基于反射系数建模的层状CFRP超声共振特性研究

发布时间：2018-03-11 16:42

  本文选题：碳纤维复合材料　切入点：超声脉冲反射信号　出处：《振动与冲击》2016年12期 　论文类型：期刊论文

【摘要】：对层状碳纤维复合材料(CFRP)超声反射系数进行建模并研究超声波在CFRP内的共振特性。首先建立了声波在多层介质中传播时的反射系数频响模型;在此基础上对多层CFRP反射系数频域响应进行数值计算并对反射系数频响随CFRP层数的变化特征进行分析;结果表明使用中心频率接近层状CFRP固有共振频率的超声探头进行检测时,超声波在层状CFRP中将产生共振现象;在CFRP层数较少时,共振结构噪声中会夹杂其他频率的信号成分。随着CFRP层数增加,共振结构噪声在信号共振区域的占比将会提高;当CFRP层数增加到一定数量后,共振结构噪声将只在离超声波入射表面较近的区域出现;随着超声波远离入射表面,共振结构噪声将逐渐消失。最后对薄板型CFRP和厚截面CFRP的实验信号进行分析,得到的实验结果和数值计算结果相一致。
[Abstract]:The ultrasonic reflection coefficients of layered carbon fiber composites (CFRP) were modeled and the resonance characteristics of ultrasonic waves in CFRP were studied. On this basis, the frequency domain response of multilayer CFRP reflection coefficient is numerically calculated and the characteristics of reflection coefficient frequency response with the number of CFRP layers are analyzed. The results show that the ultrasonic probe with center frequency close to the inherent resonance frequency of layered CFRP is used to detect the frequency response. Ultrasonic wave will produce resonance phenomenon in layered CFRP, when the number of CFRP layers is small, the resonance structural noise will include other frequency signal components. With the increase of CFRP layer number, the proportion of resonance structural noise in the resonance region will increase. When the number of CFRP layers increases to a certain number, the resonant structural noise will only appear in the area near the incident surface of the ultrasonic wave, as the ultrasonic wave is far away from the incident surface, The resonant structural noise will gradually disappear. Finally, the experimental signals of thin plate CFRP and thick section CFRP are analyzed, and the experimental results are in agreement with the numerical results.
【作者单位】： 浙江大学流体动力与机电系统国家重点实验室;中国计量学院计量测试工程学院;
【基金】：国家自然科学基金资助项目(51075358) 浙江省自然科学基金资助项目(LY14E050013) 浙江省‘仪器科学与技术’重中之重学科开放基金资助项目(JL130112)
【分类号】：TB33

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