The phase difference between two engines for main office was 136°, for turbine factory was 57°, for No.1 engine was 21°and for No.2 engine was 4°. The optimum phase angle of 6th X-mode vibration was different from the reference position, that is, 273〜0°for main office, 112-137° for turbine factory and No.1 engine and for 137〜186°for No.2 engine.

That is to say, as structure vibration for main office was decreased, those of engine and turbine factory were increased conversely. Final phase angle was decided to 112｡?fter considering all situation.

　

Fig. 13 6th order vibration level(%) of No.1 engine during the phase adjustment

　

Fig. 14 6th order vibration level(%) of N0.2 engine during the phase adjustment

　

Fig. 15 6th order vibration level(%) of main office during the phase adjustment

　

Fig. 16 6th order vibration level(%) of turbine shop during the phase adjustment

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