Accession Number : AD0656752

Title :   STATIC AND DYNAMIC INSTABILITIES OF A PROPELLANT LINE,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE AEROELASTIC AND STRUCTURES RESEARCH LAB

Personal Author(s) : Greenwald,Alan S. ; Dugundji,John

Report Date : MAY 1967

Pagination or Media Count : 64

Abstract : The static and dynamic instabilities of cantilever propellant lines with flowing fluid are investigated experimentally and theoretically. Experimentally, three different cantilever propellant lines were tested. Above a critical fluid velocity, flutter was observed in the form of traveling waves moving down the line. Static divergence was also observed at lower fluid velocities when the free end of the cantilever was pinned. Movies were taken exhibiting clearly the onset of flutter and divergence. Theoretically, two and four mode Galerkin solutions with different types of structural damping forces were obtained. Theory confirmed previous investigators' observations of sharp changes in flutter behavior at certain values of mass ratio and significant effects on stability caused by the type of structural damping present. Reasonably good agreement was found between the experimental flutter and divergence phenomena, and the theory. Using these and previous investigatiors' results, design curves are presented allowing quick estimates of the static and dynamic instability of such propellant lines. (Author)

Descriptors :   (*PIPES, STABILITY), (*FLUTTER, PIPES), DAMPING, VISCOELASTICITY, PROPELLANTS, FLUID DYNAMICS, CANTILEVER BEAMS, STATICS

Subject Categories : Fluid Mechanics
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE