Pyrotechnic Shock Analysis Using Statistical Energy Analysis

Abstract

MIT Lincoln Laboratory (MIT/LL) has been developing a computational method to predict themaximum structural response due to a pyrotechnic shock input using Statistical Energy Analysis(SEA). It had been previously understood that since the pyrotechnic shock is not a steady stateevent, traditional SEA method may not applicable. A new analysis methodology effectivelyutilizes the traditional SEA modeling by employing an energy constraint using the ShockResponse Spectrum (SRS) as the steady state input condition. Responses are recovered in theSRS and can be used to develop pyrotechnic shock design and test requirements for varioussubsystems of the model. Response accelerations in the time domain corresponding to theresponse spectra are estimated using the Peak Ratio (PR). The response waveform is obtainedusing the inverse transform of the product of the input acceleration and the transfer function ofthe SEA model. The most probable input acceleration may be obtained using the stochastic SRSdecomposition method. Response waveforms can be further refined based on phase perturbationsusing the wave numbers of the SEA subsystems. A couple of validation examples are provided todemonstrate the new approach.

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Document Details

Document Type
Technical Report
Publication Date
Oct 23, 2015
Accession Number
AD1034555

Entities

People

  • James H Hwang

Organizations

  • MIT Lincoln Laboratory

Tags

Communities of Interest

  • Space

DTIC Thesaurus Topics

  • Air Force
  • Computational Science
  • Elements
  • Engineering
  • Equations
  • Frequency
  • Frequency Bands
  • Frequency Response
  • Mathematical Models
  • Shock Response Spectra
  • Shock Tests
  • Space Systems
  • Spectra
  • Steady State
  • Structural Response
  • Time Domain
  • Waves

Readers

  • Computational Fluid Dynamics (CFD)
  • Rocket Propulsion.
  • Wave Propagation and Nonlinear Chaotic Dynamics.