Efficiencies of Multiple - Input Techniques for Aircraft Ground Vibration Testing

The recent advances in multiple-input techniques for experimental modal analysis have given the test engineer alternatives for performing aircraft ground vibration tests (GVT). Multiple-input random excitation and polyreference analysis are two of the methods that are being used instead of the traditional sine dwell approach. The efficiency and advantages of these new methods are examined and examples of this application to recent aircraft GVT's are described.