CAJ | 학술논문

针对现阶段复杂结构零件在反求方案规划方面的不足,提出一种基于多种反求方法集成的测量过程规划技术.从功能需求出发并结合功能-结构-特征映射原理构建复杂零件的元特征解耦模型,提取元特征作为基本测量单元;进而利用模糊数学方法对元特征与测量方法之间的匹配优度进行评价,决策出单个元特征的最佳测量方法;结合方位面理论,研究了用于描述零件元特征总体分布特性的特征状态空间与描述测量方法有效范围的设备状态空间的定义方法:以设备状态空间为参照,通过特征状态空间的分解与重组,对最优测量方法相同的元特征集合进行划分,从而获得待测零件每次定位后可同时测量的元特征测量组:在此基础上,构建元特征组合测量方案综合评价模型,实现元特征测量的组合优化.对一款直列四缸汽车发动机气缸盖实施测量,并重构CAD模型.试验结果表明:该方法可有效提高复杂结构零件的逆向测量效率与质量.
침대현계단복잡결구령건재반구방안규화방면적불족,제출일충기우다충반구방법집성적측량과정규화기술.종공능수구출발병결합공능-결구-특정영사원리구건복잡령건적원특정해우모형,제취원특정작위기본측량단원;진이이용모호수학방법대원특정여측량방법지간적필배우도진행평개,결책출단개원특정적최가측량방법;결합방위면이론,연구료용우묘술령건원특정총체분포특성적특정상태공간여묘술측량방법유효범위적설비상태공간적정의방법:이설비상태공간위삼조,통과특정상태공간적분해여중조,대최우측량방법상동적원특정집합진행화분,종이획득대측령건매차정위후가동시측량적원특정측량조:재차기출상,구건원특정조합측량방안종합평개모형,실현원특정측량적조합우화.대일관직렬사항기차발동궤기항개실시측량,병중구CAD모형.시험결과표명:해방법가유효제고복잡결구령건적역향측량효솔여질량.
A planning model based on the integration of multi-RE is proposed in view of the existing deficiency in measurement process for complex structural components. In this approach, a meta feature decoupling is performed by mapping the functions to structures layer by layer, and the meta features are extracted as the basic units for further measurement. Based on the fuzzy mathematics methodology, an evaluation for the optimal matching degree is conducted to decide the best measuring method for each kind of meta feature. Combined with the azimuth theory, two defining methods are studied to describe the feature state space of the overall distribution characteristics of meta features and the equipment state space of the effective measuring range respectively. By taking the equipment state space as the reference, the meta feature set in which all the members can be measured after the positioning of the target component can be decided through the decomposition and reorganization for the feature state space. Based on these, a comprehensive evaluation model for meta feature compound measurement is developed to realize the optimization of the measurement process. This method is verified through a case study on a cylinder head of inline4 engine and the CAD model is reconstructed. The results indicate that this method is effective for improving the measuring efficiency and quality in reversal measurement of complex structural components.