Control of gaps in technical structures during ground vibration testing

OBRABOTKAMETALLOV Vol. 20 No. 3 2018 MATERIAL SCIENCE EQUIPMENT. INSTRUMENTS 3 2 21 Figure 13 illustrates how the distortions of the portraits of oscillations distribute on the spacecraft surface. It is the only one case within the frequency range of 20 to 100 Hz when the distortions of the portraits of oscillations were higher than calculation errors. The maximum distortions occurred near the attachment points of the solar batteries which contain the design gaps. Figures 14 and 15 illustrate the setup to perform theGVTof the different satellite and the distortion distributions of the portraits of oscillations of the antenna reflector. The points in Figure 15 represent the locations of the acceleration sensors on the surface of the reflector. The arrow depicts the damage location (gap): the destroyed adhesive connection between the support and frame. That location is characterized by the maximum distortions of the portraits of oscillations. Fig. 13 . Detecting gaps in attachment points of solar batteries Fig. 14 . A setup for testing an antenna reflector of a spacecraft structure 1 – a frame; 2 – a reflector; 3 – a shaker table Fig. 15 . The distortion distribution of the portraits of oscillations