以对称层合板结构为对象,基于经典层合板理论,将其等效为单层各项异性板,采用FE-BEM法(hybrid finite element-boundary element method)分析了其在宽频噪声激励作用下的隔声特性.为验证等效方法的适用性,开展对称复合材料层合板模态测试和数值分析;为验证预估结论的正确性,将FE-BEM法结果与FE-SEA法(hybrid finite element-statistic energy analysis)结果、试验结果分别进行对比.结果表明:将等效方法用于对称层合板固有特性模拟是正确的,等效层合板的固有特性的仿真结果与试验值一致,误差在6.9％以内;等效方法和FE-BEM法结合进行对称层合板隔声预计是有效的,FE-BEM法预计结果与试验结果吻合良好;等效方法和FE-SEA法结合进行对称层合板隔声预计也是有效的,FE-BEM法比FE-SEA法所建模型计算耗时长,算例中计算耗时增大4.4％.
Sound insulation performance of laminates based on the equivalent method and FE-BEM
The sound insulation performance of symmetric laminate structure was estimated and verified by experiments.Based on the classical laminate theory,the symmetric laminate structure was equivalent to a single anisotropic plate,and its sound insulation characteristics under broadband noise excitation were analyzed by the FE-BEM(hybrid finite element-boundary element method).In order to verify the applicability of the equivalent method,modal experiments and numerical analyses of symmetric composite laminates were carried out.To verify the correctness of the predicted conclusions,FE-BEM results were compared with FE-SEA(hybrid finite element-statistic energy analysis)results and experimental results.The results showed that the equivalent method can correctly simulate the natural characteristics of symmetrical laminates,the simulation results were consistent with the experimental results and the corresponding error was 6.9％.The equivalent method combined with the FE-BEM was effective for sound insulation prediction of symmetric laminates,and the predicted results of the FE-BEM agreed well with the experimental results.The equivalent method combined with the FE-SEA method was effective for sound insulation prediction of symmetric laminates,the calculation time of FE-BEM model was more than FE-SEA model,and the calculation time increased by 4.4％.
万方数据
维普
