Free-motion wind tunnel testing using a three-degree-of-freedom magnetic suspension system

IF 2.3 3区工程技术 Q2 ENGINEERING, MECHANICAL Experiments in Fluids Pub Date : 2024-07-05 DOI:10.1007/s00348-024-03839-4

Kazuyuki Ueno, Takushi Sato, Yuki Takeda, Reo Nagasaka, Mamoru Kikuchi

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Abstract

A magnetic suspension system is developed for free-motion wind tunnel testing. An external magnet-yoke open magnetic circuit produces a levitation force acting on the disk magnet in the model, and stable suspension of the model is achieved by PID feedback control using two coils. The suspended models are free from support interference and move in three degrees of freedom in the wind tunnel. The pitch rotation around the y-axis and the translational motion in the xz plane under the influence of unsteady aerodynamic forces are observed using the motion capture technique. Parameter identification methods using Fourier analysis of the motion capture data are developed to determine the moment slope \(C_{\textrm{M}\alpha }\), lift slope \(C_{\textrm{L}\alpha }\) and drag coefficient \(C_{\textrm{D}}\). The standard deviations of the identified values of \(C_{\textrm{M}\alpha }\), \(C_{\textrm{L}\alpha }\) and \(C_{\textrm{D}}\) are less than 5%, 8% and 6% of the respective means.

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使用三自由度磁悬浮系统进行自由运动风洞试验

摘要为自由运动风洞试验开发了一种磁悬浮系统。外部磁轭开磁路产生作用于模型中圆盘磁铁的悬浮力，通过使用两个线圈的 PID 反馈控制实现模型的稳定悬浮。悬浮模型不受支架干扰，在风洞中以三个自由度运动。利用运动捕捉技术观察了在非稳定空气动力影响下绕 y 轴的俯仰旋转和 xz 平面上的平移运动。利用对运动捕捉数据的傅立叶分析，开发了参数识别方法，以确定力矩斜率（C_{\textrm{M}\alpha }\）、升力斜率（C_{\textrm{L}\alpha }\）和阻力系数（C_{\textrm{D}}\）。确定的 \(C_{textrm{M}\alpha }\) 、 \(C_{textrm{L}\alpha }\) 和 \(C_{textrm{D}}\) 值的标准偏差分别小于各自平均值的 5%、8% 和 6%。

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来源期刊

Experiments in Fluids 工程技术-工程：机械

CiteScore

5.10

自引率

12.50%

发文量

157

审稿时长

3.8 months

期刊介绍： Experiments in Fluids examines the advancement, extension, and improvement of new techniques of flow measurement. The journal also publishes contributions that employ existing experimental techniques to gain an understanding of the underlying flow physics in the areas of turbulence, aerodynamics, hydrodynamics, convective heat transfer, combustion, turbomachinery, multi-phase flows, and chemical, biological and geological flows. In addition, readers will find papers that report on investigations combining experimental and analytical/numerical approaches.