AN AUTOMATIC DATA SYSTEM FOR VIBRATION MODAL TUNING AND EVALUATION

摘要

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.