TRANSDUCER --(l) A device that converts
STALL --An inherent characteristic of all gas
a mechanical input signal into an electrical
turbine compressors to varying degrees and under
output signal. (2) Generally, a device that
certain operating conditions. It occurs whenever
converts energy from one form into another,
the relationship between air pressure, velocity, and
always retaining the characteristic amplitude
compressor rotational speed is altered so that the
variations of the energy converted.
effective angle of attack of the compressor blades
becomes excessive, causing the blades to stall.
TRANSFORMER --A device composed of
two or more coils, linked by magnetic lines
STATOR--The body of stationary blades or
of force, used to step up or step down an ac
nozzles of a turbine.
voltage.
SUMMARY ALARM--An indicator at a
TURBINE OVERTEMPERATURE PRO-
console that indicates to an operator that one of
TECTION SYSTEM (TOPS)--A system used on
several abnormal conditions has occurred on a
a CG- or DD-class ship to protect a surviving
certain piece of equipment.
generator from overload if another generator
fails.
SYNCHRO SELF-SHIFTING (SSS) CLUTCH--
The SSS clutch is a fully automatic, free-wheel
TURBINE INLET TEMPERATURE (TIT)--
device that transmits power through gear-toothed
The GTGS turbine inlet temperature on the
elements.
Allison 501-K17. (Known as T5.4 for an LM2500
GTE.)
TACHOMETER --An instrument used to
measure the speed of rotation of a device.
ULTRAVIOLET (UV) SENSOR--A device
that senses the presence of fire in the GTE and
TEMPERATURE --The quantitative measure
GTG enclosure and generates an electrical signal
of the relative hotness or coldness of an object.
that is sent to the ECSS.
THERMAL ENERGY--The potential and
UNINTERRUPTIBLE POWER SUPPLY
kinetic energy of particles of a body which can
(UPS) SYSTEM--Critical ship control systems
be evolved as heat.
have a UPS as an emergency power source.
The UPS is used to maintain operations
THERMOCOUPLE --(1) a bimetallic device
during any interruption of the normal power
capable of producing an emf roughly proportional
source.
to temperature differences on its hot and cold
junction ends. (2) A junction of two dissimilar
VACUUM--Pressure less than atmospheric
metals that produces a voltage when the junction
pressure.
is heated.
VARIABLE STATOR VANE (VSV)--A
THERMODYNAMICS--A branch of dynamics
compressor stator vane that is mechanically varied
that deals with the applied forces caused by the
to provide optimum, stall-free compressor per-
application of heat.
formance over a wide operating range.
THRUST BEARING--Bearing that limits the
VELOCITY --The rate of motion in a
axial (longitudinal) movement of the shaft.
particular direction. The velocity of fluid flow is
usually measured in feet per second.
THRUST--The forward directed reaction
force produced by a high-speed jet of air dis-
VENTURI--A device that depends for opera-
charged rearward from a nozzle or orifice.
tion upon the fact that as the velocity of flow of
air increases in the throat the pressure decreases.
TOLERANCE --The allowable
deviation
from a specification or standard.
VISCOSITY --The internal resistance of a
fluid which tends to prevent it from flowing.
TORQUE --A force or combination of forces
that produces or tends to produce a twisting or
VOLT--A unit of electrical potential.
rotary motion.
AI-8
