Magnetorheological Fuze Extended Arming Time Self-adjusting Technology

Magnetorheological fluid (MRF) is a new kind of smart materials. Under the high magnetic field, MRF can be transformed from Newton fluid into Visco-plastic solid instantaneously, and MRFs viscosity and yield stress will be changed with the magnetic field intensity The transformation requires little power, short time and the change process can be controlled. MRF is a promising medium in fuze delay arming device for its better characteristic.The paper detailed discusses the characteristics and the latest research results of the MR Technology and the fuze delay arming device. A new kind of fuze delay arming device is designed according to the especial characteristic of the MRF,the fuze design manual. Theoretical analysis, numerical simulation and test verification are used to investigate the followings:1) Based on the MRF fluid dynamics theory, the delay arming time model of the MRF fuze is set up. Then the time the MRF effuses from the MRF device of fuze is given. Ansys software is used for numerical simulation to the MRF flow field;2) The magnetic circuit design is finished by magnetic conductivity method, and then the Ansoft software is used for numerical simulation to validate fuze safety in peacetime and trustiness in working;3) According to the voltage,the power which the coil magnetic circuit needs and the tactical and technical requirements of the fuze power, a special power of fuze is designed;4) The connection between the current, the discharge aperture - the time of discharge was gotten by experiment. At the same time, the results of the experiment showed that: the effect is obvious cun'ent in the coil discharge time of the regulating role, and the time of the delay arming device is according with the requirements of the design.Finally, the work of this dissertation was concluded. The innovations and contributions of this work were introduced. And also, the potential issues of this research were pointed out.