U : Sound and Vibration Definitions, Terms, Units, Measurements ...
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acoustic oscillation whose frequency is above the high-frequency limit of audible sound (about 16 kHz)
normal mode oscillating independently of other modes, see also coupled modes
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
Units : SI Units
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