Protective drive-level limiter for an electro-hydraulic vibrator

Details Protective drive-level limiter for an electro-hydraulic vibrator Protective drive-level limiter for an electro-hydraulic vibrator

1983-08-05

1985-05-07

Moskowitz, Nelson

Communications, electrical: acoustic wave systems and devices

Signal transducers

Vibrator-type transmitter

181119, 181401, 73664, G01V 104, G01V 114, G01V 116

Patent

active

045162301

ABSTRACT:
In accordance with an embodiment of this invention, voltages are received from the pilot valve torque motor, the main servo valve and the actuator indicating the value of the torque motor current, spool position and actuator displacement. The received voltages are compared to a preselected threshold value. When one or more of the voltages exceed a threshold value, an attenuator control voltage is generated. An attenuator circuit is coupled between the reference driver signal generator and the DC servo amplifier. The attenuator control voltage, if present, is applied to the attenuator circuit and scales down the reference driver signal as a function of the error signal level thereby to limit the torque motor current and consequently the displacements of the main servo valve spool and actuator shaft.

REFERENCES:
patent: 3572089 (1971-03-01), Cligsman
patent: 4049077 (1977-09-01), Mifsud
patent: 4063613 (1977-12-01), Silverman
patent: 4297888 (1981-11-01), Hirai et al.
"MB Hydraulic Vibration Exciter and Force Generator System", 1960, 6 pgs., Bull. 1000 5M, 3-60.

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