Improved Viscous Brake Design Using Simulation
PHILLIPS LAB HANSCOM AFB MA
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The SDIO High Altitude Balloon Experiment HABE required a rapid controlled descent of a large, heavy payload from a balloon platform. An existing viscous brake concept was chosen for the job, but the short time and space available coupled to the heavy payload resulted in very high power densities. Existing rules of thumb for viscous brakes were insufficient ,or the design. Viscous brake phenomenology and the particular physical constraints were coded into a modern continuous simulation applications package. After investigating both full dynamic and quasi-steady models, it was decided that the latter was adequate for all but the first and last small fraction of the descent. The model includes temperature dependent viscosity and a beat transfer model. The model been used extensively to investigate the design space and to develop test plans. Simulation, Viscous brake, Thermal mechanical model, Viscous brake design.
- Lighter-than-air Aircraft