Electricity: motive power systems – Positional servo systems – With particular 'error-detecting' means
Patent
1974-07-15
1976-06-29
Schaefer, Robert K.
Electricity: motive power systems
Positional servo systems
With particular 'error-detecting' means
318652, 73505, G01P 1500, B64C 1702
Patent
active
039671780
ABSTRACT:
An angular displacement transducer having a mounting base for mounting an inertial element sensitive to low frequency angular displacements and an inertial element sensitive to high frequency angular displacements. The low frequency sensitive inertial mass is a solid rotor device having a pickoff for sensing angular displacement between the solid inertial mass and the mounting base. A feedback centering circuit responsive to the pickoff output maintains the solid inertial mass in a substantially neutral position relative to the mounting base for displacement frequencies below the band of interest and allows the solid mass to move in an open loop fashion within its band of interest. The inertial mass sensitive to high frequency angular displacements is a fluid mass having a pickoff for sensing displacement of the mounting base relative to the fluid mass. A feedback centering circuit responsive to the fluid mass displacement sensor output is disposed to impart the motion of the mounting base to the fluid mass for displacement frequencies below the band of interest and allows the fluid mass to operate open loop within its band of interest. The solid inertial mass pickoff output is directed to a low pass filter and the fluid inertial mass pickoff output is directed to a high pass filter. The response time of the feedback centering circuit for the solid inertial mass is long enough in the band of interest to produce pickoff output related to angular displacement in the low frequency range and the response time of the feedback centering circuit for the fluid inertial mass, while shorter, is long enough in the band of interest to produce pickoff output related to angular displacement in the high frequency range. The outputs from the high and low pass filters are summed and presented as angular displacement sensor output over the wide band of high and low frequencies. Adjustment of feedback centering circuit gain and viscosity of fluid inertial mass viscosity may provide a wide band angular velocity sensor.
REFERENCES:
patent: 2853287 (1958-09-01), Draper et al.
patent: 3052127 (1962-09-01), Mott
patent: 3479886 (1969-11-01), Canfield
patent: 3507158 (1970-04-01), Wilcox
patent: 3520196 (1970-07-01), Morris et al.
Feldhaus John J.
Schaefer Robert K.
Systron Donner Corporation
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