Data processing: measuring – calibrating – or testing – Measurement system – Measured signal processing
Patent
1996-10-16
1998-12-01
Barlow, John
Data processing: measuring, calibrating, or testing
Measurement system
Measured signal processing
702 56, 248550, 248636, 248638, 267136, 26714011, F16F 710
Patent
active
058452362
ABSTRACT:
A hybrid active-passive system (20) for reducing noise within a passenger compartment and vibration of a fuselage of a vehicle, such as an aircraft (turboprop, turbofan, or helicopter). The hybrid active-passive system (20) includes, in combination: an active acoustic producer such as a loudspeaker (35), Active Vibration Absorber (AVA) (34), or active absorber assembly (39) for producing antinoise within the compartment (42), and a passive resonant device, such as a passive Tuned Vibration Absorber (TVA) (36), or passive TVA assembly (37) for controlling vibration of the fuselage or structural supports interconnecting the disturbance source (e.g. power plants (26), propellers (28a), gearbox (57), main rotor (28m), tail rotor (28t)) and the fuselage wall (25).
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Jolly Mark R.
Miller Lane R.
Norris Mark A.
Rossetti Dino J.
Barlow John
Lord Corporation
Vo Hien
Wayland Randall S.
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