Abstract: In order to simulate broken branches caused by big wind quickly and realistically, a simulation algorithm was proposed. Firstly, a wind model was presented with reference to noise function. Then, mechanics of materials was applied to analyze the movement details of branches so as to get the deformation parameters of branches and the parameters were then introduced into the interpretation on the fractal geometry of trees. At last, on the basis of these models, a visual simulation method for broken branches was designed. This method could obtain visual simulation results of broken branches with different strong wind by modifying the wind model parameters. The simulation results show that the algorithm which provides new ideas for estimating disaster of trees is right and efficient.

Key words: noise function, mechanics of materials, broken branch, random, visualization

摘要： 为了快速真实地模拟风力过大引起的树木折枝现象，提出了一种仿真算法。首先结合噪声函数给出一个风场模型，然后应用材料力学知识分析树枝的运动细节后得出树枝的变形参数，并将变形参数加入到树木的分形几何解释中，最后在此基础上设计了树木折枝的可视化仿真方法。该算法可以通过调整风场模型中的参数得到不同风力作用下树木折枝的可视化仿真效果。仿真结果表明了算法的正确性和有效性，能够为统计树木受灾情况提供参考依据。

关键词: 噪声函数, 材料力学, 折枝, 随机, 可视化