Air-borne and structure-borne noise
Airborne noise is transmitted through loud voices, machinery, television, radio, barking dogs, jets flying overhead, trucks, trains or any other noisy machinery passing by.
Structure-borne noise is noise that occurs from the impact of an object hitting a surface, like heavy dragging accross the floor. The impact causes both sides of the inflicted surface to vibrate and generate sound waves. For example, if your upstairs neighbor drops a plate or a kitchen pot onto the floor, the collision will vibrate from the floor up into their space as well as down the other side, through the ceiling of your space.
The key to reducing structure-borne noise is weakening the vibrations created from the noise source. While it is impossible to eliminate all structure-borne noise, there are a number of ways to greatly reduce it. There are a wide range of noises and vibration sources which should be considered significant and included in the structural design review and isolation design provision.
Structure-borne noise is generally transmitted through solid structures, such as steel, wood, concrete, stone etc. This includes for example impact sound and part of the noise generated by the technical machinery installed in a building. The unit of measurement for describing sound is the decibel ("dB").
Flanking transmission - a more complex type of noise transmission, is where the resulting vibrations from a noise sources are transmitted to other rooms of the building usually by elements of structure within the building. For example, in a steel framed building, once the frame itself is set into motion the effective transmission can be pronounced.
Structure-borne noise and vibration control
Structure Borne Noise and Vibration Control is the integration of a specific design to reduce and minimise structure borne noise energy from propagating and entering the acoustically sensitive spaces.The aim of the vibration isolation design is to achieve the recommended or required ambient vibration criteria within the building structure to a specific Vibration Criteria level. Vibration Isolation design would consider the occurring natural structural members' natural frequencies, by analysing the building design dynamics and dimensions, column and beam structural design to establish the most efficient engineering solution.
A simple diagram showing stucture borne noise and vibration control
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