As multiple degree-of-freedom excitation systems continue to evolve and become standard hardware in many dynamic test facilities, there continues to be a lag in the development of associated spectral density based vibration specifications. The following discussion is centered on the development of a six-degree-of-freedom spectral density matrix based vibration specification and various comparisons to traditional single-degree-of-freedom, combined three-degree-of-freedom, and synthesized six-degree-of-freedom specification results, all computed from a common set of field data and assumptions of a common mission scenario. Laboratory test results and general observations are presented.

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