COPING WITH DISPERSION IN HOPKINSON-BARS

Felix Banda, Martin Brucke, Michael Mende

Abstract

Strain gauges can be used as cost-effective reference sensors in shock calibration systems based on Hopkinson-bar shock exciters. However, dispersion of the wave that’s propagating through the bar limits the attainable measurement uncertainty since the strain gauges and the device under test (DUT) must be mounted at different positions. This paper suggests a method how to reduce the influence of the dispersion effect on the calibration results and thus improve the measurement uncertainty significantly.

Keywords

Hopkinson-bar, shock calibration, dispersion compensation, ISO 16062-22

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IMEKO-WC-2015-TC22-433.pdf

DOI

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IMEKO TC

TC22 - Vibration Measurement

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