Description
Compute mean active intensity from RMS pressure and supplied complex specific acoustic impedance.
Acoustic RMS pressure describes a fluctuating pressure amplitude. Active intensity depends on the resistive part of acoustic impedance, whereas pressure-based energy density also needs a propagation model, density, and sound speed. Reactive fields and progressive plane waves need different interpretations.
Compute mean active intensity from RMS pressure and supplied complex specific acoustic impedance.
When to use this tool
Use Acoustic Intensity Impedance Factor when you need the stated intensity or energy-density term under a specified acoustic impedance or plane-wave model.
How to use the tool and how it works
- Enter pressureRms, resistance, reactance. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read intensity. Use the output convention below.
For nonnegative pressureRms and resistance and nonzero resistance^2+reactance^2 return intensity=pressureRms^2*resistance/(resistance^2+reactance^2).1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| pressureRms | Nonnegative RMS acoustic pressure, not peak amplitude. | Required. Finite number; minimum 0. |
| resistance | Real part of specific acoustic impedance. | Required. Finite number; minimum 0. |
| reactance | Imaginary part of the same specific acoustic impedance. | Required. Finite number. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| intensity | Intensity | Required. Finite number. |
{
"input": {
"pressureRms": 2,
"resistance": 3,
"reactance": 4
},
"output": {
"intensity": 0.48
}
}Limitations and assumptions
- Pressure is RMS and impedance is specific acoustic impedance, with resistance and reactance in compatible units. Purely reactive impedance yields zero active intensity; the supplied values do not establish exposure safety or a complete acoustic field.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Signed zero is exported as zero.
Alternative or Complementary methods
Use an acoustic field model and appropriate measurements when plane-wave or scalar-impedance assumptions are insufficient. Distinguish RMS from peak pressure and active from reactive intensity.
References
Similar or alternative tools
- Acoustic Energy Density Pressure Term
Return mean potential and total acoustic energy densities for a progressive linear plane wave using RMS pressure.
- Radiation Pressure Absorption Reflection Factor
Use normal incidence in vacuum with forward transmission and explicitly supplied absorption/reflection fractions.