国防科技大学学报
國防科技大學學報
국방과기대학학보
JOURNAL OF NATIONAL UNIVERSITY OF DEFENSE TECHNOLOGY
2014年
1期
98-103
,共6页
轴频电场%三层媒质%赫兹矢量势%时谐电偶极子%直流电偶极子
軸頻電場%三層媒質%赫玆矢量勢%時諧電偶極子%直流電偶極子
축빈전장%삼층매질%혁자시량세%시해전우겁자%직류전우겁자
shaft-ELFE%three layer medium%Hertz vector%time-harmonic dipole%DC dipole
为了对浅海环境中的船舶轴频电场进行建模，以基本模拟单元---水平时谐电偶极子为例，根据惟一性原理结合边界条件求解赫兹矢量势。通过电磁场与赫兹矢量势的关系式，推导了其在浅海环境下在海水中产生的电磁场的计算公式。对水平直流电偶极子在三层介质下的电磁场分布进行了求解，对其在海水中产生电场的空间分布特性及通过特性进行了分析。在实验室中模拟浅海海洋环境和水平时谐电偶极子，将水平时谐电偶极子和直流电偶极子在轴频段的电场分布仿真结果与实际测量结果做对比。结果表明，时谐电偶极子实际电场分布与理论计算结果一致，证明了推导过程和所得解析表达式的正确性；水平直流电偶极子在对轴频电场的信号包络中进行求解时建模精度高，可替代水平时谐电偶极子的计算模型，且具有更高的工程实用性。
為瞭對淺海環境中的船舶軸頻電場進行建模，以基本模擬單元---水平時諧電偶極子為例，根據惟一性原理結閤邊界條件求解赫玆矢量勢。通過電磁場與赫玆矢量勢的關繫式，推導瞭其在淺海環境下在海水中產生的電磁場的計算公式。對水平直流電偶極子在三層介質下的電磁場分佈進行瞭求解，對其在海水中產生電場的空間分佈特性及通過特性進行瞭分析。在實驗室中模擬淺海海洋環境和水平時諧電偶極子，將水平時諧電偶極子和直流電偶極子在軸頻段的電場分佈倣真結果與實際測量結果做對比。結果錶明，時諧電偶極子實際電場分佈與理論計算結果一緻，證明瞭推導過程和所得解析錶達式的正確性；水平直流電偶極子在對軸頻電場的信號包絡中進行求解時建模精度高，可替代水平時諧電偶極子的計算模型，且具有更高的工程實用性。
위료대천해배경중적선박축빈전장진행건모，이기본모의단원---수평시해전우겁자위례，근거유일성원리결합변계조건구해혁자시량세。통과전자장여혁자시량세적관계식，추도료기재천해배경하재해수중산생적전자장적계산공식。대수평직류전우겁자재삼층개질하적전자장분포진행료구해，대기재해수중산생전장적공간분포특성급통과특성진행료분석。재실험실중모의천해해양배경화수평시해전우겁자，장수평시해전우겁자화직류전우겁자재축빈단적전장분포방진결과여실제측량결과주대비。결과표명，시해전우겁자실제전장분포여이론계산결과일치，증명료추도과정화소득해석표체식적정학성；수평직류전우겁자재대축빈전장적신호포락중진행구해시건모정도고，가체대수평시해전우겁자적계산모형，차구유경고적공정실용성。
In order to ship model the Shaft-ELFE in shallow sea,the basic simulation unit-time-harmonic horizontal electric dipole was taken for example,the Hertz vector potential was solved based on the uniqueness principle combined with boundary conditions.The electromagnetic field in shallow seawater was derived from the relational expression between Hertz vector potential and electromagnetic field.The electromagnetic field distribution of DC dipole in three media was solved.The simulated results show that the horizontal electric cell can be used to compute the harmonic cell at sufficiently low frequencies between 1 Hz and 7Hz.The conclusion was further confirmed in laboratory,utilizing the horizontal electric cell and the horizontal harmonic electric cell source in man-made seawater.Finally,the shallow marine environment and horizontal time-harmonic electric dipole were simulated in the laboratory,the electric field distributions of time-harmonic electric dipole and DC dipole were compared.The results show that the time-harmonic electric dipole electric field distribution was consistent with the theoretical calculation,which proved that the derivation and analytical expression are correct;the horizontal time-harmonic current model can be replaced by horizontal DC dipole when the envelop of shaft-ELFE is simulated,and has a higher accuracy and practicability.
