Analysis of high acceleration shock pulses part II: Pulse shaper material

Michael Sheehy, Gerard Kelly, Bryan Rodgers, Jeff Punch, Suresh Goyal

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

This is the second of two papers that deal with the investigation of a velocity amplification rig designed to create shock pulses capable of exciting micro-scale devices. A companion paper demonstrated the acceleration response spectrum induced on three ultimate masses of different geometries. It highlighted the accelerations achievable by means of velocity amplification and specifically analyses the pulse propagation through each mass. It also showed that the use of an isolated insert in the ultimate mass refined the shock pulse and improved the repeatability of the system. This paper looks at a discrete analysis of impact materials used to shape the duration and amplitude of the incident pulse. Hemispherical tipped impacters of steel, aluminium and nylon are used over a range of impact velocities to smooth the excitation pulses delivered by short duration high-g impacts on a steel rod. A comparative study of acceleration amplitudes and frequency distribution was carried out using signal analysis techniques. The experimental analysis yielded the acceleration ranges of the materials for a specific impact velocity. A 10,000g pulse was generated for each material for comparison of the time/frequency domains using wavelet analysis. This paper shows the feasibility of using different impact materials to obtain a specific shock duration for a set acceleration level.

Original languageEnglish
Title of host publicationProceedings of the SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2007
Pages1236-1243
Number of pages8
Publication statusPublished - 2007
EventSEM Annual Conference and Exposition on Experimental and Applied Mechanics 2007 - Springfield, MA, United States
Duration: 3 Jun 20076 Jun 2007

Publication series

NameProceedings of the SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2007
Volume2

Conference

ConferenceSEM Annual Conference and Exposition on Experimental and Applied Mechanics 2007
Country/TerritoryUnited States
CitySpringfield, MA
Period3/06/076/06/07

Keywords

  • High acceleration
  • Impact
  • Pulse shape
  • Shock
  • Wavelet transform

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