Purpose

The purpose of this paper is to analyze the stability of aeroelastic systems using a novel reduced order aeroelastic model.

Design/methodology/approach

The proposed aeroelastic model is a reduced-order model constructed based on the aerodynamic model identification using the generalized aerodynamic force response and the unsteady boundary element method in various excitation frequency values. Due to the low computational cost and acceptable accuracy of the boundary element method, this method is selected to determine the unsteady time response of the aerodynamic model. Regarding the structural model, the elastic mode shapes of the shell are used.

Findings

Three case studies are investigated by the proposed model. In the first place, a typical two-dimensional section is introduced as a means of verification by approximating the Theodorsen function. As the second test case, the flutter speed of Advisory Group for Aerospace Research and Development 445.6 wing with 45° sweep angle is determined and compared with the experimental test results in the literature. Finally, a complete aircraft is considered to demonstrate the capability of the proposed model in handling complex configurations.

Originality/value

The paper introduces an algorithm to construct an aeroelastic model applicable to any unsteady aerodynamic model including experimental models and modal structural models in the implicit and reduced order form. In other words, the main advantage of the proposed method, further to its simplicity and low computational effort, which can be used as a means of real-time aeroelastic simulation, is its ability to provide aerodynamic and structural models in implicit and reduced order forms.

中文翻译：

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基于边界元法系统辨识的气动弹性模型开发

目的

本文的目的是使用一种新的降阶气动弹性模型来分析气动弹性系统的稳定性。

设计/方法/方法

所提出的气动弹性模型是基于广义气动力响应和非定常边界元法在各种激励频率值下的气动模型辨识构建的降阶模型。由于边界元法计算成本低且精度可接受，因此选择该方法确定气动模型的非定常时间响应。关于结构模型，使用了壳的弹性模态。

发现

所提出的模型研究了三个案例研究。首先，通过逼近 Theodorsen 函数，引入典型的二维截面作为验证手段。作为第二个测试案例，确定了航空航天研发顾问团445.6机翼45°后掠角的颤振速度，并与文献中的实验测试结果进行了比较。最后，考虑一架完整的飞机来证明所提出的模型在处理复杂配置方面的能力。

原创性/价值

本文介绍了一种构建气动弹性模型的算法，该模型适用于任何非定常气动模型，包括隐式和降阶形式的实验模型和模态结构模型。换句话说，所提出的方法的主要优点，除了它的简单性和低计算量，可以用作实时气动弹性模拟的一种手段，是它能够以隐式和降阶形式提供空气动力学和结构模型.