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首页> 外文会议>International Forum on Aeroelasticity and Structural Dynamics >EXPERIMENTAL AND ANALYTICAL INVESTIGATIONS OF A FIGHTER-LIKE WIND TUNNEL MODEL WITH EXTERNAL STORES
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EXPERIMENTAL AND ANALYTICAL INVESTIGATIONS OF A FIGHTER-LIKE WIND TUNNEL MODEL WITH EXTERNAL STORES

机译：外部商店的战斗机样风洞模型的实验和分析研究

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In a recently finished project the ability to design and manufacture advanced wind tunnel models have been addressed as well as the development of tools for analysis of nonlinear aeroelastic phenomena. Experimental static tests of a real aircraft pylon-store test asset indicated a nonlinear behaviour in the sway brace and store interface for low preload cases. This characteristics was then replicated in a model scale with a detailed hardware realisation. A fairly extensive low speed wind tunnel program was performed with different store configurations as well as parameter variations of the sway brace preload and mass properties of the external stores. A failure case with a free-play between the wing tip missile and pylon was also investigated. Small differences were found in flutter speed and amplitude at the neutrally stable condition depending on the preload or introduced free-play. However, when the preload is reduced to half nominal value there was more of a constant amplitude (LCO) behaviour at the critical speed. This could be due to an amplitude dependent structural damping, something which numerically is shown to have a quenching effect.
机译：在最近完成的项目中，已经解决了设计和制造先进的风洞模型的能力，以及开发非线性空气弹性现象的分析工具。实验静态试验真正的飞机塔 - 储存测试资产在摇摆支撑和储存界面中的非线性行为表示低预载案件。然后通过详细的硬件实现，在模型比例中复制该特征。使用不同的商店配置进行了相当广泛的低速风洞程序，以及外部商店的摇摆支架预加载和质量特性的参数变化。还研究了翼尖导弹和塔架之间自由游戏的故障情况。根据预加载或引入的自由游戏，在中性稳定条件下，在中性稳定状态下发现小差异。然而，当预载荷减小到半标称值时，在临界速度下有更多的恒定幅度（LCO）行为。这可能是由于幅度依赖性结构阻尼，其中数字地被示出具有淬火效果。

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