Free-Flight Trajectory Simulation of the ADEPT Sounding Rocket Test Using US3D

2017 ◽  
Author(s):  
Jakob Hergert ◽  
Joseph Brock ◽  
Eric Stern ◽  
Michael C. Wilder ◽  
David W. Bogdanoff
Keyword(s):  
Sounding Rocket ◽  
Flight Trajectory ◽  
Free Flight ◽  
Trajectory Simulation

scholarly journals Aerial course stabilization is impaired in motion-blind flies

2020 ◽  
Author(s):  
Maria-Bianca Leonte ◽  
Aljoscha Leonhardt ◽  
Alexander Borst ◽  
Alex S. Mauss
Keyword(s):  
Motion Detection ◽  
Visual Motion ◽  
Flight Performance ◽  
Wild Type ◽  
Flight Trajectory ◽  
Free Flight ◽  
Motion Vision ◽  
Circling Behaviour ◽  
Course Control ◽  
Self Motion

AbstractVisual motion detection is among the best understood neuronal computations. One assumed behavioural role is to detect self-motion and to counteract involuntary course deviations, extensively investigated in tethered walking or flying flies. In free flight, however, any deviation from a straight course is signalled by both the visual system as well as by proprioceptive mechanoreceptors called ‘halteres’, which are the equivalent of the vestibular system in vertebrates. Therefore, it is yet unclear to what extent motion vision contributes to course control, or whether straight flight is completely controlled by proprioceptive feedback from the halteres. To answer these questions, we genetically rendered flies motion-blind by blocking their primary motion-sensitive neurons and quantified their free-flight performance. We found that such flies have difficulties maintaining a straight flight trajectory, much like control flies in the dark. By unilateral wing clipping, we generated an asymmetry in propulsory force and tested the ability of flies to compensate for this perturbation. While wild-type flies showed a remarkable level of compensation, motion-blind animals exhibited pronounced circling behaviour. Our results therefore unequivocally demonstrate that motion vision is necessary to fly straight under realistic conditions.

Rocket attitude determination by a Fourier method

1979 ◽  
Vol 57 (5) ◽  
pp. 728-732 ◽  
Author(s):  
D. W. Green ◽  
B. G. Wilson
Keyword(s):  
Optical Sensor ◽  
Additional Data ◽  
Attitude Determination ◽  
Fourier Method ◽  
Angular Motion ◽  
Sounding Rocket ◽  
Free Flight ◽  
Transverse Axis ◽  
Magnetometer Data

It is shown that the parameters completely specifying the angular motion of a symmetrical sounding rocket in torque-free flight may in general be determined from a Fourier-transformed segment of transverse-axis magnetometer data, with limited additional data from an auxiliary optical sensor. The method is simple and rapid, and an example is worked out.

scholarly journals Aerial course stabilization is impaired in motion-blind flies

2021 ◽  
Author(s):  
Maria-Bianca Leonte ◽  
Aljoscha Leonhardt ◽  
Alexander Borst ◽  
Alex S. Mauss
Keyword(s):  
Visual Motion ◽  
Flight Performance ◽  
Propulsive Force ◽  
Wild Type ◽  
Flight Trajectory ◽  
Free Flight ◽  
Motion Vision ◽  
Circling Behaviour ◽  
Course Control ◽  
Course Changes

Visual motion detection is among the best understood neuronal computations. As extensively investigated in tethered flies, visual motion signals are assumed to be crucial to detect and counteract involuntary course deviations. During free flight, however, course changes are also signalled by other sensory systems. Therefore, it is yet unclear to what extent motion vision contributes to course control. To address this question, we genetically rendered flies motion-blind by blocking their primary motion-sensitive neurons and quantified their free-flight performance. We found that such flies have difficulties maintaining a straight flight trajectory, much like unimpaired flies in the dark. By unilateral wing clipping, we generated an asymmetry in propulsive force and tested the ability of flies to compensate for this perturbation. While wild-type flies showed a remarkable level of compensation, motion-blind animals exhibited pronounced circling behaviour. Our results therefore directly confirm that motion vision is necessary to fly straight under realistic conditions.

In-Bore Yaw Effects on Lateral Throw-off and Aerodynamic Jump Behavior for Small Caliber Projectiles Firing Sidewise From Air Vehicles

2011 ◽  
Vol 78 (5) ◽  
Author(s):  
Dimitrios N. Gkritzapis ◽  
Elias E. Panagiotopoulos
Keyword(s):  
Motion Analysis ◽  
Mass Distribution ◽  
Simulation Modeling ◽  
Flight Simulation ◽  
Weapon System ◽  
Flight Trajectory ◽  
Free Flight ◽  
Air Vehicles

The present study investigates the effects of in bore-yaw phenomenon on lateral throw-off and aerodynamic jump behavior for small caliber rotational symmetric (both in configuration and mass distribution) projectiles launched horizontally at supersonic firing speeds and various altitudes from high-subsonic air vehicles. The ammunition used is the caliber .50 API M8 bullet type firing from M2 machine automatic gun. The projectile is considered to be eccentrically engraved, tilted as it enters the rifling, and it is assumed that the tilt persists throughout its passage through the rifled barrel of the used weapon system. The modified linear 6-DOF flight simulation modeling is applied for the bullet free-flight trajectory predictions. The coupled epicyclic pitching and yawing motion analysis for the first 100 m of the examined trajectories are taken into account.

scholarly journals Synthesis of conflict-free aircraft flight trajectories using multi-criteria dynamic programming

Aviation ◽  
2017 ◽  
Vol 21 (2) ◽  
pp. 35-41
Author(s):  
Volodymyr KHARCHENKO ◽  
Denys VASYLIEV ◽  
Volodymyr VASYLIEV
Keyword(s):  
Computer Simulation ◽  
Dynamic Programming ◽  
Optimal Trajectory ◽  
Flight Trajectory ◽  
Free Flight ◽  
Potential Conflict ◽  
Aircraft Flight ◽  
Conflict Situations ◽  
Flight Trajectories ◽  
Selection Of

The paper discusses the problem of flight trajectory synthesis that is conducted to prevent potential conflict situations between two aircraft in air traffic. A method of multi-objective sequential synthesis of conflict-free flight trajectories is developed. This method provides the synthesis of Pareto conflict-free trajectories using multi-criteria dynamic programming and selection of the optimal trajectory. The paper also considers the principles of discretization concerning states and controls to apply dynamic programming. An analysis of the proposed method is performed using computer simulation.

Flight trajectory simulation of fluid payload projectiles

1986 ◽  
Vol 9 (2) ◽  
pp. 213-220 ◽  
Author(s):  
Harold R. Vaughn ◽  
Walter P. Wolfe ◽  
William L. Oberkampf
Keyword(s):  
Flight Trajectory ◽  
Trajectory Simulation
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