CC/C-130J Human Vibration Investigation: Synchrophaser Effects
Interim rept. Dec 2004-Apr 2005
AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH HUMAN EFFECTIVENESS DIRECTORATE
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The purpose of this investigation was to evaluate the effects of several synchrophaser settings on human vibration transmission in the cabin of the CC-130J and C-130J aircraft. The investigation supported the Air Force Flight Test Center AFFTC and the Air Systems Command Global Reach Special Programs Office, C-130 Development System Office ASCGRB. The synchrophaser settings included OFF no synchrophaser, DEF default synchrophaser setting, OPT 1 option 1 synchrophaser setting and OPT 2 option 2 synchrophaser setting. Triaxial acceleration measurements were made on the troop seat pan and on the floor beneath the seat for the right, center, and left seat locations in the vicinity of the propeller plane, and at seat locations just forward of the troop doors CC-130J only. Six passengers participated in the study, providing vibration data for a statistical analysis of synchrophaser setting effects. The OPT 2 synchrophaser setting provided the most effective mitigation of the highest seat pan vibration associated with the blade passage frequency, but had little effect in reducing the substantial floor vibration. The effects on human comfort perception were inconclusive.