Store Separation: Photogrammetric Solution for the Static Ejection Test
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, suc...
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2019-01-01
|
| Series: | International Journal of Aerospace Engineering |
| Online Access: | http://dx.doi.org/10.1155/2019/6708450 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832561934369554432 |
|---|---|
| author | Luiz Eduardo Guarino de Vasconcelos Nelson Paiva Oliveira Leite André Yoshimi Kusumoto Leandro Roberto Cristina Moniz Araujo Lopes |
| author_facet | Luiz Eduardo Guarino de Vasconcelos Nelson Paiva Oliveira Leite André Yoshimi Kusumoto Leandro Roberto Cristina Moniz Araujo Lopes |
| author_sort | Luiz Eduardo Guarino de Vasconcelos |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-c0eb08513b91458f94c506377746f4d7 |
| institution | Kabale University |
| issn | 1687-5966 1687-5974 |
| language | English |
| publishDate | 2019-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Aerospace Engineering |
| spelling | doaj-art-c0eb08513b91458f94c506377746f4d72025-02-03T01:23:56ZengWileyInternational Journal of Aerospace Engineering1687-59661687-59742019-01-01201910.1155/2019/67084506708450Store Separation: Photogrammetric Solution for the Static Ejection TestLuiz Eduardo Guarino de Vasconcelos0Nelson Paiva Oliveira Leite1André Yoshimi Kusumoto2Leandro Roberto3Cristina Moniz Araujo Lopes4Instituto Tecnológico de Aeronáutica (ITA), BrazilInstituto de Pesquisas e Ensaios em Voo (IPEV), BrazilInstituto de Pesquisas e Ensaios em Voo (IPEV), BrazilInstituto de Estudos Avançados (IEAV), BrazilInstituto Tecnológico de Aeronáutica (ITA), BrazilThe 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.http://dx.doi.org/10.1155/2019/6708450 |
| spellingShingle | Luiz Eduardo Guarino de Vasconcelos Nelson Paiva Oliveira Leite André Yoshimi Kusumoto Leandro Roberto Cristina Moniz Araujo Lopes Store Separation: Photogrammetric Solution for the Static Ejection Test International Journal of Aerospace Engineering |
| title | Store Separation: Photogrammetric Solution for the Static Ejection Test |
| title_full | Store Separation: Photogrammetric Solution for the Static Ejection Test |
| title_fullStr | Store Separation: Photogrammetric Solution for the Static Ejection Test |
| title_full_unstemmed | Store Separation: Photogrammetric Solution for the Static Ejection Test |
| title_short | Store Separation: Photogrammetric Solution for the Static Ejection Test |
| title_sort | store separation photogrammetric solution for the static ejection test |
| url | http://dx.doi.org/10.1155/2019/6708450 |
| work_keys_str_mv | AT luizeduardoguarinodevasconcelos storeseparationphotogrammetricsolutionforthestaticejectiontest AT nelsonpaivaoliveiraleite storeseparationphotogrammetricsolutionforthestaticejectiontest AT andreyoshimikusumoto storeseparationphotogrammetricsolutionforthestaticejectiontest AT leandroroberto storeseparationphotogrammetricsolutionforthestaticejectiontest AT cristinamonizaraujolopes storeseparationphotogrammetricsolutionforthestaticejectiontest |