钢绞线中纵向模态传播特性的实验研究  

Experimental Research on Propagation Characteristics of Longitudinal Modes in Steel Strands

作　　者：刘增华[1] 何存富[1] 王秀彦[1] 吴斌[1] 

机构地区：[1]北京工业大学机械工程与应用电子技术学院,北京100022

出　　处：《北京工业大学学报》2008年第9期897-901,共5页Journal of Beijing University of Technology

基　　金：国家自然科学基金(10602004);北京市自然科学基金项目(4052008);北京工业大学博士科研启动项目(52001013200701);北京市优秀人才培养专项资助项目(20081B0501500173)

摘　　要：为了对钢绞线进行缺陷检测和应力测量,研究了超声导波纵向模态在钢绞线中的传播特性.首先对钢绞线不同钢丝中纵向模态的频散和多模态等特性进行了理论分析.然后在理论指导下,在长15 m且标称直径17.80 mm的7芯钢铰线、单根外围钢丝和中心钢丝中,分别进行了纵向模态的激励接收实验.确定在自由钢绞线中纵向模态主要在外围钢丝中传播.在频段0～400kHz部分频率下,最低阶纵向模态L(0,1)在钢绞线、外围钢丝和中心钢丝中得到的传播速度与理论值较为吻合.Propagation characteristics of longitudinal modes of ultrasonic guided waves are investigated theoretically and experimentally for the purpose of defect detection and stress measurement in steel strands. The characteristics, such as dispersion and multi-mode, of longitudinal modes for different kinds of wires in steel strands are analyzed theoretically. In the experiment, longitudinal modes are excited and received in a 15 meter long, 17.80 mm nominal diameter steel strand and its helical wire and center wire in the experiment under the theoretical guidance. When longitudinal modes excited in free steel strands, their main energy propagates in helical wires. At partial frequencies in the frequency range of 0- 400 kHz, experimental propagation velocities of L （0.1 ） mode, the lowest longitudinal mode, in the steel strand and its helical wire and center wire are well agreement with theoretical prediction.

关 键 词：传播特性 导波 模态 频散 

分 类 号：TB132[理学—物理] TB559[理学—应用物理]