Measuring and testing – Miscellaneous
Patent
1982-05-18
1984-08-07
Goldberg, Gerald
Measuring and testing
Miscellaneous
434 31, G01N 3300
Patent
active
044636059
ABSTRACT:
To simulate, for testing purposes, the subsystems of an aircraft that electrohydraulically position the movable control surfaces of an aircraft, circuitry is provided for receiving input control signals, generated, for example, by an autopilot, and for transforming such signals into electrical output signals that are the analogs of signals produced by linear variable differential transformers (LVDT) feedback devices that track the actual movements and positions of the aircraft control surfaces. The relatively slow acting hydraulic components of the aircraft control subsystems are simulated by integrating circuitry and the resulting integrated signals are used to modulate an AC reference signal, which is then applied to the primaries of isolation transformers, the secondaries of which produce the simulated, analog LVDT feedback signals and also present a load impedance to the autopilot that closely matches the output windings of the simulated LVTDs.
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Kandelman, A. et al., "Simplified Model Eases Hydraulic System Simulation", pp. 65, 66, Apr. 1978.
McDowell Leon H.
Schmieder Daniel J.
Weber Roger E.
Goldberg Gerald
Roskos Joseph W.
The Boeing Company
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