利用自由旋转法确定滚动阻尼系数

Q2 Engineering

INCAS Bulletin Pub Date : 2024-03-11 DOI:10.13111/2066-8201.2024.16.1.2

Ionuț Bunescu, Mihai-Victor Pricop, M. Stoican, Mihai-Vlăduţ Hothazie

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引用次数: 0

摘要

自由旋转法是空气动力学实验中确定滚动阻尼系数的最简单方法。应用这种方法时，需要将模型旋转到所需的角速度，然后释放模型，使其在流动条件下自由旋转，并记录模型滚动率的时间变化。这样，在接近零和所需角速度之间的任何滚动率上应用对数递减公式，就可以计算出滚动阻尼力矩。本文介绍了自由旋转方法在不同马赫数和发生率下获得的原始数据上的应用，并考虑了不同的回归函数、时间窗口及其影响。最后还介绍了必要的修正方法及其对结果的影响。

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Identification of roll damping coefficient using the free rotation method

The free rotation method represents the simplest method for roll damping coefficient identification in experimental aerodynamics. To apply this method, it is necessary to spin the model to a desired angular velocity and then release the model to spin freely under flow conditions, recording the variation in time of the model’s rolling rate. Thus, applying the logarithmic decrement formula at any roll rate between near zero and the desired angular velocity, the roll damping moment will be calculated. This paper presents the application of the free rotation method on raw data obtained for different Mach numbers and incidences, considering different regression functions, time windows and their implications. Last but not least, the necessary correction methods and their impact on the results are presented.

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来源期刊

INCAS Bulletin Engineering-Aerospace Engineering

自引率

0.00%

发文量

审稿时长

8 weeks

期刊介绍： INCAS BULLETIN is a scientific quartely journal published by INCAS – National Institute for Aerospace Research “Elie Carafoli” (under the aegis of The Romanian Academy) Its current focus is the aerospace field, covering fluid mechanics, aerodynamics, flight theory, aeroelasticity, structures, applied control, mechatronics, experimental aerodynamics, computational methods. All submitted papers are peer-reviewed. The journal will publish reports and short research original papers of substance. Unique features distinguishing this journal: R & D reports in aerospace sciences in Romania The INCAS BULLETIN of the National Institute for Aerospace Research "Elie Carafoli" includes the following sections: 1) FULL PAPERS. -Strength of materials, elasticity, plasticity, aeroelasticity, static and dynamic analysis of structures, vibrations and impact. -Systems, mechatronics and control in aerospace. -Materials and tribology. -Kinematics and dynamics of mechanisms, friction, lubrication. -Measurement technique. -Aeroacoustics, ventilation, wind motors. -Management in Aerospace Activities. 2) TECHNICAL-SCIENTIFIC NOTES and REPORTS. Includes: case studies, technical-scientific notes and reports on published areas. 3) INCAS NEWS. Promote and emphasise INCAS technical base and achievements. 4) BOOK REVIEWS.