机械结构组合对称概念体系及应用

Concept system and application of mechanical structure combination symmetry

为了将结构组合对称思想应用于机械创新设计,从对称主体、对称基准角度对机械实例结构进行分解.分析机械实例中多对称主体和基准之间的关系,建立包含单层和多层、串联和并联等关系的机械结构组合对称概念体系.借鉴群论的符号表达,建立机械结构组合对称的符号表示体系和实例表达模型.利用已有机械结构组合对称设计平台,运用Eclat算法,挖掘和提炼机械结构单层组合、多层串、并联组合对称设计应用知识.针对现有机械泵输出流量周期性波动问题,应用组合对称设计知识,发明了四腔体并联组合对称叶片泵.得益于该组合对称设计结构,四腔体周期性波动相互抵消,瞬时扫掠总面积恒定,因而泵输出流量稳定.

The structures of mechanical instances were decomposed from the perspective of symmetry subject and reference in order to apply the idea of structure combination symmetry in the process of mechanical innovation design.Relationships among these multi-symmetry subjects and multi-symmetry references within mechanical instance were analyzed. The concept system of mechanical structure combination symmetry was established,which includes single-level, multi-level,series and parallel combining relations.The symbolic expression system and instance expression model of mechanical combination symmetry were proposed referring to the symbols used in group theory.The design application knowledge of mechanical structure with single-level combination symmetry and multi-level in series and parallel combination symmetry were data mined and extracted by employing Eclat algorithm in the existing design platform of mechanical structure combination symmetry.The combination symmetry knowledge was employed to design a new vane pump with four chambers which were symmetrically combined and parallel connected in order to solve the periodic fluctuation problem of the output flow of existing mechanic pumps.The periodic fluctuations of the output flows of four chambers were cancelled out,and the total instant sweeping area was invariable benefiting from the very structurally combined symmetry design.The output flow of the designed pump was stable.