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首页> 外文会议>Annual Symposium on Quantitative Nondestructive Evaluation; 19980719-24; Snowbird,UT(US) >ENERGY VELOCITY AND GROUP VELOCITY FOR GUIDED WAVES PROPAGATING WITHIN AN ABSORBING OR NON-ABSORBING PLATE IN VACUUM
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ENERGY VELOCITY AND GROUP VELOCITY FOR GUIDED WAVES PROPAGATING WITHIN AN ABSORBING OR NON-ABSORBING PLATE IN VACUUM

机译：真空中吸收或非吸收板内传播的导波的能量速度和群速度

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摘要

The energy velocity of waves guided in plates, such as Lamb waves, has been studied. Vectors of energy within the plate have been calculated and have been integrated to give the energy velocity of the wave modes. It has been shown that when there is no attenuation of the waves, then the conventional group velocity expression agrees perfectly with the energy velocity. However when there is attenuation, which can be due to leakage from an immersed plate or to material damping, then the group velocity expression does not represent the energy velocity. This finding has also been confirmed experimentally using a lossy plastic plate, the measured results agreeing well with the predicted energy velocity.
机译：已经研究了在板中引导的波（例如兰姆波）的能量速度。计算了板内的能量矢量，并将其积分以给出波模的能量速度。已经表明，当没有波的衰减时，传统的群速度表达式与能量速度完全吻合。但是，当存在衰减时，这可能是由于浸入板的泄漏或材料阻尼引起的，则群速度表达式不代表能量速度。使用有损塑料板也已通过实验证实了这一发现，测量结果与预测的能量速度非常吻合。

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