水下主动电场定位系统的有限元仿真
发布时间：2018-12-24 08:32
【摘要】：弱电鱼利用自身器官放电在周围建立电场并感知电场信息的变化。仿生学者由此引申出了主动电场定位技术。课题组搭建了主动电场实验系统,并依据该系统做了大量实验研究,主要包括水下物体定位和液体输送管道缺陷检测。本文在这些实验及结果的基础上,利用Ansoft Maxwell仿真软件进行计算,将计算结果处理后与实验结果相对比,由此验证主动电场定位技术能够用于水下物体的定位和液体输送管道的缺陷检测。本文研究内容主要有以下几点:1.建立了水下物体材料特性研究的二维和三维仿真模型,对绝缘材料、金属材料的圆柱体分别选取一组特定频率的激励进行二维和三维的计算。根据定位曲线可以看出,绝缘材料定位曲线呈凸起形状,峰值位置即为被测物体中心位置,检测过程与实验一样没有出现转折频率现象;金属材料定位曲线呈凹形形状,波谷位置即为被测物体中心位置,但检测过程没有出现实验出现的转折频率现象。2.对不同材料的管道泄漏和堵塞在内部为淡水,外部环境为水、土时分别建立仿真模型进行计算。金属管道的泄漏、堵塞、绝缘管道的泄漏和堵塞无论在那种外部环境,定位曲线均呈现出各自一致的形状,且曲线中均具有明显的最大值特征信号,根据此特征信号便可准确定位管道缺陷的位置。3.选取常见的管道输送液体材料,建立合适的管道泄漏、堵塞模型,在外部环境为空气、水、土时分别添加合适激励进行计算。根据定位曲线可以看出,在管道缺陷的位置,曲线出现明显最大值特征信号。4.输送液体管道的导电性和管道缺陷类型决定了定位曲线的趋势。激励的幅值决定了接收电压的大小,激励的频率大小决定了能否成功检测管道的缺陷。当输送液体的电导率较大时,管道的外部环境气、水、土对电场影响都很微弱;当输送液体的电导率较小时,管道外部环境空气、水、土的影响依次增大;管道堵塞比管道泄漏对外部环境的抗干扰能力较强。对电场影响较大时需加大激励频率。电场分析时需整体考虑,这为研究主动电场耦合与解耦提供了数据基础。通过对仿真结果的处理并对比实验结果,验证了主动电场定位技术能够实现水下物体的准确定位;能够对多种液体输送管道的缺陷检测,并定位到缺陷的位置。为该技术更深入的研究和实现工程化的应用奠定了基础。
[Abstract]:Weak-electric fish use their own organ discharge to create electric field around and perceive the change of electric field information. Bionics have thus developed an active electric field location technique. The active electric field experimental system was built, and a lot of experiments were done according to the system, including underwater object location and liquid pipeline defect detection. On the basis of these experiments and results, this paper makes use of the Ansoft Maxwell simulation software to calculate, and compares the calculated results with the experimental results after processing. It is verified that the active electric field positioning technique can be used to locate underwater objects and detect the defects of liquid pipeline. The main contents of this paper are as follows: 1. Two and three dimensional simulation models of material characteristics of underwater objects are established. The two dimensional and three dimensional excitations of insulating material and metal material cylinder are calculated by selecting a set of specific frequency excitations respectively. It can be seen from the positioning curve that the position curve of insulation material is protruding, the peak position is the center position of the object being measured, and there is no turning frequency phenomenon in the detection process as in the experiment. The position curve of metal material is concave, and the position of wave trough is the center position of the object being measured, but there is no turning frequency phenomenon in the detection process. 2. The leakage and blockage of pipelines with different materials are calculated by establishing simulation models when the internal and external environments are water and soil respectively. The leakage, blockage, leakage and blockage of metal pipes, no matter what kind of external environment, the localization curves show their own uniform shapes, and there are obvious maximum characteristic signals in the curves. According to this characteristic signal, the location of pipeline defects can be accurately located. 3. A suitable pipeline leakage and clogging model was established by selecting common pipeline materials for conveying liquid. Appropriate excitation was added to calculate the external environment when air, water and soil were added respectively. According to the positioning curve, it can be seen that in the location of pipeline defects, the curve has obvious maximum characteristic signal. 4. 4. The conductivity of liquid pipeline and the type of pipeline defects determine the trend of the orientation curve. The amplitude of excitation determines the size of receiving voltage and the frequency of excitation determines whether the defect of pipeline can be detected successfully. When the conductivity of the conveying liquid is high, the influence of gas, water and soil on the electric field is very weak, and the influence of air, water and soil on the external environment of the pipeline increases in turn when the conductivity of the conveying liquid is small. Pipeline blockage is better than pipeline leakage in anti-interference to external environment. The excitation frequency should be increased when the electric field is affected greatly. The analysis of electric field should be considered as a whole, which provides a data basis for the study of active electric field coupling and decoupling. By processing the simulation results and comparing the experimental results, it is verified that the active electric field positioning technology can realize the accurate positioning of underwater objects, and can detect and locate the defects in various liquid delivery pipelines. It lays a foundation for further research and engineering application of this technology.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE973.6;TP391.9
本文编号：2390406
[Abstract]:Weak-electric fish use their own organ discharge to create electric field around and perceive the change of electric field information. Bionics have thus developed an active electric field location technique. The active electric field experimental system was built, and a lot of experiments were done according to the system, including underwater object location and liquid pipeline defect detection. On the basis of these experiments and results, this paper makes use of the Ansoft Maxwell simulation software to calculate, and compares the calculated results with the experimental results after processing. It is verified that the active electric field positioning technique can be used to locate underwater objects and detect the defects of liquid pipeline. The main contents of this paper are as follows: 1. Two and three dimensional simulation models of material characteristics of underwater objects are established. The two dimensional and three dimensional excitations of insulating material and metal material cylinder are calculated by selecting a set of specific frequency excitations respectively. It can be seen from the positioning curve that the position curve of insulation material is protruding, the peak position is the center position of the object being measured, and there is no turning frequency phenomenon in the detection process as in the experiment. The position curve of metal material is concave, and the position of wave trough is the center position of the object being measured, but there is no turning frequency phenomenon in the detection process. 2. The leakage and blockage of pipelines with different materials are calculated by establishing simulation models when the internal and external environments are water and soil respectively. The leakage, blockage, leakage and blockage of metal pipes, no matter what kind of external environment, the localization curves show their own uniform shapes, and there are obvious maximum characteristic signals in the curves. According to this characteristic signal, the location of pipeline defects can be accurately located. 3. A suitable pipeline leakage and clogging model was established by selecting common pipeline materials for conveying liquid. Appropriate excitation was added to calculate the external environment when air, water and soil were added respectively. According to the positioning curve, it can be seen that in the location of pipeline defects, the curve has obvious maximum characteristic signal. 4. 4. The conductivity of liquid pipeline and the type of pipeline defects determine the trend of the orientation curve. The amplitude of excitation determines the size of receiving voltage and the frequency of excitation determines whether the defect of pipeline can be detected successfully. When the conductivity of the conveying liquid is high, the influence of gas, water and soil on the electric field is very weak, and the influence of air, water and soil on the external environment of the pipeline increases in turn when the conductivity of the conveying liquid is small. Pipeline blockage is better than pipeline leakage in anti-interference to external environment. The excitation frequency should be increased when the electric field is affected greatly. The analysis of electric field should be considered as a whole, which provides a data basis for the study of active electric field coupling and decoupling. By processing the simulation results and comparing the experimental results, it is verified that the active electric field positioning technology can realize the accurate positioning of underwater objects, and can detect and locate the defects in various liquid delivery pipelines. It lays a foundation for further research and engineering application of this technology.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE973.6;TP391.9
【参考文献】
相关期刊论文 前1条
1 孙良;王建林;赵利强;;负压波法在液体管道上的可检测泄漏率分析[J];石油学报;2010年04期
，本文编号：2390406
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