By the usage of PSVD analysis in the OTPA method, accurate vibrational and acoustical sources are identified. Under the high multiple coherence function precondition, the sources are partially coherent at several frequency points. A partial coherence analysis method is proposed and the power spectrum density contribution of independent part of sources and coupled part of sources are successfully calculated. With the increase of frequency, the contribution of the independent part of sound source and the coupled part of sound and vibration source decrease significantly. On the contrary, the contribution of independent part of vibration source increases.
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