Numerical Evauation of Effect of Atmospheric Turbulence on Sonic Boom Observed in D-SEND#2 Flight Test

Kanamori, Masashi; Takahashi, Takashi; Naka, Yusuke; Makino, Yoshikazu; Takahashi, Hidemi; Ishikawa, Hiroaki

doi:10.2514/6.2017-0278

Cited by 16 publications

(5 citation statements)

References 19 publications

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“…Japan Aerospace Exploration Agency has carried out several experiments at the Esrange Space Center in northern Sweden to launch the low explosive supersonic aircraft model from the balloon platform (D-SEND program). 7 Chinese Academy of Sciences has also conducted feasibility analysis and flight tests on the fixedwing UAV 8 and the micro-UAVs 9 launched from a highaltitude balloon platform, which verified the platform launching performance. However, it has not been tested to launch folding wing UAVs in batches by using highaltitude balloons.…”

Section: Introductionmentioning

confidence: 90%

Dynamics simulation of folding wing UAVs launched from a high-altitude balloon platform

Zhang

Yang

Cai

2023

Proceedings of the Institution of Mechanical Engineers, Part G:

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It is a new application of the high-altitude balloon system to launch multiple small folding wing unmanned aerial vehicles (UAVs). Based on the design of the launching system, we conduct numerical simulations of the ejection process from the balloon platform and the subsequent UAV wing deployment with trajectory leveling operation. We use the Kane method to establish the dynamic model of the balloon launching platform in the inertial coordinate system (ICS). By introducing the degree of freedom of UAV sliding along the sliding track, we realize the dynamic simulation of eight UAV launching processes and obtain the instantaneous separated states. The folding wing UAV first deploys its wings after ejection, which has the coupling characteristics between structural deformation and attitude adjustment. It is regarded as a multi-rigid body connecting structure composed of the fuselage and four wings. We establish the dynamic simulation model by the Kane method in the UAV body coordinate system (BCS). The Radau pseudo-spectral method is used to calculate the flight trajectory of each UAV. This paper is an engineering application research and can provide a simulation reference for the launching test of the balloon-borne folding wing UAV program.

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Section: Introductionmentioning

confidence: 90%

Dynamics simulation of folding wing UAVs launched from a high-altitude balloon platform

Zhang

Yang

Cai

2023

Proceedings of the Institution of Mechanical Engineers, Part G:

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“…Turbulence model research codes based on this equation solution have been developed within the Sonic Booms in Atmospheric Turbulence (SonicBAT) Program by NASA and incorporated into the PCBoom sonic boom prediction software to estimate the effect of turbulence on the levels of shaped sonic booms associated with several low boom aircraft designs [66]. Other nonlinear models have also been applied to sonic boom propagation, including a a time domain solution of the nonlinear progressive wave equation (NPE) [67], a combined time domain and spectral approach called FLHOWARD [68] using a partially one-way equation and a similar but one-way equation called HOWARD [69,70]. The latest methodology has been implemented in a code developed in 2021 called SPnoise for Sonic Boom [71].…”

Section: Advances In Pressure Propagationmentioning

confidence: 99%

Review of Sonic Boom Prediction and Reduction Methods for Next Generation of Supersonic Aircraft

Bonavolontà,

Lawson,

Riaz

2023

Aerospace

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The reduction of sonic boom levels is the main challenge but also the key factor to start a new era of supersonic commercial flights. Since 1970, a FAA regulation has banned supersonic flights overland for unacceptable sonic booms at the ground, and many research studies have been carried out from that date to understand sonic boom generation, propagation and effects, both on the environment and communities. Minimization techniques have also been developed with the attempt to reduce sonic boom annoyance to acceptable levels. In the last 20 years, the advances in both knowledge and technologies, and companies and institutions’ significant investments have again raised the interest in the development of new methods and tools for the design of low boom supersonic aircraft. The exploration of unconventional configurations and exotic solutions and systems seems to be needed to effectively reduce sonic boom and allow supersonic flight everywhere. This review provides a description of all aspects of the sonic boom phenomenon related to the design of the next generation of supersonic aircraft. In particular, a critical review of the prediction and minimization methods found in the literature, aimed at identifying their strengths, limitations and gaps, is made, along with a complete overview of disruptive unconventional aircraft configurations and exotic active/passive solutions to boom level reduction. The aim of the work is to give a clear statement of state-of-the-art sonic boom prediction methods and possible reduction solutions to be explored for the design of next low-boom supersonic aircraft.

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“…The Shaped Sonic Boom Demonstration (SSBD) American program demonstrated in 2003 for the first time in-flight boom mitigation by modifying the aftfuselage of an F-18 fighter [5]. The Japanese D-SEND program [6] measured and compared the boom levels of two dropped bodies of revolution, one of which with a low boom design. At NASA, the X-59 Quiet Supersonic Technology demonstrator) is currently in testing phase to reach a ground boom Perceived Level [7] of 75 PLdB in standard atmosphere [8].…”

Section: Introductionmentioning

confidence: 99%

Design of a low frequency, impulsive sound simulator in an existing house for sonic boom perceptual studies

Cretagne,

Garcia A.,

Leconte

et al. 2023

Acta Acust.

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The renewal of civil supersonic aviation is partly conditioned by the establishment of an international regulation on sonic boom level. Human perception of booms from future aircraft creating sound disturbances of lower level than past ones can currently be evaluated only through boom simulators in laboratory setups with predicted signatures from numerical simulations. To reach sufficient ecological validity, it is necessary that perception studies take place in an environment as familiar as possible to participants. With this in view, a simulator has been designed to reproduce sonic booms of low amplitude with the highest possible fidelity and control, while adapting to an existing house. The article presents the challenges and design solutions chosen to reach this objective. A double optimisation of the input signal, successively in the frequency and in the time domain, is described. Observed performances are presented for different boom exposures and in various rooms of the house.

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Numerical Evauation of Effect of Atmospheric Turbulence on Sonic Boom Observed in D-SEND#2 Flight Test

Cited by 16 publications

References 19 publications

Dynamics simulation of folding wing UAVs launched from a high-altitude balloon platform

Dynamics simulation of folding wing UAVs launched from a high-altitude balloon platform

Review of Sonic Boom Prediction and Reduction Methods for Next Generation of Supersonic Aircraft

Design of a low frequency, impulsive sound simulator in an existing house for sonic boom perceptual studies

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