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Natural sway frequencies and damping ratios of trees: influence of crown structure (2004)
Journal Article
Moore, J. R., & Maguire, D. A. (2005). Natural sway frequencies and damping ratios of trees: influence of crown structure. Trees - Structure and Function, 19(4), 363-373. https://doi.org/10.1007/s00468-004-0387-y

Natural frequency and damping ratio were measured for nine plantation-grown Douglas-fir (Pseudotsuga menziesii Mirb. Franco) trees from the Oregon Coast Range under different levels of crown removal. Natural frequency of trees, in both their unpruned... Read More about Natural sway frequencies and damping ratios of trees: influence of crown structure.

Natural sway frequencies and damping ratios of trees: concepts, review and synthesis of previous studies (2004)
Journal Article
Moore, J. R., & Maguire, D. A. (2004). Natural sway frequencies and damping ratios of trees: concepts, review and synthesis of previous studies. Trees - Structure and Function, 18(2), 195-203. https://doi.org/10.1007/s00468-003-0295-6

Previous studies that measured the natural frequencies and damping ratios of conifer trees were reviewed and results synthesized. Analysis of natural frequency measurements from 602 trees, belonging to eight different species, showed that natural fre... Read More about Natural sway frequencies and damping ratios of trees: concepts, review and synthesis of previous studies.