• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>NDT & E international >Assessing wood in sounding boards considering the ratio of acoustical anisotropy
【24h】

Assessing wood in sounding boards considering the ratio of acoustical anisotropy

机译：考虑声学各向异性的比率评估音板中的木材

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 main objective of this study was to investigate the versatility of the ratios in longitudinal sound velocity to transverse as acoustic indicators. Due to independent factors of density, ring-width and extractive content, these indicator ratios were investigated and defined in terms of damping and acoustical coefficient in timbers of Morns alba and Cupressus arizonica planted in Iran. Experiments were replicated for five times in different locations from pith to bark of the trunks. In C. arizonica specimens, the major definition was made in terms of reverse correlation coefficients between indicator ratios and damping. Higher indicator ratios were subjected to lower damping which were affected by ring-width variations where no significant correlations were obtained between indicator ratios and acoustical coefficients. However, narrower rings were observed in specimens with smaller damping and higher indicator ratios in C. arizonica. In M. alba specimens, higher values of indicator ratios showed higher values of acoustical coefficients which were affected by total extractive content variations. In contrast to C. arizonica, no significant correlations were identified between indicator ratios and damping coefficient in M. alba. Smaller amounts of extractive content were observed in specimens with higher indicator ratios and acoustical coefficients.
机译：这项研究的主要目的是研究纵向声速与横向声比之比作为声学指标的通用性。由于密度，环宽和提取物含量的独立因素，对这些指标比率进行了调查，并根据在伊朗种植的Morns alba和Cupressus arizonica木材的阻尼和声学系数进行了定义。从树干的髓到树皮，在不同的位置重复进行了五次实验。在C. arizonica标本中，主要定义是根据指示剂比率与阻尼之间的反向相关系数确定的。较高的指示符比率受到较低的阻尼，这受环宽变化的影响，其中在指示符比率和声学系数之间未获得显着的相关性。但是，在亚利桑那假单胞菌中，在具有较小阻尼和较高指示剂比率的样品中观察到较窄的环。在白僵菌样品中，指示剂比率的值越高，表示的声学系数值越高，受总提取物含量变化的影响。与C. arizonica相比，在M. alba中没有发现指标比率与阻尼系数之间的显着相关性。在具有较高指示剂比率和声学系数的标本中，观察到少量的提取物。

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