【摘要】 提出了一种复杂结构零件的逆向测量规划技术。基于功能-结构的层次映射,研究了复杂结构零件的元特征解耦机理,提取基本测量单元。构建包含精度特性、特征复杂度等元特征属性的信息模型及包含测量精度等的测量方法信息模型。建立元特征和测量方法匹配评价影响因素集,研究特征属性的关系模型。在此基础上,通过定性评价和模糊定量评价两个步骤得到匹配优度量化值,实现了测量方法的定量化最优选择。然后,对分散的元特征进行组合,优化整个测量过程。最后,采用此方法对汽车发动机气缸盖进行了快速逆向测量,并重构了计算机辅助设计模型。实验结果表明,该方法可以提高复杂结构零件的逆向设计效率与质量。更多还原

【Abstract】 A novel reverse measurement scheme method for complex structural components was presented.Based on studies of function-structure hierarchical mapping,a meta-feature decoupling method was presented to extract basic measurement elements.Information model for meta-features’ attributes were constructed which including accuracy feature,feature complicatedness,and information model for measurement method which including measurement accuracy was also set up.Influencing factors set of the matching quality was then constructed and relationships of these attributes were also studied.Based on fuzzy synthetic method,the optimal method for the measurement of each meta-feature was selected through both qualitative and quantitative analysis.To optimize the whole measurement process,the discrete meta-features were assembled.Finally,the proposed method was applied in the measurement of an automobile engine cylinder head and reconstruction of its geometry model.Experimental results showed that this method could improve the efficiency and quality in reverse design.更多还原