Accession Number:

ADA537085

Title:

CADAC: Multi-use Architecture for Constructive Aerospace Simulations (PREPRINT)

Descriptive Note:

Electronic preprint

Corporate Author:

AIR FORCE RESEARCH LAB EGLIN AFB FL

Personal Author(s):

Report Date:

2011-01-01

Pagination or Media Count:

19.0

Abstract:

In todays network-centric world, aerospace vehicles interact with many objects. They navigate by overhead satellites, synchronize their flight paths with other vehicles, swarm over hostile territory and attack multiple targets. Studying these engagements with high-fidelity constructive simulations has become an important task of modeling and simulation MS. The simulation framework Computer Aided Design of Aerospace Concepts CADAC has its roots in FORTRAN code that dates back to the 1960s and was used by industry and the U.S. Air Force to simulate aerospace vehicles in all flight environments. To adapt CADAC to the new environment, a complete rewrite was carried out in C, taking advantage of object-oriented programming techniques. The architecture of CADAC is based on the hierarchical structure of inherited classes. The vehicles aircraft, missiles, satellites or ground targets, inherit the six-degree-of-freedom 6-DoFequations of motion from the classes Flat6 or Round6, conveying either the flat or elliptical Earth model. In turn, these classes inherit the communication structure from the base class Cadac. The components of the vehicle, e.g., aerodynamics, propulsion and autopilot, are represented by modules, which are member functions of the vehicle class. Communication among the modules occurs by protected module-variable arrays. Every instantiated vehicle object is encapsulated with its methods and data. To communicate between vehicles, data packets are loaded onto a global data bus for recall by other vehicles. Input occurs by ASCII file and output is compatible with CADAC Studio, a plotting and data processing package. CADAC is chiefly an engineering tool for refining the components of the primary vehicle and exploring its performance as it interacts possibly repeatedly instantiated with the multi-object environment. Its modular structure enables reuse of component models across simulations.

Subject Categories:

  • Computer Programming and Software
  • Manufacturing and Industrial Engineering and Control of Production Systems

Distribution Statement:

APPROVED FOR PUBLIC RELEASE