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7th International Conference on Electronics technology, ICET 2024

作者： Zheng, Yi Yang, Xiangfeng Shi, Lei Yang, Yunchuan Science and Technology on Underwater Information and Control Laboratory Xi'an Precision Machinery Research Institute Xi'an China

ISBN: (纸本)9798350363951

How to prioritize observation targets when carrying out multi-target observation is an essential question for underwater mobile observation platforms. This problem can be solved by ranking the observation targets using the importance metric. With the knowledge of the target detection capabilities of underwater active acoustic homing detection devices, we first established a group of target value sequencing indexes based on the motion features of the targets and the correlation between the motions. Then, we designed a membership function to quantify each index, thus forming an underwater target value sequencing system. In addition, we designed a series of weight functions to form a variable weight vector for dynamic adjustment of the indexes in response to the change of situation and the change of indexes. The effectiveness of the proposed method is verified through a simulation experiment. The proposed method also yield good results under the data-missing condition, demonstrating that it is superior to the analytic hierarchy process in terms of robustness. © 2024 IEEE.

关键词： Membership functions

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Feasibility of low-intensity ultrasound treatment with hydroxylamine to accelerate the initiation of partial nitrification and allow operation under intermittent aeration

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Journal of Environmental sciences 2024年第5期139卷 446-459页

作者： Jianxiong Jian Xiaojian Liao Zhihua Mo Shoupeng Li Lei Li Shaojin Chen Zhenhua Huang Junhao Chen Wencan Dai Shuiyu Sun Guangzhou Key Laboratory Environmental Catalysis and Pollution Control Guangdong Key Laboratory of Environmental Catalysis and Health Risk ControlSchool of Environmental Science and EngineeringInstitute of Environmental Health and Pollution ControlGuangdong University of TechnologyGuangzhou 510006China Guangdong Province Solid Waste Recycling and Heavy Metal Pollution Control Engineering Technology Research Center Guangdong Polytechnic of Environmental Protection EngineeringFoshan 528216China Analysis and Test Center Guangdong University of TechnologyGuangzhou 510006China

Partial nitrification is a key aspect of efficient nitrogen removal,although practically it suf-fers from long start-up cycles and unstable long-term operational *** address these drawbacks,this study investigated the effect of low intensity ultrasound treatment combined with hydroxylamine(NH2OH)on the performance of partial *** showthat compared with the control group,low-intensity ultrasound treatment(0.10W/mL,15 min)combined with NH2OH(5 mg/L)reduced the time required for partial nitrification initiation by 6 days,increasing the nitrite accumulation rate(NAR)and ammonia nitro-gen removal rate(NRR)by 20.4% and 6.7%,respectively,achieving 96.48% ***-tic analysis showed that NH2OH enhanced ammonia oxidation,inhibited nitrite-oxidizing bacteria(NOB)activity and shortened the time required for partial nitrification ***,ultrasonication combined with NH2OH dosing stimulated EPS(extracellular polymeric substances)secretion,increased carbonyl,hydroxyl and amine functional group abundances and enhanced mass *** addition,16S rRNA gene sequencing results showed that ultrasonication-sensitive Nitrospira disappeared from the ultrasound+NH_(2)OH system,while Nitrosomonas gradually became the dominant ***,the results of this study provide valuable insight into the enhancement of partial nitrification start-up during the process of wastewater nitrogen removal.

关键词： Partial nitrification Low-intensity ultrasound Hydroxylamine Ammonia oxidizing bacteria Nitrite oxidizing bacteria

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Overview of underwater target feature extraction methods 6

Overview of underwater target feature extraction methods

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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...

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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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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 ...

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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...

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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...

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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...

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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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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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