复杂机械结构模糊有限元优化

运用模糊数学和有限元理论,以哈尔滨锅炉厂生产的全量型安全阀阀体为例,进行复杂机械结构的设计分析和模糊优化.基于VC.NET平台及ANSYS提供的APDL语言,开发虚拟环境下的阀体模糊有限元结构设计的主模型,对于复杂、难于掌握的ANSYS命令流进行后台封装,大大减小了复杂机械结构模糊优化分析的工作量.在满足密封性和强度的工程要求下,经过12次迭代运算,阀体结构质量下降了17.5%.对比优化及模糊优化的各参数值表明,采用模糊优化能够使阀体结构在一定刚度范围内密封性提升及中心轴线的偏移量减小,结构形式和尺寸更合理.

Fuzzy finite element optimization of complicated mechanical structure

According to the principles of fuzzy mathematics and finite element,the paper focuses on analysis and fuzzy optimal design of complicated mechanical structure by an example of the valve body of full-bore type safety valve manufactured by Harbin HBC Valve Company Limited.The main model of valve body designed by fuzzy finite element is developed under virtual environment by using VC.NET platform and APDL provided by ANSYS.The complicated and indigestible ANSYS command stream is encapsulated in background process.So the system can largely reduce the valve body study and design workload.With the satisfaction of the sealing capability and intensity under engineering requirements,through 12 times of iterative computation,the weight of the object is reduced by 17.50%.It is concluded that fuzzy optimization can improve the sealing capability and reduce the offset of center axis on the basis of structural rigidity in a certain range for the valve body.So the structure and dimension are more reasonable.