MIL-S-85565(AS)
2.1.3 Order of precedence. In the event of a conflict between the
text of this specification and the references cited herein, the text of
this specification shall take precedence.
3.
REQUIREMENTS.
3.1 Item description. The servo is an electropneumatic mechanical
device that has self-contained energy in the form of compressed gas and a
thermal battery that will, on command, provide missile electrical power and
torque to two axes of missile-control surfaces proportional to the elec-
tronic control commands.
3.2 Characteristics.
3.2.1 Performance.
The servo shall meet the following performance
requirements.
3.2.1.1 Stall torque. The servo stall torque shall be greater than
1,520 inch-pounds (in-lb) in both directions for each axis while restrained
at 84 ±2 in-lb per-degree coaxial load (see Figure 1). The stall torque
in both directions for a given axis shall be within 100 in-lb.
3.2.1.2 Torque hysteresis. The torque hysteresis shall be within the
boundaries of Figure 1 while following a triangular electronic control
signal. Servo hysteresis shall be less than 200 in-lb between ±13.0 V
and less than 240 in-lb at all other control input voltages. The torque
hysteresis shall be greater than 50 in-lb between ±14.5 volts (see
Figure 1).
3.2.1.3 Torque symmetry. The symmetry of the torque hysteresis trace
shall be within 75 in-lb where the trace crosses ±500 in-lb and within 100
in-lb where the trace crosses 1,050 in-lb.
With no electronic control input, the servo
3.2.1.4 Torque unbalance.
shall have less than 75 in-lb
torque per axis between 0.220 and 0.720
seconds following application
of 1,105 ±15 pounds per square inch gage
(psig) pressure to the ground
test port.
3.2.1.5 Step response. The servo torque output shall be 63 percent of a
±560 ±40 in-lb steady state output within 120 to 180 milliseconds (ins) from
the input command signal. At low temperature (operating), the time shall be
within 120 to 210 ms.
3.2.1.6 Crosstalk. The servo crosstalk (cross axes torque drop) shall
be less than 40 in-lb when a full torque (not less than 1,520 in-lb) step
input is achieved at both axes with one axis lagging or leading by 0.5 ±0.1
second (see Figure 2).
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