复杂工程系统优化设计面临的问题及解决方法

指出用常规优化方法对复杂工程系统进行优化设计时面临的效率、精度和复杂信息交换等三方面问题,并结合复杂工程系统的优化计算过程,详细分析产生这些问题的原因。采用响应面方法,构建一种逐步逼近的序列响应面迭代优化计算格式。该方法使优化进程中复杂的系统分析模型被响应面模型所取代;同时还构造了一个系统数据库,在每一迭代步都有新的数据加入到该数据库中,响应面模型根据扩展后的数据库不断更新从而逐步逼近真实模型。为在保证精度的前提下减少计算量,提供一种加入数据库中新数据的选取方法,利用此方法实现了一大型运输机机翼的气动-结构一体化优化设计,计算结果表明该方法的有效性。

PROBLEMS IN COMPLEX ENGINEERING SYSTEM OPTIMIZATION DESIGN AND ALTERNATIVE SOLUTION

Problems of low efficiency, low accuracy and complex information exchange in the application of conventional optimization approach to complex engineering system optimization design are pointed out. Reasons for the presence of these problems are explained in detail by analyzing the calculation process of complex system optimization. The response surface method is introduced to solve these problems, based on which an iterative method of series response surface is presented. In this method, complex system analysis is replaced by response surface model analysis and a database of the complex system is constructed. At each iteration, the database is expanded through new added data and then the response surface model is refined according to the expanded database, which makes the response surface model more and more accurate until convergence is achieved. Moreover, to decrease the amount of computation while retaining high accuracy, this method provides a systematic way of choosing the new added data. In the last section, a large-scale transporter wing design problem is solved successfully by this series response surface method, which shows the validity of the method.