| 1. | 4 ) the method for rapid implementation of parameterized modeling of geometry and finite element of structure through a universal cae software ( msc . patran ) is researched , and parameterized modeling of the obturator of the breech mechanism is accomplished using the method
研究了在通用cae软件( msc . patran )环境下，快速实施结构几何和有限元参数化建模的方法，并对炮闩闭气结构实施了参数化建模。 |
| 2. | 5 ) the 3 - d geometry and finite element model of the assembly of the optimized obturator of the breech mechanism is set up in terms of the optimized structural parameters . quasi - static and dynamic finite element analysis of stiffness , strength and obturating performance of the optimized obturator of the breech me chanism is performed
利用优化后的结构参数建立了优化后炮闩闭气结构的装配体三维几何实体模型和有限元模型，对优化后的炮闩闭气结构刚强度和闭气性能进行了准静态及动态多体接触弹塑性有限元分析。 |
| 3. | Application of structural optimization and nonlinear finite element technique to nonlinear multi - component structural system ( assembly ) is studied for the sake of the obturator of the breech mechanism of an automated mortar . the method and technology for optimizing nonlinear multi - component structural system with contact is mainly researched in this thesis
以某自动迫击炮炮闩闭气结构为背景，对结构优化与非线性有限元技术在多构件非线性结构(装配体)系统中的应用进行研究，着重在对存在接触关系的多构件非线性结构系统进行优化设计的方法和技术途径方面进行了研究和探索。 |
| 4. | 3 ) a 3 - d geometry and finite element model of the assembly of the obturator of the breech mechanism is established . quasi - static and dynamic finite element analysis of stiffness , strength and obturating performance of the obturator of the breech mechanism is carried out , based on elastoplastic theory and multi - body contact algorithm , and the simulation results coincide with experimental results , further , th e effect of friction factor on its obturating performance is investigated
建立了炮闩闭气结构的三维装配体几何实体模型和有限元模型，对炮闩闭气结构刚强度和闭气性能进行了准静态及动态多体接触弹塑性有限元分析，分析结果与试验结果相吻合，进一步研究了摩擦系数对其闭气性能的影响。 |
| 5. | Graphical user interfaces are developed to be convenient for implementing of parameterized model and debugging of program parameters . program of optimization based on ga is designed to optimize obturating performance of the obturator of the breech mechanism , further , the effect of control parameters of ga and friction factor on the optimal structure is studied
开发了实施参数化建模和程序参数调试的界面，编制了遗传算法优化程序，对炮闩闭气结构进行了闭气性能优化，并研究了遗传算法运行的控制参数对优化结果的影响以及摩擦系数对最优结构形式的影响。 |
| 6. | Success in optimizing the obturating performance of the obturator of the breech mechanism shows that the method and technology for optimal design of nonlinear multi - component structural system with contact put forward in this thesis is effective and practical . structural optimization problems that are difficult to solve through the optimization method available in the universal cae software can be accomplished by means of this method
对炮闩闭气结构闭气性能优化的成功说明了本文提出的对存在接触关系的多构件非线性结构(装配体)系统进行优化设计的方法和技术途径具有实用价值，可以解决在通用cae软件中现有优化算法难以解决的结构优化问题。 |
| 7. | Comparison of stiffness , strength and obturating performance of the initial obturator of the breech mechanism with those of the optimized one is made , which indicates that the stress concentration that leads to fatigue failure in the optimized structure is eliminated . the flexibility of the optimized obturator of the breech mechanism is considerably increased and its obturating performance is substantially improved
对优化前后炮闩闭气结构刚强度和闭气性能进行了对比，优化后的结构应力集中问题得到了有效控制，消除了潜在的疲劳源，结构的柔性得到很大程度的提高，闭气性能有了明显改善，实现了优化的目的。 |
