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2015 3rd International Conference on Machinery,Materials and Information technology Applications(ICMMITA 2015)

作者： Sanmin Shen Yong Ye Jiahao Deng National Defence Science and Technology Key Laboratory of Mechatronic Engineering and Control Beijing Institute of Technology National Key Laboratory of Science and Technology on Electronic Test and Measurement North University of China

A new method of high-speed object detection using planar capacitive sensor was presented. The planar capacitive consists of two electrodes. A sine signal was applied on one electrode to form a quasi-electrostatic field and another electrode was use to detect the object signal. The voltage of the detecting electrode is changed when an object approached to the planar capacitive. The detection model of the planar capacitive sensor was established. The relationship between the rendezvous distance and the voltage variation was deduced. The increase of the electrode diameter and the decrease of the electrodes space contributed to the improvement of the capacitive sensor's sensitivity. The experimental results showed that the planar capacitive sensor could achieve short range detection for high-speed object.

关键词： High-speed object detection Planar capacitive sensor Quasi-electrostatic field

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L2 Gain-Based Guidance Law with Acceleration Saturation

L2 Gain-Based Guidance Law with Acceleration Saturation

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The Society of Instrument and control Engineers Annual Conference 2015

作者： Kezi Meng Di Zhou Runle Du Department of Control Science and Engineering Harbin Institute of Technology National Key Laboratory of Science and Technology on Test Physics&Numerical Mathematics

This paper focuses on the problem of designing a 2L, gain-scheduling state-feedback guidance law with acceleration saturation based on linear matrix inequality(LMI) approach. The planar target-missile engagement is described in a polar coordinate system and the target acceleration is viewed as unpredictable disturbance. Saturated state-feedback is placed into the convex hull of a group of linear feedbacks. Furthermore,2L gain guidance problem is formulated and solved as an optimization problem with parameter-dependent LMI constraints which are then converted into a finite number of LMIs to facilitate the computation. Finally, simulation results demonstrate that the proposed guidance law copes with acceleration saturation effectively and obtains excellent guidance performance in terms of miss distance.

关键词： L2 gain guidance law acceleration saturation LPV system linear matrix inequality(LMI)

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Sparse Least Squares Support Vector Machine with L_0-norm in Primal Space

Sparse Least Squares Support Vector Machine with L_0-norm in...

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IEEE International Conference on Information and Automation

作者： Qi Li Xiaohang Li Wei Ba School of Control Science and Engineering Dalian University of Technology The Key Laboratory for Underwater Scientific Test and Control Technology Dalian Scientific Test and Control Technology Institute

ISBN: (纸本)9781467391054

Least squares support vector machine (LS-SVM) has been successfully applied in many classification and regression tasks. The main drawback of the LS-SVM algorithm is the lack of sparseness. Combing the primal least squares twin support vector machine (LS-TSVM) and the sparse LS-SVM with L_0-norm minimization, a new sparse least squares support vector regression algorithm with L_0-norm in primal space(L_0-PLSSVR) is proposed in this paper. Experiments on the artificial dataset illustrate that the novel L_0-PLSSVR algorithm achieves better sparseness and generalization performance than the SVM and LS-SVM algorithm.

关键词： Sparseness Support Vector Machine Primal Space L_0-norm

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Method of effectiveness evaluation for ATTWS based on cloud model

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Journal of Information and Computational science 2015年第12期12卷 4749-4757页

作者： Xu, Hao Kang, Fengju Li, Dan School of Marine Science and Technology Northwestern Polytechnical University Xi'an China National Key Laboratory of Underwater Information Process and Control Xi'an China School of Civil and Environmental Engineering Georgia Institute of Technology AtlantaGeorgia United States

According to the characters of Anti-torpedo Torpedo Weapon System (ATTWS), the effectiveness evaluation system of ATTWS is established, and then a method based on the cloud model is proposed to achieve the effectiveness evaluation for ATTWS. In this method, each attribute is analyzed with the cloud model and a unique normalization function, and the state of ATTWS is represented by the weight deviation interval which is also used to evaluate the effectiveness for ATTWS. The analysis for the result of an evaluation example shows that this method is feasible and effective, and well solves the problems during the progress of the effectiveness evaluation for ATTWS. Copyright © 2015 Binary Information Press.

关键词： Cloud computing

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A Feature Information Extraction Method Based on Wavelet Packet Transform with Fuzzy Threshold

A Feature Information Extraction Method Based on Wavelet Pac...

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IEEE International Conference on Information and Automation

作者： Wei Ba Jiasheng Qu Zhimin Zhou Qi Li The Key Laboratory for Underwater Scientific Test and Control Technology Dalian Scientific Test and Control Technology Institute School of Control Science and Engineering Dalian University of Technology

ISBN: (纸本)9781467391054

When the wavelet packet is used to extract signal, the result is greatly affected by the coefficient quantization threshold. It is difficult for the threshold to reflect the current state of the signal accurately, which leads to the failure of signal extraction. A novel method of extracting signal based on fuzzy threshold for wavelet packet is proposed in this paper. The wavelet packet decomposition coefficient is quantified by fuzzy threshold method. The concept of the maximum value of noise to signal ratio is given to characterize the signal's strength compared to the noise in the simulation experiment. The frequency distribution probability is computed. The maximum value of noise to signal ratio and the frequency distribution probability are used as fuzzy input. To make the computing of fuzzy threshold conveniently, the fuzzy output is set by fixed value. The simulation results show that the method can meet the needs of different frequency signals, compared to conventional filtering and matched filtering, the novel method can inhibit the influence of the noise on the signal effectively, enhance the signal extraction ability and improve the detection distance.

关键词： Wavelet packet coefficients Wavelet packet reconstruction Fuzzy threshold Signal extracting

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Agent-based modeling method for torpedo

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ICIC Express Letters 2015年第8期9卷 2285-2290页

作者： Xu, Hao Kang, Fengju Li, Liang School of Marine Science and Technology Northwestern Polytechnical University No. 127 West Youyi Road Xi’an China National Key Laboratory of Underwater Information Process and Control No. 127 West Youyi Road Xi’an China University Twente Drienerlolaan 5 Enschede Netherlands

In order to solve the problem that there is no agent-based modeling method for a torpedo, firstly, the formalized description for an agent-based torpedo is proposed, and as well, all the elements in it are particularly analyzed. Secondly, based on this description, the structure of this torpedo and the information stream in it are given. To validate the accuracy of this method, an agent-based torpedo instance and a test system that has a torpedo, a target and launch equipment are created. With the trajectories of two torpedoes, the results of this test illustrate that, the agent-based method is effective and feasible, and the intelligence of a torpedo is well demonstrated with this method. © 2015 ICIC International.

关键词： Autonomous agents

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Research on algorithm for blind source separation based on negentropy maximization

Research on algorithm for blind source separation based on n...

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2nd International Conference on Mechanical Engineering, Industrial Electronics and Informatization, MEIEI 2013

作者： Sun, Bo Qiu Tian, Zuo Xi National Key Laboratory of Science and Technology on Underwater Test and Control Dalian 116013 China

ISBN: (纸本)9783037858905

To detect week signal of underwater magnetic fields, we designed a negentropy maximization blind source separation algorithm based on the stochastic gradient descent algorithm by bring in a penalty factor. The simulation study demonstrates that the new algorithm is effective to separate the mixed-signal with high precision, to decrease the iterative calculation and to enhance the convergence rate. © (2013) Trans Tech Publications, Switzerland.

关键词： Blind source separation

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Task scheduling strategy based on multi fitness particle swarm optimization in cloud computing

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ICIC Express Letters 2014年第11期8卷 3165-3170页

作者： Xu, Hao Kang, Fengju Li, Liang School of Marine Science and Technology Northwestern Polytechnical University No. 127 Youyixi Road Xi’an China National Key Laboratory of Underwater Information Process and Control Xi’an China University Twente Drienerlolaan 5 Enschede Netherlands

For the disadvantages in typical cloud computing task scheduling strategies, a strategy based on multi fitness particle swarm optimization is proposed. In this strategy, task completion time span, operation cost and resource load equilibrium are considered, and particle encoding mode, multi fitness functions and particle updating formula are designed. The result of a simulation experiment demonstrates that this strategy is feasible and effective, and has certain exploratory significance for the cloud computing task scheduling research.

关键词： Cloud computing

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Research on feasibility of missile attitude control based on laser gyroscope

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Journal of Harbin Institute of technology(New Series) 2012年第4期19卷 110-117页

作者：程耀强徐德民万彦辉刘明雍 School of Marine Engineering Northwestern Polytechnical University National Key Laboratory for Underwater Information Process & Control Northwestern Polytechnical University The 16th Institute Chinese Aerospace Science and Technology Corporation

According to the disadvantages of traditional mechanical gyro inertial measurement unit('IMU') for steering system not being available for missile attitude control, a concept based on laser gyro IMU is proposed to realize navigation & positioning and attitude control. The concept will save three single-axis rate gyros compared with traditional missile attitude control system, and is available both for strapdown and platform inertial navigation systems. Firstly, this article analyzes the selection requirements of sensitive device for missile attitude control system, and then analyzes the feasibility of missile attitude control based on laser gyro theoretically, on this basis, from four aspects of error characteristics, anti-vibration characteristics, temperature characteristics and dynamic characteristics, validate the feasibility of the concept practically. Secondly according to the strict requirements of dynamic characteristics on attitude control system, a special design is made for gyro signal filtering used for attitude control. By changing the traditional high order FIR filter to adaptive filter and low order FIR filter, laser gyro's signal phase delay is reduced. The delay time of theoretical design is 1.5 ms. Lastly, this design is validated through an angle vibration test, and test curve indicates that the dynamic characteristics of laser gyro completely meets the requirements of the attitude control system, and the maximum delay time is 1.6144 ms, which satisfies with the attitude update rate of 2 ms per frame. This concept can simplify the missile guidance system design, at the same time, it does not reduce missile guidance accuracy, and also provides reference for the broadening of the application of laser gyro.

关键词： laser gyro attitude control dynamic characteristics adaptive filtering

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Analysis of infrared character of the temperature stratification sea surface disturbed by the propeller

Analysis of infrared character of the temperature stratifica...

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International Conference on Electronics and Optoelectronics

作者： Liu, Huanying Chen, Shengtao Qi, Yi Wang, Huili Wang, Yunying National Key Laboratory of Science and Technology on Underwater Test and Control Dalian China

ISBN: (纸本)9781612842738

The surface temperature distribution of stratified sea water is different from the surroundings disturbed by the propeller and it can express a particular infrared character. The surface temperature distribution disturbed by a propeller in the negative temperature gradient sea is studied by numerical simulation and infrared imaging. The experiment is carried out through infrared camera imaging and the temperature character of the sea surface is obtained. The results show that there is high comparability between the numerical simulation and the infrared imaging. The mechanism of the sea surface temperature difference is explained and the feasibility of monitoring the sea surface temperature by the infrared camera is also validated. © 2011 IEEE.

关键词： Surface temperature

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