CalculationTest and Degaussing Optimization of Magnetic Field in Diesel Engine

doi:10.3969/j.issn.1000-1093.2020.02.017

Abstract

Abstract: The magnetism and demagnetization of diesel engine of low magnetic ship are studied from the finite element simulation results of magnetic field of diesel engine. A finite element simulation model of a diesel engine is established by using the magnetic analysis COMSOL software, and the strength of induced magnetic field and its spatial distribution are calculated. The degaussing method is used to find the optimal degaussing parameters through the integrated simulation of the diesel engine and degaussing array. The results show that, on a plane at 9 m below the diesel engine, the magnetic flux density at the positive center is the largest, the magnetic field is elliptically distributed, and the calculated value of the magnetic field strength relative to the maximum distortion of the geomagnetic field is as high as 224.35 NT. The error between the measured result and the simulated result is less than 5%, within the allowable error range; the optimal degaussing parameters can be used to reduce the intensity distortion variable of magnetic field on the plane at 9 m below the diesel engine to 8.33 nT, about 95%. Key

Key words: dieselenginemagneticfield, equivalentmagneticchargetheory, finiteelementmethod, demagnetization

CLC Number:

ZHAO Jianhua， YING Yuchen， GUO Chengbao. CalculationTest and Degaussing Optimization of Magnetic Field in Diesel Engine[J]. Acta Armamentarii, 2020, 41(2): 350-355.

References

［1］刘大明. 船舶消磁理论与方法[M].北京:国防工业出版社,2011.
LIU D M. Theory and method of ship demagnetization[M]. Beijing: National Defense Industry Press ,2011.(in Chinese)
[2］ GAO J J, ZHU X L, ZHU W B. Accurate calculating method of marine three-component geomagnetic field in shipboard measurement［C］∥Proceedings of Chinese Automation Congress. Wuhan: Chinese Association of Automation,2015: 1504-1507.
[3］思帆. 保证航行安全的消磁柴油机[J]. 柴油机, 2013,35(6): 66-67.
SI F.Degaussing diesel engine to ensure navigation safety[J]. Diesel Engine,2013,35(6):66-67. (in Chinese)
[4］杜志瀛. 船用柴油机磁性测量及磁性补偿技术研究[J].船舶,1991(4):54-60.
DU Z Y.Research on magnetic measurement and magnetic compensation technology of marine diesel engine[J]. Ship & Boat, 1991(4):54-60. (in Chinese)
[5］姜智鹏,庄飚. 船用柴油机磁场仿真计算及验证[J]. 船舶工程，2005,27(6):68-71.
JIANG Z P,ZHUANG B. Simulation calculation and verification of magnetic field of marine diesel engine[J]. Ship Engineering, 2005,27(6):68-71. (in Chinese)
[6］刘胜道,肖昌汉,周国华，等. 低磁舰艇设备磁场简化建模方法研究[J]. 电工技术学报,2013,28(增刊2):176-179.
LIU S D,XIAO C H,ZHOU G H,et al.Simplified modeling method for ferromagnetic devices in the low magnetic ship[J]. Transactions of China Electrotechnical Society, 2013,28(S2):176-179.(in Chinese)
[7］郭成豹,周炜昶. 舰船消磁绕组磁特征数值计算与验证研究[J]. 兵工学报,2017,38(10):1988-1994.
GUO C B,ZHOU W C.Numerical simulation and verification of magnetic signatures of ship degaussing coils[J]. Acta Armamentarii, 2017,38(10):1988-1994.(in Chinese)
[8］郭成豹，刘大明．舰船磁特征磁矩量法的图形处理单元加速计算研究［J］．兵工学报，2014，35(10): 1638－1643．
GUO C B,LIU D M. GPU-accelerated magnetic moment method for magnetic signatures of ship ［J］. Acta Armamentarii，2014,35(10): 1638-1643.(in Chinese)
[9］ ROBERTS S,BOND A． Predicting the magnetic signature of steel hull ships through FE modeling［C］∥Undersea Defence Technology Exhibition．Liverpool，UK:ACC，2014．

[10］ BIRSAN M,TAN Ｒ. The effect of roll and pitch motion on ship magnetic signature［J］.Journal of Magnetics,2016,21(4):503-508.
[11］朱武兵,庄劲武,赵文春，等. 载体感应磁场的改进积分方程法[J]. 国防科技大学学报,2018,40(3):101-106.
ZHU W B,ZHUANG J W, ZHAO W C, et al. Modified integral equation method for carrier′s induced magnetic field solving[J]. Journal of National University of Defense Technology,2018,40(3): 101-106. (in Chinese)
[12］朱武兵,赵文春,庄劲武，等.非磁性船舶涡流磁场数值建模方法[J].哈尔滨工程大学学报,2019,40(1):112-117.
ZHU W B,ZHAO W C,ZHUANG J W,et al. Modelling method for the eddy-current magnetism of non-magnetic ship[J]. Journal of Harbin Engineering University,2019,40(1):112-117. (in Chinese)
[13］马西奎.电磁场积分方程法、积分微分方程法和边界元法[M].北京：科学出版社，2017.
MA X K.Electromagnetic field integral equation method, integral differential equation method and boundary element method[M]. Beijing: Science Press,2017.(in Chinese)
[14］谢德馨，杨仕友.工程电磁场数值分析与优化设计[M].北京：机械工业出版社，2017.
XIE D X,YANG S Y. Numerical analysis and optimization of engineering electromagnetic fields[M]. Beijing: China Machine Press,2017.(in Chinese)
[15］国防科学技术工业委员会．舰船低磁柴油机规范:GJB 1223—1991（XG1-2015）[S]．北京:中国人民解放军总装备部，2015.
Commission on Science，Technology，and Industry for National Defense. Specifications of low magnetic diesel engines for naval vessels: GJB 1223—1991（XG1-2015）[S]. Beijing: The General Equipment Department of PLA,2015.(in Chinese)

第41卷第2期
2020 年2月兵工学报ACTA
ARMAMENTARIIVol.41No.2Feb.2020

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