Wind tunnel measurements of the dynamic stability derivatives of a fin-stabilized projectile by means of a 3-axis freely rotating test bench

Muller, Laurène; Libsig, Michel; Martinez, Bastien; Bastide, Myriam; Bidino, Denis; Bailly, Yannick; Roy, J.C.

doi:10.2514/6.2020-2782

Cited by 3 publications

(4 citation statements)

References 8 publications

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“…Equation (1) provides the resulting mathematical expression (Muller et al, 2019) of the pinhole model applied to a single camera: The so-called intrinsic parameters a u , a v , u 0 and v 0 are specific to the lens of the camera, whereas the three Euler angles of the rotation matrix R 3Â3 and the three components of the translation vector T 3Â1 are the extrinsic parameters that express the camera position relative to the object. These ten parameters are determined using the calibration process of Heikkila and Silven (1997) with the 3D raw card.…”

Section: Measurement Of the Three-dimensional Motionmentioning

confidence: 99%

“…Equation (1) provides the resulting mathematical expression (Muller et al, 2019) of the pinhole model applied to a single camera:…”

Section: Measurement Of the Three-dimensional Motionmentioning

confidence: 99%

“…This method is based on a three-axis freely rotating test bench. Preliminary results of this project have been presented in Martinez et al (2015) and Muller et al (2019). The final goal of this test benchcalled MiRois to investigate the attitude of spin-stabilised models containing decoupled actuators (Martinez et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

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Wind tunnel measurements of dynamic aerodynamic coefficients using a freely rotating test bench

Muller

Libsig

Bailly

et al. 2023

HFF

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Purpose This paper aims to propose a dedicated measurement methodology able to simultaneously determine the stability derivative Cmα̇ and the pitch damping coefficient sum Cmq + Cmα̇ in a wind tunnel using a single and almost non-intrusive metrological setup called MiRo. Design/methodology/approach To assess the MiRo method’s reliability, repeatability and accuracy, the measurements obtained with this technique are compared to other sources like aerodynamic balance measurements, alternative wind tunnel measurements, Ludwieg tube measurements, free-flight measurements and computational fluid dynamics (CFD) simulations. Two different numerical approaches are compared and used to validate the MiRo method. The first numerical method forces the projectile to describe a pure oscillation motion with small amplitude along the pitch axis during a rectilinear flight, whereas the second numerical approach couples the one degrees of freedom simulation motion equations with CFD methods. Findings MiRo, a novel and almost non-intrusive technique for dynamic wind tunnel measurements, has been validated by comparison with five other experimental and numerical methodologies. Despite two completely different approaches, both numerical methods give almost identical results and show that the holding system has nearly no impact on the dynamic aerodynamic coefficients. Therefore, it could be assessed that the attitude of MiRo model in the wind tunnel is very close to the free-flight one. Originality/value The MiRo method allows studying the attitude of a projectile in a wind tunnel with the least possible impact on the flow around a model.

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Section: Measurement Of the Three-dimensional Motionmentioning

confidence: 99%

“…Equation (1) provides the resulting mathematical expression (Muller et al, 2019) of the pinhole model applied to a single camera:…”

Section: Measurement Of the Three-dimensional Motionmentioning

confidence: 99%

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Wind tunnel measurements of dynamic aerodynamic coefficients using a freely rotating test bench

Muller

Libsig

Bailly

et al. 2023

HFF

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“…The forced sinusoidal-oscillation-based stability derivative extraction is the most popular method due to the well-developed Fourier theory and the easy practical realization [5,23,36]. There are also works reported with different methodologies, such as the work reported in [37].…”

Section: Introductionmentioning

confidence: 99%

Stability Derivatives of Various Lighter-than-Air Vehicles: A CFD-Based Comparative Study

Anoop

Velamati

Janardhanan

et al. 2022

Drones

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An aerostat with a single tether is proposed for the application of wind measurements at low altitudes. In the current study, the aerodynamic model parameters (stability derivatives) of the aerostat are investigated based on a CFD-based approach. The static, as well as the dynamic stability derivatives of the aerostats are presented. The calculation of the dynamic stability derivatives involves the simulation of the oscillations of the aerostats in their axial direction (surge), the vertical direction (heave) and angular motions with respect to the lateral direction (pitch). A forced sinusoidal oscillation is used for the simulation of the aerostat, and one stable period of oscillation is taken for the derivatives’ extraction. Four different aerostats are considered for the current study with four different angles of attack. The Zhiyuan aerostat, HAA aerostat, NPL aerostat and GNVR aerostat are the aerostats considered for this study. The stability derivative results obtained for the four aerostats are analyzed and compared with respect to their geometrical features. From the static aerodynamic characteristics, the Zhiyuan aerostat shows better performance than the other aerostats in terms of the lift–drag ratio. The dynamic stability derivatives of the Zhiyuan aerostat suggest its application as the proposed low-altitude wind measurement system.

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Estimation of Stability Derivatives Due to Translational Motion of Various LTA Vehicles Using CFD

Anoop

Velamati

Janardhanan

et al. 2022

Lecture Notes in Mechanical Engineering

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Wind tunnel measurements of the dynamic stability derivatives of a fin-stabilized projectile by means of a 3-axis freely rotating test bench

Cited by 3 publications

References 8 publications

Wind tunnel measurements of dynamic aerodynamic coefficients using a freely rotating test bench

Wind tunnel measurements of dynamic aerodynamic coefficients using a freely rotating test bench

Stability Derivatives of Various Lighter-than-Air Vehicles: A CFD-Based Comparative Study

Estimation of Stability Derivatives Due to Translational Motion of Various LTA Vehicles Using CFD

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