...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Earthquake Engineering >Shock Response from Pseudodynamic Test Using Momentum Equations of Motion
【24h】

Shock Response from Pseudodynamic Test Using Momentum Equations of Motion

机译：使用动量方程的拟动力试验的冲击响应

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The feasibility of using pseudodynamic techniques to yield shock responses from impulses is studied herein. A direct integration method is often used to solve the force equation of motion in performing a conventional pseudodynamic test. However, this technique might not be applicable to obtain an accurate shock response from an impulse as a load discontinuity occurs at the end of the impulse. This is because this discontinuity will lead to an extra amplitude distortion and the amount of this amplitude distortion is increased with the increase of time step. Hence, a small time step is needed to reduce the extra amplitude distortion anu thus the displacement increment for each time step might be smaller than or as small as the resolution of the displacement transducer. As a result, the displacement increment cannot be accurately imposed upon the specimen and the responses will be contaminated by the noise. In addition, the test duration is drastically increased. Alternatively, this difficulty might be overcome if the momentum equation of motion instead of the force equation of motion is solved pseudodynamically. Hence, an external momentum is used in the solution of the momentum equation of motion. Since the external momentum is a resultant of the time integration of the external force the discontinuity problem will automatically disappear. Consequently, reliable shock responses can be obtained from pseudodynamic tests.
机译：本文研究了使用拟动力技术从脉冲产生冲击响应的可行性。在执行常规的伪动力学测试时，通常使用直接积分法来求解运动的力方程。但是，由于负载的不连续发生在脉冲的末端，因此该技术可能不适用于从脉冲获得准确的冲击响应。这是因为这种不连续会导致额外的幅度失真，并且该幅度失真的量会随着时间步长的增加而增加。因此，需要一个小的时间步长来减少额外的幅度失真和振幅，因此每个时间步长的位移增量可能小于或小于位移传感器的分辨率。结果，位移增量不能精确地施加到样本上，并且响应将被噪声污染。另外，测试持续时间大大增加。替代地，如果以伪动力学方式解决了运动的动量方程而不是运动的力方程，则可以克服该困难。因此，在运动的动量方程的解中使用了外部动量。由于外部动量是外力时间积分的结果，所以不连续性问题将自动消失。因此，可以从拟动力试验获得可靠的冲击响应。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号