The Experts below are selected from a list of 6939 Experts worldwide ranked by ideXlab platform

Aneli Bongers - One of the best experts on this subject based on the ideXlab platform.

  • learning and forgetting in the jet Fighter Aircraft industry
    PLOS ONE, 2017
    Co-Authors: Aneli Bongers
    Abstract:

    A recent strategy carried out by the Aircraft industry to reduce the total cost of the new generation Fighters has consisted in the development of a single airframe with different technical and operational specifications. This strategy has been designed to reduce costs in the Research, Design and Development phase with the ultimate objective of reducing the final unit price per Aircraft. This is the case of the F-35 Lightning II, where three versions, with significant differences among them, are produced simultaneously based on a single airframe. Whereas this strategy seems to be useful to cut down pre-production sunk costs, their effects on production costs remain to be studied. This paper shows that this strategy can imply larger costs in the production phase by reducing learning acquisition and hence, the total effect on the final unit price of the Aircraft is indeterminate. Learning curves are estimated based on the flyaway cost for the latest three Fighter Aircraft models: The A/F-18E/F Super Hornet, the F-22A Raptor, and the F-35A Lightning II. We find that learning rates for the F-35A are significantly lower (an estimated learning rate of around 9%) than for the other two models (around 14%).

  • learning and forgetting in the jet Fighter Aircraft industry
    Research Papers in Economics, 2017
    Co-Authors: Aneli Bongers
    Abstract:

    A recent strategy carried out by the Aircraft industry to reduce the total cost of new generation Fighter has consisted in the development of a single airframe with different technical and operational specifications. This strategy has been designed to reduce costs in the Research, Design, and Development phase with the aim of reducing the final unitary price of Aircraft. This is the case of the F-35 Lightning II, where three versions, with significant differences among them, are produced simultaneously based on a single airframe. Whereas this strategy seems to be useful to reduce pre-production sunk costs, remains key to study their effects on production costs. This paper shows that this strategy can imply larger costs in the production phase by reducing learning acquisition and hence, the total effect on the final unitary price of the Aircraft is indeterminate. Learning curves are estimated based on the flyaway cost for the latest three Fighter Aircraft models: The A/F-18E/F Super Hornet, F-22A Raptor, and the F-35A Lightning II. We find that learning rates for the F-35A are significantly lower (an estimated learning rate around 9%) than for the other two models (around 14%).

  • measuring technological trends a comparison between u s and u s s r russian jet Fighter Aircraft
    Technological Forecasting and Social Change, 2014
    Co-Authors: Aneli Bongers, Jose L Torres
    Abstract:

    Abstract Measuring and forecasting technological change is a crucial issue from various points of view. This is particularly important in the case of weapon systems as this would enable technological performance and operational capabilities to be assessed in relation to potential threats. This paper measures and compares technological trends in U.S. and Soviet Union/Russian jet Fighter Aircraft by estimating the relationship between the first flight date and a set of performance and technical characteristics of these Aircraft. From the point of view of technological advantage, we find that U.S. jet Fighters were, on average, approximately 2 years ahead of the former Soviet Union/Russian jet Fighters during the entire jet Fighter era. Nevertheless, the technological advantage has swung from one side to the other during specific periods as particular models have been introduced. Finally, the development of 5th-generation jet Fighters, in particular the development of the F-22 Raptor, has placed American technology about 20 years ahead of Russian technology, a difference that has never occurred before. This finding casts doubt on the ability of Russia, as the inheritor of the former Soviet Union Aircraft industry, to match American technological progress in jet Fighter Aircraft.

Andreas Knauf - One of the best experts on this subject based on the ideXlab platform.

  • design and robustness analysis of Fighter Aircraft flight control laws
    European Journal of Control, 2006
    Co-Authors: Jeanmarc Biannic, Clement Roos, Andreas Knauf
    Abstract:

    In this paper, a complete methodology is detailed for the design and analysis of robust gain-scheduled Fighter Aircraft flight control laws. The proposed approach consists of three steps. A set of locally robust controllers is first generated using LMI optimization. The global controller is then obtained by a standard linear interpolation and transformed into LFT format. Finally, a validation step is achieved using both LTI and LTV analysis techniques, for which specific methods and tools have been developed.

Jeanmarc Biannic - One of the best experts on this subject based on the ideXlab platform.

B H K Lee - One of the best experts on this subject based on the ideXlab platform.

  • vertical tail buffeting of Fighter Aircraft
    Progress in Aerospace Sciences, 2000
    Co-Authors: B H K Lee
    Abstract:

    Abstract Vertical tail buffeting at high angles of attack is a phenomenon associated with the impact of vortical flows generated by the Aircraft on the fins. This poses a serious problem for both single- and twin-tail Fighter Aircraft from the point of view of combat maneuverability and structural integrity. The research activities to understand the flow physics with an aim to alleviate buffet loads were quite intense during the period from the late 1970s to the early 1990s. Most of the investigations were carried out on the F/A-18 mainly because of two international programs involving countries that operate the F/A-18 in their air force. This review begins with a description of the water tunnel experiments showing some flow visualization results of the leading-edge extension (LEX) burst vortical flows. Wind tunnel studies on a 1/9 scale F/A-18 model in Australia, a 1/6.65 scale model in the United Kingdom, a 6% scale model in Canada, 12%, 16% and full-scale models in the United States are summarized. Scale effects can be deduced from the various sub- and full-scale models tested. Flight test results conducted on the High Alpha Research Vehicle in the United States and on an instrumented CF-18 test Aircraft in Canada are presented. The accuracy of analytical methods utilizing wind tunnel data to predict buffet loads at flight conditions is discussed. The use of CFD to compute vertical fin buffeting is challenging and requires a large amount of computing power. A brief exposure to the methodology is given and results from the only available computational case study carried out by NASA Ames are compared with wind tunnel and flight test data. A short introduction to statistical non-stationary effects is given. Hysteresis effect of the LEX vortex burst on the buffet loads is discussed, and a statistical non-stationary buffet prediction method is outlined. This review provides a useful reference to the results collected from the High Alpha Technology Program, The Technical Cooperation Program and the International Follow-On Structural Test Project which together form an extremely valuable data base for vertical tail buffeting studies.

Richardson Casey - One of the best experts on this subject based on the ideXlab platform.

  • Examination of Factors Related to Pilot Acceptance Behaviors toward the Automatic Ground Collision Avoidance System in Fighter Aircraft Operations
    SelectedWorks, 2019
    Co-Authors: Richardson Casey, Truong Dothang, Choi Woojin
    Abstract:

    Objective: This research aimed to explore an application of the technologyacceptance model (TAM) to integration of the automatic ground collisionavoidance system (AGCAS) in Fighter Aircraft operations to gain a betterunderstanding of the pilots’ acceptance behavior with respect to a highlevelautomated system.Background: AGCAS has been deployed to prevent loss of F-16 Fightersfrom ground collision using a high-level automation design capable ofaltering the Aircraft’s flight control system independent of pilot action.Understanding pilots’ acceptance behavior with respect to the systemcould allow future stakeholders to make reasonable inferences aboutsome factors that are important to achieving positive pilot acceptance ofhighly automated Aircraft systems.Method: Using data from a survey of active-duty U.S. Air Force F-16 operationalFighter pilots (N = 142), an AGCAS-specific TAM was analyzed usingthe structural equation modeling method.Results: This study indicated that perceived ease of use had a significant, butonly medium-sized relationship with perceived usefulness. The other resultwas that perceived usefulness has a strong relationship with usage behavior.Conclusion: This study demonstrated the potential utility of a model fortechnology acceptance tailored to explain user acceptance behavior withrespect to a high-level Fighter Aircraft automated collision avoidance system

  • Applications of the Technology Acceptance Model to Integration of the Automatic Ground Collision Avoidance System in Fighter Aircraft Operations
    SelectedWorks, 2017
    Co-Authors: Richardson Casey, Truong Dothang, Vincenzi, Dennis A., Stolzer, Alan J., Friend, Mark A., Ho Nhut, Hickey, Michael P.
    Abstract:

    The leading cause of F-16 Fighter Aircraft and Fighter pilot losses results from ground collisions. In an effort to curb this hazard, an automatic ground collision avoidance system (AGCAS) was formally fielded for use in routine U.S. Air Force active-duty F-16 operations in 2014. AGCAS uses a high-level automation design capable of altering the Aircraft\u27s flight control system independent of pilot action. This study explored an application of the Technology Acceptance Model (TAM) to integration of the automatic ground collision avoidance system (AGCAS) in Fighter Aircraft operations. Using data from a survey of active-duty U.S. Air Force F-16 operational F-16 Fighter pilots (n=142), collected shortly after initial AGCAS fielding, an AGCAS-specific TAM was analyzed using the structural equation modeling technique. Hypotheses described the relationships between an AGCAS-TAM\u27s latent variables: AGCAS perceived usefulness, AGCAS perceived ease of use, and AGCAS usage behavior. The results provided evidence of the validity and utility of an AGCAS-TAM to user acceptance of high-level automation in Fighter Aircraft operations

  • Applications of the Technology Acceptance Model to Integration of the Automatic Ground Collision Avoidance System in Fighter Aircraft Operations
    Scholarly Commons, 2017
    Co-Authors: Richardson Casey
    Abstract:

    The leading cause of F-16 Fighter Aircraft and Fighter pilot losses is ground collisions. In an effort to curb this hazard, an automatic ground collision avoidance system (AGCAS) was formally fielded for use in routine U.S. Air Force active-duty F-16 operations in 2014. AGCAS uses a high-level automation design capable of altering the Aircraft’s flight control system independent of pilot action. This study explored an application of the Technology Acceptance Model (TAM) to integration of the AGCAS in Fighter Aircraft operations. Using data from a survey of active-duty U.S. Air Force F-16 operational Fighter pilots (n=142), collected shortly after initial AGCAS fielding, an AGCAS-specific TAM was analyzed using the structural equation modeling technique. Hypotheses describing the relationships between an AGCAS-TAM’s latent variables: AGCAS perceived usefulness, AGCAS perceived ease of use, and AGCAS usage behavior. The results provided evidence of the validity and utility of an AGCAS-TAM to user acceptance of high-level automation in Fighter Aircraft operations