5 Response DOF Selection for Mapping Experimental Normal Modes-2016 Update 41 (not purely nD0, 1 shapes). It is also noted that non-negligible summed RKE corresponds to unsatisfactory predicted modal orthogonality (off-diagonal terms greater than 10 %). 5.6.4 TAM Definition Using “Modified” Guyan Reduction The load patch distribution selected for the present sample consists of a set of six (6) or seven (7) unit load patterns per axial (Z) station, which are illustrated below in Fig. 5.4. Fig. 5.4 “Modified” Guyan reduction selected load patches Two separate reduction schemes and TAM mass matrices are evaluated herein, namely: (1) Six load patches per axial station (excluding the seventh “bulge, FR” patch) (2) Seven load patches per axial station. Application of “modified” Guyan reduction (scheme 1), employing the same instrumentation array used for “classical” Guyan reduction results in a TAM mass matrix, produces predicted test mode orthogonality (for the 22 “body” modes) and residual kinetic energy (summed for each mode) as summarized below in Table 5.4.
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