CH-53K Control Laws: Risk Reduction Flight Testing
Notice bibliographique
Résumé
The US Navy has contracted Sikorsky Aircraft to develop a heavy lift replacement helicopter. The CH-53K employs Model Following control laws which can provide Level 1 handling qualities in accordance with ADS-33E-PRF across the flight envelope. The core controls include a Primary Flight Control System (PFCS) and an Automatic Flight Control System (AFCS). The PFCS provides a Rate Command Attitude Hold (RCAH) system which provides the pilot with a responsive aircraft for operations in good visual environments. The AFCS implements an Attitude Command Velocity Hold system with Hover and Position hold features for operations in degraded visual environments (DVE). Radar and Barometric Altitude hold is also available, and a comprehensive set of flight director modes is also being implemented. Once the basic structure of the control laws was set, Sikorsky embarked on a very extensive design and analysis effort to ensure that the control laws were on the path to producing Level 1 handling qualities. A key element of the design effort is to carry out extensive risk reduction flight testing on one or more variable stability aircraft. This is expected to go a long way towards reducing flight controls flight test cost risk as part of the CH-53K System Design and Development program. The intent of this effort is to functionally test all PFCS, AFCS and Tactile Cueing functions on a combination of the National Research Council of Canada's (NRC) Bell 412 ASRA variable stability aircraft, and the US Army Aeroflightdynamics Directorate's JUH-60A RASCAL variable stability aircraft. This paper focuses on the approximately 60 flight hours of testing of the CH-53K PFCS and AFCS functions that was carried out between December 2009 and December 2010 on the NRC ASRA aircraft in Ottawa, Canada. A unique feature of the implementation carried out for this effort is the two step process, where first the open loop characteristics of the CH-53K aircraft were simulated on the host aircraft and then the model following loop was closed around the simulated dynamics. Once the open loop characteristics had been implemented, the complete PFCS and AFCS control laws for the pitch, roll and yaw axes were wrapped around these simulated characteristics. Extensive testing was carried out in May and June 2010 for the PFCS control laws and in November and December 2010 for the AFCS control laws. While formal handling qualities ratings were not collected, extensive evaluations were carried out using ADS-33 type MTEs by a combination of Sikorsky and US Navy pilots in order to shakedown the control implementation and find any issues ahead of implementation on a real aircraft. As a result of the risk reduction flight testing significant changes were made to the control laws and this test program is estimated to have avoided a significant number of flight test hours during the upcoming CH-53K test program with the prototype aircraft. Copyright ©2011 by the American Helicopter Society International, Inc. All rights reserved.
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
Comment cette classification a été obtenuedéplier
Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».