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支撑形式对振动式锯材弹性模量测定影响的研究

张厚江,  王朝志,  苏娟

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文章导航 > 北京林业大学学报  > 2009 >  31(3): 120-123
张厚江, 王朝志, 苏娟. 支撑形式对振动式锯材弹性模量测定影响的研究[J]. 北京林业大学学报, 2009, 31(3): 120-123.
引用本文: 张厚江, 王朝志, 苏娟. 支撑形式对振动式锯材弹性模量测定影响的研究[J]. 北京林业大学学报, 2009, 31(3): 120-123.
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ZHANG Hou-jiang, WANG Chao-zhi, SU Juan. Influences of support styles on MOE determination of lumber with transverse vibration.[J]. Journal of Beijing Forestry University, 2009, 31(3): 120-123.
Citation: ZHANG Hou-jiang, WANG Chao-zhi, SU Juan. Influences of support styles on MOE determination of lumber with transverse vibration.[J]. Journal of Beijing Forestry University, 2009, 31(3): 120-123.
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支撑形式对振动式锯材弹性模量测定影响的研究

  • 1.

    北京林业大学工学院

Influences of support styles on MOE determination of lumber with transverse vibration.

  • 1.

    School of Technology, Beijing Forestry University, 100083, P. R. China.

  • 摘要: 基于横向振动原理的锯材弹性模量测量方法具有快速、无损、足尺测量等特点。该文讨论了两端刚性简支支撑和一端刚性、一端弹性支撑两种支撑形式下，锯材弹性模量检测的理论依据。在以实际生产应用为目标的检测仪器开发中，一端支撑要包含测力传感器，用于传感锯材的重量和振动信号。结果表明：测力传感器端的支撑相当于一种弹性支撑，它会造成试件固有频率测量值比实际值低，进而给试件弹性模量测量值带来误差。这一固有频率测量值减小幅度与试件--支撑刚度比有关：试件--支撑刚度比越小，减小幅度越小。一般情况下，如果将试件--支撑刚度比控制在0～0.005范围内，则会测得足够精确的弹性模量值。
    Abstract: Transverse vibration technique is a rapid and non-destructive method for determining the modulus of elasticity (MOE) of full size structural lumber. Two test theories of lumber MOE, including a simply supported beam with two rigid supports and a simply supported beam with one elastic support and one rigid support, were discussed in this paper. A vibration test system for practical lumber grading application usually includes a load cell, which is mounted on one of the supports to sense the vibration signals and to measure the weight of the lumber. The load cell support is a kind of elastic support, resulting in the resonant frequency smaller than the natural frequency of the lumber. Moreover, the data indicated that the smaller the specimen-to-support stiffness ratio was, the lower the decrement of the resonant frequency from the natural frequency was. The specimen-to-support stiffness ratio is suggested to be in the range of 0—0.005 for accuracy. 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出版历程
  • 收稿日期:  1900-01-01
  • 修回日期:  1900-01-01
  • 刊出日期:  2009-05-30

支撑形式对振动式锯材弹性模量测定影响的研究

  • 1. 北京林业大学工学院
  • 收稿日期: 1900-01-01
  • 修回日期: 1900-01-01
  • 刊出日期: 2009-05-30

摘要: 基于横向振动原理的锯材弹性模量测量方法具有快速、无损、足尺测量等特点。该文讨论了两端刚性简支支撑和一端刚性、一端弹性支撑两种支撑形式下，锯材弹性模量检测的理论依据。在以实际生产应用为目标的检测仪器开发中，一端支撑要包含测力传感器，用于传感锯材的重量和振动信号。结果表明：测力传感器端的支撑相当于一种弹性支撑，它会造成试件固有频率测量值比实际值低，进而给试件弹性模量测量值带来误差。这一固有频率测量值减小幅度与试件--支撑刚度比有关：试件--支撑刚度比越小，减小幅度越小。一般情况下，如果将试件--支撑刚度比控制在0～0.005范围内，则会测得足够精确的弹性模量值。

English Abstract

张厚江, 王朝志, 苏娟. 支撑形式对振动式锯材弹性模量测定影响的研究[J]. 北京林业大学学报, 2009, 31(3): 120-123.
引用本文: 张厚江, 王朝志, 苏娟. 支撑形式对振动式锯材弹性模量测定影响的研究[J]. 北京林业大学学报, 2009, 31(3): 120-123.
shu
ZHANG Hou-jiang, WANG Chao-zhi, SU Juan. Influences of support styles on MOE determination of lumber with transverse vibration.[J]. Journal of Beijing Forestry University, 2009, 31(3): 120-123.
Citation: ZHANG Hou-jiang, WANG Chao-zhi, SU Juan. Influences of support styles on MOE determination of lumber with transverse vibration.[J]. Journal of Beijing Forestry University, 2009, 31(3): 120-123.
shu

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