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本文介绍采用实验模态测量法及有限元法研究由四周固定支承的梯形板内裂缝引起的模态参数的变化规律。实验模态测量以锤击法激励,采用近场话筒拾振。有限元法计算用ADINA程序包完成。这两种方法得到的结果非常一致。研究证明裂缝的长度和角度对板的固有频率无明显影响。
In this paper, we use the experimental modal measurement method and the finite element method to study the variation of the modal parameters caused by the cracks in trapezoidal plates that are fixedly supported on four sides. The experimental modal measurements were motivated by a hammering method and were picked up by a near-field microphone. The finite element method is calculated using the ADINA package. The results obtained by these two methods are very consistent. Studies have shown that the length and angle of the crack have no significant effect on the natural frequency of the board.