Prediction of Trajectories of Projectiles Launched from Helicopters

Gong, Hyojoon; Kwak, Einkeun; Lee, Seungsoo; Park, Jae-Seong

doi:10.5139/jksas.2014.42.3.213

Cited by 1 publication

(3 citation statements)

References 2 publications

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“…The aerodynamic coefficients of the rocket were identical to those used in the wind tunnel test of Dahlke et al [11]. The rocket motion analysis result was exactly the same as that in the simulation in [3], as shown in Fig. 11.…”

Section: Rocket Motion Analysismentioning

confidence: 62%

“…However, the full CFD methodology could be analyzed only under specific initial launch conditions due to the numerous computational resources and extensive calculation time required, which made it unsuitable for predicting the entire trajectory and range of the rocket under various external winds. Gong et al [3] used the actuator disk model to analyze the downwash inflow from the rotor of a UH-60A helicopter. The downwash effects on the Hydra70 rocket and a Sierra bullet were compared.…”

Section: Fig 1 Schematics Of Downwash Effect and Wind-fuselage Intermentioning

confidence: 99%

“…The results of the rocket motion analysis were compared with the simulation results of the previous study [3,4]. The condition for the simulation was a Hydra70 rocket launched horizontally at a 50-m height.…”

Section: Rocket Motion Analysismentioning

confidence: 99%

See 2 more Smart Citations

Unguided Rocket Trajectory Analysis under Rotor Wake and External Wind

Kim¹,

Chae²,

Yee³

2018

JKSAS

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Precise striking is a core capability of armed helicopters. Predicting the downwash effect, which is the interaction between the rotor wake and the launched rocket, is key to achieving precise striking capability, and many researches have been conducted in this regard. However, it is still imperative to predict the downwash effect considering that external winds induce a skewed rotor wake, which can alter the downwash effect. This study aims to develop a novel algorithm to investigate the downwash effects imposed on the rocket under the circumstances of helicopter downwash due to external wind. Using the actuator model and 6DOF analysis, the trajectory variance due to the downwash effect is physically investigated based on aerodynamics and stability of the rocket. In addition, the range variance characteristics of the rocket are analyzed by considering the downwash effect caused by the skewed wake under various external wind conditions. It is concluded that a longer range of the iv rocket is obtained under rear wind than under calm wind because the downwash effect is more influenced by the skewed wake under the rear wind. In addition, the increase in the range is limited to a specific velocity of the rear wind due to the rocket acceleration.

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Section: Rocket Motion Analysismentioning

confidence: 62%

Section: Fig 1 Schematics Of Downwash Effect and Wind-fuselage Intermentioning

confidence: 99%