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  1. donegalstevie

    SPL Noise Contour plots

    Thanks for the reply Greg. I think I found the solution. The SPL values can be combined using the following equation; Combined dB = 10log(10^(dB1/10) + 10^(dB2/10) + ....... + 10^(dBn/10))
  2. donegalstevie

    SPL Noise Contour plots

    Thanks for your replys. Thanks Greg for the links. I'm measuring the noise generated form a model helicopter on a CFD software. After reading their results again, I realised that they averaged the frequency over a number of revolutions of the rotor blades to eliminate any random portions of the...
  3. donegalstevie

    SPL Noise Contour plots

    Hi everyone, I'm have an array of microphones (13 x 17) measuring pressure over a certain time period. I want to create a sound pressure level contour (SPL) plot from the pressure time histories for frequencies in the range (416 - 2,780 Hz). If I apply a fourier transform of the pressure time...
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