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Research on Projectile Velocity of Electromagnetic Launcher Based on Speed Measurement system

Research on Projectile Velocity of Electromagnetic Launcher ...

引用

International Conference on Electrical Machines and systems (ICEMS)

作者： Songcheng Li Junyong Lu Long Cheng Yiting Wu Bofeng Zhu Junwei Cui National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan China

ISBN: (纸本)9781728133997

In electromagnetic launching, the launching speed, as a key index of the system, is of great significance. In this paper, the method of B-dot magnetic probe array is used to measure the velocity of projectile in-bore. A non-contact measurement method of the velocity outside-bore of projectile based on high-speed video system and digital image post-processing technology is proposed. The velocity of projectile is measured experimentally and the velocity curve of projectile is obtained. From the measured results, in the electromagnetic launching processing, by using inert projectile, the velocity of the projectile enters the attenuation stage randomly after its ejection, and there is no acceleration stage like that of the traditional gun.

关键词： Projectiles Velocity measurement Cameras Distortion Probes Calibration

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Interior Ballistic Characteristics of Continuous Launch of Electromagnetic Rail Launcher

Interior Ballistic Characteristics of Continuous Launch of E...

引用

International Conference on Electrical Machines and systems (ICEMS)

作者： Peipei Du Junyong Lu Sai Tan Junhong Feng Feifei Yan Kai Li National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan China

ISBN: (纸本)9781728133997

Based on the characteristics of the actual electromagnetic rail launcher (EMRL), the defects of the traditional dynamic response model of EMRL are pointed out and an improved dynamic response model of the EMRL is proposed. The dynamic response characteristics and stop response characteristics of the EMRL improved model are studied. A fast and accurate numerical calculation method for three-dimensional transient electromagnetic (EM) force of EMRL and a step-down method for high-order partial differential control equation of the EMRL dynamic response are proposed. Furthermore, the interior ballistic simulation model (IBSM) of EM and structural coupling of EMRL is established through self-programming. This model is used to study the interior ballistic characteristics of the EMRL during the continuous launching process under the condition of sequential discharge. It is found that the first dynamic response of the EMRL will lead to a greater fluctuation in the second rail deformation. When the time interval between successive launches reaches 1.0 s, the deformation of the second launching rail will no longer be affected by the first launching dynamic response of EMRL.

关键词： Rails Force Mathematical model Dynamics Transient analysis Numerical models power system dynamics

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Modeling of electronic attenuator in adaptive interference cancellation systems

Modeling of electronic attenuator in adaptive interference c...

引用

IEEE International Symposium on Electromagnetic Compatibility (EMC-Beijing)

作者： Yang Li Fangmin He Jin Meng Yi Li Qing Wang National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan Chnia

In the design of adaptive interference cancellation systems (AICSs), the simulation model plays an important role. Particularly, accurate modeling of the response of electronic attenuator is crucial but is usually a difficult task since it relies on the exact fitting of the response of real PIN diodes. In this paper, the PIN diode response characteristics are firstly measured with exprienment. Then, the key parameters of the model are extracted by fitting the experiment data with the output of the model. The feasibility of this approach is examined with three levels of experiments and simulations, i.e., the response of the PIN diode and the electronic attenuator, as well as the performance of the AICS. The results show that our proposed method is feasible and effective.

关键词： PIN photodiodes Attenuators integrated circuit modeling Voltage control Resistance Adaptation models Fitting

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Controller Area Network Modeling and Its Application in Cyber-Physical power system Co-Simulation

Controller Area Network Modeling and Its Application in Cybe...

引用

Chinese Control Conference

作者： You Wu Lijun Fu Yinan Xu Fan Ma Yao Lu National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan China

As a mainstream communication bus, the controller area network (CAN) is widely applied in automobiles, ships, trains and power systems. In this paper, based on the application of CAN in power system control, a simulation model of CAN bus is built in network simulator OPNET, including the corresponding node model, process model, packet model and link model. The effectiveness of the model is validated through simulations. A cyber-physical power system co-simulation platform based on OPNET and PSCAD is also proposed in this paper. The interfaces between the two simulators and the time synchronization method of the co-simulation platform are designed. And the CAN model is modified with OPNET ESYS module to be integrated in the co-simulation.

关键词： power systems Data models Mathematical model Analytical models Monitoring power system control Communication networks

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Research on the Control Strategy Based on Peak-Prediction for the Pulse power supply

Research on the Control Strategy Based on Peak-Prediction fo...

引用

International Conference on Electrical Machines and systems (ICEMS)

作者： Xiao Zhang Junyong Lu Yufeng Dai Wenxuan Wu Xin Wang Tao Ma National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval Universigy of Engineering Wuhan China

ISBN: (纸本)9781728133997

The capacitive Pulse power supply is widely utilized in the electromagnetic launch system. And the ideal launcher current is in the square-shape. To solve the problem of the precise current control of the supply, a new control strategy is proposed based on the prediction of the peaks of the output current. First, the mathematical model is built for the system composed of the capacitive Pulse power supply and the rail-type electromagnetic launcher. Then the time sequential control strategy is proposed. And the effectiveness of the proposed method is validated by simulation. Based on the proposed strategy, the local peaks of the output current and the peaks of the acceleration can be precisely controlled as required, which is essential for the design of the guided projectile.

关键词： Projectiles power supplies Rails Electromagnetics Mathematical model Acceleration

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All-solid-state High-voltage Marx Pulse Generator Based on Magnetic Isolated Drive Circuit

All-solid-state High-voltage Marx Pulse Generator Based on M...

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IEEE International Symposium on power Electronics for Distributed Generation systems (PEDG)

作者： Qingqing Liu Ruitian Wang Xin Li National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan China

An all-solid-state high-voltage pulse generator based on the bipolar Marx circuit is presented in this paper. A drive circuit of the silicon carbide (SiC) MOSFETs based on the magnetic core transforms is used to transmit the drive signals, in order to get the magnetic isolation of the drive circuit to the main Marx circuit and improve the consistency of the devices’ operation. First, the topology and operating principles of the generator are described, and main components of the generator are designed. Then, the detailed circuit of the magnetic isolated drive is presented and operational principles are analyzed. Finally, experiments are carried out and the test results show that the developed bipolar Marx pulse generator can output the polarity adjustable pulse with the amplitude of ±5kV, and rising edge of 26ns and falling edge of 96ns.

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Low Frequency Oscillation Analysis of VSG Grid-Connected system

Low Frequency Oscillation Analysis of VSG Grid-Connected Sys...

引用

IEEE Asia power and Energy Engineering Conference (APEEC)

作者： Guangyu Wang Lijun Fu Qi Hu Fan Ma Chenruiyang Liu Yunfeng Lin National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan China

ISBN: (纸本)9781665425513;9781665430791

Due to that VSG (virtual synchronous generator) simulates the operation characteristics of SG (synchronous generator), similar stability issue that is common in traditional power system may also exist in VSG grid-connected system. In this paper, the low frequency oscillation of VSG is studied, with the influence of reactive power control and dq-axis voltage control considered especially. Firstly, a small signal model of VSG with voltage/current double closed loop control and active/reactive power control is developed. Based on the model, the low frequency oscillation of VSG is explored. It is identified that the low frequency oscillation mode is dominated by virtual rotor motion, which is similar as that in SG. Further, participation factor analysis and parameter sensitivity analysis reveal that the reactive power loop and dq-axis voltage control have much influence on the damping of the low frequency oscillation. Finally, simulated results are presented to verify the analytical results.

关键词： Damping Reactive power Sensitivity analysis Rotors power system stability Synchronous generators Stability analysis

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Performance Comparison of Real and Complex Valued Neural Networks for Digital Self-Interference Cancellation

Performance Comparison of Real and Complex Valued Neural Net...

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International Conference on Communication technology (ICCT)

作者： Qing Wang Fangmin He Jin Meng National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan China

Digital Self-Interference Cancellation (SIC) is the key technique for enabling In-Band Full-Duplexing (IBFD). Commonly, a nonlinear model is required to approximate the circuity nonlinearity so as to achieve SIC. Artificial neural network (ANN) is a potential candidate due to its nature of nonlinear approximation. Although real-valued neural network (RVNN) is more widely used in the field of artificial intelligence, the counterpart, complex-valued neural network (CVNN) seems to be more appropriate for digital SIC since the communication baseband signals are essentially complex. With this hypothesis, we conduct comprehensive comparisons of RVNN and CVNN for digital SIC in this paper. It is interesting to find that CVNN does perform better but only when non-holomorphic activation functions are used, and the number of hidden layer neurons can be reduced by maximally a half. When the number of neurons is larger than a certain value, RVNN and CVNN both achieve their optimal performance and provide approximately the same cancellation result.

关键词： Baseband Interference cancellation Biological neural networks Neurons Approximation algorithms Signal processing algorithms

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Dynamic modeling of the circular winding brushless DC (CWBLDC) machine

Dynamic modeling of the circular winding brushless DC (CWBLD...

引用

International Conference on power Electronics and Motion Control (IPEMC)

作者： Siwei Cheng Qinghu Zhang Zhewu Jia Huangda Lin Dong Wang National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan China

ISBN: (纸本)9781509012114

A circular winding brushless DC (CWBLDC) motor is essentially a trapezoidal-EMF multiphase permanent magnet machine with the associated commutation circuit. It can achieve the same level of torque ripple performance as PMSMs, yet boast much higher torque density since the iron core is more fully utilized with trapezoidal EMFs. Field-circuit co-simulation is an effective and accurate tool in studying the operating principle of CWBLDC motors. However, it is too time-consuming. This paper thus proposes a dynamic model for the CWBLDC motor. A 10 kW, 8-pole, 46-slot, and 23-phase CWBLDC motor and associated commutation circuit has been modeled in the PLECS simulation environment. The simulation results agrees very well with field-circuit co-simulation and experimental tests, which verifies the precision of the proposed model.

关键词： Permanent magnet motors Windings Brushless motors integrated circuit modeling Mathematical model Commutation Inductance

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Real-time Simulation of Grounding Fault Protection Method Used for Medium-voltage DC power system Based on RT-LAB

Real-time Simulation of Grounding Fault Protection Method Us...

引用

Chinese Control Conference (CCC)

作者： Xuexin Fan Penghui Guo Fan Ma Ruitian Wang Guorun Yang National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan China

The Grounding fault location and protection is a key technology for the DC power system and is important to the normal operation of the power system and the safety of operators. The grounding fault location protection method based on additional grounding resistance is introduced in this paper, and its controller is made. It takes high risk and cost to directly test the controller directly in the DC power system. Therefore, a hardware in loop (HIL) real-time simulation system is established on the real-time simulation platform RT-LAB to verify the function of the controller. The real-time simulation results are compared with those obtained from MATLAB/ simulink off-line simulation, which shows that the grounding fault location and protection method is feasible and effective, and that the controller has successfully implemented its function.

关键词： Grounding integrated circuit modeling Circuit faults Real-time systems Mathematical model Computational modeling

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