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首页> 外文期刊>Journal of the American Helicopter Society >Application of Low- and High-Fidelity Simulation Tools to Helicopter Rotor Blade Optimization
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Application of Low- and High-Fidelity Simulation Tools to Helicopter Rotor Blade Optimization

机译：低保真仿真工具在直升机旋翼优化中的应用

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摘要

New helicopter rotor designs are desired that offer increased efficiency, reduced vibration, and reduced noise. Multidisci-plinary optimization of rotors has been advanced by the development of "comprehensive" rotorcraft analysis tools; however, these tools lack built-in high-fidelity aerodynamic models. Accurate airload predictions utilize computational fluid dynamics (CFD) coupled to the computational structural dynamics (CSD) of a comprehensive code. These methods are too computationally intensive for numerous function calls as in optimization. Thus, an approach is needed where high-fidelity simulations can be routinely used in optimization. The process presented in this paper combines the results of a simplified aerodynamic low-fidelity simulation with a selected number of high-fidelity CFD/CSD simulations. The process is demonstrated for a four-bladed hingeless rotor. Design variables include tip geometry and spanwise twist. Approximation models are built for high-fidelity metrics for rotor efficiency and vibration. Optimization using these approximation models found a design having maximum rotor efficiency while constraining vibration.
机译：需要新的直升机旋翼设计，以提供更高的效率，减少的振动和减少的噪音。通过开发“综合性”旋翼飞机分析工具，推进了旋翼的多学科优化。但是，这些工具缺少内置的高保真空气动力学模型。准确的空载预测将计算流体动力学（CFD）与综合代码的计算结构动力学（CSD）耦合在一起。对于优化中的众多函数调用而言，这些方法的计算量很大。因此，需要一种可以在优化中例行使用高保真模拟的方法。本文介绍的过程将简化的空气动力学低保真度模拟的结果与选定数量的高保真度CFD / CSD模拟相结合。演示了四叶无铰链转子的加工过程。设计变量包括尖端几何形状和翼展方向扭曲。近似模型是针对转子效率和振动的高保真度指标而构建的。使用这些近似模型进行的优化发现，设计具有最大的转子效率，同时又能抑制振动。

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