Wo-dimensional sound intensity probe and error analysis

Sound intensity is a vector, so obtained two-dimensional sound intensity is great significance for the noise source identification. Based on the two-microphone cross-spectral method for determining sound intensity, this paper introduces the structure of the new two-dimensional sound intensity probe, used for measuring two-dimensional sound intensity. It establishes the model of the sound intensity probe, and algorithms for two dimensional sound intensity components are given as well as error components. Then, the error characteristics of two-dimensional sound intensity probe are obtained through simulation experiments. On condition of the plane sound field and monopole sound field, this paper separately analyses the error characteristics of the probe. The results indicate that the measurement errors of total sound intensity are less than 1.5 dB, when frequency is below 3000 Hz, it is in the allowable range for engineering. Thus using two-dimensional sound intensity probe with three microphones can measure two-dimensional sound intensity fast and efficiently.