Accession Number : AD0669997

Title :   BOUNDS TO BENDING FREQUENCIES OF NON-UNIFORM SHAFTS, AND APPLICATIONS TO MISSILES.

Descriptive Note : Technical memo.,

Corporate Author : JOHNS HOPKINS UNIV SILVER SPRING MD APPLIED PHYSICS LAB

Personal Author(s) : Rubinstein,Nathan ; Sigillito,Vincent G. ; Stadter,James T.

Report Date : FEB 1968

Pagination or Media Count : 76

Abstract : Non-uniform shafts can be used as models for the analysis of missile vibrations. Digital programs that can calculate the upper and lower bounds to frequencies of bending vibration of such free, non-uniform shafts and can accept input data in standard engineering units have been developed. How the programs are used (i.e., input/output data packages), underlying theory and its application to the programs, a description of the programs themselves, and the principal subroutines of the programs are presented. FORTRAN listings for both upper and lower bounds, along with sample printouts of both, are included. Improvements over other existing programs, offered by these programs are that they: (1) give upper and lower bounds that bracket the true frequencies, (2) are computationally fast and accurate, (3) can handle a large number of non-uniformities, and (4) can be easily extended to handle shafts that have more complicated variations of stiffness and mass than those presented. (Author)

Descriptors :   (*GUIDED MISSILES, VIBRATION), (*BENDING, FREQUENCY), MATHEMATICAL MODELS, COMPUTER PROGRAMS, DATA PROCESSING, INPUT OUTPUT DEVICES, AIRFRAMES, STIFFENED CYLINDERS, MASS ENERGY RELATION, DIGITAL COMPUTERS, BEAMS(STRUCTURAL), SHAFTS(MACHINE ELEMENTS), NONLINEAR SYSTEMS, MATRICES(MATHEMATICS)

Subject Categories : Computer Programming and Software
      Computer Hardware
      Guided Missiles
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE