双V附翼型负泊松比蜂窝结构参数与原木接触面积耦合关系  

Coupling relationship between structure parameters of double-V-wings honeycomb with negative Poisson’s ratio and log contact area

作　　者：朱旭晨 王典[1] 刘晋浩[1] 黄青青[1] ZHU Xuchen;WANG Dian;LIU Jinhao;HUANG Qingqing(College of Engineering/National Forestry and Grassland Administration Key Laboratory of Forestry Equipment and Automation,Beijing Forestry University,Beijing 100083,China)

机构地区：[1]北京林业大学工学院/国家林业和草原局林业装备与自动化重点实验室,北京100083

出　　处：《华中农业大学学报》2021年第2期253-260,共8页Journal of Huazhong Agricultural University

基　　金：国家重点研发计划项目(2016YFE0203400)。

摘　　要：为解决林木采伐中进料辊造成树木损伤的问题,以进料辊中的双V附翼型蜂窝结构为研究对象,探究其胞元结构参数对伐倒木圆条树木的损伤机制。基于理论力学构建了双V附翼型结构单位胞元参数与屈服强度的理论模型,进而进行了Y方向压缩实验验证,考察在低速压缩条件下各胞元结构参数对该结构等效应力和能量吸收变化的影响,以及有限元仿真进料辊胞元结构参数与原木接触面积的耦合关系。选定聚氨酯作为辊型驱动应用材料,通过正交试验法,在较优参数θ_(1)、θ_(2)、t区间内使进料辊与木材接触面积增大14.56%~26.11%。研究结果表明,可根据具体工况需求选用确定胞元结构参数,且结构参数厚度t是影响负泊松比蜂窝结构密实应变的重要指标;通过双V附翼型负泊松比结构材料的选用和尺寸参数的改变,改善了进料辊作业时与木材的接触面积大小,降低原木所受压强。The double-V-wings honeycomb(DVWH)structure was used to explore the damage mechanism undermining parameters of its cell structure on the logging woods to solve the problem of damage of timber caused by the logging woods during forest harvesting.Based on theoretical mechanics,a theoretical model of the unit cell parameters and yield strength of the DVWH structure was constructed,and the Y-direction compression experiment was carried out to verify it.The effects of cell structure parameters on the equivalent stress and energy absorption changes of the structure under low-speed compression,and the coupling relationship between the finite element simulation of the feed roller cell structure parameters and the log contact area are investigated.Selecting polyurethane as the material for roller drive applications,the orthogonal test method was used to select the optimal parameters in theθ_(1),θ_(2),t interval to increase the contact area between the feeding roller and the log by 14.56%-26.11%.Results showed that the cell structure parameters can be selected and determined according to the requirements of specific working conditions.The structural parameter thickness t was an important index affecting the compaction strain of the DVWH structure with negative Poisson’s ratio.Changing the materials selected for the negative Poisson’s ratio structure and the size parameters of the DVWH negative Poisson’s ratio structure can improve the contact area between the feeding roller and the wood and reduce the pressure on the log.

关 键 词：进料辊 双V附翼型结构 负泊松比 林木联合采育机 森林工程 原木损伤 伐倒木 

分 类 号：S776.31[农业科学—森林工程] S776.33[农业科学—林学]