Читать книгу Engineering Acoustics - Malcolm J. Crocker - Страница 103
Example 3.8
ОглавлениеBy making measurements around a source (an engine exhaust pipe) it is found that it is largely omnidirectional at low frequency (in the range of 50–200 Hz). If the measured sound pressure level on a spherical surface 10 m from the source is 60 dB at 100 Hz, which is equivalent to a mean‐square sound pressure p2rms of (20 × 10−3)2 (Pa)2, what is the sound power in watts at 100 Hz frequency?
