High-Fidelity AeroAcoustic Optimization Tool for Flexible Rotors

Wang Li; Diskin Boris; Lopes Leonard V; Nielsen Eric J.; Lee-Rausch Elizabeth; Biedron Robert T.

摘要

A high-fidelity multidisciplinary analysis and gradient-based optimization tool for rotorcraft aero-acoustics is presented. Tightly coupled discipline models include physics-based computational fluid dynamics, rotorcraft comprehensive analysis, and noise prediction and propagation. A discretely consistent adjoint methodology accounts for sensitivities of unsteady flows and unstructured, dynamically deforming, overset grids. The sensitivities of structural responses to blade aerodynamic loads are computed using a complex-variable approach. Sensitivities of acoustic metrics are computed by chain-rule differentiation. Interfaces are developed for interactions between the discipline models for rotorcraft aeroacoustic analysis and the integrated sensitivity analysis. The multidisciplinary sensitivity analysis is verified through a complex-variable approach. To verify functionality of the multidisciplinary analysis and optimization tool, an optimization problem for a 40% Mach-scaled HART-II rotor-and-fuselage configuration is crafted with the objective of reducing thickness noise subject to aerodynamic and geometric constraints. The optimized configuration achieves a noticeable noise reduction, satisfies all required constraints, and produces thinner blades as expected. Computational cost of the optimization cycle is assessed in a high-performance computing environment and found to be acceptable for design of rotorcraft in general level-flight conditions.

机译：提出了一种高保真多学科分析和基于梯子的基于梯度的优化工具。紧密耦合的纪律模型包括基于物理的计算流体动力学，旋翼飞行综合分析和噪声预测和传播。一致的一致伴随方法占不稳定流动和非结构化，动态变形，销命网格的敏感性。使用复杂可变方法计算对叶片空气动力载荷的结构响应的敏感性。通过链规则分化计算声学度量的敏感性。开发了接口，用于旋翼机气声学分析和综合敏感性分析的学科模型之间的相互作用。通过复杂可变方法验证多学科敏感性分析。为了验证多学科分析和优化工具的功能，为40％MACH-SCALED HART-II转子和机身配置的优化问题采用了减少空气动力学和几何约束的厚度噪声的目的。优化配置实现了明显的降噪，满足所有所需的约束，并根据所预期产生更薄的叶片。在高性能计算环境中评估优化周期的计算成本，发现在一般水平飞行条件下旋翼飞行器设计是可接受的。

High-Fidelity AeroAcoustic Optimization Tool for Flexible Rotors

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