Calculation of Transient Response from Time-Harmonic Spectrum

Abstract

Theory behind a Fortran program which facilitates computations of transient response is described. Discrete values of a time-harmonic spectrum are used, via quadratic interpolation and weighting by the transform of a selected time function, to provide samples for transient response calculations done by numerical evaluation of a Fourier integral using the fast Fourier transform (FFT) algorithm. Examples of motion, radiation and scattering transient responses of simple dynamical systems demonstrate that the program is a valuable research tool. This report is an update of previous work. Keywords: Great Britain; Motion; Radiation; Scattering; Dynamical system; Fast fourier transform.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1989
Accession Number
ADA211972

Entities

People

  • J. H. James

Organizations

  • Admiralty Research Laboratory

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Amplitude
  • Computations
  • Computer Programming
  • Computer Programs
  • Computers
  • Digital Signal Processing
  • Far Field
  • Fast Fourier Transforms
  • Frequency
  • Integrals
  • Numerical Integration
  • Resonance
  • Resonant Frequency
  • Scattering
  • Signal Processing
  • Sine Waves
  • Waves

Fields of Study

  • Engineering
  • Physics

Readers

  • Computational Modeling and Simulation
  • Control Systems Engineering.
  • Plasma Physics / Magnetohydrodynamics