Challenges and Emerging Trends in Store Separation Engineering: An Air Force SEEK EAGLE Office Perspective

Perillo, Stephen; Atkins, D J; Roberts, William

doi:10.2514/6.2009-101

Cited by 6 publications

(8 citation statements)

References 2 publications

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“…Since there is severely nonlinear aerodynamic interference between the separated components, the trajectories of these separated components are complicated and thus difficult to predict, which may pose serious threat to flight safety [1,2]. Accordingly, it is of high importance to regard behaviors of the objects released from an aircraft to ensure the flight safety and accurate arrival of the munitions at the target.…”

Section: Introductionmentioning

confidence: 99%

Effect of elastic deformation on the trajectory of aerial separation

Hua

Zhao

et al. 2015

Aerospace Science and Technology

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Section: Introductionmentioning

confidence: 99%

Effect of elastic deformation on the trajectory of aerial separation

Hua

Zhao

et al. 2015

Aerospace Science and Technology

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“…Store separation is a strategic and complex process for all nations [1]. Aircraft-store separation is an old concept; however, the calculation of the store trajectory accuracy during the separation from an aircraft is more recent [2].…”

Section: Introductionmentioning

confidence: 99%

“…In some situations, the flight test engineer estimates the effort required to obtain an airworthiness certification for the aircraft-store configuration [5]. These are (1) development and certification of new aircraft and defense systems…”

Section: Introductionmentioning

confidence: 99%

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Store Separation: Photogrammetric Solution for the Static Ejection Test

Vasconcelos

Leite²,

Kusumoto³

et al. 2019

International Journal of Aerospace Engineering

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The process of developing and certifying aircraft and aeronautical systems requires the execution of experimental flight test campaigns to determine the actual characteristics of the system being developed and/or validated. In this process, there are many campaigns that are inherently dangerous, such as the store separation. In this particular case, the greatest risk is the collision of the store with the fuselage of the aircraft. To mitigate the risks of this campaign, it is necessary to compare the actual trajectory of a separation with its simulated estimates. With such information, it is possible to decide whether the next store release can be done with the required safety and/or whether the model used to estimate the separation trajectory is valid or not. Consequently, exact determination of the trajectory of the separation is necessary. Store separation is a strategic, relevant, and complex process for all nations. The two main techniques for determining the quantitative store trajectory data with 6DoF (six degrees of freedom) are photogrammetry and instrumented telemetry packages (data obtained from inertial sensors that are installed in the store). Each presents advantages and disadvantages. In regard to photogrammetry, several market solutions can be used to perform these tests. However, the result of the separation trajectory is only obtained after the test flight, and therefore, it is not possible to safely carry out more than one on the same flight. In this context, the development and validation of a solution that will allow the realization of near real-time separation analysis are in fact an innovative and original work. This paper discusses the development and validation, through actual static ejection tests, of the components that will compose a new onboard optical trajectory system for use in store separation campaigns. This solution includes the implementation of a three-dimensional (3D) calibration field that allows calibration of the optical assembly with just one photo per optical assembly, development of a complete analytical model for camera calibration, and development of specific software for identification and tracking of targets in two-dimensional (2D) coordinate images and three-dimensional (3D) coordinate trajectory calculation. In relation to the calibration, the analytical model is based on a pinhole type camera and considers its intrinsic parameters. This allowed for a mean square error smaller than ±3.9 pixels @1σ. The 3D analysis software for 6DoF trajectory expression was developed using photogrammetry techniques and absolute orientation. The uncertainty associated with the position measurement of each of the markers varies from ±0.02 mm to ±8.00 mm @1σ, depending on the geometry of the viewing angles. The experiments were carried out at IPEV (Flight Test Research Institute)/Brazil, and the results were considered satisfactory. We advocate that the knowledge gained through this research contributes to the development of new methods that permit almost real-time analysis in store separation tests.

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“…Berglind and Tysell 15 have carried out the store separation studies including the aircraft manoeuvre and they have observed that the store separation is safer during manoeuvre due to the simultaneous movement of the air vehicle away from the store and the fact that the influence on the trajectory is weak. Perillo and Atkins 16 have pointed out that there is a growing importance of store separation studies due to rapidly diminishing store size and weight but increased store complexity and often less stable configuration. Kapulu and Tekinalp 17 presented simulation results to predict the behaviour of stores after being released from a helicopter.…”

Section: Introductionmentioning

confidence: 99%

Separation Dynamics of Air-to-Air Missile and Validation with Flight Data

et al. 2017

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Prediction of flight characteristics of a store in the vicinity of an aircraft is vitally important for ensuring the safety of the aircraft and effectiveness of the store to meet the mission objective. Separation dynamics of an agile air-to-air-Missile from a fighter aircraft is numerically simulated using an integrated store separation dynamics suite. Chimera cloud of points along with a grid-free Euler solver is used to obtain aerodynamic force on the missile and the force is integrated using a rigid body dynamics code to obtain the missile position. In the present work, the suite is applied to a flight test case and sensitivity of trajectory variables on launch parameters is studied. Further, the results of the suite are compared with the flight data. The predicted body rates and Euler angles of missile compare well with the flight data.

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Challenges and Emerging Trends in Store Separation Engineering: An Air Force SEEK EAGLE Office Perspective

Cited by 6 publications

References 2 publications

Effect of elastic deformation on the trajectory of aerial separation

Effect of elastic deformation on the trajectory of aerial separation

Store Separation: Photogrammetric Solution for the Static Ejection Test

Separation Dynamics of Air-to-Air Missile and Validation with Flight Data

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