Accession Number : AD0641030

Title :   INVESTIGATION OF GENERALIZED METHODS FOR USE OF EXCITATION PANELS TO PRODUCE HELICOPTER ROTOR BLADE FLIGHT FATIGUE LOADS DURING WHIRL TEST.

Descriptive Note : Final rept., 14 Jan 65-14 Apr 66,

Corporate Author : HUGHES TOOL CO CULVER CITY CALIF AIRCRAFT DIV

Personal Author(s) : Eakin,J. D. ; Amer,K. B.

Report Date : 16 AUG 1966

Pagination or Media Count : 50

Abstract : To supplement previous data obtained with three blades, rotors with two and four blades were whirl tested using the excitation panel technique. Rotor blades were tested having two different chord widths. A survey was made of the transient pressures produced on the excitation panels by the rotor blades. The resonant frequency of the third bending mode of the rotor blade was shifted from below the normal operating range to the maximum continuous power-on rpm by adding external weights to the blade leading edge. The use of a counterweight to replace a fatigue-damaged rotor blade during whirl testing was studied and rejected as being overly complicated. (Author)

Descriptors :   (*ROTOR BLADES(ROTARY WINGS), FATIGUE(MECHANICS)), FLIGHT TESTING, LOADS(FORCES), HELICOPTER ROTORS, PANELS, DAMAGE

Subject Categories : Helicopters

Distribution Statement : APPROVED FOR PUBLIC RELEASE