Use this calculation for a first-order acoustics estimate when the stated geometry, propagation model, averaging convention, reference quantity, and SI units match the measurement or design problem.

Mach Number

A finite measured or assumed value greater than or equal to 0.

The implemented rule is: Mach angle in degrees asin(1/M) for supersonic Mach number.^[1]

Angle Degrees

The calculated angle degrees, expressed in deg.

This is an idealized calculation rather than a complete acoustic simulation or measurement. Reflections, boundary conditions, directivity, damping, frequency dependence, near-field behavior, background noise, transducer response, temperature, humidity, and geometry can change a real result.

Confirm important results with calibrated measurements or a model that includes the actual geometry, materials, boundaries, source directivity, and frequency-dependent losses. Preserve the reference quantity and weighting whenever a result is expressed in decibels.

• Half Wave Resonator Length

  Ideal half-wave resonator length from sound speed and fundamental frequency, before end correction.

• Quarter Wave Resonator Length

  Ideal quarter-wave resonator length from sound speed and fundamental frequency, before end correction.

• Standing Wave Node Spacing

  Distance between adjacent nodes of a standing wave from its wavelength.