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

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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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Construction of Acoustic Dipole and Its Performance Verification test in Shallow Water

Construction of Acoustic Dipole and Its Performance Verifica...

引用

2021 OES China Ocean Acoustics, COA 2021

作者： Chunxia, Meng Xiaoyuan, Li Zhongcheng, Ma Feng, Cao Hang, Su Science and Technology on Underwater Test and Control Laboratory DaLian China Dalian Scientific Test and Control Technology Insititute DaLian China

ISBN: (纸本)9781728181905

The complex underwater noise field is formed in the process of the ship's constant volume sound source sailing. Due to the large number of machinery and equipment on the ship, and the navigation state of the ship on the sea is easy to change, these factors make it difficult to obtain the low-frequency radiated noise characteristics of the ship in a stable state. Therefore, it is an effective way to understand and master the characteristics of low-frequency underwater radiated noise field by using directional sound source in controllable state. Dipole transducer is a typical directional sound source with horizontal or vertical octagonal directivity, which is widely used in seismic and logging research. However, few dipole transducers are used in underwater acoustic research. The reason is: the directional emission of underwater acoustic low-frequency transducer is a big problem in the current transducer design. The directional emission technology of low-frequency dipole transducer is related to the distance / wavelength of the radiation surface. Because the position relationship of the radiation surface is fixed, it can only form the ideal directivity at a specific frequency. This brings great inconvenience to the application of underwater acoustic low- frequency dipole transducer. Firstly, the mathematical model of sound field radiated by acoustic dipole is established;then, the common non-directional low-frequency sound source is used to construct an acoustic dipole source. By adjusting the distance between two low-frequency sound sources, low-frequency dipole signals with different frequencies can be emitted. The lake test results show that the maximum difference of horizontal directivity of dipole source is less than 0.5dB and the depth of concave point is more than 21dB;finally, the test scheme in shallow water is designed, and the low-frequency narrow-band signals of 63Hz and 80Hz are emitted by the acoustic dipole source in uniform towing state, and the receiv

关键词： underwater acoustics

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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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Modeling of Ship Target Radiated Noise Spectrum Characteristics

Modeling of Ship Target Radiated Noise Spectrum Characterist...

引用

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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Acoustic Signature Analysis and Numerical Simulation on Radiated Noise of underwater Contra-rotating Propellers

Acoustic Signature Analysis and Numerical Simulation on Radi...

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2021 OES China Ocean Acoustics, COA 2021

作者： Ma, Fu-Qiang Liu, Yan-Sen Xie, Li-Xun Hu, Wen-Shuai Science and Technology on Underwater Test and Control Laboratory Dalian China

ISBN: (纸本)9781728181905

The noise of contra-rotating propellers contributes a major part to the underwater vehicle. The special noise properties often become an important basis for detecting and identifying targets. This paper establishes the numerical simulation and calculation approach on the radiated noise properties of contra-rotating propellers, which was set up based on the theory of acoustic analogy and the large eddy simulation approach, and then the numerical simulation results are verified. Taking the DTMB contra-rotating propellers which consist of DTMB3689 and DTMB3849 as an example, the numerical calculation of the hydrodynamic performance of the contra-rotating propellers is carried out based on the solving method of Reynolds stress turbulence model and the results agree well with the experimental results. The disk velocity distribution, blade pressure distribution and hydrodynamic wake distribution of the contra-rotating propellers are analyzed. Analyzing the acoustic signature of contra-rotating propellers shows that the low frequency line spectrum not only reflects the multiplicative frequency feature, but also the additive frequency feature, and the relationship between the radiated noise of the contra-rotating propellers and its inherent structure and its motion state is correlated. © 2021 IEEE.

关键词： Hydrodynamics

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Classification technology of underwater Targets in Decision Tree Based on Different Measurement Criteria

Classification Technology of Underwater Targets in Decision ...

引用

2021 IEEE International Conference on Signal Processing, Communications and Computing, ICSPCC 2021

作者： Sun, Yue Peng, Yuan Mu, Lin Zhang, Fengzhen Cao, Lin Science and Technology on Underwater Test and Control Laboratory Dalian China

ISBN: (纸本)9781665429184

In this paper, the selection of metrics for different branch attributes will affect the final division of different feature attributes. This article shares the principles of ID3 algorithm and CART algorithm using different information criteria, and use the princiciple of maximum information gain and the principle of minimum Gini index to generate decision trees. We use grid search and crass-validation methods to optimize CART algorithm, and finally we give the recognition accuracy of the feature data of the optimized algorithm. © 2021 IEEE.

关键词： Decision trees

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Research on jellyfish detection in cold source sea area of nuclear power plant based on high-resolution multibeam acoustic imaging

Research on jellyfish detection in cold source sea area of n...

引用

2021 International Conference on Computer Graphics, Artificial Intelligence, and Data Processing, ICCAID 2021

作者： Zhang, Jianfei Zhang, Xuegang Wu, Zhongpeng Science and Technology on Underwater Test and Control Laboratory NO. 14 Binhai Street Zhongshan District Liaoning Dalian116013 China

ISBN: (数字)9781510652170

ISBN: (纸本)9781510652163

The occurrence of cold source blockage in nuclear power plant not only affects the safety of power production, but also brings challenges to nuclear safety. Cold source reliability has become another important bottleneck restricting the development of nuclear power. Based on the consideration of improving the cold source safety of nuclear power plants, this paper studies the intrusion events of several typical marine organisms in nuclear power bases at home and abroad, analyzes the causes of the events, establishes a defense system in depth for marine organisms, identification, detection, early warning and hierarchical response, and uses underwater acoustic high-resolution multi beam detection method to detect marine organisms such as jellyfish and hairy shrimp, so as to obtain their echo characteristics, Analyze its distribution density in sensitive sea areas, and give effective early warning judgment. Among them, detection and early warning is the front-end disposal measure, which can provide emergency decision support for staff. Through the development and test of corresponding key equipment, the industrial safety risk is reduced, so as to improve the reliability of cold source. © 2022 SPIE.

关键词： Nuclear power plants

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Analysis of Irregular Characteristics of Reverberation Spectrum in Shallow Sea

Analysis of Irregular Characteristics of Reverberation Spect...

引用

2021 OES China Ocean Acoustics, COA 2021

作者： Wu, Jianglin Chen, Yunfei Jia, Bing Zhang, Yang Wang, Zhizhuan Wang, Jingying Science and Technology on Underwater Test and Control Laboratory Dalian China

ISBN: (纸本)9781728181905

Shallow sea reverberation is one of the main interferences in the active detection of underwater targets, and the working frequency of active sonar continues to expand to low frequencies, and the problem of reverberation interference is also receiving increasing attention. Focusing on the need to dig deeper into the frequency domain characteristics of shallow sea reverberation, this paper starts from the fluctuation characteristics of the low frequency reverberation spectrum in shallow seas, and uses spectral irregularity (SI) to characterize the spectrum fluctuations of the reverberation in shallow sea. First, based on the shallow sea reverberation point scattering model, the shallow sea reverberation is simulated. Combining with the definition of the spectrum irregularity value, the statistical results of the shallow sea reverberation spectrum irregularity value are studied, and the different pulse widths and different time periods of the multi-sample data are analyzed and compared. The results show that at the same transmitting frequency, when the pulse width of the transmitted signal increases, the SI value of the reverberation basically gradually decreases, and the SI value of the reverberation basically obeys the increase with the attenuation of the reverberation level. © 2021 IEEE.

关键词： Reverberation

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Jellyfish detection method based on high resolution multi beam acoustic imaging

Jellyfish detection method based on high resolution multi be...

引用

2021 International Conference on Computer Graphics, Artificial Intelligence, and Data Processing, ICCAID 2021

作者： Zhang, Jianfei Zhang, Xuegang Han, Jing Science and Technology on Underwater Test and Control Laboratory NO. 14 Binhai Street Zhongshan District Liaoning Dalian116013 China

ISBN: (数字)9781510652170

ISBN: (纸本)9781510652163

Aiming at the problem of jellyfish detection, a jellyfish detection method based on high-resolution multi beam acoustic imaging is proposed. The sea moon jellyfish detection experiments in real environment are carried out, and the individual echo characteristics of sea moon jellyfish are analyzed. The results show that the high-resolution multi beam acoustic method is effective to detect marine organisms at the outlet of nuclear power plant. © 2022 SPIE.

关键词： Marine biology

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引用

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

作者： Wang, Jingying Jia, Bing Zhang, Yang Wang, Rui Wu, Jianglin Wang, Zhizhuan Zhu, Yunfei Science and Technology on Underwater Test and Control Laboratory Dalian China

ISBN: (纸本)9781665432795

Target echo is the information source of active sonar, and the feature information of target echo highlight has important reference value for the detection and identification of active sonar system. According to the continuous acquisition of echo highlight at different azimuth angles, a bright spot sound image is formed in order to intuitively and effectively show the change rule of the target echo bright spot characteristics. In this paper, the target echo highlight-angle sound image simulation adopts the 1:20 scale Benchmark model, and use the image comparison method to compare the simulation results with the measured data. By comparing the results, it can be seen that under different signals and split angles, the two have a higher degree of similarity. And it is verified that the image contrast method in the research field of bright spot feature is effective. © 2021 IEEE

关键词： Sonar

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