3 Estimation of Rotational Frequency Response Functions 41 Fig. 3.2 Simulated test points on the cantilever beam (arrows in grey represent all the possible force locations) Results were produced for several combinations of number and locations of both measurement and excitation points, although the following set of test cases is considered (Fig. 3.2): Configuration 1 Case 1: measured DOFs: 7 13 19 27 I forced DOFs: 7 13 19 27 I )AD 7 13 19 27 ^ B DED¿ Configuration 2 Case 2: measured DOFs: 7 19 27 ; forced DOFs: 791315192127 I )AD 7 19 27 ^ B D¿ ^ ED 7 9 13 15 21 Case 3: measured DOFs: 11 19 27 ; forced DOFs: 791315192127 I )AD 19 27 ^ B DŒ11 ^ ED 7 9 13 15 21 For each case a set of results is presented and discussed in Sect. 3.4. Note that for all the test cases one presents the set of expanded FRFs used in the benchmark work [14], namely: H23,27 (FRF type: UA– unmeasured translation/applied force): H27,28 (FRF type: A – measured translation/applied moment): H28,28 (FRF type: – unmeasured rotation/applied moment at beam tip):
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