From: The Multimodal Dynamics of a Walnut Tree: Experiments and Models Date of download: 1/1/2018 Copyright © ASME. All rights reserved. From: The Multimodal Dynamics of a Walnut Tree: Experiments and Models J. Appl. Mech. 2012;79(4):044505-044505-5. doi:10.1115/1.4005553 Figure Legend: Normalized frequencies of modes of the walnut tree, as a function of the group of modes. (▪) Experimental data from Table . (—) Prediction using Eq. with λ and β derived from the actual tree geometry. The gray area corresponds to the 90% confidence interval on the geometrical parameters.