Reduced noise trim air system

Details Reduced noise trim air system Reduced noise trim air system

1990-12-10

1992-08-04

Tapolcai, William E.

Automatic temperature and humidity regulation

Mixing fluid of dissimilar temperature

Plenum type

137118, 454 74, 454262, G05D 2313

Patent

active

051351617

ABSTRACT:
Audio noise created by trim valves (66a-72a) in a warm air trim system (24) of an air cycle air conditioning system (10) is reduced by controlling the pressure drop across the trim valves as a function of the position of the valves (66a-72a). A proportional valve (112) typically under the control of an electronic controller (116) is controlled to set the pressure drop across the trim valves. Reducing the pressure drop across the trim valves, reduces the noise created by air flowing through the trim valves thereby reducing noise in an aircraft cabin.

REFERENCES:
patent: 2412071 (1946-12-01), Warner et al.
patent: 2923222 (1960-02-01), Manning et al.
patent: 2925255 (1960-02-01), Shaw
patent: 2931574 (1960-04-01), Zuiderhoek
patent: 3045983 (1962-07-01), Best
patent: 3089649 (1963-05-01), Curran
patent: 4445342 (1984-05-01), Warner
patent: 4773307 (1988-09-01), Goodman

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