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5th International Conference on Automation, control and Robotics Engineering, CACRE 2020

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

ISBN: (纸本)9781728198880

underwater acoustic target recognition has long been an internationally recognized problem. This paper combines the method based on LOFAR spectrogram and the deep convolutional neural network of deep learning hot spot method for underwater target radiated noise recognition, making full use of the separability information of target noise in different dimensions, and using the time spectrum chart as the depth Learn to enter data. In this paper, the basic principle and specific application process of the method are analyzed in detail, and the measured data are simulated and classified, and the simulation diagram and test results are given. The results show that the recognition rate of underwater target recognition with this method is high. © 2020 IEEE.

关键词： Convolutional neural networks

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Echo Highlight Model of underwater Target and Design of FPGA Signal Simulation Module 5

Echo Highlight Model of Underwater Target and Design of FPGA...

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5th International Conference on Communication, Image and Signal Processing, CCISP 2020

作者： Chen, Hu Fengzhen, Zhang Zhaohui, Zhang Yuan, Peng Yi, Jiang Science and Technology on Underwater Test and Control Laboratory Dalian China

ISBN: (纸本)9781728185897

The rapid development of FPGA provides a new platform for target signal simulation. In this paper, we first analyze the mathematical model of underwater target echo highlights, and then design a set of signal generating module based on FPGA, which can simulate the target echo signal under specific target characteristics according to the preset highlight table and copy signal. With 5° as the unit, the angle of incidence is switched between 0°-180° by using the mechanical keys. The angle can be displayed in real time through the digital tube. The output signal can be directly connected to the transducer and power amplifier to achieve a specific sound source level. Finally, the signal acquisition test of the simulation module is carried out. 37 angles in the range of 0°-180° were collected and analyzed. The distribution of echo highlights was compared with the table of highlights after matched filter. The module's performance meets the expectation. © 2020 IEEE.

关键词： Field programmable gate arrays (FPGA)

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Experimental Study on Direction of Arrival Estimation of Acoustic Signals Based on Hyperbeam Cross Spectrum

Experimental Study on Direction of Arrival Estimation of Aco...

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2020 IEEE International Conference on Signal Processing, Communications and Computing, ICSPCC 2020

作者： Mingwei, Zhang Chunping, Zhai Yansen, Liu Shuwei, Che Science and Technology on Underwater Test and Control Laboratory Dalian China

ISBN: (纸本)9781728172019

The direction of arrival estimation(DOA) technology plays an important role in acoustic beacon fast search and rescue at sea. In this paper, the DOA resolution of the split array beam-forming is improved by using the method of Hyper Beam-Forming(HBF) cross-spectrum. Under the condition of a certain signal-to-noise ratio, HBF cross-spectrum beam-forming method based on split array can effectively improve main lob width, reduce side-lobe effect and improve the resolution of direction finding significantly. Provide an effective judgment basis for the location estimation of acoustic beacons by using the intersection area of multi-point high-precision direction finding rays and the mean intersection. In this paper, the theoretical derivation process of the proposed method is given, and the error analysis of the azimuth estimation is carried out. The simulation and experimental results show that the side-lobe can be obviously suppressed by the split array HBF cross-spectrum method, and the accuracy and reliability of the target DOA estimation can be improved. The fusion method of the intersection area of multi-ray and the intersection point of multi-ray mean can effectively reduce the acoustic beacon search radius and improve search efficiency. © 2020 IEEE.

关键词： Signal to noise ratio

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Echo signal simulation system 3

Echo signal simulation system

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3rd International Conference on Mechanical, Electric and Industrial Engineering, MEIE 2020

作者： Gao, Feng Zhang, Yang Wang, Zhenshan Li, Guijuan Science and Technology on Underwater Test and Control Laboratory Dalian China

In order to meet the demand of realistic simulation for complex target echo signal in water, the indirect method of frequency domain is employed to simulate the target echo signal in this paper. The plate element method is first used to forecast complex target echo characteristics in typical water. After generating frequency response function data, the data is imported into the echo signal simulation system. The system adopts FPGA real-time signal processing system based on PXIe bus. It receives hydrophone output signal by A/D sampling, extracts the incident acoustic signal and makes frequency domain transformation. After multiplying the transformed signal and frequency response function, scattering echo spectrum is obtained. And then the time domain transformation is made to get the time series of the echo signal. The series is loaded into the transmitting transducer by the power amplifier and the echo signal is simulated. The system has the high fidelity of the model, stable and reliable hardware system, and software system for easy operation. © 2020 Published under licence by IOP Publishing Ltd.

关键词： Power amplifiers

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Study on the characteristics of dolphins click signal 5

Study on the characteristics of dolphins click signal

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5th International Conference on Communication, Image and Signal Processing, CCISP 2020

作者： Zhaohui, Zhang Yuan, Peng Science and Technology on Underwater Test and Control Laboratory Dalian China

ISBN: (纸本)9781728185897

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 0-200khz. © 2020 IEEE.

关键词： Signal processing

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Occurrence, distribution and risk assessment of antibiotics at various aquaculture stages in typical aquaculture areas surrounding the Yellow Sea

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Journal of Environmental Sciences 2023年第4期126卷 621-632页

作者： Jiachao Zhang Xuanrui Zhang Yang Zhou Qianfan Han Xiaoli Wang Chao Song Shuguang Wang Shan Zhao Shandong Key Laboratory of Water Pollution Control and Resource Reuse School of Environmental Science and EngineeringShandong UniversityQingdao 266237China Water Science and Environmental Engineering Research Center College of Chemical and Environmental EngineeringShenzhen UniversityShenzhen 518060China Qingdao Municipal Bureau of Ecology and Environment Qingdao 266003China Analysis and Test Center Qilu University of Technology(Shandong Academy of Sciences)Jinan 250014China

The pollution of antibiotics commonly existed throughout the entire aquaculture process,but the residues of antibiotics at different aquaculture stages have rarely been *** study investigated the occurrence,distribution and risk assessment of antibiotics at different aquaculture stages (the non-aquaculture stage,the early aquaculture stage,the middle aquaculture stage,and the late aquaculture stage) in two typical marine aquaculture areas(Mahegang River and Dingzi Bay) surrounding the Yellow *** and tetracyclines were commonly used antibiotics in the aquaculture of these areas with high detection frequencies (17%to 83%).Compared among four aquaculture stages,the highest concentration of antibiotics (9032.08 ng/L) in aquaculture ponds was detected at the late aquaculture *** the antibiotic pollution level of natural water was directly related to the aquaculture ***,at the aquaculture stages,the detection frequency of antibiotics in sediments was higher than that at the non-aquaculture *** on the correlation analysis,the concentration of main antibiotics in water showed a positive correlation with total nitrogen (p<0.05) and chlorophyll a (p<0.01),while it showed a negative correlation with salinity (p<0.01) in coastal water of the Dingzi *** to the risk assessment,with the development of aquaculture stages,the selection pressure of fluoroquinolones and tetracyclines on resistant bacteria had *** the ecological risks caused by sulfonamides and tetracyclines to aquatic organisms had also increased ***,this study may provide a reference for formulating regulatory policies regarding antibiotic use at different aquaculture stages.

关键词： Antibiotics Aquaculture stages Correlation analysis Risk assessment

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Low-radioactivity ultrasonic hydrophone used in positioning system for Jiangmen Underground Neutrino Observatory

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Nuclear Science and Techniques 2022年第6期33卷 102-113页

作者： Duo Teng Jiang-Lai Liu Guo-Lei Zhu Yue Meng Yuan-yuan Zhang Tao Zhang Kai Luo Rui Li Jia-Qi Hui School of Marine Science and Technology Northwestern Polytechnical UniversityXi’an 710072China National Key Laboratory for Underwater Information Processing and Control Northwestern Polytechnical UniversityXi’an 710072China School of Physics and Astronomy Shanghai Jiao Tong UniversityShanghai 200240China Tsung-Dao Lee Institute Shanghai Jiao Tong UniversityShanghai 200240China

To satisfy the accurate positioning requirement of the calibration source in the Jiangmen Underground Neutrino Observatory, a Tonpilz-type hydrophone with low radioactivity and high electroacoustics is *** radioactivity of the proposed hydrophone is strictly controlled by selecting pure raw materials, especially active piezoelectric ceramics. The electroacoustic performance of the hydrophone is improved by making structural optimization. High sensitivity and aimed directivity are achieved using 33-mode piezoelectric ceramic rings arranged in series and improvement in the radiating head of the Tonpilz hydrophone, respectively. All electroacoustic performances are studied through finite element *** simulations indicate that the electroacoustic performances of the hydrophones in linear alkylbenzene-based liquid scintillator can be approximately predicted according to the results in water because their differences caused by two types of acoustic media, water and liquid scintillator, are known. The tests show that the hydrophone prototype can achieve a maximum sensitivity of-209.3dB and a beamwidth of 132.2° at a frequency of 143 *** addition, eight hydrophones only contributed to a background radioactivity level of 26 ± 4 mHz in the neutrino analysis.

关键词： JUNO Liquid scintillator Tonpilz hydrophone Low radioactivity Sensitivity Directivity Finite element

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Temperature and strain sensitivities of surface and hybrid acoustic wave Brillouin scattering in optical microfibers

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Chinese Physics B 2022年第9期31卷 333-339页

作者： Yi Liu Yuanqi Gu Yu Ning Pengfei Chen Yao Yao Yajun You Wenjun He Xiujian Chou Taiyuan University of Technology Key Laboratory of Advanced Transducers and Intelligent Control SystemMinistry of Education and Shanxi ProvinceTaiyuan 030024China Taiyuan University of Technology Institute of Optoelectronic EngineeringCollege of Physics and OptoelectronicsTaiyuan 030024China Strong Digital Technology Co. Ltd.(Thinvent)Nanchang 410000China North University of China Key Laboratory of Instrumentation Science and Dynamic Measurement Ministry of EducationTaiyuan 030051China North University of China College of Mechatronics EngineeringTaiyuan 030051China North University of China Science and Technology on Electronic Test and Measurement LaboratorySchool of Instrument and ElectronicsTaiyuan 030051China

Temperature and strain sensitivities of surface acoustic wave(SAW)and hybrid acoustic wave(HAW)Brillouin scat-tering(BS)in 1μm-1.3μm diameter optical microfibers are *** contrast to stimulated Brillouin scattering(SBS)from bulk acoustic wave in standard optical fiber,SAW and HAW BS,due to SAWs and HAWs induced by the coupling of longitudinal and shear waves and propagating along the surface and core of microfiber respectively,facilitate innovative detection in optical microfibers *** highest temperature and strain sensitivities of the hybrid acoustic modes(HAMs)are 1.082 MHz/℃and 0.0289 MHz/με,respectively,which is suitable for microfiber sensing applica-tion of high temperature and strain ***,the temperature and strain sensitivities of the SAMs are less affected by fiber diameter changes,ranging from 0.05 MHz/℃/μm to 0.25 MHz/℃/μm and 1×10^(-4) MHz/με/μm to 5×10^(-4) MHz/με/μm,*** can be found that that SAW BS for temperature and strain sensing would put less stress on manufacturing constraints for optical ***,the simultaneous sensing of temperature and strain can be realized by SAW and HAW BS,with temperature and strain errors as low as 0.30℃-0.34℃and 14.47με-16.25με.

关键词： Brllouin scatering surface acoustic waves hybrid acoustic waves optical microfiber sensing

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underwater Transducer Simulation Software Based on Finite Element Method

Underwater Transducer Simulation Software Based on Finite El...

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OCEANS

作者： Junwei Wang Zhong Luo Duo Teng Guolei Zhu School of Marine Science and Technology National Key Laboratory for Underwater Information Processing and Control Northwestern Polytechnical University Xi'an China

To remove the limitation of the special technical threshold in simulating or designing the transducer, an underwater transducer simulation software (UTS) is developed. UTS utilizes the interactive operation and the parametric design to achieve the automatic solution of the transducer. The finite element technology is the essences of UTS. In this study, the ANSYS processes are encapsulated by the ANSYS Parametric Design Language (APDL) macro and the JAVA language to achieve the electroacoustic simulations of a Tonpilz transducer. The results indicate that UTS is qualified in the transducer simulations.

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Comparison of Class I Flextensional Transducers with Concave Staves Machined by Different Materials

Comparison of Class I Flextensional Transducers with Concave...

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OCEANS

作者： Duo Teng Junwei Wang Zhong Luo Guolei Zhu School of Marine Science and Technology National Key Laboratory for Underwater Information Processing and Control Northwestern Polytechnical University Xi’an China

A Class I concave stave flextensional transducer is developed. Aiming at the electroacoustic performance of low frequency, high power, light weight and small size, the effect of the concave staves machined by the different materials on the flextensional transducer is studied. The finite element simulations illustrate the effect of the aluminium alloy, TC4 titanium alloy and 304 steel concave staves. The prototypes of the Class I concave stave flextensional transducer have been designed and fabricated. They have the size of Φ 96 × 160 mm, the weight of below 3 kg. Moreover, their resonance frequency is below 1.6 kHz and their source level is more than 194 dB. The tests verified the changes caused by the concave staves with different materials.

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