支撑形式对振动式锯材弹性模量测定影响的研究

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。 

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

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...