Boots – shoes – and leggings
Patent
1977-09-09
1980-04-01
Gruber, Felix D.
Boots, shoes, and leggings
60 3929, 340 27SS, 415 17, 415 39, F02C 914, F04D 2702
Patent
active
041964721
ABSTRACT:
A stall control system for axial flow compressors incorporating: a plurality of pressure transducers for developing signals indicative of the nonsteady pressure variations within the compressor and wherein these signals are separately filtered and rectified; analog comparators and gate comparators for each such signal to develop an output indicative of the difference between each of the signals and an adjusted pressure reference signal which is derived from the pressure rise across the compressor; a logic circuit for generating an actuating signal if any one of such signals is higher than the reference signal for controlling the opening of a gate which passes the combined pressure signals to an integrator which develops an output control signal to take corrective action in the presence of rotating stall within the compressor: an adjustable time delay circuit providing long and short decay times to prevent over-control.
REFERENCES:
patent: 3852958 (1974-12-01), Adams et al.
patent: 3867717 (1975-02-01), Moehring et al.
patent: 3868625 (1975-02-01), Speigner et al.
patent: 3872292 (1975-03-01), Dawson, Jr.
patent: 3935558 (1976-01-01), Miller et al.
patent: 3987620 (1976-10-01), Giordano et al.
Arendt Rudy H.
Ludwig Gary R.
Calspan Corporation
Gruber Felix D.
Jaffe Allen J.
Zobkiw David J.
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