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MIL-A-23282B(Wep)
in both clutches from zero condition, and the approach from
zero condition to balance current is made without overshoot,
i.e., without reversing the direction of the charge of the
current.
3.3.9 Smoothness of operation
3.3.9.1 Unloaded output.  The motion of the unloaded
actuator output shall be linear, on a time base, within
plus or minus 2 percent of total travel, excluding 10 per-
cent of the angular travel at the start from either end,
when the magnetic particle clutches are alternately ener-
gized with 7 plus or minus 2 ma.  (See Figure 1.) Test as
in 4.5.4.9.1.
3.3.9.2  Loaded output at rated current.  The output arm
shall not oscillate more than 2 degrees after the actuator
has reached its loaded position (in either direction), when
either magnetic particle clutch is energized by a constant
current of 12.5 plus or minus 0.5 ma, and the other magnetic
particle clutch has its current reduced to less than 1 ma,
and when the load applied to the output arm has a spring
rate of 28 plus or minus 1 pound-inch per degree.  This
requirement applies when the magnetic particle clutch coil
energization is switched to this condition from any other
immediately previous normal operating condition.  Test as
in 4.5.4.9.2.
3.3.9.3 Loaded output at balanced current.  The output
arm shall not oscillate more than 3 degrees when the con-
trol currents in each magnetic particle clutch are equalized
and remain equalized within 0.25 ma, and each magnetic
particle clutch has a control current of 5.75 plus or minus
0.75 ma, and when the load applied to the output arm has a
spring rate of 28 plus or minus 1 pound-inch per degree.
This requirement applies when the coil energization is
switched to the above condition from any other immediately
previous normal operation.
3.3.10 Duty cycle, defined.  For the purpose of testing
to simulate actuator service operation, a "duty cycle" is
defined as a minimum of 30 minutes of continuous operation
under the following conditions:
3.3.10.1 The input pulley shall be driven at 5000 to 6000
rpm in a clockwise direction when facing the pulley.
11

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