3种边界条件下足尺定向刨花板的模态灵敏度和振动模态研究  

Modal sensitivity and vibration mode of full-size oriented strand board panel under three boundary conditions

作　　者：管成[1,2] 辛振波 刘晋浩[1] 张厚江[1,2] 周建徽 李焕 柳苏洋 Guan Cheng;Xin Zhenbo;Liu Jinhao;Zhang Houjiang;Zhou Jianhui;Li Huan;Liu Suyang(School of Technology,Beijing Forestry University,Beijing 100083,China;Joint International Research Institute of Wood Nondestructive Testing and Evaluation,Beijing Forestry University,Beijing 100083,China;University of Northern British Columbia,Prince George V2L 16R,British Columbia,Canada)

机构地区：[1]北京林业大学工学院,北京100083 [2]北京林业大学木材无损检测国际联合研究所,北京100083 [3]University of Northern British Columbia,Prince George V2L 16R,British Columbia,Canada

出　　处：《北京林业大学学报》2021年第12期105-115,共11页Journal of Beijing Forestry University

基　　金：中央高校基本科研业务费专项(2021ZY71);中国博士后科学基金面上资助项目(2018M641225);林业公益性行业科研专项(201304512)。

摘　　要：【目的】研究完全自由、四节点支承和两对边简支3种边界条件下足尺定向刨花板的模态灵敏度和振动模态,为开展3种边界条件下足尺定向刨花板弹性常数振动检测结果的对比研究奠定基础。【方法】以4种厚度的足尺定向刨花板为研究对象,采用有限元软件COMSOL Multiphysics对完全自由、四节点支承和两对边简支的足尺定向刨花板进行了模态灵敏度分析,分别确定这3种边界条件下对其长度和宽度方向的弹性模量与面内剪切模量这3个弹性常数灵敏度最高的模态;通过试验模态分析测得足尺定向刨花板在这3种边界条件下的前9阶振动模态参数,并对比和分析其在这3种边界条件下的振动模态参数检测结果。【结果】计算和试验模态分析得到的这3种边界条件下足尺定向刨花板的前9阶模态振型形状和阶次分别是相同的;足尺定向刨花板在这3种边界条件下的前9阶模态中,除模态(m,0)、(0,2)和(1,1)外,其余模态均为单一方向的弯曲和扭转或不同方向弯曲的叠加模态;用于计算足尺定向刨花板长度和宽度方向的弹性模量与面内剪切模量的最高灵敏度模态,在完全自由下为模态(2,0)、(0,2)和(1,1),对应阶次分别为第2、4和1阶;在四节点支承下为模态(2,0)、(0,2)和(2,1),对应阶次分别为第1、4和3阶;在两对边简支下为模态(2,0)、(2,2)和(2,1),对应阶次分别为第1、5和2阶。【结论】从振型角度说明基于计算模态分析方法和试验模态分析方法分别进行3种边界条件下足尺定向刨花板的模态灵敏度分析和振动模态测试具有可行性。[Objective]To lay the foundation for the comparative study on vibration testing results of elastic constants for full-size oriented strand board(OSB)panel under these three boundary conditions,the modal sensitivity and vibration mode of full-size OSB panel under completely free boundary condition,supported on four nodes and simply supported on two opposite sides were studied,respectively.[Method]Full-size OSB panels with 4 kinds of thicknesses were used as study object.The modal sensitivity analysis of full-size OSB panels under these three boundary conditions was carried out using finite element software COMSOL Multiphysics,and the modes with the highest sensitivity corresponding to their three elastic constants including modulus of elasticity(E_(x) and E_(y))in the length and width direction as well as in-plane shear modulus G_(xy) were obtained;the first nine vibration modal parameters of full-size OSB panels under these three boundary conditions were measured through experimental modal analysis,and the testing results of their vibration modal parameters under three boundary conditions were compared and analyzed.[Result]The modal shape and order of the first nine mode of full-size OSB panel under three boundary conditions were separately identical through experimental and theoretical modal analysis;except for mode(m,0),(0,2)and(1,1),the first nine modes of full-size OSB panel under three boundary conditions were superimposed modes for bending and torsional in single direction or bending in different directions;the modes with the highest sensitivity for calculating E_(x),E_(y) and G_(xy) of full-size OSB panel were mode(2,0),(0,2)and(1,1)corresponding to the second,fourth and the first order under completely free boundary condition,mode(2,0),(0,2)and(2,1)corresponding to the first,fourth and the third order for being supported on four nodes,mode(2,0),(2,2)and(2,1)corresponding to the first,fifth and the second order for being simply supported on two opposite sides.[Conclusion]From the perspective of vibration m

关 键 词：边界条件 足尺定向刨花板 模态灵敏度 振动模态 

分 类 号：S781.23[农业科学—木材科学与技术]