CHAFF Code Simulation of Countermeasures Dispersal

    Recent work at CDI saw the development of a Windows-based software model denoted CHAFF under U. S. Air Force sponsorship. This model permits the use of pre-stored velocity fields (calculated by codes such as CHARM or FPV, though any full-aircraft flow field model can be used) to compute the dispersion of countermeasures from user-selected locations on an aircraft with a predetermined initial force and scatter from the dispenser pyrotechnics. Figure 1 captures the CHAFF program main input screen for typical Air Force airframes (here an F-15 and a C-130), as well as sample concentration plot screens from the model for a simple chaff release scenario (Figure 2). The model can also compute the effective radar cross section of the released chaff cloud. Given suitable input information about the vehicle airframe, the location of release devices for countermeasures and stores (e.g., chaff, flares, markers, and sonobuoys), and aerodynamic and inertial properties of the released objects, CHAFF provides a framework for computation of the time history of the objects relative to the aircraft.

Figure 1: CHAFF program main screens for the F-15 and the C-130.

Figure 2: Sample result for the first 1.25 sec. of a C-130 chaff release event.

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