Accession Number : AD0468054


Title :   DYNAMICS OF LIQUID-FILLED SHELL: RESONANCE AND EFFECT OF VISCOSITY


Corporate Author : ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD


Personal Author(s) : Karpov, Boris G


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/468054.pdf


Report Date : May 1965


Pagination or Media Count : 52


Abstract : Experiments have been conducted with liquid filled shell in free flight and with a liquid filled gyroscope. The cavities in each were designed to have a principal fluid frequency which was equal to the nutational frequency of the respective systems. Comparisons of experimental results with predictions of the inviscid theory of Stewartson showed significant Reynolds number effects. Both the rate of divergence of the nutational amplitude at resonance and the width of the resonance band are Reynolds number dependent. Also, there is a small shift or resonance frequency with Reynolds number. The experiments suggests, however, that in the limit, for large Reynolds numbers of the order of 10 to the 6th power, the inviscid theory gives excellent predictions.


Descriptors :   *PROJECTILES , *VISCOSITY , *GYROSCOPES , STABILITY , YAW , RESONANCE , FREE FLIGHT TRAJECTORIES , REYNOLDS NUMBER , PROJECTILE TRAJECTORIES , AERODYNAMIC CHARACTERISTICS , DAMPING , LIQUIDS


Subject Categories : Navigation and Guidance
      Ammunition and Explosives
      Fluid Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE