V : Sound and Vibration Terms, Definitions, Units, Measurements ...
VDV • Vibration Dose Value
Vector spaces are applied throughout mathematics, science and engineering. They are the linear-algebraic notion to deal with systems of linear equations; offer a framework for Fourier expansion or provide an environment that can be used for solution techniques for partial differential equations.
Velocity of Sound
is usually taken to mean the speed of sound
. Not be confused with sound particle velocity
, which is the velocity of the individual particles of the medium
the sound wave is passing through. To add to the confusion the unit v is often included.
is the movement of particles in an elastic medium about an equilibrium
position. The movement may be periodic such as the motion of a pendulum or random.
Vibration is commonly expressed in terms of
frequency which are related.
Vibration Acceleration Level
Vibration at Work Regulations
, came into force in July 2005 to protect workers from risks to their health from vibration, based on
whole body vibration exposure action and limiting values
Vibration Dose Value
Vibration Exposure Action Value
Vibration Exposure Limit Value
Vibration Reference Levels
Vibration Regulations, see Vibration at Work Regulations
Vibration Weighting Networks
Vibration White Finger
Vibratory Acceleration Level
Vibratory Velocity Level
Viscous Damping Definition IEC 801-24-22,
damping that occurs when a particle in an oscillating
system is resisted by a force that has a magnitude proportional to the magnitude of the velocity of the particle and direction opposite to the direction of the particle
See also other damping topics.
, the derived SI unit
of electric potential; the potential difference between two points on a conductor carrying a current of 1 ampere
, when the power
dissipated between these points is 1 watt
Voltage Level (LV)
is the voltage expressed in decibels
, relative to 1 volt rms
, regardless of impedance.
LV = 20 lg (V/Vo) dBV
The reference voltage : Vo = 1 volt ≡ 0 dB
, a scalar quantity
is the amount of space that an object or substance occupies, the SI unit is the metre-cubed (m3
Volumetric Flow Rate (Q) is the volume of fluid which passes through a given surface per unit time.
Q = v·A, where v = velocity, A = area/surface and the SI units are m3/s.
Volumetric flow rate is also known as the volume flow rate, rate of fluid flow and volume velocity
Volumetric Flux (q) is the volumetric flow rate across a unit area. SI units : m3·s-1·m-2
Volumetric Power Density, volume based power density - watt/m3
Volume Velocity Definition IEC 801-21-31,
integral, over a vibration surface, of the product of the component of particle velocity normal
to the surface and the differential surface area
. Also known as sound volume velocity
, volumetric flow rate
and volume flow rate
See also • velocity.
VWF : Vibration White Finger
, see Hand Arm Vibration
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