Accession Number : AD0739685

Title :   Analysis of the Rolling Motion of Finned Missiles at Large Angles of Attack.

Descriptive Note : Technical rept.,

Corporate Author : NAVAL WEAPONS LAB DAHLGREN VA

Personal Author(s) : Cohen,Charles J. ; Clare,Thomas A.

Report Date : FEB 1972

Pagination or Media Count : 21

Abstract : A method is presented for analyzing the single degree of freedom, nonlinear rolling motion of finned missiles. A nonlinear least squares fitting procedure is developed which is amenable to extracting the coefficients of linear and nonlinear roll moment terms from the rolling motion of missiles exhibiting roll lock-in, roll break-out, roll speed-up and combinations thereof. These phenomena and the second order differential equation describing them are sufficiently nonlinear to require a special application of the standard, nonlinear least squares procedures for fitting ordinary differential equations to observed data. The equations employed in this 'global' nonlinear least squares application and their relation to the roll phenomena in question are presented in this report. (Author)

Descriptors :   (*FIN STABILIZED AMMUNITION, ROLL), CONTROL, EQUATIONS OF MOTION, ANGLE OF ATTACK, MATHEMATICAL ANALYSIS, LEAST SQUARES METHOD

Subject Categories : Ammunition and Explosives

Distribution Statement : APPROVED FOR PUBLIC RELEASE