【作者】 覃伟平；

【导师】 王乘；

【作者基本信息】 华中科技大学 ， 水利水电工程， 2007， 硕士

【摘要】 袋式除尘器本体结构可靠性设计是其安全运行的重要保障。因此开展袋式除尘器本体结构热力耦合有限元仿真计算,得到其不同工况下的应力应变状态,实现除尘器结构优化设计,具有重要的工程意义。为了将花板结构转换为等效的均匀板以便简化结构设计与计算,本文结合均匀化方法与有限元法,采用单胞法分析了周期性分布、含圆孔袋式除尘器花板的有效力学性质,研究了花板圆孔半径和圆孔中心距对花板有效弹性常数的影响规律。在此基础上,对某大型袋式除尘器结构进行了不同工况下的热力耦合有限元仿真分析,分析了在热力耦合下除尘器的强度、刚度和稳定性,研究了运行温度和运行负压对除尘器强度的影响,通过反算得到了除尘器的最佳载荷工况。最后以型钢截面为设计变量,以除尘器的强度、刚度和稳定性为约束条件,以除尘器的总重为目标函数,基于遗传算法对除尘器进行结构优化设计,方便、快速地实现了除尘器结构的离散变量优化。更多还原

【Abstract】 The structural design of the great Bag Filter is an important indicator to guarantee its working reliability. Also the simulative computation analysis of the structure of the Bag Filter based on Finite Element Method proved itself an effective avenue in analyzing the intensity, rigidity as well as the stability under various working conditions, which would be of instructional significance in engineering projects.In order to simplify the design and the simulation, the structure is substituted with equivalent uniform board in the thesis, and then the homogenization method and the finite element method is combined, and the effective mechanical properties of the periodically distributed circular holes are analyzed, and the influence of the radius and center distance of tubesheet holes on the effective mechanical properties are investigated respectively. Subsequently the thermo-mechanic coupled finite analysis of the structure of a great Bag Filter under various working load is carried out to analyze the influence of the working temperature and load on the strength of the Filter. Moreover, a reverse simulation is performed to achieve the best working load. Finally, the finite element model has been developed to implement the structure optimization design with discrete variables of bag filter based on the genetic algorithm. The algorithm treats the steel section as design variables and the total weight as the objective function. The restrain conditions such as strength, rigidity and stability are considered. The results show that the GA method is effective and feasible.更多还原