The Potential Influence of Tree Crown Structure on the Ginkgo Harvest

Ginkgo biloba L. has significant health benefits and considerable economic value, but harvesting the fruit is highly labor-intensive. Mechanical vibration been shown effective in various types. In study of harvesting, research on characteristics trees focuses natural frequency (resonance frequency), model, damping coefficient, which are main factors affecting trees. But field experiments have that tree structure may an impact efficiency mechanical harvesting. addition, coefficient mainly low-frequency damping, relevant results cannot be applied to actual range. Applying a with low excite can reduce additional energy dissipation. This explored influence ginkgo crown law changes frequency. After counting 273 trees, two typical structures, monopodial branching sympodial branching, were selected analyzed for spectrum coefficient. The models different crown-shaped simulated analyze state at frequencies. For consistency frequencies branches was better than finite element model analysis shows partial vibrations when vibrating high high-frequency reflect overall canopy. coefficients types decreased increase 0.0148–0.0298, slightly smaller 0.0139–0.0248. Based test results, characteristics. indicate controlling by pruning help improve