Multidisciplinary Trim Analysis Using Improved Optimization, Image Analysis, and Machine Learning Algorithms 

T. Herrmann, J. Baeder, R. Celi
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Abstract

A multiobjective design optimization methodology is used to determine the trim controls that minimize power required, noise, and blade loads of a coaxial-pusher rotorcraft, and to quantify the trade-offs among those three objectives in the form of 3-dimensional Pareto frontiers. A moderate-fidelity simulation model is used, which includes blade flexibility and a free vortex rotor wake model. A hybrid optimizer is developed, which starts with a genetic algorithm and radial basis function-based response surfaces, and ends with a gradient-based refinement. A new gradient-based method for constrained multiobjective optimization is developed, based on an extension of the method of feasible directions. A new technique for the automatic interpretation of rotor maps, based on image analysis and k-means clustering is presented. A new technique based on a k-nearest neighbor algorithm predicts trimmability. These two techniques reduce the need for analyst intervention during the optimization and improve accuracy. Results are presented for a 6- and an 8-control effector coaxial configuration in high speed flight.
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多学科修剪分析使用改进的优化,图像分析和机器学习算法
采用多目标设计优化方法,确定了使同轴推进旋翼机所需功率、噪声和叶片载荷最小化的内饰控制,并以三维帕累托边界的形式量化了这三个目标之间的权衡。采用了包含叶片柔性和自由旋涡尾迹模型的中等保真度仿真模型。提出了一种以遗传算法和基于径向基函数的响应面为起点,以梯度优化为终点的混合优化算法。在可行方向法的基础上,提出了一种基于梯度的约束多目标优化方法。提出了一种基于图像分析和k-means聚类的旋翼图自动判读新技术。一种基于k近邻算法的预测可裁剪性的新技术。这两种技术减少了优化过程中分析师干预的需要,提高了准确性。结果提出了一个6-和8-控制效应器同轴配置在高速飞行。
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