• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Computational Physics >A FINITE ELEMENT PROPAGATION MODEL FOR EXTRACTING NORMAL INCIDENCE IMPEDANCE IN NONPROGRESSIVE ACOUSTIC WAVE FIELDS
【24h】

A FINITE ELEMENT PROPAGATION MODEL FOR EXTRACTING NORMAL INCIDENCE IMPEDANCE IN NONPROGRESSIVE ACOUSTIC WAVE FIELDS

机译：用于提取非渐进声波场中正常入射阻抗的有限元传播模型

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

A propagation model method for extracting the normal incidence impedance of an acoustic material installed as a finite length segment in a wall of a duct carrying a nonprogressive wave field is presented. The method recasts the determination of the unknown impedance as the minimization of the normalized wall pressure error function. A finite element propagation model is combined with a coarse/fine grid impedance plane search technique to extract the impedance of the material. Results are presented for three different materials for which the impedance is known. For each material, the input data required for the prediction scheme were computed from modal theory and then contaminated by random error. The finite element method reproduces the known impedance of each material almost exactly for random errors typical of those found in many measurement environments. Thus, the method developed here provides a means for determining the impedance of materials in a nonprogressive wave environment such as that usually encountered in a commercial aircraft engine and in most laboratory settings. (C) 1996 Academic Press, Inc. [References: 11]
机译：提出了一种传播模型方法，用于提取作为有限长度段安装在承载非渐进波场的管道壁中的声学材料的法向入射阻抗。该方法将对未知阻抗的确定重铸为标准化壁压力误差函数的最小值。有限元传播模型与粗/细网格阻抗平面搜索技术相结合，以提取材料的阻抗。给出了阻抗已知的三种不同材料的结果。对于每种材料，预测方案所需的输入数据都是从模态理论计算出来的，然后被随机误差污染。有限元方法几乎可以精确再现每种材料的已知阻抗，以解决许多测量环境中常见的随机误差。因此，这里开发的方法提供了一种用于确定非渐进波环境中的材料阻抗的手段，例如在商用飞机发动机和大多数实验室环境中通常遇到的情况。 （C）1996 Academic Press，Inc. [参考：11]

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