Demagnetization Process Analysis and Numerical Simulation of Magnet with Shock Wave from Compact Explosively Driven Ferromagnetic Generator

3rd International Conference on Automation, Control and Robotics Engineering

工业技术;计算机科学;无线电电子学

Wei, Jian^1 ; Ma, Shaojie^1 ; Liu, Peng^1 ; Shi, Yunlei^2

Ministerial Key Laboratory of ZNDY, Nanjing University of Science and Technology, Nanjing, China^1

Quality Inspection and Testing Cneter, China Electronic Product Reliability and Environmental Testing Research Institute, Guangzhou, China^2

关键词: Cylindrical magnets;    Demagnetization process;    Demagnetization rates;    Impulse sources;    Magnetic flux compression generators;    Nd-Fe-B magnets;    Nonlinear finite element method;    Propagation rule;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/428/1/012014/pdf
DOI  :  10.1088/1757-899X/428/1/012014

来源: IOP

【 摘 要 】

For compact explosively driven ferromagnetic impulse source used in magnetic flux compression generators, the relations between the magnet's demagnetization rate and the shock wave pressure are theoretically analyzed. A nonlinear finite element method is adopted to conduct numerical simulation on the magnet's impact loading process. The propagation rules and pressure distributions of shock wave within hollow cylindrical NdFeB magnet caused by lateral impact of single-ended and double-ended initiating explosives are explored. The numerical simulation results show that, the pressures at both ends resulting from lateral impact of double-ended initiating explosives on hollow cylindrical magnet are low; double-ended initiating has faster demagnetization rate, swifter variation of flux and higher electromotive force of inductive output than single-ended initiating.