Position: Home > Articles > Frequency Domain Analysis of Independent Trees Windthrow Based on Von-Karman Spectrum
Journal of Northeast Forestry University
2013
(8)
165-169
基于Von-Karman谱的独立林木风倒机理的频率域分析
作 者：
贾杰;李洪峰;李静辉
单 位：
东北林业大学
关键词：
Von-Karman谱;风倒;空气动力导纳;弯矩谱;灵敏度
摘 要：
从频率域角度对独立林木的风倒机理等方面进行了研究。结果表明,前期研究所建立起来的动力学模型是合理的,并以此为基础,采用Von-Karman风谱模型计算出作用于林木的力谱,给出阵风频率的能量分配问题,从而获得基础弯矩谱,并给出基础弯矩极值的解析表达式,分析了影响参数变化灵敏度的原因。以悬铃树为例进行数值计算,得到了与测量值相吻合的有意义的结论,为后续研究和工程应用提供了理论基础。
译 名：
Frequency Domain Analysis of Independent Trees Windthrow Based on Von-Karman Spectrum
作 者：
Jia Jie,Li Hongfeng,Li Jinghui(Northeast Forestry University,Harbin 150040,P.R.China)
关键词：
Von-Karman spectrum;Windthrow;Aerodynamic admittance;Bending moment spectrum;Sensitivity
摘 要：
An experiment was conducted to study the mechanism of windthrow in view of the frequency domain.The established dynamic model is reasonable and the force spectrum can be obtained by the Von-Karman spectrum.The energy distribution was given to achieve a base moment spectrum and present the analytical expression of the extreme bending moment.The reasons of parameters sensitivity were analyzed.The significant conclusions from numerical calculation for planting tree are consistent with the measured value.Therefore,the research results can provide a theoretical basis for subsequent research and engineering application.
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