Sound Pressure Level and Sound Power Level
In both places most of the key results are related to either Sound Pressure Level (SPL) or Sound Power Level (SWL).
■“Pressure" is a local indicator at a specific point in space. The equivalent for in multi-body dynamics could be thought of as a disp/vel/acc at a specific marker.
■“Power" is a global indicator of all noise radiated all around. It is an integrated value over space and based on p². The equivalent for structural analysis is something akin to mean square velocity <v²> over the structure
■Overall Sound Power Level (OSWL) is calculated by… OSWL = 10.log10(W/Wref)
■Overall Sound Pressure Level (OSPL) is calculated by… OSPL = 10.log10(pi²/pref²) where pi is the pressure at a microphone i
■Sound Pressure Level (SPL) over Time: The SPL over time is the integrated Sound Pressure Level (SPL) over the refreshing rate output over the entire simulation time. Thus, the entire simulation is cut into n elements each having one value of integrated SPL. Typical values for the refreshing rates of sound-meters are 1/8sec or 1sec, which could be used as refreshing rate. If compared to measurements the refreshing rate of the measurement instrument should be used.