Veres István A, Sayir Mahir B
Swiss Federal Institute of Technology, Institute of Mechanical Systems, Center of Mechanics, ETH Zentrum, Zürich CH-8092, Switzerland.
Ultrasonics. 2004 Apr;42(1-9):495-9. doi: 10.1016/j.ultras.2004.01.027.
In this paper we will present a method to determine the material properties of a wooden bar with rectangular cross-section using guided waves in the measurement. We modelled the wood as an orthotropic material with nine independent constants. We determined the dispersion curves theoretically in the three-dimensional case using a semi-analytical finite element method. In our laboratory we excited transversal and longitudinal waves in wooden bars of 2.5-4 m length by piezoceramic transducers. We measured the displacement or the velocity of the surface of the bar by a laser-interferometer. The dispersion curves of the bar are determined from the measurement by the linear prediction method. We related the dispersion curves and the material properties. We found the material properties by parametric model fitting.
在本文中，我们将介绍一种在测量中使用导波来确定具有矩形横截面的木杆材料特性的方法。我们将木材建模为具有九个独立常数的正交各向异性材料。我们使用半解析有限元方法在三维情况下从理论上确定了色散曲线。在我们的实验室中，我们通过压电陶瓷换能器在长度为2.5 - 4米的木杆中激发横向波和纵向波。我们通过激光干涉仪测量木杆表面的位移或速度。通过线性预测方法从测量中确定木杆的色散曲线。我们将色散曲线与材料特性联系起来。我们通过参数模型拟合来确定材料特性。
