水下无人系统学报

Anti-submarine Warfare(ASW) Weapons and Sub-to-air Missile with Influences on Future ASW

QIAN Dong, SUN Zheng-jie

2008, 16(6): 001-9. doi: 10.11993/j.issn.1673-1948.2008.06.001

[Abstract](2224) [PDF 1247KB](952)

Abstract:
The development of the weapons, such as sub-to-air missile, anti-submarine rocket(ASROC), etc., are reviewed. The interactive defense and attack system for submarines (IDAS) missile, P-8 multimission maritime aircraft(MMA), high altitude anti-submarine warfare weapon concept(HAAWC), and vertical launch ASROC-ER are described. Their influences on future anti-submarine warfare(ASW) are analyzed. It is pointed out that the long shot ASW weapons are the result of net-centric ASW concept. In the future, Submarine will face the new threats of unmanned distributed networked sensor field (UDNS) , global maritime surveillance unmanned aerial vehicle(UAV) system, and HAAWC, etc. Thus the countermeasure manner will change greatly.

Current Situation and Development Trend of AUV Recovery Technology

PAN Guang, HUANG Ming-ming, SONG Bao-wei, HU Hai-bao, DU Xiao-xu

2008, 16(6): 010-14. doi: 10.11993/j.issn.1673-1948.2008.06.002

[Abstract](2523) [PDF 618KB](1056)

Abstract:
The current situation of autonomous underwater vehicle(AUV) recovery technologies is elaborated. The technical difficulties and theory of the new autonomous recovery technology are analyzed, including dynamics, control, and navigation, etc., and some corresponding resolvents are introduced. Finally, the development trend of AUV recovery technology is discussed.

Discussion on Informatized Test Technical System of Naval Military Equipment

ZHOU Hua, SUN Shu-ri, ZHANG Shu-hong, LI Chen

2008, 16(6): 015-19. doi: 10.11993/j.issn.1673-1948.2008.06.003

[Abstract](1497) [PDF 735KB](631)

Abstract:
Future informatization warfare of navy force demands a large number of informatized equipments, which results in new requirements for the equipment test. To update test technical system and build informatized test range, we discuss the establishment of informatized test technical system for naval military equipment, present an idea of multi-sensor information fusing based on network environment, and propose a concept for realizing the unidirectional transparentness of the test using multi-dimensional sensing systems, and establish a dynamic equation of the "quantized" equipment test system.

Technique of Uncapping System of Box Ring-Like Pressure Mine Girder for Sail Mine

GU Jun

2008, 16(6): 020-23. doi: 10.11993/j.issn.1673-1948.2008.06.004

[Abstract](1424) [PDF 622KB](621)

Abstract:
To meet the structure and launch requirements of deep autonomous attack mine, a technique of uncapping system of box ring-like pressure mine girder for sail mine is presented. The composition, function and characteristic of uncapping system are described, and the critical parts of the system are analyzed and calculated by using finite element method. The related action process of the spread of ring-like pressure mine girder and the motion of sail mine is analyzed with simulation interference. Theoretical calculation and simulation interference analysis show that the system can solve four actual problems and meet operational requirement.

Application and Development of Vibration and Noise Suppression Technology for Torpedo

LIU Kai, ZHU Shi-jian, DING Shao-chun

2008, 16(6): 024-27. doi: 10.11993/j.issn.1673-1948.2008.06.005

[Abstract](1540) [PDF 541KB](712)

Abstract:
The vibration and noise suppression technologies of torpedo have been developed rapidly in recent years, acoustic stealth has hence become an important item in modern torpedo specification. This paper analyzes the effect of acoustic stealth on the overall performance of a torpedo, and summarizes the development of vibration and noise suppression technologies of torpedo. Some methods are presented to suppress the hydrodynamic noise, propelling noise, and mechanical noise based on the analysis of the main noise sources of a torpedo. Moreover, some vibration and noise suppression schemes for floating raft, shafting, pipeline, and gear of a torpedo are proposed according to the characteristics of the power system.

Testing System for AUV Based on Systematic Method

WANG Jin-hua, YAN Wei-sheng, GUI Zhi-hui, MA Wen-jie

2008, 16(6): 028-33. doi: 10.11993/j.issn.1673-1948.2008.06.006

[Abstract](1673) [PDF 685KB](760)

Abstract:
A new testing system for autonomous underwater vehicle(AUV) is presented based on the concept of open complex giant system and the system methodology. The testing system is a real time hardware-in-loop simulation system for demonstration of the architecture, formation control and coordination of AUV, which would play an important role in AUV research and development. The whole frame and model of the testing system based on Web are proposed, and the real time simulation module of AUV is analyzed. This testing system may provide an effective way to improve AUV′s security, reduce test cost, and shorten research and development period.

Sensor Fault Diagnosis and Fault-Tolerant Control Base on Two-level Neural Network

GAO Li-e , LIU Wei-dongGAO, ZHANG Ping, ZHANG Sen

2008, 16(6): 034-37. doi: 10.11993/j.issn.1673-1948.2008.06.007

[Abstract](1771) [PDF 453KB](736)

Abstract:
This paper presents a structure of two-level neural network which consists of a main neural network and some sub neural networks. The main neural network is used to detect sensor faults, and the sub neural networks are used to locate the fault sensors and recover their signals. Based on the analytical redundancy technology, the sensors in the control system of underwater vehicle and their analytical relations are analyzed, and the active fault-tolerant approach of the two-level neural network for the control system is investigated and simulated. The simulation results show that the presented approach is effective in sensors fault detection and active fault-tolerant control.

Feature Extraction Model for Underwater Target Radiated Noise

HU Qiao, HAO Bao-an, LV Lin-xia, CHEN Ya-lin, SUN Qi

2008, 16(6): 038-43. doi: 10.11993/j.issn.1673-1948.2008.06.008

[Abstract](1935) [PDF 641KB](722)

Abstract:
Due to the difficulty of correctly extracting the features of underwater target radiated noise in complicated environment, a novel feature extraction model for underwater target radiated noise (UTRN) was proposed based on second generation wavelet transform (SGWT), improved empirical mode decomposition (EMD) and Hilbert envelope spectrum analysis (HESA). Firstly, the nonstationary UTRN was filtered via SGWT to remove the noise components. Secondly, with the improved EMD, the filtered UTRN was decomposed to obtain the intrinsic mode functions (IMFs). Finally, the features of UTRN could be extracted by HESA of the IMFs. This proposed model was applied to the feature extraction of simulation signal and real radiated-noise data of underwater targets, and the results show that this model can more effectively extract the features from the radiated noise data, compared with the conventional wavelet filtration and HESA.

Finite Element Analysis of Free-flooded Segmented Ring Transducer

TENG Duo, CHEN Hang, ZHU Ning, ZHU Guo-lei

2008, 16(6): 044-47. doi: 10.11993/j.issn.1673-1948.2008.06.009

[Abstract](2354) [PDF 534KB](666)

Abstract:
The frequency equations about two resonances of free-flooded segmented ring transducer are obtained via traditional analytic method, and then a circumferential symmetry finite element model of the free-flooded segmented ring transducer is established. The two resonances and the vibration performance of the transducer are predicted through ANSYS, and a prototype of the free-flooded ring transducer is designed. The anechoic tank test for the prototype shows that the finite element method(FEM) is suitable for analyzing the cavity resonant performance of the free-flooded ring and the radial resonant performance of the segmented ring transducer, and the design error about resonant frequency can be controlled within 5%.A final transducer prototype based on the above research achieves the cavity resonance of 2.35 kHz, the radial resonance of 6.4 kHz, the maximum transmit voltage response level of 141.97 dB, the radial resonant 6 dB bandwidth of 3.9 to 9.4 kHz, and the overall available bandwidth (including the cavity resonance) of 2.1 to 10 kHz ±4 dB.

Direction of Arrival(DOA) Estimation of Multiple Sources in the Air Using Small-aperture Arrays

SU Shuai, WANG Xiu-xiu, SUN Chao

2008, 16(6): 049-53. doi: 10.11993/j.issn.1673-1948.2008.06.010

[Abstract](1932) [PDF 566KB](776)

Abstract:
A method of direction of arrival (DOA) estimation for multiple sources using a small aperture array is presented. Firstly, four beams are formed using wideband distortionless beamforming method, which divides the whole space into four separated regions. Then the beam outputs are calculated and taken as the signal received by a reference point. Finally, time delays between the signal received by the reference point and each element of the array are estimated by the generalized correlation method, thus the sources in each region can be localized by the time delay-based DOA estimation method. The effectiveness of the proposed method is verified by computer simulations.

Power Calculation of Gas Turbine Based on the Computational Fluid Dynamics(CFD) Method for Torpedo

DU Zhi-guo, PENG Bo, NIE Wei-dong

2008, 16(6): 054-57. doi: 10.11993/j.issn.1673-1948.2008.06.011

[Abstract](1573) [PDF 508KB](670)

Abstract:
Power calculation of gas turbine is commonly conducted using one-dimensional analytical method and empirical formula, where the loss in flow part is ignored, and further optimization of performance parameter of the turbine is difficult. We numerically simulated the three-dimensional flow field of a gas turbine for torpedo by using computational fluid dynamics(CFD) method, and analyzed and post-processed the simulation results. The total torque values of the impeller and blade of the turbine were therefore obtained, and the output power of the turbine shaft was deduced. Our results could be used for analyzing internal loss and optimizing performance parameters for the turbine.

Simulation of Fire Position for Wire Guiding and Wake Homing Torpedo

JIANG Xian-fen, ZHANG Jing-yuan, LIU Wen-yuan

2008, 16(6): 058-63. doi: 10.11993/j.issn.1673-1948.2008.06.012

[Abstract](1898) [PDF 565KB](678)

Abstract:
To improve hit probability, a wire guiding and wake homing torpedo needs to enter the target wake with a proper angle. This paper simulates a wire guiding torpedo using the current azimuth guidance method. Based on the simulation result, it discusses the relation between the angle of entering wake and initial angle of enemy board, initial launch range or target velocity, and analyzes quantitatively the influences of the above factors on the entry angle. According to the probability of a wire guiding torpedo entering target wake, effective fire position is obtained and compared with that from the ahead point guidance method, and the effect of fire position on torpedo attack is analyzed.

Analysis of Torpedo Countermeasure Trajectory Against Noise Jammer Based on Uniform Design

CHU Lei, ZHOU Ming, XU Jing, LIN Zong-xiang

2008, 16(6): 064-67. doi: 10.11993/j.issn.1673-1948.2008.06.013

[Abstract](1992) [PDF 447KB](661)

Abstract:
By analyzing the mechanism of noise jammer, we design a simulation test for torpedo attack, conduct a regression analysis for test result, and obtain a regression forecast formula of hit probability to calculate and set trajectory parameters for different simulations. Moreover, we obtain the optimized trajectory parameters against noise jammer using nonlinear programming to improve torpedo hit probability and acoustic counter-countermeasure(ACCM) effectiveness.

2008 Vol. 16, No. 6

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