Accession Number : ADP006486

Title :   The Development of a Requirement Specification for an Experimental Active Flight Control System for a Variable Stability Helicopter - An Ada Simulation in JSD,

Corporate Author : ROYAL AEROSPACE ESTABLISHMENT BEDFORD (UNITED KINGDOM)

Personal Author(s) : Padfield, Gareth D. ; Bowater, Stephen P.

Report Date : SEP 1991

Pagination or Media Count : 13

Abstract : In the field of helicopter flight control and handling qualities, the potential benefits offered by Active Control Technology are considerable. To support the development of appropriate handling criteria and carefree manoeuvring features, the UK Royal Aerospace Establishment has been engaged in the development of an ACT system for a research Lynx. As currently envisaged the system includes full authority fly by wire actuation and fail-operate / fail-safe hardware architecture. The impact of the required functionality on the system requirements dictated a need for a precise yet versatile specification of the system, and Jackson System Development (JSD) was selected as a design method since it provides a formal modelling of the pilot interface, and also operates at a sufficient level of detail necessary to ensure completeness and resolution of ambiguities. The tools which support JSD include automatic code generation, and for this work were further developed to accommodate changes to system architecture in an efficient manner. The code produced provides a direct simulation of the design and results in a living specification available for validation and investigation of the written specification.

Descriptors :   *COMPUTERIZED SIMULATION, *FLIGHT CONTROL SYSTEMS, *SOFTWARE ENGINEERING, ACTUATION, ARCHITECTURE, AUTOMATIC, BENEFITS, CONTROL, FAIL SAFE, FLIGHT, HANDLING, HELICOPTERS, IMPACT, INTERFACES, PILOTS, REQUIREMENTS, RESOLUTION, SIMULATION, SPECIFICATIONS, TOOLS, VALIDATION, WIRE, WORK, ADA PROGRAMMING LANGUAGE, VARIABLE STABILITY AIRCRAFT.

Subject Categories : Computer Programming and Software
      Flight Control and Instrumentation
      Helicopters

Distribution Statement : APPROVED FOR PUBLIC RELEASE