52 research outputs found

    Multiaxis thrust vectoring using axisymmetric nozzles and postexit vanes on an F/A-18 configuration vehicle

    Get PDF
    A ground-based investigation was conducted on an operational system of multiaxis thrust vectoring using postexit vanes around an axisymmetric nozzle. This thrust vectoring system will be tested on the NASA F/A-18 High Alpha Research Vehicle (HARV) aircraft. The system provides thrust vectoring capability in both pitch and yaw. Ground based data were gathered from two separate tests at NASA Langley Research Center. The first was a static test in the 16-foot Transonic Tunnel Cold-Jet Facility with a 14.25 percent scale model of the axisymmetric nozzle and the postexit vanes. The second test was conducted in the 30 by 60 foot wind tunnel with a 16 percent F/A-18 complete configuration model. Data from the two sets are being used to develop models of jet plume deflection and thrust loss as a function of vane deflection. In addition, an aerodynamic interaction model based on plume deflection angles will be developed. Results from the scale model nozzle test showed that increased vane deflection caused exhaust plume turning. Aerodynamic interaction effects consisted primarily of favorable interaction of moments and unfavorable interaction of forces caused by the vectored jet plume

    ATLAS detector and physics performance: Technical Design Report, 1

    Get PDF

    The ENABLE Machine - A Systolic Second Level Trigger Processor for Track Finding

    No full text
    The Enable Machine is a systolic processor for 2nd level triggering for the TRD. It is under development within the EAST/RD-11 collaboration at CERN. The task of the processor is to identify electron tracks and to reject pion tracks in less than 10 s. Track are identified by direct template matching in a region-of-interest (RoI) of the TRD. This is done by histogramming the coincidences of the mask templates and the RoI data for each track. Tracks of the same slope are handled in parallel, tracks of different slope in a pipeline. e/p discrimination is done according to the EAST benchmark algorithm. At an operational speed of 40 MHz the trigger decision time will be 6.5 s and the latency 7.0 s. The Enable Machine will be set up with programmable gate arrays so that it can be adapted easily to different applications. It is scalable in the RoI size as well as in the number of tracks processed concurrently. A prototype is scheduled for spring 1993. 1. Introduction Systolic proce..

    Multitasking on FPGA Coprocessors

    Full text link
    • …
    corecore