外研究现状 3
1.2.1 火炮动力学 3
1.2.2 炮闩机构 4
1.3 本文主要研究内容及章节安排 5
1.3.1 主要研究内容 5
1.3.2 章节安排及论文结构框架 5
1.4 本章小结 6
第2章 非线性结构动力学分析理论 7
2.1 有限元法 7
2.1.1 有限元法的基本思想 7
2.1.2 有限元法分析的基本步骤 8
2.2 弹塑性力学理论 9
2.2.1 应变强化模式 9
2.2.2 受内压的厚壁圆筒理论 10
2.3结构动力学理论基础 11
2.3.1 结构动力学非线性有限元方程组的求解方法 11
2.3.2 阻尼模型 16
2.4 接触-碰撞理论 17
2.4.1 摩擦模型 18
2.4.2 ABAQUS中的接触-碰撞约束 19
2.5本章小结 20
第3章 基于弹塑性理论的抽壳力分析 21
3.1 舰炮炮弹发射与抽壳过程 21
3.2 弹塑性力学分析 22
3.2.1 药筒贴膛前的力学分析 22
3.2.2 药筒贴膛后到膛压达到最大阶段的力学分析 24
3.2.3 膛压下降阶段的力学分析 26
3.3 抽壳力影响因素的理论分析 27
3.4 抽壳力的数值模拟 30
3.4.1 建立有限元模型 30
3.4.2 材料定义 30
3.4.3 接触定义 31
3.4.4 载荷和边界条件 31
3.4.5 结果分析 32
3.5 抽壳力的实验验证 33
3.6本章小结 34
第4章 舰炮抽壳系统有限元模型建立 35
4.1 抽壳系统的工作原理 35
4.2抽壳系统实体模型 36
4.3抽壳系统有限元模型 36
4.3.1 网格划分 36
4.3.2 阻尼分析 37
4.3.3 抽壳系统各部件间的连接 38
4.3.4 载荷与边界条件 42
4.4 本章小结 42-..
