Acoustic Glossary


 

U : Sound and Vibration Definitions, Terms, Units, Measurements ...


UKAS : United Kingdom Accreditation Service is the national accreditation body recognised by government to assess, against internationally agreed standards, ...


Ultrasound Definition.

IEC 801-21-04, acoustic oscillation whose frequency is above the high-frequency limit of audible sound (about 16 kHz)

Uncoupled Mode Definition.

IEC 801-24-18, normal mode oscillating independently of other modes.

See also • Coupled Modes


C

Undamped Natural Frequency

the natural frequency of a structure.
 

Undamped Natural Frequency Definition.

IEC 801-24-09, frequency of free oscillation resulting from only elastic and inertial forces of the system.

See also • Natural Frequency


Under-range the input to the sound level meter is too low for the current measurement range. Change the range.


Under-range % percentage of time an under range occurred


UnitsSI Units

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