Accession Number : AD0729317

Title :   A Full-Scale Experimental Feasibility Study of Helicopter Rotor Isolation Using the Dynamic Antiresonant Vibration Isolator.

Descriptive Note : Final rept.,

Corporate Author : KAMAN AEROSPACE CORP BLOOMFIELD CONN

Personal Author(s) : Jones,Robert

Report Date : JUN 1971

Pagination or Media Count : 143

Abstract : The report contains the results of a full-scale experimental feasibility study of rotor isolation employing the Dynamic Antiresonant Vibration Isolator (DAVI). The full-scale experiments were performed on a UH-2 helicopter fuselage isolated from a simulated rotor and transmission. Tests were conducted for three directions of vibratory input at the hub on the nonisolated vehicle and then compared to results obtained for the isolated vehicles. Tests on the isolated helicopter were conducted for two-bladed, three-bladed, and four-bladed rotor configurations. These rotor configurations were simulated by proper tuning of the DAVI isolation system to the predominant excitation frequency of the rotor systems. Results of this experimental study on a 6500-pound helicopter show that rotor isolation is feasible. Excellent reduction of vibration throughout the fuselage was obtained at the predominant excitation frequency (n-per-rev). This was accomplished with low static deflection, minimum weight penalty, and small relative vibratory deflections between the rotor and fuselage. (Author)

Descriptors :   (*HELICOPTER ROTORS, VIBRATION ISOLATORS), (*HELICOPTERS, VIBRATION), FEASIBILITY STUDIES, FUSELAGES, DAMPING, RESONANT FREQUENCY, TEST METHODS, STATISTICAL DATA

Subject Categories : Helicopters
      Machinery and Tools

Distribution Statement : APPROVED FOR PUBLIC RELEASE