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2 TRG-TRC007-EN
notes
period one
Fundamentals of Sound
What is Sound?
Sound is the audible emissions resulting from the vibration of molecules
within an elastic medium. It is generated by either a vibrating surface or the
movement of a fluid. In the context of building HVAC systems, this elastic
medium can be either air or the building structure. For structurally-borne sound
to become audible, however, it must first become airborne.
Noise is different than sound. Sound is always present, but is not always
obtrusive. Noise is defined as unwanted sound. Generally, people object to
sound when it interferes with speech, concentration, or sleep.
What is Sound?
I Audible emissions resulting from vibration of
molecules within an elastic medium
I Generated by vibrating surface or movement
of a fluid
I In buildings, it may be airborne or structure-
borne
I Noise is unwanted sound
Figure 3