Accession Number : AD0657138

Title :   EXPERIMENTAL STUDIES ON VIBRATION CHARACTERISTICS OF SOME IDEALIZED MISSILE FINS,

Corporate Author : TEXAS UNIV AUSTIN DEFENSE RESEARCH LAB

Personal Author(s) : Dalley,J. W.

Report Date : 11 SEP 1957

Pagination or Media Count : 39

Abstract : This report describes a method of exciting missile fins and of determining some of their lowest natural frequencies and corresponding mode shapes. Three model configurations were tested: a constant thickness square plate, a constant thickness trapezoidal plate, and a square planform, double-wedge plate. All the plates tested were free at all edges except the root which was restrained at the quarter chord by a shear pin, and at the midchord by a rotatable shaft with its axis in the spanwise direction. Numerical values for the lowest three frequencies and photographs of the node lines for the corresponding modes are presented for the two constant thickness plates. Some difficulties were encountered which invalidated the test results for the double-wedge plate. Some photographs of the edges of the two constant thickness plates taken while the plates were vibrating are also presented. These photographs were taken with the aid of a stroboscope, and show the edge of the test plate at its two extremes of travel, thus showing the mode shape of the plate edge. Both the natural frequency and mode shape of the plates were found to be quite sensitive to the amount of restraint provided by the shear pin at the root quarter chord. (Author)

Descriptors :   (*VIBRATION, GUIDED MISSILE COMPONENTS), OSCILLATION, METAL PLATES, LOADS(FORCES), PERFORMANCE(ENGINEERING), TEST FACILITIES

Subject Categories : Guided Missiles
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE