Hello Shake community - we are new users who wanted to test the capability of the Raspberry Shake 3D to measure the natural frequencies of vibration of rock arches here in Utah. We’ve been making these measurements for several years now, but always using a Trillium Compact / Centaur setup from Nanometrics. While that setup is amazing, it’s expensive, so we thought to test a Shake in the application. University of Utah undergraduate student researcher Clayton Russel made it happen.
Short of it is, it works! With some small caveats but overall very successful, which is encouraging to support widespread low-cost resonance measurements and monitoring of geological as well as civil features. Rock arches generally have clear resonant modes but low vibration amplitudes, so capturing the ambient resonant frequencies is a challenging measurement for any system.
Below is a link to the report, including direct comparison plots between the Shake 3D and Trillium Compact, and at the end a link to download all raw data if you’re keen to test it for yourself - geohazards.earth.utah.edu/images/UROP_Final_Report_CR.pdf