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为解决协同优化(CO)方法计算量过大、收敛速度较慢的问题,提出了一种面向复杂工程系统多学科设计优化的改进的快速收敛协同优化方法(IFCCO).首先,将系统优化的全部设计变量分为全局设计变量和局部设计变量两个部分,在系统级添加各子学科内与全局设计变量相关的约束条件,使得系统级优化只控制全局设计变量,而学科级则只控制局部设计变量,从而消去辅助设计变量;然后,基于学科状态方程,在系统级和学科级同时构建耦合变量的一致性约束条件,保证更严格的耦合变量一致性求解,并赋予各子学科完全的自治权.通过两个典型的MDO算例检验了IFCCO方法的计算特性,结果表明:该方法在严格保证耦合变量一致的前提下,计算量大大减少,收敛速度得到很大提高.
In order to solve the problem of excessively large amount of calculation and slow convergence rate of the collaborative optimization (CO) method, an improved fast convergence and cooperation optimization method (IFCCO) for multidisciplinary design optimization of complex engineering systems is proposed.First, All design variables are divided into global design variables and local design variables in two parts, add the constraints associated with the global design variables in the various sub-disciplines at the system level, so that the system-level optimization only controls the global design variables, while the subject level only controls the local Design variables to eliminate the auxiliary design variables. Then, based on the discipline state equation, the consistency constraints of the coupling variables are constructed at the system level and the discipline level to ensure more strict consistency of the coupling variables and give full autonomy The two typical MDO examples verify the computational characteristics of the IFCCO method. The results show that the proposed method reduces the computational cost greatly and the convergence speed is greatly improved under the premise of ensuring the consistency of the coupling variables.