吸波边界对Lamb波在复合材料中传播的影响研究

发布时间：2018-05-14 03:18

本文选题：Combin弹簧阻尼器单元 + 吸波边界　；参考：《玻璃钢/复合材料》2017年08期

【摘要】：运用Lamb波对复杂结构进行结构健康监测时,经常需要对Lamb波传播过程进行有限元仿真,但由于建模大小、复合材料各向异性等原因,会产生较多的边界反射波,从而掩盖损伤波形,因此建立吸收边界抑制反射波的影响就显得尤为重要。使用加入弹簧阻尼器Combin14单元的吸波边界,研究了吸波边界长度、频率、Combin14单元方向等对该吸收边界吸波效果的影响,并通过与传统的阻尼递增吸收边界进行对比,发现频率和吸波边界长度对弹簧阻尼器吸波边界吸波效果均无过大影响,但其吸波边界长度必须大于λ(波长)才会达到最优效果;当Combin14单元设置在沿传播方向时的吸波效果最好;相较于阻尼递增吸波边界,弹簧阻尼器吸波边界的仿真耗时明显减少且在低频段的吸波效果更好。
[Abstract]:When using Lamb wave to monitor the structure health of complex structures, it is often necessary to simulate the Lamb wave propagation process by finite element method. However, due to the size of modeling and anisotropy of composite materials, more boundary reflection waves are produced. Therefore, it is very important to establish an absorbing boundary to suppress the influence of reflection wave. Using the absorbing boundary of Combin14 element with spring damper, the effects of absorbing boundary length, frequency and direction of element Combin14 on the absorbing effect of the absorbing boundary are studied, and compared with the traditional damping incremental absorbing boundary. It is found that the frequency and the absorbing boundary length have no great influence on the absorbing effect of the spring damper, but the absorbing boundary length must be larger than 位 (wavelength) to achieve the optimal effect. When the Combin14 element is set along the propagation direction, the absorbing effect is the best. Compared with the damping increasing absorbing boundary, the simulation time of the spring damper absorbing boundary is obviously reduced and the absorbing effect is better in the low frequency range.
【作者单位】：郑州大学机械工程学院;
【基金】：国家自然科学基金(U1333201) 河南省科技攻关项目(152102210039)
【分类号】：TB33

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