Accession Number : AD0784190

Title :   Experimental Verification of System Identification

Descriptive Note : Final rept.

Corporate Author : KAMAN AEROSPACE CORP BLOOMFIELD CT

Personal Author(s) : Flannelly, W G ; Giansante, N

PDF Url : AD0784190

Report Date : Aug 1974

Pagination or Media Count : 96

Abstract : Laboratory testing of helicopter system identification by single- point excitation showed correlation among the parameters identified by free-body shaking at two different points and theoretically derived parameters of the test specimen. Among the parameters investigated were the mass and stiffness matrices of five- and six-degree-of-freedom models and the structural damping coefficient of a continuous specimen. Experimentation demonstrated the identification of mathematical models having more degrees of freedom than modes in the measurements, a method of obtaining modal parameters by antiresonance theory, an engineering solution to the problem of imaginary antiresonance in Biot's Equation and Duncan's Equation for transfer impedances, a method of obtaining static influence coefficients by free-body testing without assumption of a mass matrix, and a method of determining static structural test loads of helicopter maneuvers.

Descriptors :   *DYNAMIC RESPONSE, *HELICOPTERS, *SYSTEMS ANALYSIS, COEFFICIENTS, CORRELATION TECHNIQUES, DAMPING, DEGREES OF FREEDOM, EXPERIMENTAL DATA, IDENTIFICATION, MASS, MATHEMATICAL MODELS, MATRICES(MATHEMATICS), MODEL TESTS, SHAKING, STIFFNESS, SYSTEMS ENGINEERING

Subject Categories : Helicopters
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE