基于混合推理的汽轮机叶片夹具自顶向下设计方法  

Design method of turbine blade fixture from top to bottom based on hybrid reasoning

作　　者：沈子恒 吕彦明 袁飞 赵鹏 方文湛 SHEN Zi-heng;LV Yan-ming;YUAN Fei;ZHAO Peng;FANG Wen-zhan(Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology,Jiangnan University,Wuxi 214122,China)

机构地区：[1]江南大学江苏省食品先进制造装备技术重点实验室,江苏无锡214122

出　　处：《机电工程》2021年第6期780-786,共7页Journal of Mechanical & Electrical Engineering

基　　金：国家重点新产品开发计划资助项目(2010GRC10021);江苏省重大科技成果转化资助项目(BA2009028)。

摘　　要：针对传统的设计方法存在设计效率低下、产品开发周期长以及工程设计人员工作强度大等问题,通过对汽轮机叶片夹具设计特征的研究,提出了一种基于规则和实例混合推理的夹具自顶向下设计方法。首先,建立了叶片夹具的系列化和参数化零件,对各零件进行装配约束和参数关联,构建了夹具实例库;依据Top-Down设计思想,基于夹具实例编码系统,提出了对首要因素加权平均的相似度计算方法,检索并重用相似夹具实例;根据具体叶片以及强度、刚度等需要对其进行了修改,根据U103夹具的功能信息,检索得到了符合要求的夹具;最后,根据叶片以及强度、刚度等对夹具进行了有限的人工干预,生成了自顶向下驱动符合叶片U103夹具功能要求的新夹具。研究结果表明:基于混合推理的汽轮机叶片夹具自顶向下设计可显著提高夹具的设计效率,简化其工作复杂程度。Aiming at the traditional design methods,there were some prominent problems,such as low design efficiency,long product development cycle and high work intensity of engineering designers,with the study of the design characteristics of turbine blade fixture,a Top-Down design method based on rule and case hybrid reasoning was proposed.Firstly,the serialized and parameterized parts of the blade fixture were established,the assembly constraints and parameter associations of each part were carried out,and the fixture instance library was constructed.Based on the top-down design idea and the fixture instance coding system,a similarity calculation method for the weighted average of the primary factors was proposed,and similar fixture instances were retrieved and reused.Finally,according to the needs of blades,strength and stiffness,etc.,limited manual intervention was carried out on the clamps,and the new clamps that meet the functional requirements of U103 clamps were driven from the top down to generate.The results show that the Top-Down design of turbine blade fixture based on hybrid reasoning significantly improves the design efficiency,simplifies the complexity of the work.

关 键 词：汽轮机叶片 夹具 自顶向下 混合推理 UG二次开发 

分 类 号：TH122[机械工程—机械设计及理论] TG754[金属学及工艺—刀具与模具]