A laser point cloud and aerodynamics-based standing tree wind resistance analysis method

Abstract

The invention discloses a laser point cloud and aerodynamics-based standing tree wind resistance analysis method. The method comprises the following steps of obtaining tree point cloud data and separating branches and leaves; contracting the branch point cloud by adopting a Laplace algorithm; segmenting the branch point cloud data into different layers from bottom to top; solving a clustering center point of each height layer, and fitting a limb of each height layer according to the clustering center point; classifying different limb skeletons of the standing tree into main limbs and secondarylimbs; completing the affiliation of the standing tree leaf point cloud data; establishing a forest stand model, loading wind power to the forest stand model; analyzing dynamic pressure in the foreststand according to the turbulence model and the fluid-solid coupling model. The method has the advantages that the calculation complexity is moderate, the spatial structure characteristics and the growth parameter changes of the standing trees can be better described, the qualitative and quantitative evaluation of the wind resistance of the standing trees under the typhoon is realized, the accuracy is high, and an accurate theoretical basis is provided for the cultivation and planting of the trees and the construction of wind prevention.

Description

technical field [0001] The invention relates to the technical field of wind resistance performance analysis of standing trees, in particular to a method for analyzing the wind resistance performance of standing trees based on laser point cloud and aerodynamics. Background technique [0002] China is one of the countries most affected by typhoons in the world. Strong typhoons will not only cause casualties, destroy buildings and bridges, but also cause trees to break and fall. In Hainan Province, every typhoon landing will cause a large number of rubber trees to fall, bend and dry, which may cause billions of dollars in economic losses. Therefore, it is of great significance to carry out research on the wind resistance of rubber trees. [0003] Today, the main methods for the study of wind resistance of trees are divided into: [0004] 1. From the stand point of view, such as: by considering the stand as a porous medium model, combined with the large eddy simulation method, ...

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Problems solved by technology

However, due to the number and variety of branches and leaves of the tree itself, it is difficult to finely reconstruct each leaf and its corresponding branches in a single tree.

Therefore, after the wind force is applied, it is impossible to accurately analyze the movement state of each branch and the deformation of each leaf after being subjected to the wind force. At the same time, it is difficult to study the force of the leaves on the branches by the wind force at different angles of attack, resulting in low efficiency and high complexity of this method, which is difficult to implement.

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