Ping test (engineering)
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A ping test is a physical test to determine the natural frequency of an object or assembly.{{cite report| title=THE EFFECT OF A HARD COATING ON THE DAMPING AND FATIGUE LIFE OF TITANIUM | first=Frank T. | last=Ivancic | number=AFIT/GAE/ENY/03–12 | publisher=DEPARTMENT OF THE AIR FORCE, AIR UNIVERSITY, AIR FORCE INSTITUTE OF TECHNOLOGY, Wright-Patterson Air Force Base | location=Ohio, USA | url=https://apps.dtic.mil/sti/pdfs/ADA412854.pdf | archive-url=https://web.archive.org/web/20121009081512/http://www.dtic.mil/cgi-bin/GetTRDoc?Location=U2&doc=GetTRDoc.pdf&AD=ADA412854 | url-status=live | archive-date=October 9, 2012 | accessdate=19 June 2019 }} The test consists of instrumenting the object or assembly with measuring devices and then tapping it with another metallic object (usually a hammer.) The undamped system will then vibrate at its natural frequency. The ping test is used on assemblies and objects where vibration can be an issue.