| 动力刚化问题的实验研究 |
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| 引用本文： | 杨辉,洪嘉振,余征跃.动力刚化问题的实验研究[J].力学学报,2004,36(1):0-124. |
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| 作者姓名： | 杨辉 洪嘉振 余征跃 |
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| 作者单位： | 中科院力学所高温气动实验室, 100080 |
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| 基金项目： | 国家自然科学基金重点资助项目(19832040)，国家教委博士点专项科研基金资助项目(2000024818)~~ |
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| 摘 要： | 应用频散可控耗散格式对环形激波在圆柱形激波管内绕射、反射和聚焦
的问题进行了数值模拟研究. 研究结果表明环形激波形成强烈聚焦的关键因素是环形激波在
圆柱形管道中向对称轴运动时，绕射激波就不断加速而不作通常情况下的衰减；不同马赫数
的环形激波绕射也产生不同马赫数及形状的准柱形激波，导致聚焦效果和位置的差异；另外，
环形激波聚焦于一个点而圆柱形激波聚焦于一条线,两者有本质不同.
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| 关 键 词： | 动力刚化 柔性梁 动力学 频率 黏性阻尼 风阻 |
| 修稿时间： | 2002年4月28日 |
EXPERIMENTAL INVESTIGATION ON DYNAMIC STIFFENING PHENOMENON |
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| Yang Hui Hong Jiazhen Yu Zhengyue.EXPERIMENTAL INVESTIGATION ON DYNAMIC STIFFENING PHENOMENON[J].chinese journal of theoretical and applied mechanics,2004,36(1):0-124. |
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| Authors: | Yang Hui Hong Jiazhen Yu Zhengyue |
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| Abstract: | The study on "dynamic stiffening" is currently a focus in the field of flexible multibody system dynamics. A lot of valuable researches have been done to account for "dynamic stiffening" via mathematical model and numerical simulation. However, to one's surprise, never had experimental investigations on this problem been reported. This paper presents experimental investigation on "dynamic stiffening" phenomenon. The experiment is based on the prototype of a rotating cantilever beam that is often used to discuss the effects of "dynamic stiffening". The experimental investigation is conducted on a single-axis air-bearing testbed. A theory model incorporating the effects of both viscous damping and air drag force is also developed for the purpose of comparison with experimental results. The phenomenon of "dynamic stiffening" is verified by the results of experiment. The validation of the proposed model is confirmed by the experiment, too. |
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| Keywords: | dynamic stiffening flexible beam dynamics frequency viscous damping air drag force |
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