Friction generated between an outer surface of {HEAD ~ the plate} and undersides of the adjacent shrouds reduces undesirable vibrations in {TAIL ~ the airfoils}  
Friction generated between an outer surface of { HEAD ~ the plate } and undersides of the adjacent shrouds reduces undesirable vibrations in { TAIL ~ the airfoils }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH