Abstract

Equivalent field transformation (EFT) is a novel near-field testing technique. In response to the demand for measurement accuracy, numerical simulations were conducted to compare and analyze near-field acoustic holography and equivalent field transformation in a free field environment. The results showed that as the sound source frequency increased, the measurement accuracy of near-field acoustic holography decreased, while the equivalent field transformation always maintained a high measurement accuracy, Finally, an experimental environment will be established, and the theory of equal field transformation will be applied to near-field measurements of actual sound sources. The EFT results are basically consistent with the measured values, further verifying the correctness and effectiveness of this method.