Mechanical Engineering Commons^™

The Effect Of Leaves And Steel Support Cables On The Dynamic Properties Of Northern Red Oak (Quercus Rubra) With Co-Dominant Trunks, Mark Reiland

Masters Theses 1911 - February 2014

Natural frequency and damping ratio were measured for ten forest grown northern red oak trees with co-dominant trunks. Steels support cables were installed in the canopies of five of the sample trees prior to measurement. Free vibration testing was performed during periods when leaves were and were not present. An accelerometer mounted at the base of the co-dominant union measured the acceleration time history during the free vibration testing. Natural frequency was determined from the acceleration time history using power spectral density analysis. Damping ratios were calculated from the power spectral density plots using the half power bandwidth method.

Trees …