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检索条件"机构=Dept.of Logistic Command and Engineering Naval Univ.of Engineering"

共 16 条记录，以下是1-10 订阅

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A Novel Vector Control of Five-phase PMSM Based on Harmonic Current Closed Loop 2

A Novel Vector Control of Five-phase PMSM Based on Harmonic ...

引用

2018 2nd International Conference on Electronic Information Technology and Computer engineering (EITCE 2018)

作者： Yu Fei Zhou Yongchao Dept.of Electrical Eng. Naval Univ.of Engineering

Multi-phase electric machines such as five-phase permanent magnet synchronous motor(PMSM) play an important role in the ships electrical propulsion because of the advantages of high performance and high reliability. The decoupled mathematic models of five-phase PMSM in dq coordinate frame are established, and the reason caused to high stator harmonic current in the multi-phase motor is analyzed based on the mathematic models. To suppress the harmonic current, a novel vector control(VC) method based on SVPWM and harmonic current closed loop control is proposed. Based on the proposed algorithm, a five-phase PMSM vector control system is established with MATLAB, the performance is simulated and analyzed. The results show that, the stator harmonic current is much little than that of the traditional control method.

关键词： SVPWM Vector A Novel Vector Control of Five-phase PMSM Based on Harmonic Current Closed Loop

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Predicting Residual Life Model Based on Bayesian

Predicting Residual Life Model Based on Bayesian

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第30届中国控制与决策会议

作者： Liu Gang Li Fang Hu Bin Dept.of Management Engineering Naval Univ.of Engineering

To deal with the growing complexity of weapon equipment and the increasing tediousness of its maintenance, the Bayesian model was applied to predict residual life of equipment after repair, which provides the basis for reasonably arranging its repair plan. Replacing the traditional exponential distribution, Weibull distribution was used for describing life characteristic of system. Furthermore, the methods of maximum likelihood and Bayesian were utilized to estimate two parameters of Weibull distribution, and the confidence intervals were given. On the basis, according to two situations that prior sample and posterior sample, the residual life after repair was predicted by Bayesian model respectively. The illustrative example was given in paper, and the proposed method was proved to be effective.

关键词： Weibull distribution Bayesian residual life predict

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Multi-state System Reliability Analysis Combined PH Distribution with universal Generating Function 29

Multi-state System Reliability Analysis Combined PH Distribu...

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第29届中国控制与决策会议

作者： Peng DI Tong CHEN Luan WAN Dept.of Management Engineering Naval Univ.of Engineering Office of Research & Development Naval Univ.of Engineering

ISBN: (纸本)9781509046584

To make multi-state system reliability model reveal the randomness of component or system state changes more authentically,reduce the number of system states effectively and simplify the solution of model,this paper employs continuous phase type(PH) distribution to improve universal generating *** is firstly assumed that a multi-state component's residence time in different states is subject to general distribution,which is presented in the PH distribution.A procedure for solving Instantaneous probability of each state is provided to construct the improved universal generating function for multi-state ***,this paper describes how to construct the improved universal generating function for serial,parallel and complex systems,and obtains the reliability measures,such as the system instantaneous availability,average performance and mean performance deficiency ***,an example is used to verify the improvements of the model descriptive and state dimension control capability,and the algorithm effectiveness is illustrated demonstrated simultaneously.

关键词： Multi-state System Reliability Continuous Phase-type Distribution universal Generating Function

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Research on Dynamic Robustness Model Based on Random-walk Betweenness 29

Research on Dynamic Robustness Model Based on Random-walk Be...

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第29届中国控制与决策会议

作者： Hu Bin Xu Yi-fan Liu Gang Dept.of Management Engineering Naval Univ.of Engineering Lab of Vessel Integrated Logistics Support Naval Univ.of Engineering

ISBN: (纸本)9781509046584

By introducing random-walk betweenness(RB) into dynamic robustness model,a dynamic robustness model based on RB is proposed,which is more realistic than the dynamic robustness model based on *** order to study characteristics of the model,we compare the model with dynamic robustness model based on betweenness in scale-free network by *** find that node betweenness of dynamic robustness model based on RB is smaller and difference among different nodes is smaller;Dynamic robustness of dynamic robustness model based on RB is related with degree distribution of scale-free *** degree distribution of scale-free network is uniform,dynamic robustness of the model is larger.

关键词： complex networks dynamic robustness model random-walk betweenness scale-free network

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The Integrated Allocation of Weapon System’s Operational Readiness Indicators Based on FEGA 29

The Integrated Allocation of Weapon System’s Operational Re...

引用

第29届中国控制与决策会议

作者： XIE Zongren MA Quli XU Yifan WANG Guangqiang Dept.of Management Science Naval Univ.of Engineering

ISBN: (纸本)9781509046584

Due to the shortage of the relationship among the indicators of the system-subsystem-device level of weapon system,and the numerous following impact,operational readiness indicators transferring and spreading relationships among three levels are *** integrated allocation model of readiness indicators which can meet all the requirements,enable to lower technical and economic cost,and has all-level consistent indicators is *** to the multivariate optimization characteristics of the model,an optimized solution of the genetic algorithm based on float-encoding（FEGA） is selected.A MATLAB program is generated and a typical example with its optimized calculation is *** considering the actual situation in the operation and maintenance of weapon system,the technical and economic feasibility along with cost-effectiveness and other factors,trading-off analyses on the calculation results are *** upper results have realized the multi-level（system-subsystem-device level） coordination and integration of the weapon system,and lay a convictive foundation for the design,development and certification test of weapon system.

关键词： weapon system operational readiness subsystem and device integrated allocation optimization model float-encoding genetic algorithm

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A New Testability Allocation Method Based on Improved AHP

A New Testability Allocation Method Based on Improved AHP

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第29届中国控制与决策会议

作者： Liu Gang Lü Jianwei Hu Bin Dept.of Management Engineering Naval Univ.of Engineering

ISBN: (纸本)9781509046577

Testability allocation is one important job of testability design,for allocating relevant indexes to the lower levels of *** traditional AHP is influenced by subjective factors,which make the final evaluation results unreasonable,and too far out of the actual *** the traditional AHP is optimized to make the results of testability allocation more reasonable and close to life,scale was improved,judgment matrix was modified,and expert eliminating strategy was introduced,and error caused by subjective reason was decreased and avoided,consequently testability optimization allocation method based on improved AHP was *** results show that this method is reasonable and corresponded to engineering practice.

关键词： Testability Allocation Improved AHP

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Design of adaptive filter amplifier in UV communication based on DSP

Design of adaptive filter amplifier in UV communication base...

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International Symposium on Optoelectronic Technology and Application 2016(OTA 2016)——Conf.15 Optical Communication and Optical Network

作者： LV Zhaoshun WU Hanping LI Junyu Naval Univ.of Engineering Dept.of Ordnance Engineering Wuhan Institute of Technology Institute of Optoelectronic System Technology Xiangtan University Faculty of Physics and Optical Engineering

According to the problem of the weak signal at receiving end in UV communication, we design a high gain, continuously adjustable adaptive filter amplifier. Based on proposing overall technical indicat

ISBN: (数字)9781510607750

ISBN: (纸本)9781510607743

关键词： near ground UV communication amplifier adaptive filter DSP adaptive filters Digital signal processing Desmoplakin Gene Amplifiers signal amplifier receiving end operating principles technical support

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Compressed Sensing to Power Quality Signal with Orthogonal Matching Pursuit Method

Compressed Sensing to Power Quality Signal with Orthogonal M...

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2016 4th International Conference on Machinery,Materials and Information Technology Applications(ICMMITA 2016)

作者： OUYANG Hua YANG Zhonglin LI Hui Dept.of Electrical Eng.Naval Univ.of Engineering

Compressed sensing is a new data compression method which can recover a sparse or compressible signal from a small number of linear and non-adaptive measurements. To solve the problems of high sampling rate and massive data storage faced by traditional collection and compression methods of power quality, compressed sensing algorithm is used in the paper. Gaussian random measurement matrix is used to complete the compressed sampling. The orthogonal matching pursuit method is adopted in the reconstruction processes. Simulation show that The SNR of the reconstruction of harmonics signal using compressed sensing is higher than the traditional compression method such as wavelet transform and DCT transform.

关键词： Compressed sensing Power quality Sparse representation Orthogonal matching pursuit

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Modeling and Simulation on Complex System Life Cycle Risk Dynamic Evolution

Modeling and Simulation on Complex System Life Cycle Risk Dy...

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2015 International Conference on Modeling, Simulation and Applied Mathematics（MSAM 2015）

作者： Yifan Xu Jianwei Lv Peng Di Zongren Xie Dept.of Management Engineering Naval Univ.of Engineering

ISBN: (纸本)9781510811980

Complex system life cycle management is system engineering involving high technology,high investment and high *** paper studied risk evolution and risk level distributions on different stages during complex system life *** into account risk propagation and feedback influence,the risk evolution of complex system life cycle was modeled based on system *** risk levels distributed on all stages of system life cycle were simulated by system dynamic *** simulation results are helpful to understand that the initial stages of life cycle are more flexible and valuable to change for risk ***,sensitivity analysis illuminates that different system types of risk have different risk distributions among stages of life cycle and hereby different emphasis of risk management during life cycle should be considered according to different system types of risk.

关键词： complex system system life cycle risk evolution system dynamics modeling and simulation

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Modeling and Application of Ship Operational Readiness Indicator System

Modeling and Application of Ship Operational Readiness Indic...

引用

2nd International Conference on Simulation and Modeling Methodologies,Technologies and Applications(SMTA 2015)

作者： Jianwei Lv Zongren Xie Yifan Xu Dept.of Management Science Naval Univ.of Engineering

Through analyzing the operational readiness indicators of domestic and overseas naval ships, it is pointed out that there is actually a system for these indicators even though they are simple on the surface, which covers much information on the application tradition, practice and data of naval ships around the world. On this basis, this paper analyzes the life cycle of ship and puts forward a naval ship operational readiness indicator system containing 4 series and 10 indicators. By presenting the calculation results of typical ship operational readiness indicators, this paper also analyzes the hierarchical transmission relations among ship operational readiness indicators. The study on the general reliability and maintainability of ship based on modeling and calculation results indicates that the research of this paper can provide the theoretical basis for overall design and equipment development of ship.

关键词： Ship Operational readiness Indicator system Model Application

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