Accession Number:

AD0784190

Title:

Experimental Verification of System Identification

Descriptive Note:

Final rept.

Corporate Author:

KAMAN AEROSPACE CORP BLOOMFIELD CT

Personal Author(s):

Report Date:

1974-08-01

Pagination or Media Count:

96.0

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 Biots Equation and Duncans 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.

Subject Categories:

  • Helicopters
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE