复杂产品设计需要建立多个学科领域模型,传统设计方法造成大量"模型孤岛"和信息不一致性.为了优化产品全局运行性能,必须集成孤立的多学科模型,实现多学科耦合分析以及多学科设计优化.本文采用基于模型的系统工程(model-based systems engineering, MBSE)方法,研究复杂产品设计过程中多学科建模方法和模型集成技术.在MBSE方法指导下,本文研究和建立了涡轮叶片冷却结构设计的几何模型、气动分析模型、传热分析模型以及设计优化模型等. MBSE建模方法突破了传统的专业界限,在统一体系架构下建立多学科模型,可以消除多学科模型不一致性,以及实现了多学科模型集成. MBSE方法的应用能够提高复杂产品设计效率和水平.
英文摘要:
Complex engineering design requires building a considerable number of multidisciplinary models, among which a plethora of isolated islands and description inconsistencies were created by conventional engineering design approaches. To enhance the global performance measures of a complex engineering system, engineers must bridge these isolated models, eliminate model inconsistencies, and effectively analyze system-model interactions. Systems engineering approaches appear to be essential to multidisciplinary design optimization of complex engineering systems. Here, unified multidisciplinary modeling of complex engineering systems is addressed by using the model-based systems engineering (MBSE) methodology. Following the MBSE principles, this work builds up an integrated hierarchy of geometric, aerodynamics, heat transfer, structure dynamics, and design optimization models, which are used to support the development of turbine blade cooling structures. MBSE approaches break through traditional disciplinary boundaries and adopt a standard modeling language to build coherent models describing various disciplinary phenomena of interest. Implementations of MBSE approaches in conjunction with SysML models are expected to identify and eliminate readily the model inconsistencies, boost integration of multidisciplinary models, and increase engineering design efficiency significantly.