Beggar Code Implementation of the (6+)DOF Capability for Stores with Moving Components

Rizk, Magdi; Lee, Jae

doi:10.2514/6.2004-1251

Cited by 14 publications

(4 citation statements)

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“…These models may include aircraft maneuvering, ejector performance, 1, 2 constraint mechanisms such as rails or pivots, 3 aerodynamic effects, 4 configuration changes such as deploying wings or fins, 5 and control surface deflections. 6 The rigorous development of each of these models is beyond the scope of the present work; instead, emphasis will be placed primarily on rigid body dynamics and flight test validation.…”

Section: Overviewmentioning

confidence: 99%

“…At least one effort has been made to take the aerodynamic and inertial changes into consideration. 5 For simplicity of the current development, the inertia properties will be assumed constant. This is considered a justified assumption due to (1) the short time duration of interest for store separation (approximately 1 sec) and (2) the relatively minor effect on the equations of motion due to inherently small mass of the control surfaces compared to the store itself.…”

Section: Iib Coordinate Free Equations Of Motionmentioning

confidence: 99%

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Store Separation Equations of Motion

CarterAir

2012

AIAA Atmospheric Flight Mechanics Conference

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Combat aircraft utilize expendable stores such as missiles, bombs, flares, and external tanks to execute their missions. Safe and acceptable separation of these stores from the parent aircraft is essential for meeting the mission objectives. The equations of motion for a store in free flight are similar to the conventional aircraft flight dynamics equations prevalent in the literature. However, a careful distinction is necessary due to the relative motion of two neighboring bodies. Of specific interest is the store motion relative to the aircraft; knowledge of which is necessary for modeling the aerodynamic interaction between the store and aircraft. This paper presents an in depth development of the store separation equations of motion with particular emphasis on the motion of the store relative to the parent aircraft. The same framework is used to derive the kinematic differential equations used for flight test trajectory reconstruction based on inertial measurements. The relationship between trajectory reconstruction and the equations of motion leads to a method for estimating the aerodynamic forces and moments directly from flight test data. An example based on separation of a representative store from an F-16 aircraft is presented to demonstrate the efficacy of store separation trajectory prediction and trajectory reconstruction. I. OverviewMathematical modeling and simulation (M&S) is used to reduce the risk, cost, and schedule of aircraftstores compatibility efforts and provides a valuable toolset for the practicing store separation engineer. In a general store separation program, M&S will be used to develop a streamlined and cost-effective wind tunnel test, perform sensitivity and uncertainty analyses to determine best and worst-case predicted outcomes, down select to configurations and flight conditions of interest for flight test, assess the risk of each individual flight test event, and ultimately provide a certification recommendation to the authorizing agency for operational use. A central component of M&S necessary for trajectory prediction is the formulation of the store separation equations of motion.Trajectory prediction involves statement of the rigid body equations of motion and development of mathematical models for each of the relevant components that influence the store during separation. These models may include aircraft maneuvering, ejector performance, 1, 2 constraint mechanisms such as rails or pivots, 3 aerodynamic effects, 4 configuration changes such as deploying wings or fins, 5 and control surface deflections. 6 The rigorous development of each of these models is beyond the scope of the present work; instead, emphasis will be placed primarily on rigid body dynamics and flight test validation. The store separation equations of motion are derived in Section II and the same framework is extended to reconstruction of flight test trajectories in Section III. II. Store Separation Equations of MotionMathematical modeling of store separation is accomplished by dividing the separation event ...

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Section: Overviewmentioning

confidence: 99%

Section: Iib Coordinate Free Equations Of Motionmentioning

confidence: 99%

Store Separation Equations of Motion

CarterAir

2012

AIAA Atmospheric Flight Mechanics Conference

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“…구속조건이 있는 운동방정식 해 석은 날개전개를 동반한 외부장착물의 분리 해석 에도 사용될 수 있다 [3]. 그러므로 다양한 종류의 외부장착물 분리해석을 위해서는 구속조건이 있 는 운동방정식을 해석할 수 있는 프로그램의 개 발이 필수적이다 [4].…”

Section: ⅰ 서 론unclassified

Development of Multi-body Dynamics Analysis Program with Constraints using CFEM

Park¹,

Lee²

2012

Journal of the Korean Society for Aeronautical & Space Scie

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“…[1,2] Beggar has a unique, user-friendly grid assembly process that utilizes the latest developments in overset grid technology. In Beggar, the flow solver is tightly coupled with a multiple degree-of-freedom (6+DOF) algorithm.…”

Section: Introductionmentioning

confidence: 99%

Applied Computational Fluid Dynamics in Support of Aircraft/Store Compatibility and Weapons Integration

Keen

2006

2006 HPCMP Users Group Conference (HPCMP-UGC'06)

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The Air Force SEEK EAGLE Office (AFSEO), Eglin Air Force Base (AFB), FL, is the United States Air Force (USAF) authority for weapons certification efforts. AFSEO performs test and evaluation for aircraft/store compatibility certification.Computational Fluid Dynamics (CFD) is employed to support this process. Determining the flow about an aircraft/store combination may be extremely difficult.Complicated geometry features such as pylons, launchers, grid fins, and internal weapons bays create severe aerothermodynamic and acoustic environments which are challenging to simulate numerically.Rapidly and accurately modeling the trajectory of store separation in a high-volume simulation environment presents an additional challenge. The USAF requirement for numerous, simultaneous and quickreaction solutions for a wide variety of stores and aircraft can only be accomplished through application of parallel high-performance computing resources that meet the significant computational and memory demands associated with the certification computational environment.Before operational use, all aircraft/store configurations must be certified for safe loading, carriage, and jettison/release. AFSEO provides flight certification recommendations which are based on combinations of engineering analysis, ground, and flight testing. Engineering analyses is provided by disciplines in carriage loads, store separations, flutter, ballistics, stability and control, and electromagnetic compatibility and interference.The AFSEO Computational Aeromechanics Team (CAT) provides time-critical CFD support for engineering analyses to optimize ground and flight testing. This contribution takes the form of carriage aerodynamic loads, store separation predictions, and visualized flow field physics. The knowledge created reduces risk, lowers cost, and speeds the fielding of new weapons. This paper discusses four of the most recently applied AFSEO CFD tasks related to specific aircraft/store investigations and certifications.

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Beggar Code Implementation of the (6+)DOF Capability for Stores with Moving Components

Cited by 14 publications

References 0 publications

Store Separation Equations of Motion

Store Separation Equations of Motion

Development of Multi-body Dynamics Analysis Program with Constraints using CFEM

Applied Computational Fluid Dynamics in Support of Aircraft/Store Compatibility and Weapons Integration

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