Aerodynamic Characterization of a New Concept of Long Range Projectiles from Free Flight Data

We present the design steps of a coaxial dipole antenna for telemetry applications under extreme conditions of accelerations and centrifugal forces. Both, electromagnetic and mechanical designs are explained, as well as performance compromises that have to be made between both domains. The experimental results are given in the following part of the article, before some details on the instrumented firings and the receiving station; at last a few examples of projectiles equipped with such antennas are presented.

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“…The test campaign took place in the year 2017. The scientific results of the firings can be found in [10,11].…”

Section: Long-range Projectile With Finsmentioning

confidence: 99%

Telemetry antennas withstanding very high accelerations and centrifugal forces

Bernard

Covic

Zeiner

et al. 2021

Int. J. Microw. Wireless Technol.

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“…Therefore, the following data are analyzed: the signals of axial A x and radial A y , A z accelerometer; radial G y , G z gyroscopes; and axial H x and radial H y , H z magnetometers. These sensors have been previously used and calibrated in ISL's works, and their equations with further details are presented in [29,[36][37][38]. All of their signals are time-varying.…”

Section: B Quasi-lpv Modelmentioning

confidence: 99%

Global Sensitivity Analysis for Modeling the Free-Flight Behavior of an Artillery Projectile

Machala

Collin²,

Gilson³

et al. 2020

AIAA Journal

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A vehicle's in-flight behavior can be represented by the Newton-Euler equations of motion: usually, such a model has a nonlinear and continuous description based on ordinary differential equations. The model structure can be altered using analytic transformations-such as transformation into a quasi-LPV structure-and, when the model is supposed to reflect an existing physical system, some of its parameters might be uncertain. This paper's objective is twofold: firstly, to investigate if a quasi-LPV model does accurately replicate the physical behavior of a large-caliber spin-stabilized projectile in free flight; and secondly, to verify if the available embedded sensors data could be used to determine non-identifiability of uncertain model parameters. In order to investigate these prospects, a permutation-based global sensitivity analysis is employed. The proposed study has highlighted the non-identifiable parameters of the model, either during the whole flight or some periods of it. These results can help to enhance the preparation of free flight experiments at the open-range test site of the French-German Research Institute of Saint Louis. Nomenclature M = Mach number V = airspeed, m s −1 α, β, α t = angle of attack, angle of sideslip, total angle of attack, deg C X , C N α , C y pα = axial force, normal force slope, and Magnus force slope coefficients C lp , C mα , C mq , C npα = roll damping, pitch moment slope, pitch damping and Magnus moment slope coefficients

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“…With the objective to integrate a telemetry unit onboard two types of gun-launched projectiles of caliber 24 mm, an upgrade of the metasurface antenna presented above is proposed here in order to further reduce its thickness down to hc = 12.6 mm. The first one is illustrated in Figure 17a, and is an innovative concept of a Long Range Projectile with large wings [18,19]. The second one is a gyrostabilized projectile, which can be seen in Figure 17 (b).…”

Section: Metasurface Antennas In Small Cavities For Telemetry Applicamentioning

confidence: 99%

Metasurface Antennas Embedded in Small Circular Cavities for Telemetry Applications

et al. 2019

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This paper introduces a metasurface-inspired antenna embedded in a circular metallic cavity with a very small diameter (from 0.25 λ0 down to 0.12 λ0, where λ0 is the wavelength in vacuum at the operating frequency). The proposed concept is introduced and explained: It consists of placing a capacitive surface at the cavity aperture. This capacitive effect is obtained using multi-layer capacitively coupled strips. Our numerical results demonstrate that the impedance bandwidth is larger than that of standard patch antennas embedded in the same cavity size. Various prototypes have been manufactured, and measurements are found to be in good agreement with numerical results in all cases. The practical applications of these small metasurface antennas are demonstrated with telemetry applications for flying vehicles.

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Aerodynamic Characterization of a New Concept of Long Range Projectiles from Free Flight Data

Cited by 9 publications

References 0 publications

Telemetry antennas withstanding very high accelerations and centrifugal forces

Telemetry antennas withstanding very high accelerations and centrifugal forces

Global Sensitivity Analysis for Modeling the Free-Flight Behavior of an Artillery Projectile

Metasurface Antennas Embedded in Small Circular Cavities for Telemetry Applications

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