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A flight demonstration for airframe noise reduction technology

机译：飞机降噪技术的飞行演示

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This article overviews activities and results for an initial flight demonstration of a project, FQUROH, to develop and mature airframe noise reduction technologies. The project aims to demonstrate technologies for reducing airframe noise through three flight tests using aircraft with modified high-lift devices and landing gear. It intends to verify the design methods that utilize advanced computational fluid dynamics (CFD) and the feasibility of practical noise reduction concepts. The main purposes of the initial demonstration using a JAXA's research aircraft in 2016 were to establish the processes for flight testing, including modification of the aircraft and experimental procedures, as well as to evaluate preliminary noise reduction designs. In the design process, noise reduction concepts for the flap and main landing gear were successfully applied to the actual complex geometries of the aircraft using advanced CFD, and the noise reduction effects were confirmed with noise measurements in wind tunnel tests. Based on the designs, the flap and main landing gear modifications were manufactured and installed on the aircraft. The flight demonstration campaign was successfully carried out with 177 noise source measurements, and encouraging results were obtained that show the feasibility of the noise reduction design method.
机译：本文概述了开发和成熟的机体降噪技术项目FQUROH的初始飞行演示的活动和结果。该项目旨在通过使用具有改进型高升力设备和起落架的飞机进行的三个飞行测试来演示降低机身噪声的技术。它旨在验证利用高级计算流体动力学（CFD）的设计方法以及实际降噪概念的可行性。 2016年使用JAXA的研究飞机进行初始演示的主要目的是建立飞行测试流程，包括飞机的改装和实验程序，以及评估初步的降噪设计。在设计过程中，使用先进的CFD成功地将襟翼和主起落架的降噪概念应用于飞机的实际复杂几何形状，并通过风洞测试中的噪声测量证实了降噪效果。根据设计，制造并安装了襟翼和主要起落架改装件，并将其安装在飞机上。通过177次噪声源测量成功地进行了飞行演示活动，并获得了令人鼓舞的结果，表明了降噪设计方法的可行性。

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