【作者】 刘琦；

【导师】 章继峰； 王超；

【作者基本信息】 哈尔滨工程大学 ， 工程硕士（专业学位）， 2017， 硕士

【摘要】 超声导波技术在近当代工业中的利用越来越广泛。譬如在无损检测领域,超声导波技术已经成为最为常用的一种技术手段。与其他常规检测手段相比,超声导波检测技术具有很多优势。当然,超声导波检测除了应用在无损检测领域外,还有其他非常广阔的应用空间。本文所研究的内容主体是超声导波相关的波导结构频散理论与覆冰板面的结冰检测技术。本文所研究的问题主要有两个:波导结构的频散问题与覆冰板问题。论文采用理论推导、有限元仿真以及实验相结合的方法对两个问题分别进行展开研究,并在文章结尾提出了一种结冰检测和定位的方案设想。对于第一个问题,本文先从导波理论的层面对波导结构的频散进行理论分析和求解,之后借助有限元方法利用特征频率法对不同附冰层厚度的铝板进行频散曲线求解。对于覆冰板问题,本文所研究的主要内容是覆冰层对超声导波在介质层中传播过程中能量耗散的影响。这一内容的研究方法将有限元仿真方法与实验验证方法相整合。而覆冰板的相关内容需要借用有多物理场软件Comsol Multiphysics 5.0来完成。而本文的试验是验证类的实验,因此实验设计需要尽量接近有限元模型。通过以上两个问题的研究,我们得到了一些金属结冰板的波导结构频散以及导波的能量耗散的有关规律。基于此,笔者在第5章提出了一个板面覆冰层位置定位的方案。但此设想还不完善,需要进一步深入研究。更多还原

【Abstract】 The application of ultrasonic guided-wave testing technology is becoming more and more widely in modern industry.Now the ultrasonic guided-wave testing technology has become the most commonly used method of the non-destructive testing technology.Compared with other conventional detection methods,the ultrasonic guided-wave testing method has many advantages.Of course,in addition to the application in the field of the non-destructive testing technology,the ultrasonic guide-wave technology has been used in many other fields.The theme of this article is the ultrasonic guided waves theory and technology.Otherwise,the main contents of this article contain two questions: the dispersion of the waveguide structures and the problem of the ice attacted to the plate.In this paper,the main research methods: the theoretical derivation;the finit element method simulation;the experimental method.In addition,I put forward a scheme to detect and locate the ice attached to the plate at the end of the paper.Due to the first problem,the article first solves the dispersion of waveguide structure by the method of theoretical derivation.Then I solve the dispersion curve of aluminum sheet with different thickness ice layer by the break-point frequency method.According to the problem of the plate attached to an ice layer,the main content of this paper is to study the effect of ice on the energy dissipation in the propagation of ultrasonic guided waves in the dielectric layer.The research way used in this section is a method which combines finite element simulation method and experimental verification.The content of finite element simulation needs to be completed by using finite element sofeware Comsol Multiphysics 5.0.Another point is that the design of the experiments in this section needs to be as close as possible to the finite element model.By studying of the above two problems,we have obtained some rules about the dispersion of the waveguide structure and the energy dissipation of guided waves.Based on that,in the fifth chapter,the author puts forward a plan for the location of ice sheet attached to the surface.However,this assumption is not perfect and needs to be studied further.更多还原