Control of gaps in technical structures during ground vibration testing

OBRABOTKAMETALLOV Vol. 20 No. 3 2018 MATERIAL SCIENCE EQUIPMENT. INSTRUMENTS 3 2 21 Fig. 8 . Gaps in a control wiring of high-lift devices of an airplane. The global normalization of the distortions at the bending frequency of the wing. The distortions of the portraits of oscillations distributed along the airplane, which control system is unboosted, are shown in Figure 9. The maxima of the distortions were discovered on the elevator and elevator tab because of the gaps in the control wiring. After exclusion of these distortions from the distribution, the maximum value was found at the connection between the control stick and control wiring, where the increased gap was detected (Fig. 10). Fig. 9 . Gaps in a control wiring of an elevator and elevator tab: a – sensors located on the control stick; b – the distortions distributed along the elevator and elevator tab Fig. 10 . The backlash in the connection between the control stick and control wiring. The global normalization of the distortions of the portraits of oscillations