| 层状介质波动问题的时域边界元模型及实验 |
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| 引用本文： | 刘海笑,张楚汉.层状介质波动问题的时域边界元模型及实验[J].清华大学学报(自然科学版),2002,42(2):270-273. |
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| 作者姓名： | 刘海笑 张楚汉 |
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| 作者单位： | 1. 天津大学,建筑工程学院,港口工程系,天津,300072
2. 清华大学,水利水电工程系,北京,100084 |
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| 基金项目： | 国家自然科学基金资助项目 ( 195 72 0 35 ) |
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| 摘 要： | 建立了研究层状介质波动问题的时域边界元计算模型。为考察其精度和稳定性 ,对受冲击载荷作用的简单分层平板同时进行了动态光弹性和动态焦散线实验。由动态光弹性实验获取的系列双折射条纹相片反映出波动在层状介质中的传播、反射和透射特性 ,而动态焦散线实验为相应的时域边界元计算提供了精确的冲击载荷曲线。通过比较分别由实验和计算得到的在多个测点处双折射条纹级数的变化历程 ,对上述计算模型的适用性和可靠性进行了验证
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| 关 键 词： | 层状介质 波动 时域边界元 动态光弹性 动态焦散线 实验验证 |
| 文章编号： | 1000-0054(2002)02-0270-04 |
| 修稿时间： | 2000年8月30日 |
Time domain BEM for wave propagationproblems in layered media and experimental verifications |
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| LIU Haixiao ,ZHANG Chuhan.Time domain BEM for wave propagationproblems in layered media and experimental verifications[J].Journal of Tsinghua University(Science and Technology),2002,42(2):270-273. |
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| Authors: | LIU Haixiao ZHANG Chuhan |
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| Institution: | LIU Haixiao 1,ZHANG Chuhan 2 |
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| Abstract: | A time domain boundary element model (BEM) is presented for wave propagation problems in layered media. Then, a simple layered plate under impact loading is studied experimentally using dynamic photoelasticity and dynamic caustics to investigate the models accuracy and stability. The propagation, reflection and transmission of wave motions in the layered media are shown in a series of dynamic birefringent fringe patterns from the dynamic photoelasticity measurements. An accurate impact loading curve is obtained from the dynamic caustics for the BEM computations. The calculated time histories of birefringent fringe orders at several specific points agree well with the experimental results, which verifies the reliability of the computational model for solving such wave propagation problems in layered media. |
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| Keywords: | layered media wave propagation time domain boundary element model (BEM) dynamic photoelasticity dynamic caustics experimental verification |
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