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A capture probability analytic model for the electromagnetic launched anti-torpedo torpedo

Defence technology（防务技术） 2022年第2期18卷 261-270页

作者： Bao-qi Wu Xiao-cun Guan Shao-hua Guan Jing-bin Shi National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of EngineeringWuhan430033China Jiangsu Automation Research Institute Lianyungang 222006China

With the unique characteristics,electromagnetic launch technology is applicable to launch shipborne anti-torpedo torpedo(ATT).This paper aims to establish an analytic model to pre-evaluate the capture probability of the electromagnetic launched *** mathematics model of the multi-stage coilgun and the trajectory of the ATT is established for *** influence factors of the capture probability are analyzed respectively,including the entry point dispersion of the ATT and the position dispersion of the incoming *** the advanced angle interception mode,the ATT search model is obtained according to the positional relationship,and the course error is synthetically calculated according to the differentiation of implicit function.A geometric method to calculate the integral boundaries of the probability density function is proposed,based on the relative motion of the ATT and the incoming *** verify the proposed integral model,the digital simulation and comparison is *** results reveal that the variation trends and the calculation value of the proposed analytic model are coincident with the statistic results from Monte Carlo *** implications of the results regarding the analytic model are discussed.

关键词： Electromagnetic launch Anti-torpedo torpedo Analytic model Dispersion variance Integral boundary

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Research on current decoupling control of six-phase permanent magnet linear synchronous motor for electromagnetic launch

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International Journal of Mechanical system Dynamics 2021年第2期1卷 267-277页

作者： Xingfa Sun Jin Xu Junjie Zhu Department of Electrical Engineering National Key Laboratory of Science and Technology on Vessel Integrated Power SystemNaval University of EngineeringWuhanChina

Six-phase permanent magnet linear synchronous motor(PMLSM)for electromagnetic launch(EML)system presents the characteristics of a high order,nonlinearity,multivariable,strong coupling,and nonperiodic transient operation in the synchronous rotating coordinate system,posing a great challenge to the dynamic response ability of the current *** research on current decoupling control(CDC)mainly focuses on cross decoupling within a three-phase system,even though there are neither decoupling methods for multiphase systems nor effective evaluation criteria for the decoupling and dynamic response *** this perspective,this paper first presents an equivalent reduced-order complex-matrix dynamic mathematical model of six-phase PMLSM and analyze its transient coupling characteristics during the process of ***,the CDC methods of six-phase PMLSM based on direct compensation and matrix diagonalization principles are realized,respectively,to accomplish the cross decoupling and back electromotive force decoupling within and between different three-phase ***,an all-round method is proposed,for the first time,to evaluate the decoupling performances and dynamic response performances of different CDC strategies for six-phase *** superiority of deviation decoupling regulator in decoupling performance and robustness are verified based on high-speed EML experimental platform of six-phase PMLSM.

关键词： complex-matrix mathematical model current decoupling control electromagnetic launch strong transient

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Modeling of Electronic Attenuator in Adaptive Interference Cancellation systems 5

Modeling of Electronic Attenuator in Adaptive Interference C...

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The 5th International Symposium on Electromagnetic Compatibility

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

ISBN: (纸本)9781509051861;9781509051854

In the design of adaptive interference cancellation systems(AICSs),the simulation model plays an important ***,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 *** this paper,the PIN diode response characteristics are firstly measured with ***,the key parameters of the model are extracted by fitting the experiment data with the output of 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 *** results show that our proposed method is feasible and effective.

关键词： PIN diode electronic attenuator modeling interference cancellation

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Control Strategy for Inverter Parallel and Parallel with Synchronous Generator Based on Virtual Synchronous Generator Theory 36

Control Strategy for Inverter Parallel and Parallel with Syn...

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第36届中国控制会议

作者： Kewen Lin Fei Xiao Guisheng Jie Changwu Hou Ruitian Wang National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering

ISBN: (纸本)9781538629185

With the development of electrical control technology and the need of environmental protection,the marine shaft generating system based on PWM technology is developed and *** shaft generator system,inverters parallel and parallel of inverter and diesel generator are key ***,the paper proposes a control strategy based on virtual synchronous generator theory that simulates the large inertia and the output impedance characteristics of the synchronous generator to solve these *** this paper,the mathematical model of the inverter and the overall control block diagram of the inverter are introduced and the control model of the virtual synchronous generator is *** Simulation using Matlab and real-time simulation system of the parallel operation of inverters and parallel operation of inverter and diesel generator are carried *** simulation results show that the control strategy is feasible.

关键词： marine power system inverter double-loop control virtual synchronous generator real-time simulation

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Post-arc transient characteristics for dc vacuum circuit breaker with diode connected in series 4

Post-arc transient characteristics for dc vacuum circuit bre...

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4th IEEE Conference on Energy Internet and Energy system Integration, EI2 2020

作者： Peng, Zhendong Li, Bo Sha, Xinle Yang, Chenguang Ren, Zhigang Wuhan Institute of Marine Electric Propulsion Ship Integrated Power System Technology Key Laboratory Wuhan China

ISBN: (纸本)9781728196060

Experimental investigations have been carried out on the rapid high current commutation interruption (CI) process of a 10kV DC vacuum circuit breaker (VCB). The VCB arc restriking and breaking failure phenomenon appeared frequently in 23kA CI tests with arc current fall rate of about 300Aμs for a single VCB, while the VCB CI reliability has been improved a lot under the same conditions with diode connected in series. After a detailed analysis of the vacuum gap (VG) post-arc transient characteristics, it was found that it lasted about 450 μs before the VG finishing the ion sheath development for the single VCB in the post-arc stage. Meanwhile, the VG electric field intensity (EFI) and power density (PD) would quickly rise to the peak values of 12MV/m and 45MW/m2 separately in about 1μs after the arc zero-crossing. As a result, the VG electrical or thermal breakdown were very prone to come out when the plasma concentration was still high in the sheath development stage. With the diode in series, the VG power injection path was cut off effectively by the diode reverse blocking, the initial transient recovery voltage rising very fast would be avoid and the plasma concentration was promoted to decay significantly, by which both the EFI and PD were decreased greatly when the VG began to get insulation recovery in the post-arc phase. Under the most extreme condition that the VG started to build dielectric strength at the end of the diode reverse blocking, the simulation results revealed the EFI and PD peak values were substantially reduced to 130kV/m and 1.4kW/m2 respectively and delayed for about 30μs, which were very beneficial to reduce the VG breakdown probability and improve the dielectric recovery performance in the post-arc transient. © 2020 IEEE.

关键词： Diodes

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A Forced Commutation Breaking Method of Dc Circuit Breaker Taking Account of Load Current Occasions

A Forced Commutation Breaking Method of Dc Circuit Breaker T...

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2021 International Conference on Applied Mathematics, Modeling and Computer Simulation, AMMCS 2021

作者： Li, Bo Peng, Zhendong Xie, Pengfei Ren, Zhigang Ship Integrated Power System Technology Key Laboratory Wuhan Institute of Marine Electric Propulsion Wuhan China

ISBN: (纸本)9781643682549

In the DC power system, the circuit breaker must not only complete the rapid disconnection and isolation of the high short-circuit fault current, but also undertake the frequent switching tasks of the small load rated current. First of all, this research adopts the topological structure of double-breaker series connection and introduction of auxiliary oscillating branch on the basis of forced *** control strategies can be adopted according to different current levels, which can realize the rapid breaking of small currents while improving high current breaking ***, through the mathematical analysis of the working process of the circuit structure, and based on the PSCAD/EMTDC electromagnetic transient simulation software, the influence of different branch parameters on the breaking process is analyzed, and the circuit parameter optimization design is carried out for the breaking process of different load current levels. © 2022 The authors and IOS Press.

关键词： Electric circuit breakers

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IGBT Failure mechanism and boundary analysis under large current and high temperature turn-off 3

IGBT Failure mechanism and boundary analysis under large cur...

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2020 3rd International Symposium on power Electronics and Control Engineering, ISPECE 2020

作者： Ma, Xiao Huang, Yongle Luo, Yifei National Key Laboratory of Science and Technology on Vessel Integrated Power System China

Considering overload working conditions in electromagnetic emission, the paper presents a simulation of IGBT turn-off under large current and high temperature. Numerous simulation result is received under a specific test circuit. Boundary conditions for temperature, current and starry inductance are obtained under a set of temperature criterion. Further analysis proves that after temperature reaches the criterion, high current density path swiftly extends from local area to a vertical current path throughout the cells. This method for IGBT theoretical boundary is useful for similar projects or working conditions. © Published under licence by IOP Publishing Ltd.

关键词： Insulated gate bipolar transistors (IGBT)

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Digital and analog hybrid control in adaptive interference cancellation system

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The Journal of China Universities of Posts and Telecommunications 2010年第6期17卷 1-10页

作者： JIANG Yun-hao ZHAO Zhi-hua TANG Jian LI Wen-lu XIAO Huan College of Electrical and Electronic Engineering Huazhong Utliversity of Science and Technology Wuhan 430074 China National Key Laboratory for Vessel Integrated Power System Technology Naval University of Engineering Wuhan 430033 China

The digital proportion control is introduced to improve the performance of the analog adaptive interference cancellation system （ICS）. For the high frequency parts of the signals after multiplier are not required,the sampling frequency need not satisfy the sampling theorem for high frequency. Because the sampling,calculation and output expend time in digital control,the ideal condition,delay condition and delay-wait condition are taken into account. Through analyzing the system model with three conditions,we gain the stable conditions of the system,the optimization step factors that can make the system converge fastest and the formulas of the interference cancellation ratios （ICRs）. One step convergence can be accomplished under ideal condition,whereas the system can not converge in one step under delay condition and delay-wait condition. The calculation results show the convergence speed of delay-wait condition is slower than that of delay condition. The ICR is improved with the increase of the step factor which is in stable bound,but the convergence speed is decreased if the step factor exceeds the optimization step factor. In order to avoid that confine,the method of amending the steady state weight to improve the ICR is proposed. The analyses are in agreement with the computer simulations.

关键词： digital and analog hybrid control adaptive interference cancellation weight ICR convergence speed

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Self-Tuning Control of Large-Capacity Friction Brake Based on RBF Neural Network 2

Self-Tuning Control of Large-Capacity Friction Brake Based o...

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2017 IEEE 2nd Information technology, Networking, Electronic and Automation Control Conference (ITNEC 2017)

作者： LI Pengfei WANG Guangsen LIU Yong OUYANG Bin ZHANG Xiangming National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval Univ.of Engineering

ISBN: (纸本)9781509064151;9781509064144

A large-capacity friction brake has been analyzed in this paper. The nonlinear model has been given and its working principle has been described quite clear. In order to realize the precise control of the large-capacity friction brake, a PID control method based on Kalman filter and the dynamic identification of radial basis function neural network is *** extended Kalman filter algorithm can reconstruct the feedback signal of the whole frequency interference, which can be used for neural network identification and PID control *** algorithm can handle hostile work environment, and its antiinterference is good. The training time of the radial basis function network algorithm is less than the back-propagation algorithm's. In short, using this algorithm, it is easy to realize online identification, what's more, it is easier to approach the local characteristics of the controlled object, and the identified model is more precise. Compared with traditional control methods, the control method proposed in this paper can deal with the non-linear and slow time-varying characteristics, and it has been verified through the prototype test, which has the guiding significance for the precise control of the large-capacity friction brake.

关键词： friction brake radial basis function extend Kalman filter self-tuning system identification

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Optimal Design of a High-power Friction Brake Based on Improved Genetic Algorithm 36

Optimal Design of a High-power Friction Brake Based on Impro...

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第36届中国控制会议

作者： LI Pengfei WANG Guangsen ZHANG Xiangming MA Mingzhong National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval Univ. of Engineering

ISBN: (纸本)9781538629185

For the emergency braking of a large-capacity inertia flywheel energy storage system, this paper refers to a rapid braking scheme based on the friction brake. However, its difficulty lies in the design of a high power brake, which includes temperature, volume, power and so on. The present multi-objective optimization algorithm is not available for engineers due to its complicated design, much difficulty in implementation, and time-consuming calculation. Therefore, this paper has proposed an improved genetic algorithm to solve multiple constraints, which can be changed into a problem of common constraint. Moreover the algorithm is convenient for designers because of its ideal convergence, universality and flexibility. The prototype testing proves the braking scheme of the large-capacity flywheel energy storage system to be feasible and the optimized algorithm for the friction brake to be effective, which can play a certain guiding role in engineering practice.

关键词： friction brake genetic algorithm multi-objective optimization penalty function

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