• 主题
高级搜索  >
历史搜索 清空历史
首页> 美国政府科技报告 >Precursor Waves from a Continuous Transition Layer in the Sound Speed Profile
【24h】

Precursor Waves from a Continuous Transition Layer in the Sound Speed Profile

机译：声速曲线中连续转换层的前驱波

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

If a sound speed profile exhibits a relatively abrupt transition between two more or less uniform regions of differing sound speeds, it is often observed that among the signals produced by a distant sound source is one which arrives earlier than all others. This type of signal, which has been variously referred to as the precursor wave, the lateral wave or the head wave, is not explainable on the basis of ray acoustics. In the past, theoretical investigations have been made of the formation of precursors on both sharply abrupt and continuous transition layers. Following the methods of Lang, the author considers the precursors arising from a point sound source located in a homogeneous half-space connected to another isovelocity domain of higher sound speed through a transition zone in which the square of the index of refraction is a linear function of height. High frequency asymptotic expressions for the precursor pressures are developed for both the transition zone and the half-space in which the sound source is located. By means of Fourier transformation, the treatment is extended to include transient sound sources. (Author)

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