The classical TPA method is essentially intended to identify transfer path contributions in existing products. A classical TPA performs operational tests on the assembled product AB to obtain interface forces \mathbf{g}_{\mathrm{2}}^{\mathrm{B}}
Both steps pose some challenges in practice. The FRFs of the passive side are typically determined from impact or shaker tests or in a reciprocal fashion using, for instance, an acoustic source at the receiving location and accelerometers at the interface nodes. Either way, it requires dismounting of the active part(s) from the passive side. Concerning the determination of \mathbf{g}_{\mathrm{2}}^{\mathrm{B}}
Hence, the following three variants of classical TPA can be defined according to how \mathbf{g}_{\mathrm{2}}^{\mathrm{B}}
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