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vibration mode
vibration mode Most physical objects, from wings to
quartz crystals, can vibrate at a fundamental mode having
lowest frequency, or (depending on dimensions,
mounting, impressed forces, coupling and other factors)
at any of numerous modes having different visual pattern
and higher frequency. Fundamental mode usually longitudinal
over length or thickness, flexural over width or
thickness, and shear over thickness or face.
vibrator 1 Mechanical source of high-power sinusoidal
vibration for test purposes; also called vibration generator.
2 Rapid-action switch for alternately reversing
polarity of transformer primary fed from d.c. to give raw
a.c. output; also called vibrator converter.
vibratory torque control Mechanical coupling for rotary
output, eg from piston engine, which at low rpm locks
drive into hydraulically stiff configuration but at higher
rpm unlocks and allows drive to be taken through slender
quill shaft.
vibrograph Seismic instrument giving record of
vibration displacement/time.
vibro polishing Immersion in a vat of small abrasive
particles vibrated at a selected frequency.
Vic, vic Formation of aircraft all in same horizontal
plane having shape of V flying point-first; minimum
number of aircraft 3.
vicious cycling Standard maintenance procedure for
Ni/Cd battery in which charge is violently drained and
replaced; also called deep cycling.
Vickers pyramid Hardness testing machine in which
precise force drives pyramid-point diamond into
specimen, hence * Number = measure of surface hardness.
Vicon Visual confirmation (of voice instruction or clearance,
especially to take off).
Victor airway Airway linking VORs, thus virtually all
airways in US and many other countries; identified by
prefix V (from 1952).
victory roll Flambuoyant barrel roll performed at low
level over a fighter pilot’s home airfield to indicate at least
one air-combat victory on that mission.
VID 1 Visual identification, or VID required.
2 Virtual (confusingly, also visual) image display.
Vidap, VIDAP Voluntary Industry Distributor
Accreditation Program [2003–, monitors electronics
industry] (US).
video Generalized adjective or noun for electronic transmission
of visual information.
video compression Returning of video from primary
radar so that each radial trace is briefly stored and then
written more quickly; this allows time for cursive writing
of synthetic data.
video detector Diode which demodulates video signal.
video display Electronic display which, whether or not it
presents alphanumerics, symbology and other information,
presents pictures.
video extractor System for analysing all signals,
selecting all that form part of useful image (eg in TV or
radar) and excluding all others; in SSR usually synonymous
with plot extractor.
video link Telecom system conveying pictorial information.
video map(ping) Superimposition on radar display of
fixed information or picture, usually derived from finegrain
photo plate scanned in synchronization with
rotation of radar aerial or from computer memory, eg in
VIP
GCA to show exact relationship of aircraft to surface
obstructions.
video signal Telecom signal conveying video information.
Videotex System of computerized self-service information
terminals giving complete information (usually
without charge) to all users, eg passengers at airports.
vidicon Most common form of video (TV) picture
(camera) tube, in which light pattern is stored on photoconductive
surface; this is then scanned by electron beam,
which deposits electrons to neutralize charge and thus
generate output signal.
Vidissector Modern form of pioneer Farnsworth
camera tube; used in space TV surveillance (ITT).
VIDS Visual integrated [or information] display set [or
system].
VIE Video image exploitation.
Les Vieilles Racines French association of aerospace
pioneers and professionals.
Les Vieilles Tiges French association of pioneer pilots.
Vierendeel Girder (truss) comprising upper/lower
chords and verticals, without diagonals or shear web,
designed for flexure.
view Opinion; thus ‘to take a dim *’ = to oppose or
regret a decision or situation (RAF WW2).
VIEWS, Views 1 Vibration indicator early-warning
system.
2 Virtual integrated EW simulator.
VIF Vertical integration facility (space launch vehicle).
viff, VIFF Vectoring in forward flight; pilot control of
trajectory by direct control of propulsive thrust axis of
jet-lift V/STOL aeroplane, selecting downwards for lift
(normal acceleration) and forward of vertical for deceleration,
thus performing combat manoeuvres
unmatchable by any conventional aircraft. Hence verb to
viff, viffing etc.
Vigil Vinten integrated IR linescan.
Vigo pad Small concrete pan preferably surrounded by
concealing trees (STOVL).
VIGV Variable-incidence (or inlet or integral) guide
vane[s].
VII Viscosity index improver.
VIIRS Visible/IR imaging radiometer suite.
VIM 1 Vacuum-induction melting.
2 Vendor information manual.
V IMD Speed (IAS) for minimum drag.
V IMP Speed (IAS) for minimum power, not necessarily
same as above.
V i-mp Speed corresponding with lowest power at which
both height and speed can be maintained, ie minimum
speed for continuous cruise (not current use).
Vims Visible and infra-red mapping spectrometer.
V∞ V-infinity, ie free-stream velocity.
V (Int) 2 Vehicle integrated intelligence.
vinyl ester Low-viscosity solventless liquid resin used as
alternative to epoxy in wet lay-up of FRC materials.
VIO Violent, meaning heavy static or other radio interference,
normal code VLNT for other meanings.
violet Route(s) into and out from target area on colour
radar.
VIP 1 Value improvement programme.
2 Common meaning, very important person.
3 Video integrated processor, or presentation (see next
entry).
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