Response of a tactical missle to aerodynamic excitation

摘要

A tactical missile instrumented with pressure and acceleration sensors was flown on a fighter aircraft to help characterize the "in carriage" flight environment. The pressure data has been analyzed witht wo techniques to determine if a simple, yet appropriate, model can be used to model forces applied to a structural finite elerment model. Analysis has revealed a nearly uniform "convection" of narrow-band random forces along the missile, indicating a highly coherent aerodynamic structure. The circumferential distribution of the standard deviation of measured pressures which tend to "swirl" along the missile seem to indicate the existence of shed vortex-related "swirl" of the aerodyanmic excitation. Lateral vibration of the missile has been analyzed using the finite element method, bothtwith and without an accounting for correlation (convection and swirl) within the aerodyanmic excitation. In some cases these effects may be extremely important.