2.5维C/SiC复合材料板弹性参数识别方法研究

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振动与冲击 ›› 2014, Vol. 33 ›› Issue (8) : 42-47.

论文

2.5维C/SiC复合材料板弹性参数识别方法研究

陆韬1,2，姜东1,2，吴邵庆1,2，费庆国1,2

作者信息 +

Elastic parameter identification of a 2.5D C/SiC composite plate

LU Tao1,2, JIANG Dong1,2, WU Shao-qing1,2, FEI Qing-guo1,2

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文章历史 +

摘要

以大型商业有限元软件NASTRAN为计算平台，提出了基于模态试验结果的2.5维C/SiC复合材料板弹性参数识别方法。基于复合材料板的模态试验结果，采用模型修正的思想构造优化问题，其中目标函数定义为实测模态频率与计算频率之差的平方和，将以刚度平均法获得的复合材料弹性参数的理论预测值作为优化问题的初值，充分利用了材料参数的先验信息，然后对材料参数进行灵敏度分析，通过迭代求解识别出复合材料板的弹性参数。识别后，C/SiC复合材料板第1-4阶模态频率的复现精度明显提高，并能保证第5-8阶模态频率的预示精度。研究结果表明，方法能准确识别2.5维编织C/SiC复合材料的弹性参数，并为复合材料等效建模以及进一步动态特性研究提供参考。

Abstract

By using the large commercial finite element software NASTRAN, a method that the elastic parameters of a 2.5D C/SiC composite plate are determined by parameter identification based on the modal test data is proposed in this paper. An optimization problem is formulated with the model updating technique in which the objective function is defined as the sum of squares of the discrepancy between measured and calculate modal frequencies, the initial value of the elastic parameters are obtained by adopting stiffness averaging method which makes full use of the prior information of the material parameters. Finally, the accurate elastic parameters of the composite plate are identified through a iteration process by using sensitivity analysis method. The accuracy of the first 1-4 modal frequencies of C/SiC composite plate are significantly improved by identification, while the predictive accuracy of the 5-8 modal frequencies can also be guaranteed. Results show that the proposed method can accurately identify the 2.5D C/SiC composite elastic parameters, and the method proposed in this paper can provide effective references for dynamic design and equivalent modeling of C/SiC composite.

导出引用

陆韬;姜东;吴邵庆;费庆国;. 2.5维C/SiC复合材料板弹性参数识别方法研究[J]. 振动与冲击, 2014, 33(8): 42-47

LU Tao;JIANG Dong;WU Shao-qing;FEI Qing-guo;. Elastic parameter identification of a 2.5D C/SiC composite plate[J]. Journal of Vibration and Shock, 2014, 33(8): 42-47