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检索条件"机构=Scientific and Technology on Underwater Test and Control Laboratory"

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Research on the influence of object surface discontinuity on target acoustic scattering characteristics 6

Research on the influence of object surface discontinuity on...

引用

6th International Conference on Communication, Image and Signal Processings, CCISP 2021

作者： Wang, Rui Zhang, Yang Jia, Bing Science and Technology on Underwater Test and Control Laboratory Dalian China

ISBN: (纸本)9781665432795

This article focuses on the influence of the discontinuous surface of a combination of simple structures on the scattering characteristics of the *** three-dimensional vector model is used to simulate the constructed model group. Through numerical simulation, the scattering characteristics of the target discontinuous surface are analyzed on the relationship between the gap width and the wavelength, and the target characteristic changes caused by the target discontinuous surface are *** the same working conditions, for different incident angles, the trend of the echo energy at the gap changing with frequency is almost the *** different types of gap shapes, the target echo energy is weak when the gap boundary is smooth. © 2021 IEEE

关键词： Surface scattering

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Experimental study on waveguide invariant passive ranging based on buoy 6

Experimental study on waveguide invariant passive ranging ba...

引用

6th International Conference on Communication, Image and Signal Processings, CCISP 2021

作者： Wang, Zhizhuan Zhang, Mingwei Zhang, Yang Li, Guijuan Zhang, Xuegang Science and Technology on Underwater Test and Control Laboratory Dalian China

ISBN: (纸本)9781665432795

The important feature of ocean waveguides is that there is a stable and observable interference structure in the low-frequency sound *** interference structure can be described by only one scalar parameter beta, which is called waveguide invariant. It reflects the relationship between distance, frequency and interference fringe slope. Therefore, the motion parameter information of the target can be obtained by analyzing the LOFAR diagram of the radiated noise of a moving ship, as a kind of equipment which is easy to be placed in the marine environment, buoy has been widely used in the field of underwater acoustics. In this paper, using the buoy test data, the distance information of the passive target is obtained by the waveguide invariant method, which overcomes the defect that the traditional buoy ranging method needs multiple buoys. The distance estimation of the passive target is realized only by a single buoy, and the distance measurement error within the effective range is no more than 10%. © 2021 IEEE.

关键词： Buoys

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Research on the real-time positioning method of vector buoys in deep sea

Research on the real-time positioning method of vector buoys...

引用

2020 International Conference on Electronics, Communications and Information technology, CECIT 2020

作者： Wang, Zhizhuan Zhang, Mingwei Li, Ling Li, Guijuan Chen, Yunfei Zhang, Xuegang Science and Technology on Underwater Test and Control Laboratory Dalian China

Buoys are generally difficult to anchor in Deep-sea environment, at the same, due to the influence of long-term in the ocean environment, the location relationship between each other buoys will change, which may cause the traditional predicted method of buoy system trapped in losing efficacy. This paper researched on the problem of the buoy baseline length vary positioning method applicability, on the basis of this study, focused on the theoretical analysis and simulation of applicability to different positioning method. Following this, a realtime positioning method based on vector buoys system in deep sea is presented. Covered the applicability shortage of traditional underwater acoustic passive positioning, used multiple vector buoys to locate the target jointly, and provide a theory basis for real-time positioning function of vector buoys in engineering. The simulation results show that this method is feasible and effective. © Published under licence by IOP Publishing Ltd.

关键词： Buoys

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Feature Mining Method Based on Deep Learning for underwater Electric Field Prediction in Marine Environment

Feature Mining Method Based on Deep Learning for Underwater ...

引用

Communication Systems (ECCS), European Conference on

作者： Pei Cui Kaina Jiang Jin Yue Yuanzhe Wu Yibo Fu Science and Technology on Underwater Test and Control Laboratory Dalian China Dalian Institute of Measurement and Control Technology Dalian China

The low-frequency electric field generated by various electromagnetic effects in the ocean overwrites the useful signal in amplitude and frequency, as a background distraction field for electric field detection. Effective electric field characteristic analysis and prediction methods are helpful to improve the environmental adaptability of the equipment and the ability of target detection. The deep learning method is used to mine the characteristics of underwater electric field in the marine environment to improve the prediction accuracy. In order to explore the relationship between seawater environmental parameters and electric field characteristics, parameters including measure time, seawater conductivity, water depth and wave height are used as independent variables, and the amplitude of the underwater electric field in the marine environment is used as the dependent variable. The relationship model between independent variables and dependent variables are established by deep neural network training to realize the prediction of underwater electric field characteristics in the marine environment. The results of 103 training samples and 2 test samples show that the method can effectively identify the test samples, and can be used for the mining and prediction of underwater electric field characteristics, as well as the detection and identification of weak electric field signals submerged in the marine environment.

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Influence of Physical Parameters on Echo Spectrum of underwater Target

Influence of Physical Parameters on Echo Spectrum of Underwa...

引用

IEEE/OES China Ocean Acoustics (COA)

作者： Yunfei Chen Dapeng Yu Bing Jia Zhenshan Wang Jintao Yong Yanjie Wang School of Information and Communication Engineering Dalian University of Technology Dalian China Science and Technology on Underwater Test and Control Laboratory Dalian China

ISBN: (数字)9798350340297

ISBN: (纸本)9798350340303

The elastic scattering features of the underwater target scattering wave depend on the physical parameters of the target, such as the material and structure. Intuitively evaluating the influence of the elastic scattering wave on the characteristics of the whole scattering wave signal is difficult due to the coupling and superposition of the elastic scattering wave and the geometric scattering wave of the target. Based on the different modulation characteristics of broadband echo spectrum produced by target geometry scattering and elastic scattering wave, this paper characterizes and studies the modulation features of echo spectrum and tests the influence of physical parameters on the echo spectrum of underwater target using several simple cylindrical targets with different physical parameters. Moreover, the geometric scattering wave and the elastic scattering wave of the simple target echo are extracted using the fractional Fourier transform (FrF $T$ ) domain filtering method, and the influence of physical parameters on the echo spectrum is quantitatively analyzed.

关键词： Geometry Couplings Fourier transforms Filtering Oceans Scattering Modulation Feature extraction Acoustics Broadband communication

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A Hydroacoustic Positioning Method Based on Analysis of the Error Region of Three-circle Intersection

A Hydroacoustic Positioning Method Based on Analysis of the ...

引用

2021 OES China Ocean Acoustics, COA 2021

作者： Cui, Pei Jiang, Kaina Lv, Junjun Zhao, Zhe Yue, Jin Jiao, Dawen Dalian Institute of Measurement and Control Technology Dalian China Science and Technology on Underwater Test and Control Laboratory Dalian China

ISBN: (纸本)9781728181905

A hydroacoustic positioning method based on three-circle intersection presented in this paper is used to locate the underwater measuring units equipped with sensors to measure magnetic and electric field. Due to the existence of controllable and non-controllable error sources such as measurement distance of underwater acoustic and entry depth of the surface positioning device in the positioning process, there is a triangle error area that makes the positioning results not satisfactory. In order to improve the positioning accuracy, the convergence and diffusion law of the triangle error area are studied with data analysis software by setting error ranges of the positioning circle radius and the step size in response to the measured results in sea test. The analysis results show that the optimized positioning method based on the three-circle intersection can well reduce the size of the triangle error area and effectively improve the positioning accuracy. © 2021 IEEE.

关键词： underwater acoustics

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Numerical simulation, verification and experiment validation on hydrodynamic performance and radiated noise properties of skewed propeller 3

Numerical simulation, verification and experiment validation...

引用

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

作者： Ma, Fuqiang Liu, Yansen Mu, Lin Jia, Bing Scientific and Technology on Underwater Test and Control Laboratory Dalian China

Numerical simulation of hydrodynamic performance and radiated noise properties of the standard propeller is carried out by computational fluid dynamics (CFD) approach and acoustic analogy equation, and verifying and validating the numerical result by experiments in cavitation tunnel. Taking Potsdam Propeller test Case (PPTC) propeller as an example, the geometric model, grid model and numerical simulation boundary conditions are established. The comparison between numerical calculation and experimental results of open water characteristics of propeller, including thrust coefficient, torque coefficient and efficiency shows that the numerical model is reliable. Under the condition of good agreement between numerical simulation and experimental results of unsteady hydrodynamic characteristics, which contains the pressure distribution of blades, cavitation properties, the wake vortex distribution of the propeller, the numerical calculation and characteristic analysis of propeller radiated noise are carried out. The results show that the relation between the radiated noise of the propeller and the inherent structure and the motion state is correlated. The research can provide a theoretical basis for the target detection and recognition based on such characteristics. © 2020 Published under licence by IOP Publishing Ltd.

关键词： Propellers

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Navigation radar image fusion of different scales based on improved wavelet transform rules

Navigation radar image fusion of different scales based on i...

引用

Chinese control and Decision Conference, CCDC

作者： Haoyan Zhang Lu Zhang Fangyuan Jin Yuanyuan Guo Yunying Wang Yunsheng Fan Science and Technology on Underwater Test and Control Laboratory Dalian China College of Marine Electrical Engineering Dalian Maritime University Dalian China

ISBN: (数字)9798350387780

ISBN: (纸本)9798350387797

Due to the disadvantages of the image fusion system such as unclear target contour of long-range radar image, insufficient perceptual range of near-range radar image and insufficient detail of traditional wavelet transform fusion rules for processing high frequency coefficients, the fused images cannot meet the requirements of large information volume, high definition and small discrepancy. To solve this problem, the maximum Brenner region energy wavelet transform image fusion (MBREWTIF) algorithm is proposed, Firstly, the alignment of the two radar images is realized to prepare for the next step of algorithmic fusion. Secondly, an improved fusion rule for high frequency coefficients is devised based on the wavelet transform image fusion algorithm. Finally, the Brenner region energy method is developed by combining the energy gradient of the Brenner function method and the improved fusion weight in the region energy method. The simulation results verify that the proposed MBREWTIF algorithm improves the content and clarity of image information and reduces the discrepancy in the dual radar fusion process compared with other existing algorithms.

关键词： Wavelet transforms Navigation Simulation Radar imaging Market research High frequency Image fusion

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Coupled analysis of Braceless semi-submersible offshore wind turbine under different water depths 32nd

Coupled analysis of Braceless semi-submersible offshore wind...

引用

32nd International Ocean and Polar Engineering Conference, ISOPE 2022

作者： Zhou, Zhimin Wang, Xianzhi Zhou, Xiangbo Qiao, Dongsheng Yan, Jun Ning, Dezhi Science and Technology on Underwater Test and Control Laboratory the 760th Research Institute of China Shipbuilding Industry Corporation Dalian China State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology Dalian China

ISBN: (纸本)9781880653814

Braceless semi-submersible floating offshore wind turbine (FOWT) is subjected to environmental loads during its service, and the different combinations of wind, wave, and current environmental loads have different contributions to the motion responses of the offshore wind turbine platform. Under the different water depth of 100m, 150m, 200m, the time domain motion response calculation model of floating wind turbine platform was established, and the corresponding time-domain motion of wind turbine platform with six degrees of freedom and the mooring line tension were analyzed. The results show that the maximum motion response and mooring line tension are all in line with the engineering requirements. The results of this study provide reference for further research on the design of mooring system. © 2022 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Semisubmersibles

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Study on Fluctuation Characteristics of Acoustic Signals under Density Layered Fluid Disturbance

Study on Fluctuation Characteristics of Acoustic Signals und...

引用

IEEE/OES China Ocean Acoustics (COA)

作者： Jintao Yong Yunfei Chen Zhenshan Wang Bing Jia Rui Wang Shiqi Mo Science and Technology on Underwater Test and Control Laboratory Dalian China College of Underwater Acoustic Engineering Harbin Engineering University Harbin China College of Information and Communication Engineering Dalian University of Technology Dalian China

ISBN: (数字)9798350340297

ISBN: (纸本)9798350340303

This study investigates the fluctuation characteristics of acoustic signals in the presence of flow field perturbations within density-stratified fluids through laboratory simulation experiments. A density stratification tank was used to replicate the ocean's stratified environment. The SUBOFF scaled model was employed to mimic the underwater vehicle's navigation process in towing mode. controlled density stratification simulation experiments were conducted to explore the acoustic signal fluctuation characteristics within the wake flow field of the submerged model. Data on the undulation properties of acoustic signals that propagated through the wake flow field of the underwater vehicle were collected. The undulation characteristics of the acoustic signal at two towing speeds and various spatial positions were analyzed. In alignment with the typical marine environment characteristics, this study designed the stratification conditions, the scale of the scaled model, and the towing speed based on the Froude number (Fri) similarity criterion and the geometric similarity law. The analysis of the experimental results indicates that the fluctuating frequency of the acoustic signal amplitude diminishes over time as the wake dissipates post-target passage. Concurrently, the intensity of the high-frequency fluctuation component of the signal also decreases with the dissipation of the wake.

关键词： Time-frequency analysis Fluctuations Fluids Navigation Perturbation methods Oceans Attenuation Acoustics underwater vehicles

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