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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21-30 订阅

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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

2024 OES China Ocean Acoustics, COA 2024

作者： Yong, Jintao Chen, Yunfei Wang, Zhenshan Jia, Bing Wang, Rui Mo, Shiqi 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: (纸本)9798350340297

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. © 2024 IEEE.

关键词： Wakes

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Multi-UUV/USV Adaptive Cooperative Search Using Online State Information 1

引用

16th International Conference on Intelligent Robotics and Applications, ICIRA 2023

作者： Li, Wenjie Gao, Jian Chen, Yimin Cui, Pei Lv, Junjun Pan, Guang School of Marine Science and Technology Northwestern Polytechnical University Xi’an710072 China Science and Technology on Underwater Test and Control Laboratory Dalian116013 China

ISBN: (数字)9789819964987

ISBN: (纸本)9789819964970

Unmanned Surface Vessel (USV) and Unmanned underwater Vehicle (UUV) detect the same task plane while located in different planes, and have to avoid obstacles autonomously in cooperative search in unknown environments. This paper proposes an adaptive cooperative search method for a USV/UUV heterogeneous cross-domain swarm based on online state information. Considering the different planes of USV/UUV detection, we establish a USV/UUV detection model with a forward-looking sonar according to the cross-sectional view. In order to guarantee the safety of USV/UUV, an obstacle avoidance algorithm based on predictive guidance is designed. Finally, the task environment is rasterized to establish the state information structure of grids and USV/UUV. On this basis, USV/UUV adaptively plans the search path according to its own motion state. The state information of each grid is updated online until USV/UUV swarm completes the search task. Simulation results show that USV/UUV can accomplish cooperative search safely in an unknown environment. Compared with a UUV homogeneous swarm, the USV/UUV swarm shortens the search time and improves the cooperative search efficiency. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2023.

关键词： Unmanned surface vehicles

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The measurement and analysis on dynamic evolution property for temperature field of trailing wake behind underwater vehicle 9

The measurement and analysis on dynamic evolution property f...

引用

9th Symposium on Novel Photoelectronic Detection technology and Applications

作者： Fangyuan, Jin Dongmei, Wang Yunying, Wang Yuanyuan, Guo Hui, Lin Lu, Zhang Science and Technology on Underwater Test and Control Laboratory No. 16 Binhai Street Zhongshan District Liao Ning Dalian China

ISBN: (纸本)9781510664432

The dynamic underwater temperature field and surface infrared characteristic of fluid field behind underwater vehicle in temperature stratification water was studied in this paper, using simulated water tank experiment and CFD (Computational Fluid Dynamics) study. In simulated water tank experiment study, the physical parameters of radio controlled scaled underwater vehicle model was fabricated with similarity ratio 1:100. Using the radio-controlled model, the movement of underwater vehicle in negative temperature gradient water was imitated, and the thermal evolution process of fluid field in water surface and under water was obtained by IR imager and underwater temperature sensors respectively. In theoretical study, the 3D N-S(Navier-Stocks) functions were calculated to verify the water tank results, and the initial condition and boundary condition were set using water tank experiment parameters. Both the simulated results and water tank experimental results could match with each other, and the results showed that: The evolutionary process of "cold trailing wake" in water surface could divided into four stages, which were called initial generation stage, stable development stage, diffusion stage and destruction stage;By reason of propeller's mixing effect, the hot water and the cold water exchanged heat unceasingly, which induced that the temperature near the surface was reduced, the temperature beneath the water was raised, and the temperature near the routes of model fluctuated with time. By comparing the theoretical value with the experimental value, the maximum simulation error of the theoretical model was 3.9dB. © 2023 SPIE.

关键词： Computational fluid dynamics

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The polarization filtering line spectrum extraction algorithm of underwater target signal

The polarization filtering line spectrum extraction algorith...

引用

2022 International Conference on Information Processing in Ocean science and technology, ICIPOST 2022

作者： Han, Xue Wang, Yang College of Intelligent System Science and Engineering Shenyang University Liaoning Shenyang110044 China Science and Technology on Underwater Test and Control Laboratory DaLian China

In order to increase the performance of underwater target line spectrum extraction, an adaptive polarization filtering line spectrum extraction method is researched in the paper. By using of the polarization characteristics of underwater target signals, the polarization characteristics of underwater target line spectrum signal is analyzed via singular value decomposition (SVD) method in frequency domain. Firstly, the line spectrum signal is presented by the eigenimage corresponding to the maximum singular value to increase the signal-to-noise ratio (SNR) of the signal. Then the polarization parameters are extracted according to the polarization characteristics of the line spectrum signals. And the line spectrum signal is filtered by constructing the polarization filtering function. The simulation results show that the output SNR of the proposed method are larger than that of conventional FFT analysis method when the SNR of the signal is larger than -9dB, and the detection probability of the proposed method is 100% when the SNR of the signal is -1 dB, while the detection probability of the conventional FFT analysis method is 27.73%. It shows that the proposed method provides a new approach for underwater line spectrum signal extraction techniques. © Published under licence by IOP Publishing Ltd.

关键词： Signal to noise ratio

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Vertical Array Cable Jitter Noise Suppression Method using Frequency Vertical Wavenumber Spectral Filtering*

Vertical Array Cable Jitter Noise Suppression Method using F...

引用

IEEE/OES China Ocean Acoustics (COA)

作者： Peng Li Shuwei Che Yu Liu Xingchen Zhao Science and Technology on Underwater Test and Control Laboratory Dalian Scientific Test and Control Technology Institute Dalian China

ISBN: (数字)9798350340297

ISBN: (纸本)9798350340303

The proposed method suppresses low-frequency cable vibration noise in a vertical array acoustic observation system using the frequency vertical wavenumber spectrum. Initially, the frequency wavenumber spectrum is extracted from the data collected from the vertical array via vertical wavenumber-depth transformation. A frequency wavenumber domain filter is designed according to the sound wave speed in the cable, and cable interference is filtered out. The signal is restored via vertical wavenumber-depth inverse transformation. The simulation results show that under the simulation conditions described herein, low-frequency line spectra such as 30 and 60 Hz can achieve a signal-to-noise ratio improvement of $>1.2\text{dB}$ .

关键词： Vibrations Filtering Frequency-domain analysis Simulation Noise reduction Jitter Acoustics Arrays Signal to noise ratio testing

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Unsteady Narrowband Spectrum Enhancement Method of Ship Noise Using PSO and Stochastic Resonance Processing

Unsteady Narrowband Spectrum Enhancement Method of Ship Nois...

引用

IEEE/OES China Ocean Acoustics (COA)

作者： Wang Yang LIU Yan-sen WU Feng-ming Science and Technology on Underwater Test and Control Laboratory Dalian Scientific Test and Control Technology Institute Dalian China

ISBN: (数字)9798350340297

ISBN: (纸本)9798350340303

To enhance the unsteady narrowband spectrum of ship noise, an unsteady narrowband stochastic resonance processing method based on particle swarm optimization (PSO) was proposed. The method adopts a bistable stochastic resonance model and takes the mean signal-to-noise ratio in the narrowband bandwidth as the fitness function; it can perform adaptive optimal selection of system parameters matching the narrowband spectrum and background noise and can enhance the narrowband spectrum signal. According to the flow of the algorithm, the simulated unsteady narrowband spectrum and the measured ship noise data are processed and analyzed. The results show that this method can easily adapt to the characteristics of the narrowband ship spectrum and enhances a weak narrowband spectrum; it has broad research prospects and good application value.

关键词： Time-frequency analysis Stochastic resonance Oceans Sea measurements Object detection Marine vehicles Particle swarm optimization Time-varying systems Narrowband Signal to noise ratio

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Simulation of Vertical Highlight Distribution of underwater Objects Based on Virtual Extended Arrays *

Simulation of Vertical Highlight Distribution of Underwater ...

引用

IEEE/OES China Ocean Acoustics (COA)

作者： Yang Zhang Guijuan Li Rui Wang Wenhao Liu Jingying Wang Bing Jia Science and Technology on Underwater Test and Control Laboratory Dalian Scientific Test and Control Technology Institute Dalian China

ISBN: (数字)9798350340297

ISBN: (纸本)9798350340303

To study the vertical distribution characteristics of object echo in water, a simulation method based on a large-aperture virtual extended array is proposed. The proposed method adopts the near-field plate element method to predict the object echo waveform at the array end and takes advantage of the high resolution of the large aperture virtual extended array beam. Two-dimensional acoustic images of the object, such as the horizontal-vertical direction, horizontal distance, and range vertical, are obtained. The results show that the object echo highlights of the single-layer shell are obtained three parts of the boat: the hull, shell, and stern, and the vertical distribution characteristics reflect the vertical position relationship of the three parts. The formation mechanism of the echo highlights includes the smooth surface echo of a large area in the hull, hull, and other parts, and the angular wave at the joint of the hull and hull and the hull and stern.

关键词： Water Sea surface Image resolution Surface acoustic waves Boats Apertures Acoustic arrays Acoustics Acoustic beams

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Overview of underwater target feature extraction methods 6

Overview of underwater target feature extraction methods

引用

6th International Conference on Mechatronics and Intelligent Robotics, ICMIR 2022

作者： Li, Xiaoyuan Hou, Hongying Wang, Kewen Meng, Chunxia Dalian Scientific Test and Control Technology Institute Binhai street 16 DaLian116013 China Science and Technology on Underwater Test and Control Laboratory Binhai street 16 DaLian116013 China

ISBN: (纸本)9781510656635

Target of underwater environments classification and distinguish using active sonar is very complex signal processing work, therefore, many research institutions in the world study the classification and recognition methods of underwater small targets using active *** recognition methods of static underwater small targets can be roughly divided into imaging method and echo method. The imaging method is based on high-frequency narrow beam to obtain the acoustic image of the target and its shadow while suppressing the reverberation interference, so as to realize the classification and recognition of the target. Imaging sonar has high working frequency, limited sonar range, and can not effectively identify false targets with similar geometry. Bright spot model and resonance scattering theory are important theoretical basis of target echo method. The two theories agree that the echo is the result of the interaction between the incident signal and the underwater target, which must contain the characteristics of the target, so it is feasible to detect the target by analyzing the characteristics of the echo signal. However, in the actual underwater target detection process, due to the weak target echo signal, complex seabed environment and target geometry, uncertain sound propagation conditions and so on, the target recognition based on echo method still has great challenges1,11,13-40 © 2022 SPIE.

关键词： Feature extraction

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Research progress on measurement technology of acoustic noise radiated by underwater vehicles 6

Research progress on measurement technology of acoustic nois...

引用

6th International Conference on Mechatronics and Intelligent Robotics, ICMIR 2022

作者： Hou, Hongying Li, Xiaoyuan Zhang, Liang Meng, Chunxia Dalian Scientific Test and Control Technology Institute Binhai street 16 DaLian116013 China Science and Technology on Underwater Test and Control Laboratory Binhai street 16 DaLian116013 China

ISBN: (纸本)9781510656635

The characteristic of far-field radiated noise of underwater vehicle is an important index to evaluate its stealth performance. Therefore, the level of radiated noise measurement technology has become a key factor affecting the ability of target acoustic recognition and stealth. This paper summarizes and analyzes the related progress of measurement technology of underwater vehicle radiated noise at home and abroad, including foreign PVLAMS, STAFAC measurement system, vector hydrophone measurement technology, civilian ship radiated noise test and standard, far-field estimation method based on actual measurement and model, etc. It provides a comprehensive reference conclusion for the research of radiated noise measurement technology and engineering practice. © 2022 SPIE.

关键词： Acoustic noise

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Modeling of Ship Target Radiated Noise Spectrum Characteristics

Modeling of Ship Target Radiated Noise Spectrum Characterist...

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Computer technology and Information science (ISCTIS), International Symposium on

作者： Xuemeng Yang Science and Technology on Underwater Test and Control Laboratory Dalian China

This paper presents a comprehensive methodology for modeling ship target radiated noise spectrum characteristics, addressing the challenges of limited data availability. The proposed methodology includes data collection, preprocessing, feature extraction, and selection, along with the development of a noise spectrum model using advanced statistical techniques. Experimental evaluations using real-world ship noise data confirm the effectiveness of the proposed methodology in accurately capturing ship target radiated noise spectra. The findings have implications for underwater acoustic analysis and naval applications.

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