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林木采育机多密实度蜂窝辊的径向压缩响应

张高谦 王典 曲云飞 刘晋浩

张高谦, 王典, 曲云飞, 刘晋浩. 林木采育机多密实度蜂窝辊的径向压缩响应[J]. 北京林业大学学报, 2022, 44(7): 135-145. doi: 10.12171/j.1000-1522.20210496
引用本文: 张高谦, 王典, 曲云飞, 刘晋浩. 林木采育机多密实度蜂窝辊的径向压缩响应[J]. 北京林业大学学报, 2022, 44(7): 135-145. doi: 10.12171/j.1000-1522.20210496
Zhang Gaoqian, Wang Dian, Qu Yunfei, Liu Jinhao. Radial compression response of honeycomb rollers with multi dense degrees for forest harvester[J]. Journal of Beijing Forestry University, 2022, 44(7): 135-145. doi: 10.12171/j.1000-1522.20210496
Citation: Zhang Gaoqian, Wang Dian, Qu Yunfei, Liu Jinhao. Radial compression response of honeycomb rollers with multi dense degrees for forest harvester[J]. Journal of Beijing Forestry University, 2022, 44(7): 135-145. doi: 10.12171/j.1000-1522.20210496

林木采育机多密实度蜂窝辊的径向压缩响应

doi: 10.12171/j.1000-1522.20210496
基金项目: 中央高校基本科研业务费专项(BFUKF202114)
详细信息
    作者简介:

    张高谦。主要研究方向:复合结构智能化。Email:zgq1631997@163.com 地址:100083北京市海淀区清华东路35号北京林业大学工学院

    责任作者:

    王典,博士,副教授。主要研究方向:林业装备与信息化。Email:wangdian@bjfu.edu.cn 地址:同上

  • 中图分类号: S776.2

Radial compression response of honeycomb rollers with multi dense degrees for forest harvester

  • 摘要:   目的  针对为林木采育机而设计的蜂窝进料辊,研究其在采伐时夹紧和翻转工序的模拟工况下,密实度差异对压缩响应的影响。  方法  将15套蜂窝辊按照密实度划分为3种等级,经由理论模型和模拟仿真分析,对多密实度下的力学和吸能特性的变化做量化探究。选出其中3套制备试件,进行线弹性阶段内的径向压缩试验,利用数字图像相关技术对压缩过程中试件的变形进行监测,比较微观上塑性铰处的结点变形,同时对比仿真与试验的结果,进而总结双V附翼蜂窝进料辊的变形模式。  结果  仿真结果显示:平台阶段下随着密实度增长约10%,蜂窝辊的等效应力上升幅度处于2 MPa以内,但吸能量则提升了近乎6倍。试验结果表明:线弹性阶段下相同幅度的密实度提升,虽然导致质量增大约59.78%,但接触力却获得约3.4倍的提升。变形观测后提出准静态压缩下的V型变形模式,在离散系数低于6%的情况下获得了验证。  结论  蜂窝辊在密实度为0.25 ~ 0.40范围内的压缩响应表现为:以壁厚和层数为主要变量的密实度分别与等效应力和吸能量均具有显著非线性的正相关关系;在近似密实度下,增加壁厚,有助于获得更高的抗压强度,减少层数则促进了吸能特性的提升;双 V附翼蜂窝进料辊在周向的变形机制显露出不均匀的拉胀现象。

     

  • 图  1  蜂窝进料辊的示意图

    t为壁厚、l为胞元半宽、θ1为下胞角、θ2为上胞角、θR为附翼角、lf为附翼半宽、 L为层数、N为胞元个数、R为辊外径、R0为辊内径、T为辊宽、c为联结量。t is wall thickness, l is cell half-width, θ1 is angle at the lower part of cell, θ2 is angle at the upper part of cell, θR is wing angle, lf is wing half-width, L is number of layers, N is number of cells, R is outer radius of roller, R0 is inner radius of roller, T is roller width, and c is connection quantity.

    Figure  1.  Schematic diagram of honeycomb feeding roller

    图  2  不同密实度的蜂窝进料辊的仿真模拟

    Figure  2.  Simulation of the honeycomb feeding rollers with different dense degrees

    图  3  蜂窝辊的等效应力和吸能量拟合曲线

    σ1σ2σ3σ4分别代表层数为1、2、3、4的辊的等效应力; e1e2e3e4分别代表层数为1、2、3、4的辊的吸能量; Fσ1Fσ2分别代表层数为1、2的辊的等效应力拟合曲线; Fe1Fe2分别代表层数为1、2的辊的吸能量拟合曲线。σ1, σ2, σ3, σ4 represent the equivalent stress of rollers with 1, 2, 3 and 4 layers, respectively; e1, e2, e3, e4 represent the energy absorption of rolls with 1, 2, 3 and 4 layers, respectively; Fσ1, Fσ2 represent the equivalent stress fitting curves of rolls with 1 and 2 layers, respectively; Fe1, Fe2 represent the absorbed energy fitting curves of rolls with 1 and 2 layers, respectively.

    Figure  3.  Equivalent stress and absorbed energy fitting curves of honeycomb rollers

    图  4  压缩试验相关设备搭建和压缩图像

    Figure  4.  Construction of equipment related to compression experiment and compressed image

    图  5  蜂窝进料辊位移分布云图

    Figure  5.  Displacement distribution nephograms of double V-wing honeycombs (RDVH)

    图  6  双V附翼型蜂窝结构的关键结点

    ABCDEbce均为加载前的对应区域的结点,A′、B′、C′、D′、E′、b′、c′和e′均为加载后对应区域的结点。A, B, C, D, E, b, c and e are node codes of corresponding areas before loading, A′, B′, C′, D′, E′, b′, c′ and e′ are node codes of corresponding areas after loading.

    Figure  6.  Key nodes of RDVH

    图  7  结点变形量−加载位移曲线

    双V附翼型蜂窝辊上结点的命名规则为:结点代号−所属密实度等级,L,M和H分别对应低、中、高密实度辊,ABCDE分别为结点代号。Naming rule of the node on RDVH is: node code-grade of RDVH. L, M and H correspond to RDVHs with low, medium and high dense degrees, respectively. A, B, C, D and E are node codes, respectively.

    Figure  7.  Node deformation-loading displacement curves

    图  8  多密实度型蜂窝进料辊数值仿真与试验变形结果比较

    Figure  8.  Comparison between numerical simulation and experimental deformation results of RDVHs with multi dense degrees

    图  9  V型模式变形

    Ω为内层胞元所在的区域,Li为平行直线系。Ω is the region where the inner cells are located, and Li is a parallel linear system.

    Figure  9.  V mode deformation pattern

    图  10  结点径向变形的曲面图

    Figure  10.  Surface of radial deformation of nodes

    图  11  压缩试验接触力−位移曲线

    Figure  11.  Contact force-displacement curves of compression test

    表  1  不同密实度等级的蜂窝进料辊的参数

    Table  1.   Parameters of honeycomb rollers with different dense degrees

    等级
    Grade
    壁厚
    Wall thickness/mm
    外径
    Outer radius/mm
    内径
    Inner radius/mm
    填充面积
    Filled area/mm2
    待填充面积
    Area to be filled/mm2
    密实度
    Dense degree
    低 Low 2.5 151.85 60.00 16297.598 58126.289 0.280
    中 Medium 5.0 155.74 60.00 20504.573 61885.284 0.331
    高 High 10.0 163.51 60.00 26039.716 69678.232 0.374
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-11-26
  • 修回日期:  2022-05-26
  • 网络出版日期:  2022-06-11
  • 刊出日期:  2022-08-02

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