As the skill of sound source detection, acoustic intensity method and acoustic holography method are researched and used for automobile engines. Almost all research of these methods is on the basis of perfect silent environment. But in the actual use, dead room is rarely used. So the measurement is inevitably performed in resonance environment. In this research, the resonance interference is numerically simulated in the monopole sound source detection. And the robustness against the resonance is compared between acoustic intensity method and acoustic holography method.
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