An Automatic Data System for Vibration Modal Tuning and Evaluation
National Aeronautics and Space Administration, 1975 - Vibration - 38 pages
A digitally based automatic modal tuning and analysis system developed to provide an operational capability beginning at 0.1 hertz is described. The elements of the system, which provides unique control features, maximum operator visibility, and rapid data reduction and documentation, are briefly described; and the operational flow is discussed to illustrate the full range of capabilities and the flexibility of application. The successful application of the system to a modal survey of the Skylab payload is described. Information about the Skylab test article, coincident-quadrature analysis of modal response data, orthogonality, and damping calculations is included in the appendixes. Recommendations for future application of the system are also made.
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ACCEL accelerometers Air spring air-spring unit alphanumeric CRT AMTAS analog Application software automatic modal tuning capability co-quad analysis co-quad components co-quad data co-quad plots coincident and quadrature configuration modal survey control console data acquisition data acquisition subsystem data reduction digital plotter display units E.EE+EE ACTUAL eigenvector Excitation control subsystem F.FF+FF PH filter force and acceleration forcing distribution function G=(+X.XXE+XX hertz Johnson Space Center keyboard keyboard entry line printer load cell LOC XXX magnetic tape mass coupling maximum modal dwell modal response data modal test module N/A N/A N/A narrow-band option consists orbital configuration modal orthogonality performed PHASE 0 EX phase relationships Process control QUAD quadrature components quadrature values reference force resonance frequency selected servo servomechanism SET LBS shaker shown in figure signal sinusoidal sweep Skylab software support package spacecraft stick plots strain gage structure SUPSS SUPTM suspension system transducers tune multiple tuning and analysis XXE+XX