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

共 193 条记录，以下是121-130 订阅

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Measurement and assessment method for ship radiating transient noise

Measurement and assessment method for ship radiating transie...

引用

2017 2nd International Conference on Automation,Mechanical control and Computational Engineering(AMCCE 2017)

作者： YU Tong-kui LIU Wen-shuai Shi Sheng-guo Long Jun College of Underwater Acoustic Engineering Harbin Engineering University Dalian Scientific Test and Control Technology Institute

To solve the assessment problem of underwater radiated noise under the typical transient condition for ship,time-frequency analysis,FIR filter and high-order static are combined based on the energy computation method of transient signal,and the advantage of each method are utilized to obtain the total energy and the characteristic frequency spectrum of transient *** comparison platform of transient noise under different conditions is established,so the assessment of ship radiated transient noise can be *** experiment is developed under the condition of anchoring at the sea,and the impulse signal and amplitude modulated single frequency signal are both *** established assessment method of transient signal are used to analyze the received transient noise,1/3 oct frequency spectrum of transient noise and its energy at the frequency range of 20 Hz0 k Hz are calculated,the difference between the energy of total frequency and actual amount of energy is less than 1 d *** mentioned above,this method possesses the important engineering application value for the measurement and assessment of ship radiated transient noise.

关键词： transient noise kurtosis statistics assessment method

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Rapid acquisition method of sea vessel radiating transient noise effective time based on the power-law

Rapid acquisition method of sea vessel radiating transient n...

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2017 the 2nd International Conference on Mechatronics Engineering and Information technology(ICMEIT 2017)

作者： Tongkui Yu Caogen Xiong Xiubo Wang Xuefeng Dai Tongjie Qin College of Underwater Acoustic Engineering Harbin Engineering University Dalian Scientific Test and Control Technology Institute

ISBN: (纸本)9781510840683

Ship transient noise generally has the characteristics of strong energy,short duration,and frequent appearance and so on,for sonar,these features not only affect their own working performance,but also are easily detected by enemy sonar,so,grasping the features and magnitude of underwater radiation noise will be conducive to the management work of guiding ship radiating transient *** order to effectively evaluate the acoustic features and magnitude of ship transient noise,accurately acquiring the beginning and end time is needed,some traditional transient signal detection methods can realize the extract of central moment,but the accuracy of extracting persistent time is poor,based on this reason,the paper uses power-law algorithm for transient signal waveform of the structure of the "sensitivity",combines with line-spectrum extraction technology and wavelet transform,gives full play to the advantages of the algorithm itself,to realizes rapid intercept of effective analysis time of ship transient noise,thus laying the foundation for characteristic analysis and level assessment of transient *** theoretical simulation result shows that this method can effectively eliminate the interference of steady state and background noise,and ensures the extraction of effective analysis time to transient *** conducting sea sound simulation experiment,using this method to analysis underwater radiation noise data,and the analysis result shows that this method can quickly and efficiently extract the beginning and end time of transient state noise,obtains the acoustic features and magnitude,and has a better engineering application value.

关键词： ships transient noise power-law significant moment wavelet transform

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Modulation feature of underwater target broadband echo spectrum

Modulation feature of underwater target broadband echo spect...

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IEEE International Conference on Signal Processing, Communications and Computing (ICSPCC)

作者： Chen-Yun Fei Li-Sheng Xia-Chun Yan Jia-Bing Li-Gui Juan Science and Technology on Underwater Test and Control Laboratory Dalian China School of Naval Architecture Dalian University of Technology Dalian China

Characteristics of elastic scattering wave depend on target elastic properties, the extraction of elastic wave characteristics is always difficult in underwater target detection by active sonar. Based on the modulation characteristics of broadband echo spectrum produced by target geometry scattering and elastic scattering, the modulation feature of echo spectrum was proposed and studied, expressing how underwater target properties effect on scattering wave spectrum. A sea testing of scaled benchmark and rock broadband acoustic scattering were conducted to verify the theoretical predication, which showed that targets of different properties could be well classified by the modulation feature of echo spectrum.

关键词： Benchmark testing Rocks Azimuth Scattering Frequency modulation Feature extraction

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Target spatial feature abstraction basing on beam forming

Target spatial feature abstraction basing on beam forming

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2016 IEEE/OES China Ocean Acoustics Symposium, COA 2016

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

ISBN: (纸本)9781467399784

underwater target recognition is very difficult because of the complexity of the ocean environment. The existing recognition technologies are mostly based on time domain, frequency domain, and time-frequency domain. Beam forming technology is a method of target recognition that has been researched and has developed rapidly in recent years. This paper applies beam forming and spatial spectrum analysis technology to an underwater echo signal in order to capture target echo and highlight spot and dimension features in the time-space domain. Image processing is used to extract the dimension and experimental data also verifies the feasibility of this method of beam forming. © 2016 IEEE.

关键词： Spectrum analysis

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An acoustic beacon detection system based on wavelet packet transform

An acoustic beacon detection system based on wavelet packet ...

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IEEE/OES China Ocean Acoustics (COA)

作者： Xiaoyuan Li Jiasheng Qu Wei Ba Dalian Scientific Test and Control Technology Institute China The Key Laboratory for Underwater Scientific Test and Control Technology Dalian China

ISBN: (纸本)9781467399791

The underwater acoustic beacon is one of the most commonly used ocean acoustic instruments. It is installed in the underwater carrier and transmits signals according to certain rules. In this paper, we introduce an underwater acoustic beacon detection system based on a wavelet packet transform. The system is composed of a ruggedized computer, a directional receiving transducer, an angle sensor, a detection bracket et al. The ruggedized computer is equipped with signal conditioning module, signal acquisition and processing module, and single board computer. In the signal acquisition and processing module, the wavelet packet transform and the traditional weak signal extraction method are used to extract and identify the signal which transmits from the acoustic beacon. The detection results are shown in the form of audio and video. This system is easy to operate. Meanwhile, using hardware broadband filtering and DSP module narrowband filtering, the system can realize multi-frequency detection of underwater acoustic beacons. Experimental results show that, because of the use of the wavelet packet transform, the detection distance can be increased by 20 percent as compared to a system using the matched filtering method.

关键词： Transforms Computers underwater cables Universal Serial Bus Connectors Matched filters

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A method of calculating propagation loss of sound wave in air from an underwater sound source

A method of calculating propagation loss of sound wave in ai...

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IEEE/OES China Ocean Acoustics (COA)

作者： Zuoxi Tian Kaina Jiang Science and Technology on Underwater Test and Control Laboratory Dalian China Dalian Scientific Test and Control Technology Institute China

In order accurately to calculate the transmission loss of sound waves in air from an underwater sound source, a sound propagation loss calculation model was established based on an underwater virtual sound source and geometrical acoustics. Viewed in the air, sound waves seem to spread from a virtual source located at a point underwater in the reverse extension line of the refracted sound rays. Thus the spreading loss of wave surface in the air should be calculated in accordance with the centre of the sphere at the place of virtual source. In the case of two very near sound rays emitted by the sound source, the reverse extension lines of their refracted sound rays necessarily intersect at the underwater virtual source. By finding the derivative of both sides of the Snell's law equation expressed by the product form, the derivatives of the incidence angle and the reflection angle in the relationship would be eliminated. It would then be able to determine the distance from the virtual source to the incident point and also the depth of the virtual source, which in turn would make it possible to calculate the sound transmission loss accurately in air. The measured and calculated values conform quite well, which indicates that the method is correct.

关键词： Microphones Propagation losses Sensitivity Transducers

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The influence of the seawater and seabed interface on the underwater low frequency electromagnetic field signatures

The influence of the seawater and seabed interface on the un...

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IEEE/OES China Ocean Acoustics (COA)

作者： Ruiyong Yue Ping Hu Jing Zhang Science and Technology on Underwater Test and Control Laboratory Dalian China Dalian Scientific Test and Control Technology Institute China

ISBN: (纸本)9781467399791

The seawater and seabed interface is the basic electric property interface of the shallow sea environment, and has a direct influence on the propagation and attenuation of the underwater low frequency electromagnetic field. It is necessary to analyze the influence of the electric property interface on the electromagnetic field in order to improve the measurement accuracy of marine underwater electromagnetic field tests and the performance of underwater electromagnetic communication. In this thesis, the physical mechanics of the interface influence is analyzed and interpreted by use of the interface influence factor on basis of the image method principle. The shallow sea is simplified as the air, seawater and seabed three layers homogeneous and isotropic conducting media model; and, the equation formula of electromagnetic field excited by the harmonic horizontal electric dipole in the seawater is presented. Through numerical testing, the spatial distribution and attenuation characters of the electromagnetic field excited by the harmonic horizontal electric dipole are investigated, and the influences of the interface on the electromagnetic signatures are analyzed quantitatively. The results show that the horizontal component amplitude of the underwater electric field increases and the vertical component amplitude decreases, apparently because of the high resistance property of the seabed. The transverse component amplitude of the underwater magnetic field is reduced and the vertical component amplitude is unchanged. The attenuation rate of the electric field horizontal component along the longitudinal direction with the interface is less than the attenuation rate without the interface. On the sea bed, the electromagnetic field attenuation rate decreases sharply with the decrease of seabed conductivity. On the basis of theory and numerical analysis, the influence model of the seawater and seabed interface is constructed by use of a curve fitting method. The research co

关键词： Attenuation measurement Reflection

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Study on line-spectrum stability of ship underwater radiated noise

Study on line-spectrum stability of ship underwater radiated...

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IEEE/OES China Ocean Acoustics (COA)

作者： Xuemeng Yang Lin Mu Yansen Liu Science and Technology on Underwater Test and Control Laboratory China Science and Technology on Underwater Test and Control Laboratory Dalian China

ISBN: (纸本)9781467399791

Ship radiated noise is usually comprised of continuously distributed broad-band noises and several narrow-band line spectrum components on discrete frequencies. Generated by periodical machinery rotation and propeller blade rotation, the line spectrum with high strength has its central frequency located in the low frequency range, so that its long-distance transmission loss is small. It is an important information source for passive target detection, tracing and recognition. Due to the comprehensive influence of sound source characteristics, transmission channels and Doppler phenomena, the magnitude and frequency of the line spectrum always fluctuates, which will definitely influence the performance of a sonar system. Addressing the problem, this paper proposes an analytical approach to evaluate the line spectrum stability of ship radiated noise. The validity of the method is checked by analyzing actually-measured radiated noise data of a ship at sea from the perspectives of magnitude and frequency. This research provides a new approach to improve the performance of line spectrum detection.

关键词： Marine vehicles Navigation Analytical models Propulsion Signal to noise ratio Fluctuations

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Target spatial feature abstraction basing on beam forming

Target spatial feature abstraction basing on beam forming

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IEEE/OES China Ocean Acoustics (COA)

作者： Zhaohui Zhang Chen Hu Yuan Peng Fengzhen Zhang Lin Mu Science and Technology on Underwater Test and Control Laboratory China Science and Technology on Underwater Test and Control Laboratory Dalian China

关键词： Array signal processing Time-domain analysis Image resolution Signal resolution Image reconstruction

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Study on modulation spectrum feature extraction of ship radiated noise based on auditory model

Study on modulation spectrum feature extraction of ship radi...

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IEEE/OES China Ocean Acoustics (COA)

作者： Lin Mu Yuan Peng Mengran Qiu Xuemeng Yang Chen Hu Fengzhen Zhang Science and Technology on Underwater Test and Control Laboratory China

ISBN: (纸本)9781467399791

Under the noise interference environment, the auditory system of the human ear boasts strong robustness and reliability. Integrate the auditory model of the human ear into the ship radiated noise modulation spectrum extraction process can further improve the signal to noise ratio (SNR) and enhance the effect of the extracted modulation spectrum. This paper simulates the processing mechanism of the cochlear and the practical characteristics of ship radiated noise signals according to the integrated Gammatone auditory filter and the Meddis internal hair cell model, and it builds a Gamatone-Meddis auditory periphery model that is suitable for ship radiated noise signals. Then, the ship radiated noise signals are processed by the Gammatone-Meddis auditory model, the low-pass filtering (LPF), the Fast Fourier transform (FFT) and the multi-band integration in order to obtain an improved auditory spectrum extraction technique. The simulation results have verified that the Gammatone-Meddis model can extract modulation information well. After applying the method to a test of practical ship radiated noise signals, the author finds that the extraction method presented in this paper can obtain an obvious modulation spectrum at low SNR, and has a great advantage over the traditional modulation spectrum extraction methods.

关键词： Frequency modulation Time-frequency analysis Acoustics Character recognition Reliability Propulsion

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