348 Ö. Mencek and M. Aykan Table 32.2 Comparison of modal test and FEM modal analysis results Test results (Hz) First set results (Hz) Error (%) First set results (Hz) Error (%) Third set results (Hz) Error (%) f1 287.65 262.21 8.84 262.75 8.66 263.92 8.25 f2 345.24 317.91 7.92 318.45 7.76 319.96 7.32 f3 474.69 484.22 2.01 485.07 2.19 487.32 2.66 f4 520.68 807.51 55.09 808.06 55.19 809.38 55.45 f5 959.74 1,154.3 20.27 1,154.6 20.30 1,155.1 20.36 f6 1,230.21 1,397.1 13.57 1,397.5 13.60 1,398.8 13.70 Fig. 32.10 First six natural frequencies and corresponding mode shapes of the gyroscope B from FEM f1 D262.75 Hz, f2 D318.45 Hz, f3 D485.07 Hz, f4 D808.06 Hz, f5 D1,154.6 Hz, f6 D1,397.5Hz Fig. 32.11 Location of accelerometers on gyroscope B for sweep tests
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