### Strutt Help

Moving Point Source SEL Pass-By
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**Strutt|Propagation|SEL from Moving Point Source** inserts the Sound Exposure Level (SEL) from a moving point source into the active row of the worksheet.

The SEL from a moving point source is calculated by:

`SEL = L_max+10log_10(K_r/V)`, where `0 <= K_r <= pi`

For a completely directional source, `K_r=0`; for an omnidirectional source, `K_r=pi`

A value of `K_r = 1.83` is suggested for aircraft noise. For diesel locomotives, the directivity characteristics of the source lead to a maximum value of 2.0 for `K_r`.

`V` is the velocity of moving point source.

References:

- Transportation Noise Reference Book p2/8

Comments or suggestions to
strutt@arup.com