自由锚杆中超声导波的衰减特征
文献类型：期刊论文
| 作者 | 陈兴长 ; 邹代华 ; 陈慧 |
| 刊名 | 西南科技大学学报
 |
| 出版日期 | 2009-12-15 |
| 卷号 | 24期号:4页码:56-62 |
| 关键词 | 锚杆 超声导波 无损检测 导波衰减 振幅比 |
| 其他题名 | Attenuation Characteristics of Ultrasonic Guided Wave in Free Rock Bolts |
| 合作状况 | 其它 |
| 中文摘要 | 为了研究自由锚杆中超声导波的衰减规律,分别制作了长度为800 mm、900 mm、1100 mm、1300 mm、1500 mm、1800 mm、2000 mm和2500 mm的锚杆。采用虚拟综合测试仪、声发射放大系统、R6α直传感探头和计算机,组装了超声导波无损检测系统。利用该系统分别对制作的锚杆进行了系统的导波测试。结果表明:自由锚杆中超声导波振幅呈负指数分布;不同频率的激发导波在测试频率段内(40~100 kHz)波包平均振幅的振幅比均在0.7左右,表明频率对导波衰减的影响不大;不同长度锚杆中波包平均振幅的振幅比也在0.7左右,表明锚杆长度对导波衰减的影响也不大;自由锚杆中导波的衰减,除与材料性质有关外,主要来自于设备本身的系统衰减。研究发现,导波振幅比比振幅绝对值更加稳定、可靠,可用来定量地表示导波振幅的衰减情况。 |
| 英文摘要 | Eight rock bolts,800 mm,900 mm,1100 mm,1300 mm,1500 mm,1800 mm,2000 mm and 2500 mm in length,respectively,were designed to investigate the attenuation characteristics by using a guided wave non-destructive test system,which included a Handy-scope,an amplifier,two R6α transducers and a computer.The results demonstrate that amplitudes of ultrasonic guided waves present a negative exponential distribution and the average amplitude ratios of all wave packets are near 0.7 within the range of the tested frequencies(40~100 kHz),which could be interpreted that the frequency of guided waves had little impact on attenuation.All of the average amplitude ratios of wave packets are near 0.7 with various bolt length too,which could be interpreted that the length of rock bolts had little impacts on attenuation in the tested range.It is understood that in addition to the nature of the material,attenuation of ultrasonic guided waves was mainly from setup energy loss in a free rock bolt.This study also suggest that the amplitude ratio is more stable and reliable than absolute amplitude value and it can be used to quantify the guided wave amplitude attenuation. |
| 资助信息 | 科技部重大国际科技合作专项资助(2006DFA21820);国家科技支撑计划项目资助(2006BAC10B04) |
| 语种 | 中文 |
| 公开日期 | 2010-09-19 |
| 源URL | [http://ir.imde.ac.cn/handle/131551/1988]  |
| 专题 | 成都山地灾害与环境研究所_成都山地所知识仓储（2009年以前） |
| 推荐引用方式 GB/T 7714 | 陈兴长,邹代华,陈慧. 自由锚杆中超声导波的衰减特征[J]. 西南科技大学学报,2009,24(4):56-62. |
| APA | 陈兴长,邹代华,&陈慧.(2009).自由锚杆中超声导波的衰减特征.西南科技大学学报,24(4),56-62. |
| MLA | 陈兴长,et al."自由锚杆中超声导波的衰减特征".西南科技大学学报 24.4(2009):56-62. |
入库方式： OAI收割
来源：成都山地灾害与环境研究所
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