Browsing by Author "Dadswell, Christopher"

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    Case studies to illustrate the rotorcraft certification by simulation process; CS 29/27 category A rejected take-off, confined area
    (German Society for Aeronautics and Astronautics (DGLR: Deutsche Gesellschaft für Luft- und Raumfahrt), 2023-09-07) White, Mark D.; Dadswell, Christopher; Padfield, Gareth D.; van’t Hoff, Stefan; Bakker, Richard; Lu, Linghai; Quaranta, Giuseppe; Podzus, Philipp
    This paper is one of a set presented at the 49th European Rotorcraft Forum discussing results from the EU Clean Sky 2 project, Rotorcraft Certification by Simulation (RoCS). The process developed by the RoCS team provides guidance on the use of flight simulation in certification and features four case studies that illustrate aspects of the process applied using flight simulation models and flight test data provided by Leonardo Helicopters. This paper presents the case study for Rejected Take-Off (RTO): Category A in a Confined Area, for the relevant certification paragraphs in the EASA Certification Specifications CS-27 and CS-29. The relevant paragraphs from the Specifications are described and results from simulation model fidelity assessment, and updating compared with test data, are presented for a reference flight condition. Results from piloted simulation trials, with a ‘new’ Flight Test Manoeuvre (FTM), are included to illustrate flight simulator fidelity assessment methods and to illustrate how the Rotorcraft Certification by Simulation process can be achieved.
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    Case studies to illustrate the rotorcraft certification by simulation process; CS 29/27 dynamic stability requirements
    (German Society for Aeronautics and Astronautics (DGLR: Deutsche Gesellschaft für Luft- und Raumfahrt), 2023-09-07) Lu, Linghai; Padfield, Gareth D.; White, Mark D.; Dadswell, Christopher; Quaranta, Giuseppe; van’t Hoff, Stefan; Podzus, Philipp
    This paper is one of a set presented at the 49th European Rotorcraft Forum displaying results from the EU Clean Sky 2 project, Rotorcraft Certification by Simulation (RoCS). The process developed by the RoCS team provides guidance on the requirements for the use of simulation in certification and features four case studies that illustrate aspects of the process applied using flight simulation models and flight test data provided by Leonardo Helicopters. This paper presents the case study on Dynamic Stability, for the relevant certification paragraphs in the EASA Certification Specifications CS-27 and CS-29. The Dynamic Stability paragraphs from the Specifications are described and results from simulation model fidelity assessment, and updating compared with test data, are presented for a reference flight condition. The credibility of extrapolations of the flight simulation model results to conditions at higher altitude, different airspeeds and vertical rates of climb are then discussed. Preliminary results from piloted simulation trials, with a ‘new’ flight test manoeuvre, are included to illustrate flight simulator fidelity assessment methods and to explore the veracity of the stability margins set by the Certification Specifications.
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    Case studies to illustrate the rotorcraft certification by simulation process; CS 29/27 low-speed controllability
    (German Society for Aeronautics and Astronautics (DGLR: Deutsche Gesellschaft für Luft- und Raumfahrt), 2023-09-07) van’t Hoff, Stefan; White, Mark D.; Dadswell, Christopher; Lu, Linghai; Padfield, Gareth D.; Quaranta, Giuseppe; Podzus, Philipp
    This paper is one of a set presented at the 49th European Rotorcraft Forum discussing results from the EU Clean Sky 2 project, Rotorcraft Certification by Simulation (RoCS). The process developed by the RoCS team provides guidance on the use of flight simulation in certification and features four case studies that illustrate aspects of the process using flight simulation models and flight test data provided by Leonardo Helicopters. This paper presents the case study for the low-speed controllability requirements from the relevant certification paragraphs in the EASA Certification Specifications CS-27 and CS-29. Following an introduction of the related specifications, and the motivation behind seeking compliance supported by simulation, the various phases of the RCbS process are explored in more detail. The intent is to exercise aspects of the RoCS guidance in a practical application to investigate the implementation, and the strengths and limitations, given real-world constraints. Emphasis is placed on the Validation & Verification as well as the Credibility Assessment, taking into account test and simulation uncertainties. Results from piloted simulation trials are included to illustrate possible flight simulator fidelity assessment methods.