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Page Title:
Power source utilization analysis chart |
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|  MIL-E-7016F
but such transients shall be reported and justified
in separate systems analyses when required by
the procuring acitvity.
The transient power requirements when superimposed
Note:
upon the 5-second average power requirements, shall
fall within the 5-second adjusted capacity of the power
source.
Power source utilization analysis chart. This analysis develops
3.5.4.4
the adjusted source capacities for each interval and for each operating condition and
compares these with the load requirements. See examples, Figures 7 and 12.
Aircraft flight conditions. The maximum true airspeed, max-
3.5.4.4.1
imum altitude and operating time are stated in the detail specification for the aircraft.
If entry of this information would raise the security classification of the report, it
may be omitted and reference made to the detail specification.
Power source operating conditions.
3.5.4.4.2
a.
The generator drive shaft speed in revolutions per minute
(rpm) is determined from the engine rpm, the gear pad ratio,
and/ or the drive characteristics.
For air-cooled generators, the minimum differential pres-
b.
sure across the generator is determined from the airspeed,
altitude, blast tube and generator characteristics.
The maximum air inlet temperature is determined from the
c.
airspeed, altitudes and blast tube characteristics, taking
into account the effect of temperature rise due to ram air
pressure.
d.
Appropriate data for oil-cooled generators, including oil
inlet temperature and flow rate.
Rating factor. A rating factor is a number which, when multi-
3.5.4.4.3
plied by the nominal rating (see 6.2.6.1) of a source, gives the capacity of the source
under specific operating conditions. Each rating factor for a specific operating
condition must be chosen so that the product of all the rating factors and the nominal
rating correctly defines the capacity of the source.
a. Mechanical rating factor. The mechanical rating factor is
established by the torque limitations of the generator drive
system. This rating factor is defined as the ratio of drive
13
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