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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71-80 订阅

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Study on the characteristics of dolphins click signal

Study on the characteristics of dolphins click signal

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作者： ZHANG Zhaohui PENG Yuan Science and Technology on Underwater Test and Control Laboratory

Dolphins have a strong ability of target identification in the ocean, how to use it has become a new field of *** is mainly divided into three categories in the research of dolphin communication signals namely whistle, click and emergency signals. Dolphin Click sound is mainly used for target detection and recognition. In this paper, the research group designed a pool experiment to obtain the click signal when dolphin identify rubber bar, reef, aluminum bar and steel ball, and analyzes the signal form, frequency, spectrum change rule and other information from the perspective of time domain and time-frequency domain. The number of sine waves in click signal is analyzed when dolphins identify four kind of targets. We summarize six kinds of spectrum forms to classify the acquired acoustic signals, the probability of each spectrum form is analyzed and counted when dolphins detect and identify different *** results show that the click signal emitted by dolphins in target recognition is mainly one waveform click signal. The main energy of the frequency is concentrated at 0-200 khz.

关键词： Dolphin Click Signal Processing

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Experimental Study on Forward Acoustic Scattering in Stratified Water Turbulence

Experimental Study on Forward Acoustic Scattering in Stratif...

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作者： Jintao Yong Yunfei Chen Zhenshan Wang Bing Jia Rui Wang Jianglin Wu Science and Technology on Underwater Test and Control Laboratory

In this thesis, the forward acoustic scattering characteristics of two kinds of turbulence are experimentally tested and studied through the stratified tank simulation experiment. The fluctuation of the amplitude of the turbulent forward acoustic scattering signal with space and time is analyzed. The turbulent forward acoustic scattering intensity at different detection points in space and the variation trend of the turbulent forward acoustic scattering intensity at the same detection point with time are obtained. The experimental results show that the amplitude fluctuation frequency of the forward acoustic scattering signal decreases with time. In the density thermocline, the changing trend of the amplitude and transmission time of the acoustic signal at the adjacent position in the horizontal direction with time is similar, and the magnitude value is equivalent. The changing trend and magnitude of the acoustic signal amplitude at the adjacent depth in the vertical direction are different. The turbulence intensity has a significant impact on the amplitude fluctuation of forward acoustic scattering signal.

关键词： Turbulence Forward acoustic scattering Experimental test

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Research on deduction method of underwater electric field source for ships with different conductivity of seawater

Research on deduction method of underwater electric field so...

引用

IEEE International Conference on Power, Intelligent Computing and Systems

作者： Hu Ping Science and Technology on Underwater Test and Control Laborary

ISBN: (纸本)9781728137216

The electric conductivity of seawater directly affects the attenuation law of electric field source in seawater. With the increase of conductivity in seawater, the attenuation of electric field in seawater increases, which leads to different characteristics of electric field sources in different sea areas. The magnitude and distribution characteristics of the ship's electrostatic field source are closely related to the conductivity of the sea area. Because of the limitation of the test conditions, it is difficult to obtain the electrostatic field sources under different sea water conductivity environments. In this paper, a method of deducing the field source of ship electrostatic field under different sea water conductivity is used to deduce the field source of ship electrostatic field inversion from the measured data at sea to the converted sea area, which improves the applicability and utilization value of space conversion.

关键词： Ship Conductivity Seawater Deduce Source sea water Ships Seas conductivity Electric fields Electrostatic field Deduce

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Numerical Simulation and Computing the properties of radiation noise from underwater single-propeller and contra-rotating propellers

Numerical Simulation and Computing the properties of radiati...

引用

IEEE International Conference on Signal Processing, Communications and Computing (ICSPCC)

作者： Fu-qiang MA Li-xun XIE Yan-sen LIU Science and Technology on Underwater Test and Control Laboratory Dalian China

ISBN: (数字)9781728172026

ISBN: (纸本)9781728172033

In order to study the properties of radiation noise of single-propeller and contra-rotating propellers, the numerical simulation and computing was accomplished by using RNG turbulence model, LES turbulence model, FW-H acoustic analog equation and dynamic grid model. The open water performance of single propeller and contra-rotating propellers is calculated respectively, and the calculated results are in good agreement with the published results. Then the flow field properties of single propeller and contralateral propeller are compared and analyzed, on this basis, acoustic signature analysis and computing on properties of radiation noise from underwater single-propeller and contra-rotating propellers was accomplished, the properties of pulsating sound pressure at the monitoring point are solved. From the computing results, it can be seen that there are line spectral components related to front and rear blade frequency in the noise power spectrum, the low frequency line spectrum of contra-rotating propellers is more abundant than that of single propeller.

关键词： Propellers Mathematical model Numerical models Blades Computational modeling Torque Periodic structures

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Research on Characterization Method of Ship Electric Field Source

Research on Characterization Method of Ship Electric Field S...

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IEEE International Conference on Power, Intelligent Computing and Systems

作者： Hu Ping Jiang Kaina Zhao Zhe Shi Xiaotao Science and Technology on Underwater Test and Control Laborary

ISBN: (纸本)9781728137216

It is impossible to obtain the detailed distribution of the potential and current density of the ship hull during the actual measurement because of the complex form of the underwater electric field source and the numerous influencing parameters. Therefore, it is difficult to accurately and completely grasp the parameters of the field source. According to the characteristics of field source and the distribution of electric field in sea water, the complex field source is simplified and abstracted into dipole and quadrupole sources commonly used in electromagnetic, and the characterization of different types of electric field sources for ships is completed.

关键词： Ship Conductivity Seawater Dipole Source Ships dipoles sea water Electric fields conductivity PRACTICAL test POTENTIAL DISTRIBUTION

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Optimal design of emission waveform for acoustic scattering test under multipath interference

Optimal design of emission waveform for acoustic scattering ...

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Communication, Image and Signal Processing (CCISP), International Conference on

作者： Jianglin WU Yunfei CHEN Bing JIA Guijuan LI Yang ZHANG Jintao YONG Science and Technology on Underwater Test and Control Laboratory Dalian China

ISBN: (数字)9781728185897

ISBN: (纸本)9781728185903

In order to reduce the impact of multi-path interference in the underwater target sound scattering test, the design of different forms of waveform such as CW-LFM+,CW- LFM-,CW-HFM+ and CW-HFM- are mainly studied in this paper, the bellhop model is used to simulate the shallow sea multi-path propagation environment, and the one-way attenuation and two-way impulse response of the shallow sea multi-path channel are calculated. Based on this, the scattered signal of the point target after the combined signal passes through the shallow sea two-way channel is calculated, and according to the time-domain waveform and time-frequency diagram of the scattered signal of the simulated point target, the validity of model selection and parameter setting is verified. The ambiguity graph and contour line of the analog signal and the measured signal are calculated, so the transmission waveform with better time-frequency resolution can be selected, which provides support for the detection of the sound scattering signal of complex targets under multipath interference.

关键词： Acoustics Signal resolution Time-frequency analysis Sea measurements Frequency modulation Pulse measurements Time-domain analysis

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Experimental Study on Forward Acoustic Scattering in Stratified Water Turbulence

Experimental Study on Forward Acoustic Scattering in Stratif...

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Communication, Image and Signal Processing (CCISP), International Conference on

作者： Jintao Yong Yunfei Chen Zhenshan Wang Bing Jia Rui Wang Jianglin Wu Science and Technology on Underwater Test and Control Laboratory Dalian China

ISBN: (数字)9781728185897

ISBN: (纸本)9781728185903

关键词： Acoustic scattering Fluctuations Sonar equipment Acoustics Fluids Market research Temperature

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Design of Ship Radiated Noise Signal Generator Based on FPGA

Design of Ship Radiated Noise Signal Generator Based on FPGA

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2019 IEEE International Conference on Signal, Information and Data Processing, ICSIDP 2019

作者： Chen, Hu Fengzhen, Zhang Guijuan, Li Zhaohui, Zhang Lin, Mu Wenshuai, Hu Science and Technology on Underwater Test and Control Laboratory Dalian China

ISBN: (纸本)9781728123455

The rapid development of FPGA provides a new platform for target signal simulation. Firstly, the components of ship radiated noise are analyzed in the paper. Then a module of ship radiated noise signal generator based on FPGA is designed, generating 20Hz-10kHz frequency band noise to simulate ship radiated noise. Finally, two kinds of signal are used to test the generator module, and the performance is in line with expectations. The generating module can be used as a sound source in noise experiment and can also simulate underwater targets. © 2019 IEEE.

关键词： Field programmable gate arrays (FPGA)

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Mechanism and influence of removing algae with chlorine dioxide treatment for ship ballast water 5

Mechanism and influence of removing algae with chlorine diox...

引用

2019 5th International Conference on Applied Materials and Manufacturing technology, ICAMMT 2019

作者： Jia, Linan Jiao, Dawen Yue, Yin Shi, Xiaotao Sun, Lin Science and Technology on Underwater Test and Control Laboratory Dalian China

This study aims at examining the performance of the ClO2 on treating ballast water of Dalian new port area foreign trade oil pool in the cases of different experimental parameters, and Cylindrospermopsis raciborskii (CR), Gymnodinium catenatum (GC) and Gymnodinium cf. mikimotoi (GCM) are used for this experiment. The results shows that under certain test condition, the removal rates are in proportion to the dosage of ClO2 and reaction time, and inversely proportion to pH value, humic acid and ammonia nitrogen content. Accordingly, on operating at the optimal dosage of ClO2 and parameters of experiment, this process is proven to be an effective technology to remove these three algae and organic compounds in ballast water. In ballast water, the removal ability of ClO2 for these three algae is less sensitive to pH value, humic acid and ammonia nitrogen content than to ClO2 dosage and reaction time. Removing GC, GCM and CR with ClO2 are attributed to the second order reaction. Investigating the performance of such process, could serve to develop management strategies that enable mitigating the impacts of harmful substance in ballast water and help improving and ensuring quality of ballast water. © Published under licence by IOP Publishing Ltd.

关键词： Chlorine compounds

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Research on Feature Extraction and Recognition Method of underwater Acoustic Target Based on Deep Convolutional Network

Research on Feature Extraction and Recognition Method of Und...

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Advances in Electrical Engineering and Computer Applications( AEECA), 2020 IEEE International Conference on

作者： Peibing Wang Yuan Peng Science and Technology on Underwater Test and Control Laboratory Dalian China

ISBN: (数字)9781728165219

ISBN: (纸本)9781728165226

underwater acoustic target recognition technology is an important support technology for underwater acoustic information acquisition and underwater acoustic information confrontation. Its core includes target feature extraction and classification recognition. In this paper, deep convolution neural network is applied to feature extraction and classification of underwater acoustic target signal based on LOFAR spectrum. Firstly, the extraction method and preprocessing of LOFAR spectral features are introduced. Then, the applicability of deep convolution neural network in feature extraction and LOFAR spectrum of underwater acoustic target signal is briefly analyzed. Finally, the model construction and parameter optimization method of deep convolution neural network are explained in detail. Through analysis and research, this method has good applicability in the field of underwater acoustic target recognition.

关键词： Convolution Feature extraction Biological neural networks underwater acoustics Time-frequency analysis Target recognition Fourier transforms

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