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International Conference on Intelligent Human-Machine Systems and Cybernetics, IHMSC

作者： Yaru Liu Yadong Liu Yang Yu Jun Jiang Zongtan Zhou Dewen Hu College of Mechatronics Engineering and Automation National University of Defense Technology Changsha China

ISBN: (纸本)9781509007691

This paper presents a dynamic brain-computer interface (BCI) approach for multiple mobile targets selection in complex scene. In this study, two dynamic paradigms based on the P300 and the steady-state visually evoked potential (SSVEP) respectively were devised and tested by experiments. In the experiments, a video in which several people walks around in a laboratory is presented on the screen, with the random flashes or periodic flickers at different frequencies superimposed on the mobile objects. Then subjects were told to select the target using these paradigms. Eight subjects participated in the experiments. During the P300 session, each subject performed 48 online P300 tasks. They achieved an average accuracy of 85.67%. In the SSVEP session, the optimal stimulation time for each subject was selected through different sessions, and the average accuracy and response time were 83.6% and 3.875s, respectively. The study indicated the feasibility and efficiency of dynamic target selection BCI approaches, and the BCIs we designed can be used in other fields to extend the scope of applications.

关键词： Electroencephalography Visualization Mobile communication Brain-computer interfaces Electric potential Electrodes Signal processing

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Temperature compensation of eddy current sensor based on temperature-voltage model

Temperature compensation of eddy current sensor based on tem...

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World Congress on Intelligent Control and automation (WCICA)

作者： Yaojia Zheng Jun Wu Yu Yang College of Mechatronics Engineering and Automation National University of Defense Technology Changsha China

ISBN: (纸本)9781467384155

The output of the eddy current sensors are sensitive to the influence of temperature changes, the working environment temperature changes directly affect the output stability of eddy current sensor. Comprehensive analysis of the eddy current sensor output and temperature variation relationship using curve fitting method to obtain the temperature-voltage curve equation comprehensively compensates the temperature drift of the sensor. The experimental test results show that this kind of method to inhibit the temperature drift of sensor has a good effect.

关键词： Temperature sensors Temperature measurement Temperature Fitting Eddy currents Mathematical model Curve fitting

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Linear permanent magnet motor blend brake system simulation for electromagnetic launcher

Linear permanent magnet motor blend brake system simulation ...

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World Congress on Intelligent Control and automation (WCICA)

作者： Lei Song Jun Wu Yu Bao College of Mechatronics Engineering and Automation National University of Defense Technology Changsha China

ISBN: (纸本)9781467384155

The weapons and equipment are demanded to have strong maneuverability on the modern battlefield. The braking distance of the linear motor for electromagnetic launcher should be short to meet the launching demand. For now, the majority of brake methods are time consuming, and braking distances are long. Under the circumstances, a linear permanent magnet motor short distance blend brake system for electromagnetic launcher is proposed, which consists of reverse connect brake, Halbach permanent magnet eddy current brake and hydraulic brake. Finally, to validate the design, a associated simulation model is built, and the proposed method has been verified by the simulated results.

关键词： Brakes Force Eddy currents Permanent magnet motors Permanent magnets Brushless DC motors

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An Obstacle Detection Algorithm Based on Ultrasonic Sensors for Autonomous Land Vehicle

An Obstacle Detection Algorithm Based on Ultrasonic Sensors ...

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2016 International Conference on mechatronics,Control and automation engineering(MCAE2016)

作者： Huihai Cui Yan Li Jinze Liu College of Mechatronics Engineering and Automation National University of Defense Technology College of Information Science and Engineering Central South University

An dynamic filtering based obstacle detection algorithm is proposed for the navigation and control of Autonomous Land Vehicle(ALV). The algorithm detects the obstacles using sequential sonar data from dual sonar sensors. The sonar model is described at first. Then the obstacles' features,depicted as lines, are extracted. Finally a dynamic data filtering algorithm is described, in which the sonar return data is firstly processed through dynamic filtering using the orientation and the trajectory information of the vehicle. The algorithm's validity is approved through a field test in cross-country environment.

关键词： Autonomous Land Vehicle ultrasonic sensor obstacle detection dynamic filtering

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Achieving high bit rate logical stochastic resonance in a bistable system by adjusting parameters

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Chinese Physics B 2015年第11期24卷 146-150页

作者：杨定新谷丰收冯国金杨拥民 Andrew Ball College of Mechatronics Engineering and Automation National University of Defense Technology Centre for Efficiency and Performance Engineering University of Huddersfield

The phenomenon of logical stochastic resonance （LSR） in a nonlinear bistable system is demonstrated by numerical simulations and experiments. However, the bit rates of the logical signals are relatively low and not suitable for practical applications. First, we examine the responses of the bistable system with fixed parameters to different bit rate logic input signals, showing that an arbitrary high bit rate LSR in a bistable system cannot be achieved. Then, a normalized transform of the LSR bistable system is introduced through a kind of variable substitution. Based on the transform, it is found that LSR for arbitrary high bit rate logic signals in a bistable system can be achieved by adjusting the parameters of the system, setting bias value and amplifying the amplitudes of logic input signals and noise properly. Finally, the desired OR and AND logic outputs to high bit rate logic inputs in a bistable system are obtained by numerical simulations. The study might provide higher feasibility of LSR in practical engineering applications.

关键词： logical stochastic resonance high bit rate logic gate

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A new process chain for ultra-precision machining potassium dihydrogen phosphate (KDP) crystal parts 16

A new process chain for ultra-precision machining potassium ...

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16th International Conference of the European Society for Precision engineering and Nanotechnology, EUSPEN 2016

作者： Guan, Chaoliang Hu, Hao Tie, Guipeng Luo, Xichun College of Mechatronics Engineering and Automation National University of Defense Technology Changsha Hu'nan410073 China Department of Design Manufacture and Engineering Management Centre for Precision Manufacturing University of Strathclyde GlasgowG11XQ United Kingdom

ISBN: (纸本)9780956679086

Potassium dihydrogen phosphate (KDP) crystal parts used in high power laser systems require high figure accuracy and high laser induced damage threshold (LIDT). However KDP crystal is extremely soft, hygroscopic, brittle and thermally sensitive, which make it difficult to meet the requirements via conventional processing methods. This paper puts forward a new process chain for ultra-precision machining KDP crystals, including single point diamond turning (SPDT), magnetorheological finishing (MRF) polishing and ion beam figuring (IBF) polishing processes. A compensation SPDT process is developed as the first step of the process chain to reduce machining errors (due to vacuum suction force, spindle unbalance, etc.). As a result high shape accuracy and fine surface roughness is obtained with high machining efficiency Non- Aqueous and abrasive-free MRF polishing process is then employed to remove the diamond turning marks and further improve shape accuracy and increase the LIDT. Ion beam figuring (IBF) polishing is introduced as the final step of the process chain to remove the impurity layer. Experiments are carried out to evaluate the effectiveness of the proposed ultra-precision process chain.

关键词： Potassium compounds

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Research on the influence of track periodic short-wave irregularity on low-speed maglev train

Research on the influence of track periodic short-wave irreg...

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Chinese Control Conference (CCC)

作者： Pei-Chang Yu Jie Li Lian-Chun Wang College of Mechatronics Engineering and Automation National University of Defense Technology Changsha Hunan CN

ISBN: (纸本)9781509009107

The objective of this study is to investigate the influence of track short wavelength irregularity on low-speed maglev train. First of all, the source of short-wave irregularity is discussed and the model of suspension module for the maglev train is built. Then, for the purpose of research, the train is simulated as a rigid car with 5 independent bogies which each consists two separated suspension modules. In order to find the optimal length and sensitive length of the irregularity wave for the suspension system, the suspension gap and cabin acceleration fluctuation is discussed based on the outputs of the train which is stimulated by different length of short-wave irregularities. For the further analysis, the system performance is discussed with the change of controller parameters and structure of levitation module. The numerical simulation results show that the optimal length is beneficial to the performance of maglev train and is insensitive to the variation of the controller parameters. The conclusions can be taken into consideration for the track manufacture and guideway construction for maglev train.

关键词： Suspensions Vehicles Target tracking Acceleration Stability analysis Analytical models Electromagnets

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Current sensorless control system of PMSM based on a hybrid system

Current sensorless control system of PMSM based on a hybrid ...

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2016 3nd International Conference on Energy Science and Applied Technology (ESAT 2016)

作者： Weifa Peng Surong Huang Haishan Liu Xianglin Wei School of Mechatronics Engineering and Automation Shanghai University College of Electrical Engineering East China Jiaotong University

The PMSM drive system contains the continuous state variables and the discrete variables,which is a typical hybrid *** this paper,the hybrid system theory is introduced into the analysis process,and the discrete voltage model of the inverter is embedded into the continuous state equation of the motor,and the hybrid logic dynamic model of the motor drive system is *** on this,a new control method of permanent magnet synchronous motor without current sensor is proposed,and the validity and reliability of the proposed control method are proved by MATLAB/Simulink simulation.

关键词： PMSM hybrid system current sensorless mixed logic dynamic model

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Study of the evaluation index system of fault-tolerant technology

Study of the evaluation index system of fault-tolerant techn...

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2016 3nd International Conference on Energy Science and Applied Technology (ESAT 2016)

作者： Weifa Peng Surong Huang Haishan Liu Xianglin Wei School of Mechatronics Engineering and Automation Shanghai University College of Electrical Engineering East China Jiaotong University

Reasonable fault tolerant technology index system can lead and promote the development of fault tolerant technology for electric drive *** the same time,the development of fault tolerance will also promote the research on the index *** this paper,a series of new fault tolerance indexes are proposed,and the evaluation index system of fault tolerant technology for electric drive system is first *** on the analytic hierarchy process,the evaluation system model is built up and the three kinds of fault tolerant electric drive system are *** results show that the faulttolerant technology evaluation system and the evaluation model of the electric drive system have good applicability and operability.

关键词： fault tolerant electric drive system index system Analytic Hierarchy Process(AHP)

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Adaptive Higher Order Sliding Mode Attitude Control lor Hypersonic Glide Vehicles

Adaptive Higher Order Sliding Mode Attitude Control lor Hype...

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第35届中国控制会议

作者： Kong Weijie Yuan Hao Li Peng Zheng Zhiqiang College of Mechatronics Engineering and Automation National University of Defense Technology College of Aerospace and Materials Engineering National University of Defense Technology

In this paper,a robust adaptive higher order sliding mode attitude control scheme is proposed for near space hypersonic glide *** problem can be viewed as the finite time stabilization of a higher order input-output dynamic system with bounded *** control scheme developed is based on geometric homogeneity and dual layer adaptive sliding mode *** results show the effectiveness of the proposed controller to track the guidance instruction for the 6-DOF model of hypersonic reentry vehicles.

关键词： Near space hypersonic glide vehicles dual layer adaptation high order sliding mode

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