A study of the T63-A-5 engine vibratory environment installed in the OH-58 and OH-6 light observation helicopters is presented in this report. The purpose of the study is to develop a common language for use in engine/airframe (translational) vibration specifications and analyses related to future helicopter programs. Mobility and modal synthesis techniques for coupled dynamic system analyses are developed. These techniques are then applied to the aforementioned helicopter systems for evaluation.
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