民机总体设计参数选择与多目标优化

Parameter selection and multi-objective optimization of civil aircraft conceptual design

基于优化算法需要和民机设计的特点提出了参数选择的新思路。为避免抖振和飞行品质问题明确了巡航飞行马赫数、最大运行马赫数和阻力发散马赫数的相互关系;数值分析表明,使用翼根相对厚度作为参数的机翼重量公式更为合理,对改善分析精度有利。以A320为算例,采用多目标粒子群算法优化得到的优化解与原机型的设计指标和参数接近,避免了以往出现的问题,从而证明参数选择的优越性。

A new approach to design parameter selection is proposed based on civil aircraft design experiences.A numerical relationship between various design Mach numbers（cruising Mach、Maximum Mach、Resistance diffusion Mach） is presented to improve the feasibility of optimized design regarding safe buffet margin.Quantitative evidence is also presented which suggests the thickness-to-chord ratio at wing root is superior to the more orthodox average ratio in representing the influence of geometry parameters on wing weight.An analysis of design optimization to the same specification A320 using the set of parameters is well corroborated testified the validity of this approach.