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检索条件"机构=Science and Technology on Underwater Test and Control Laborary"

共 163 条记录，以下是131-140 订阅

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The fluctuation and uncertainty of acoustic measurement in shallow water wave-guide

The fluctuation and uncertainty of acoustic measurement in s...

引用

IEEE/OES China Ocean Acoustics (COA)

作者： Xuegang Zhang Ning Wang Feng Cao Jing Han Shuai Lv Ocean University of China Qingdao Shandong CN Science and technology on underwater test and control laboratory Dalian China

ISBN: (纸本)9781467399791

Acoustic measurement signals in shallow water are often randomly influenced by environmental factors, such as source-receiver geometry swing, random medium conditions as internal wave and turbulent current, the disturbance of ocean environment noise etc. The signal sound intensity and the phase fluctuations affected the uncertainty of the measured result, which will affect negatively the validity of the data and degree of confidence. At the same time, the multi-path channel in the ocean (not clear) lead into signal distortion and interference, which caused the departure from the free field measurement results, and diminish the correlation for underwater acoustic sensors. Quantitative Analysis for different factors producing the uncertainty would enhance the degree of confidence about optimized experiment schemes. The monitoring parameters for underwater environments in preceding and processing of the experiment can evaluate and calibrate the uncertainty of the metrical data. This paper? uses the normal mode model, statistical theory such as Monte Carlo method, and the MATLAB tools, to analyze the underwater acoustic uncertainty, which can be applied for precise measurement in shallow water. The actual prior data is used in the analysis, involving temperature chain and sound speed profile, the simulations showed that source-receiver depth, subbottom and surface parameters, random internal waves, and tides variously influenced the measurement results for different frequency the probability density function (PDF) and deviation for sound propagation transmit-loss are specified as a result of the quantification analysis, which caused by environment statistical distribution. The various amplitude of ocean environment noise is spliced on the temporal target signals, on the purpose of simulating the infection by different signal noise ratio (SNR) conditions, and the result showed that deviation between actual and polluted signal is less than 1 dB per 1/3 octave bandwidth, w

关键词： Measurement uncertainty Analytical models Mathematical model MATLAB Tides Monitoring Acoustics

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Mapping underwater sound noise and assessing its characteristic based on AIS

Mapping underwater sound noise and assessing its characteris...

引用

IEEE/OES China Ocean Acoustics (COA)

作者： Shuwei Che Chunxia Meng Jin Bai Wensi Wu Science and technology on underwater test and control laboratory Dalian P. R. China College of underwater acoustic engineering Harbin engineering university Harbin P. R. China

ISBN: (纸本)9781467399791

underwater noise from shipping is a growing presence throughout the world's oceans. Exposure to loud noise can have various effects on marine animals. This paper presents a method which can characterize sound exposure from shipping based on Automatic Identification System (AIS) shipping data. Firstly, the tonnage, speed, draft, latitude and longitude of each ship can be obtained from real-time AIS data. Then we calculated the source level of each ship by the *** formula. Secondly, a large scale area was derived over a regular grid having a horizontal resolution of 0.5nm×0.5nm in order to facilitate the engineering application. The sound band pressure level is calculated using the source level of a ship after making a numerical calculation of 1/3oct transmission loss at each grid point for every ship by using the real-time sound velocity profile and bottom parameters based on a fast field program. The distribution map of ambient noise was plotted from the result of incoherent superposition of the ship's noise energy. Finally ambient noise at different times,

关键词： Channel hot electron injection Artificial intelligence Sea measurements Displacement measurement Velocity measurement Sonar equipment

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Noctiluca *** in response to the mechanical stimuli of a screw propeller

Noctiluca *** in response to the mechanical stimuli of a scr...

引用

2015年第二届机电一体化与机械工程国际学术会议

作者： Jing Han Xuegang Zhang Guijuan Li Science and Technology on Underwater Test and Control Laboratory

This work presents a new experiment method studying the Noctiluca *** under the mechanical *** devoted to the study of the Noctiluca *** triggered by the screw propeller's mechanical stimuli in the *** size of the tank was 2*1**** screw propeller is fixed on a shelf and the position relative to the tank was adjustable by moving the *** methods were carried out to control the running of the screw *** the first scenario,the shelf was fixed in the center of the tank and the second scenario,the shelf moved from one side to the other in the *** the same time,the screw propeller was running with a certain *** luminescent strength of Noctiluca *** as the increase of the screw propeller's running *** were two obvious luminous areas nearby the screw propeller's *** luminescent area was bigger in the second ***,when navigational ship passing the sea area which filled with Noctiluca *** other luminescent halobios,it will stimulate the Noctiluca *** other luminescent halobios *** ship also can be detected using the bioluminescence.

关键词： image Noctiluca sp.bioluminescence in response to the mechanical stimuli of a screw propeller

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Analysis of Ocean Reverberation Characteristics Based on the Vector Hydrophones

Analysis of Ocean Reverberation Characteristics Based on the...

引用

2015 International Power,Electronics and Materials Engineering Conference(IPEMEC 2015)

作者： Bing Jia Yunfei Chen Yang Zhang Feng Gao Science and Technology on Underwater Test and Control Laboratory

ISBN: (纸本)9781510806474

Focusing on the disturbance of ocean reverberation in active sonar detection,this article researched the characteristics of vector ocean reverberation when vector hydrophones were the *** experiments and theoretic analyses,scalar and vector ocean reverberation was gained when transmitting signal with different frequencies,impulse widths,receivers at different depths,and the source levels and laws of energy attenuation were analyzed *** comparison,reverberation received by vector hydrophones was found to have characteristic of lower reverberation levels and faster attenuation,thus,vector hydrophones have the ability of anti-reverberation.

关键词： Vector Hydrophone Ocean Reverberation Measurement

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The Linear Frequency Modulation Pulse Signal Adaptive Detection Method

The Linear Frequency Modulation Pulse Signal Adaptive Detect...

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2015 International Conference on Advances in Mechanical Engineering and Industrial Informatics(AMEII 2015)

作者： Feng Gao Bing Jia Guijuan Li Mingwei Zhang Science and Technology on Underwater Test and Control Laboratory

ISBN: (纸本)9781510806481

It is first elaborated that when the transmission time of underwater acoustic waves is estimated from the transmitting end to the receiving end, LFM pulse signal is often used, because after it is processed through matched filtering, a very important phenomenon will produce, which is pulse compression that a wide pulse in the time dimension is squeezed into a narrow pulse, so that transmission time can be accurately estimated;secondly it is explained that due to the multipath effect in the shallow water, reverberation signal in the propagation process and environmental noise and other factors, when a common detection method of fixed threshold is used, often the wrong detection can be caused, an adaptive detection method is presented for this problem, that is based on the pulse compression of the LFM signal, and the adaptive detection algorithm, the correlation peak of sound waves reach time is detected;finally through processing simulated data and measured data of the sea, it is verified that the this method is effective.

关键词： LFM pulse compression correlation peak detection adaptive detection

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A Feature Evaluation and Selection Method Based on Fuzzy-fusion Model

A Feature Evaluation and Selection Method Based on Fuzzy-fus...

引用

2015 International Conference on Simulation, Modelling and Mathematical Statistics(SMMS 2015)

作者： Feng-zhen ZHANG Gui-juan LI Zheng-qing LIN Lin MU Zhao-hui ZHANG Science and Technology on Underwater Test and Control Laboratory

Feature evaluation and selection is important for improving performance of the recognition system. Single feature evaluation and selection method is frequently adopted. However, due to the negligence of the well performed feature judged by other evaluation indexes, single-dimensional feature ranking and selecting based on single evaluation index may not produce satisfying result. This article proposes a feature evaluation and selection method based on fuzzy-fusion model, which integrates several single evaluation indexes into a synthesized index to compensate the one-sidedness of single evaluation method. Based on the statistical feature sample set extracted from sound signal of underwater target, the experiment results show that the proposed method may yield improved feature evaluation and selection effect.

关键词： Fuzzy-fusion Feature evaluation Feature selection

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Simulated Research on Passive Sonar Range Using Different Hydrographic Conditions

Simulated Research on Passive Sonar Range Using Different Hy...

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2015年第4届力学与控制工程国际学术会议

作者： JingHan XueGang Zhang ChunXia Meng FengCao Science and Technology on Underwater Test and Control Laboratory

As an example using the passive sonar, it calculated the quality factor of passive sonar using the sonar equation. The sound field was calculated under different depth and range using multiform hydrographic conditions. The isoline of passive sonar quality factor was marked out on the sound field. The isoline also represented the passive sonar range. The simulation results showed that hydrographic conditions had important effect on passive sonar range. At the same hydrographic conditions, the permissible drawdown of passive sonar had important effect on passive sonar range. Thus, according to the hydrographic character, the passive sonar range could be improved by selecting suitable passive sonar permissible drawdown.

关键词： profile Simulated Research on Passive Sonar Range Using Different Hydrographic Conditions

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Rejection Of Direct Blast Interference Based on Vector Sensor adaptive Array Processing

Rejection Of Direct Blast Interference Based on Vector Senso...

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2015 International Power,Electronics and Materials Engineering Conference(IPEMEC 2015)

作者： Yunfei Chen Bing Jia Zhenshan Wang Feng Gao Sheng Li Guijuan Li Department of Ship Engineering Dalian University of Technology Science and Technology on Underwater Test and Control Laboratory

ISBN: (纸本)9781510806474

In bistatic acoustic scattering wave testing,there will be strong direct blast interference,An algorithm based on vector sensor adaptive signal processing that rejecting of direct blast interference in bistatic sonar has been studied,through computer simulation the effectiveness of this algorithm was *** test results show that when the space angle of interference and signal greater than 5 deg,the object scattering signal can be effectively estimated with six elements of vector sensor array

关键词： Direct Blast Interference Rejection Vector Sensor Adaptive Array Processing

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Reflections on selection about ship seismic sensor

Reflections on selection about ship seismic sensor

引用

2014 International Conference on Manufacturing technology and Electronics Applications, ICMTEA 2014

作者： Cui, Pei Bai, Chun Zhi Science and Technology on Underwater Test and Control Laboratory Dalian China Dalian Scientific Test and Control Technology Institute Dalian China

ISBN: (纸本)9783038353287

In the special marine environmental conditions, there are certain advantages of ship seismic wave relative to underwater acoustic signal. However, due to the poor performance of seismic wave sensor, it is difficult to effectively detect seismic signal. From the signal characteristics of ship seismic wave, we can see that the ship seismic wave signal is better than underwater acoustic signal through comparative analysis in some special environment. In the low frequency band of DC-20Hz, the energy of the ship seismic is stronger and the line spectrum is more obvious. It briefly explains the mathematical model of ocean bottom seismometers receiving ship seismic wave information based on coupling theory. Finally, this paper focuses on many factors need to be considered in the selection of seismic wave sensor from the structure, type and performance of sensor. In view of different functionality of sensor types, it is suggested to use acceleration sensor to detect the ship seismic wave signal. © (2014) Trans Tech Publications, Switzerland.

关键词： Seismic waves

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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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