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

An aerodynamic and laser point cloud technology, applied in image data processing, special data processing applications, instruments, etc., can solve problems such as high complexity, difficult to study the force of branches, and difficult to realize

Active Publication Date: 2019-03-08
NANJING FORESTRY UNIV
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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 ...

Method used

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

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Embodiment Construction

[0085] The following is based on Figure 1 to Figure 12 The specific embodiment of the present invention is further described:

[0086] This embodiment provides a method for analyzing the wind resistance performance of living trees based on laser point cloud and aerodynamics, and the specific method is described as follows.

[0087] (1) Skeleton extraction of different rubber tree species.

[0088] This embodiment will be based on ground lidar data, combined with machine vision and image graphics algorithms, and take two rubber trees as the research object, combined with cylinder fitting and Dijkstra's shortest path algorithm, to realize the accurate reconstruction of living trees and the degree of leaf attribution Calculate and analyze its attribution. The flow of the analysis method for the wind resistance performance of living trees based on laser point cloud and aerodynamics is as follows: figure 1 shown.

[0089] (1.1) Separation of branches and leaves:

[0090] Afte...

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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, ...

Claims

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Application Information

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IPC IPC(8): G06F17/50G06T17/00
CPCG06T17/00G06F2119/06G06F30/20Y02A90/10
Inventor 云挺黄笑黄智先曹林薛联凤
Owner NANJING FORESTRY UNIV
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