水下主動電場定位系統(tǒng)的有限元仿真
發(fā)布時間：2018-12-24 08:32
【摘要】：弱電魚利用自身器官放電在周圍建立電場并感知電場信息的變化。仿生學者由此引申出了主動電場定位技術(shù)。課題組搭建了主動電場實驗系統(tǒng),并依據(jù)該系統(tǒng)做了大量實驗研究,主要包括水下物體定位和液體輸送管道缺陷檢測。本文在這些實驗及結(jié)果的基礎(chǔ)上,利用Ansoft Maxwell仿真軟件進行計算,將計算結(jié)果處理后與實驗結(jié)果相對比,由此驗證主動電場定位技術(shù)能夠用于水下物體的定位和液體輸送管道的缺陷檢測。本文研究內(nèi)容主要有以下幾點:1.建立了水下物體材料特性研究的二維和三維仿真模型,對絕緣材料、金屬材料的圓柱體分別選取一組特定頻率的激勵進行二維和三維的計算。根據(jù)定位曲線可以看出,絕緣材料定位曲線呈凸起形狀,峰值位置即為被測物體中心位置,檢測過程與實驗一樣沒有出現(xiàn)轉(zhuǎn)折頻率現(xiàn)象;金屬材料定位曲線呈凹形形狀,波谷位置即為被測物體中心位置,但檢測過程沒有出現(xiàn)實驗出現(xiàn)的轉(zhuǎn)折頻率現(xiàn)象。2.對不同材料的管道泄漏和堵塞在內(nèi)部為淡水,外部環(huán)境為水、土時分別建立仿真模型進行計算。金屬管道的泄漏、堵塞、絕緣管道的泄漏和堵塞無論在那種外部環(huán)境,定位曲線均呈現(xiàn)出各自一致的形狀,且曲線中均具有明顯的最大值特征信號,根據(jù)此特征信號便可準確定位管道缺陷的位置。3.選取常見的管道輸送液體材料,建立合適的管道泄漏、堵塞模型,在外部環(huán)境為空氣、水、土時分別添加合適激勵進行計算。根據(jù)定位曲線可以看出,在管道缺陷的位置,曲線出現(xiàn)明顯最大值特征信號。4.輸送液體管道的導電性和管道缺陷類型決定了定位曲線的趨勢。激勵的幅值決定了接收電壓的大小,激勵的頻率大小決定了能否成功檢測管道的缺陷。當輸送液體的電導率較大時,管道的外部環(huán)境氣、水、土對電場影響都很微弱;當輸送液體的電導率較小時,管道外部環(huán)境空氣、水、土的影響依次增大;管道堵塞比管道泄漏對外部環(huán)境的抗干擾能力較強。對電場影響較大時需加大激勵頻率。電場分析時需整體考慮,這為研究主動電場耦合與解耦提供了數(shù)據(jù)基礎(chǔ)。通過對仿真結(jié)果的處理并對比實驗結(jié)果,驗證了主動電場定位技術(shù)能夠?qū)崿F(xiàn)水下物體的準確定位;能夠?qū)Χ喾N液體輸送管道的缺陷檢測,并定位到缺陷的位置。為該技術(shù)更深入的研究和實現(xiàn)工程化的應用奠定了基礎(chǔ)。
[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.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TE973.6;TP391.9
本文編號：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.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TE973.6;TP391.9
【參考文獻】
相關(guān)期刊論文 前1條
1 孫良;王建林;趙利強;;負壓波法在液體管道上的可檢測泄漏率分析[J];石油學報;2010年04期
，本文編號：2390406
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