TY - GEN
T1 - Modal testing
T2 - 42nd Engineering Geology and Geotechnical Engineering Symposium and 14th Intermountain Conference on the Environment: Geotechnics, Environment, Energy, and Economics (GE) - The Links for Sustainability
AU - Sarno, Ariel
AU - Hudyma, Nick
AU - Hiltunen, Dennis
AU - Maclaughlin, Mary
PY - 2009
Y1 - 2009
N2 - Laboratory based dynamic characterization of rock specimens typically consists of analyzing time data to calculate compression (P) wave and sometimes shear (S) wave velocities. These wave velocities have been correlated to numerous physical and engineering properties of rock. There are important modal properties and additional dynamic properties of rock specimens that can be attained by capturing full waveforms and applying modal analysis techniques. Since the 1960's, modal testing has been routinely employed to investigate the dynamic behavior of machines, structures, and components. However the application of modal testing to rock characterization is an area that is virtually unexplored. Modal testing, specifically impact hammer testing, can be used to determine a number of dynamic properties such as mode shapes, damping, natural frequencies, as well as P-wave and constrained velocities, dynamic modulus, and dynamic Poisson's ratio. The equipment required for such testing is relatively simple: accelerometer, instrumented hammer, and a dynamic signal analyzer. Three different case studies involving the use of modal testing are presented. The case studies consist of developing relationships between macroporosity and wave velocity for plaster of Paris specimens, developing relationships between wave velocity and damping with weathering for limestone specimens, and the comparison of dynamic properties from pre- and post- destructive testing. In all case studies interesting relationships were developed. Modal testing using an impact hammer testing was found to be a fast and convenient method to characterize rock core specimens. Modal properties proved to be an excellent supplement to common dynamic properties used for rock characterization.
AB - Laboratory based dynamic characterization of rock specimens typically consists of analyzing time data to calculate compression (P) wave and sometimes shear (S) wave velocities. These wave velocities have been correlated to numerous physical and engineering properties of rock. There are important modal properties and additional dynamic properties of rock specimens that can be attained by capturing full waveforms and applying modal analysis techniques. Since the 1960's, modal testing has been routinely employed to investigate the dynamic behavior of machines, structures, and components. However the application of modal testing to rock characterization is an area that is virtually unexplored. Modal testing, specifically impact hammer testing, can be used to determine a number of dynamic properties such as mode shapes, damping, natural frequencies, as well as P-wave and constrained velocities, dynamic modulus, and dynamic Poisson's ratio. The equipment required for such testing is relatively simple: accelerometer, instrumented hammer, and a dynamic signal analyzer. Three different case studies involving the use of modal testing are presented. The case studies consist of developing relationships between macroporosity and wave velocity for plaster of Paris specimens, developing relationships between wave velocity and damping with weathering for limestone specimens, and the comparison of dynamic properties from pre- and post- destructive testing. In all case studies interesting relationships were developed. Modal testing using an impact hammer testing was found to be a fast and convenient method to characterize rock core specimens. Modal properties proved to be an excellent supplement to common dynamic properties used for rock characterization.
UR - http://www.scopus.com/inward/record.url?scp=84869038112&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:84869038112
SN - 9781622762507
T3 - 42nd Engineering Geology and Geotechnical Engineering Symposium and 14th Intermountain Conf. on the Environment: Geotechnics, Environment, Energy, and Economics (GE) - The Links for Sustainability
SP - 147
EP - 160
BT - 42nd Engineering Geology and Geotechnical Engineering Symposium and 14th Intermountain Conf. on the Environment
Y2 - 5 November 2009 through 6 November 2009
ER -