本文選題：Combin彈簧阻尼器單元 + 吸波邊界　； 參考：《玻璃鋼/復(fù)合材料》2017年08期

【摘要】：運(yùn)用Lamb波對復(fù)雜結(jié)構(gòu)進(jìn)行結(jié)構(gòu)健康監(jiān)測時(shí),經(jīng)常需要對Lamb波傳播過程進(jìn)行有限元仿真,但由于建模大小、復(fù)合材料各向異性等原因,會(huì)產(chǎn)生較多的邊界反射波,從而掩蓋損傷波形,因此建立吸收邊界抑制反射波的影響就顯得尤為重要。使用加入彈簧阻尼器Combin14單元的吸波邊界,研究了吸波邊界長度、頻率、Combin14單元方向等對該吸收邊界吸波效果的影響,并通過與傳統(tǒng)的阻尼遞增吸收邊界進(jìn)行對比,發(fā)現(xiàn)頻率和吸波邊界長度對彈簧阻尼器吸波邊界吸波效果均無過大影響,但其吸波邊界長度必須大于λ(波長)才會(huì)達(dá)到最優(yōu)效果;當(dāng)Combin14單元設(shè)置在沿傳播方向時(shí)的吸波效果最好;相較于阻尼遞增吸波邊界,彈簧阻尼器吸波邊界的仿真耗時(shí)明顯減少且在低頻段的吸波效果更好。
[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.
【作者單位】： 鄭州大學(xué)機(jī)械工程學(xué)院;
【基金】：國家自然科學(xué)基金(U1333201) 河南省科技攻關(guān)項(xiàng)目(152102210039)
【分類號】：TB33

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本文編號：1886099