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Wind Sound: Distance Models and Receptor Sum

Model free-field sound from a pressure or power reference, then combine compatible receptor levels and compare the result with an entered criterion.

Use this result well

Inputs that matter
Input level type, Documented A-weighted level (dB), Reference pressure-measurement distance (m), Power-source directivity factor Q, and 5 more
Output to expect
Sound pressure at a receptor, Combine receptor sound levels
  • Check the units and required inputs before comparing results.
  • Keep the assumptions with a copied result so you can reproduce the calculation later.
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Reference & details

How it works

Sound pressure at a receptor

Estimate ideal free-field receptor sound pressure from either a measured reference sound-pressure level or a sound-power level with an explicit directivity factor. These two level types are not interchangeable.

Pressure reference: Lp₂ = Lp₁−20log₁₀(r₂/r₁). Power reference: Lp = Lw+10log₁₀(Q/(4πr²)).

Combine receptor sound levels

Logarithmically combine independent source levels already expressed at the same receptor, weighting and time basis. Include background as its own row only if it is not already included in another measurement.

Total dB = 10log₁₀(Σ 10^(levelᵢ/10)).

Updated: September 2026

Example Scenarios

Try this example to see the calculation, then enter actual documented values and preserve the measurement conditions. A failed or unresolved comparison is part of the record.

→ 43.9794 dBA modeled sound pressure

Try this example to see the calculation, then enter actual documented values and preserve the measurement conditions. A failed or unresolved comparison is part of the record.

→ 43.647813 dBA combined receptor level

FAQ

Estimate ideal free-field receptor sound pressure from either a measured reference sound-pressure level or a sound-power level with an explicit directivity factor. These two level types are not interchangeable. Logarithmically combine independent source levels already expressed at the same receptor, weighting and time basis. Include background as its own row only if it is not already included in another measurement.

Use the exact equipment data, measurement point, operating conditions and units described in the selected mode. Record source documents, dates and unresolved conditions in Sources and assumptions. Built-in examples illustrate arithmetic; they are not manufacturer ratings or approved designs.

Use Save planning case for an explicit local history entry. Copy MD keeps current inputs and notes; Download CSV exports the result breakdown. Export portable copies before clearing storage and save a separate case after changing equipment, conditions or measurements.

About Wind Sound: Distance Models and Receptor Sum

Estimate ideal free-field receptor sound pressure from either a measured reference sound-pressure level or a sound-power level with an explicit directivity factor. These two level types are not interchangeable. Logarithmically combine independent source levels already expressed at the same receptor, weighting and time basis. Include background as its own row only if it is not already included in another measurement.