水下无人系统学报

Research Status and Development Trend of Bionic Underwater Vehicle

LI Cheng-Jin

2016, 24(1): 001-7. doi: 10.11993/j.issn.1673-1948.2016.01.001

[Abstract](1372) [PDF 985KB](1390)

Abstract:
Bionic underwater vehicle is drawing more and more attention due to its low power consumption, low noise, high propulsion efficiency, and flexible maneuver. This paper introduces the bionic underwater vehicle in respect to propulsion mode and propulsion mechanism, and introduces the current research situation of 7 kinds of bionic underwater vehicles. Comparative analysis is performed, and several problems in current researches are revealed. In addition, some key technologies and development trend of bionic underwater vehicle are discussed in terms of propulsion, control, power, communication, etc.

Multi-level Fuzzy Comprehensive Evaluation for Maneuverability of Low Speed Variant Mass Underwater Vehicle

ZHOU Jun, ZHANG Yan

2016, 24(1): 008-12. doi: 10.11993/j.issn.1673-1948.2016.01.002

[Abstract](1093) [PDF 253KB](337)

Abstract:
A maneuverability evaluation method of low speed variant mass underwater vehicle, named multi-level fuzzy comprehensive evaluation, is proposed based on the evaluation of submarine maneuverability and the characteristic analysis of low speed variant mass underwater vehicle. Evaluation factor sets are established by selecting the performance indexes with significant effects on the low speed variant mass underwater vehicle, the matrix of the evaluation factor sets are calculated via the membership function with ridge-shape distribution, and the weight sets of the evaluation factor sets are determined by using fuzzy analytical hierarchy process to obtain the fuzzy evaluation results of maneuverability. The proposed multi-level fuzzy comprehensive evaluation method can be used for quantitative analysis on maneuverability of low speed variant mass underwater vehicle, and the analysis results are reliable for engineer application.

Vibration Transfer Optimization of Torpedo Based on Workbench Response Spectrum

WANG Lu, YIN Shao-ping, CAO Xiao-juan, GUO Jun, HAO Dong-xu

2016, 24(1): 013-17. doi: 10.11993/j.issn.1673-1948.2016.01.003

[Abstract](1154) [PDF 925KB](853)

Abstract:
For reducing structural vibration transfer response and optimizing design parameters in the scheme design phase of a torpedo, finite element analysis is employed to establish a parameterized equivalent model of torpedo structure based on Workbench. Response spectrum analysis is conducted for the shell of a certain type torpedo. The design parameters, like equivalent concentration of mass, shell thickness, and size of reinforcing rib with rectangular cross section, are optimized to reduce the vibration transfer response. Simulation results show that this parameterized equivalent model can effectively simulate the characteristic of structural vibration transfer of a torpedo, and the vibration transfer response of the homing head cabin decreases after optimization.

Effects of Mechanical Seal Parameters of Torpedo Tail Shaft on Leakage Rate

ZHAN Mao-rong, WANG Zhi-jie, CAO Xiao-juan, XU Xin-dong, GUO Jun, SHAN Zhi-xiong

2016, 24(1): 018-22. doi: 10.11993/j.issn.1673-1948.2016.01.004

[Abstract](1111) [PDF 319KB](555)

Abstract:
This paper establishes a mechanical seal leakage model of torpedo tail shaft, and analyzes the effects of fractal dimension, width of static ring, and spring pressure on leakage rate in order to determine design parameters of torpedo tail shaft seal leakage rate. In the condition of meeting the requirement of no leakage, this paper optimizes the parameters by using genetic algorithm in the specific conditions. The results show that the leakage rate is lower than 3mL/h in the specific navigation condition of a torpedo when the width of static ring, spring pressure and fractal dimension are in optimum combination.

Current Situation and Prospect on Torpedo′s True/False Target Identification Technologies

HE Xin-yi, GAO He, CHEN Jing, CHENG Shan-zheng

2016, 24(1): 023-27. doi: 10.11993/j.issn.1673-1948.2016.01.005

[Abstract](910) [PDF 272KB](715)

Abstract:
The identification ability of a torpedo for true/false targets determines its penetration ability. In this paper, the torpedo guidance characteristics are summarized, and the existing torpedo′s true/false target identification technologies are divided into three categories according to the mechanisms: 1) the true/false target identification technology based on the distance, bearing and frequency gating of a target; 2) the true/false target identification technology based on the scale feature of a target; 3) the true/false target identification technology based on the radiation noise level and spectral characteristics within a torpedo′s homing frequency band. The principles and features of these three categories of torpedo′s true/false identification technologies are discussed. Moreover, according to the operational requirements for a torpedo and the development of target feature-based torpedo homing technology, the development trend of torpedo′s true/false target identification technology is prospected in such aspects as the acoustic characteristics in vertical direction of target and acoustic imaging.

Radiation Sound Field Reconstruction Based on Modal Superposition Method and Experiment

QI Qian, CHEN Hang, YANG Hu

2016, 24(1): 028-32. doi: 10.11993/j.issn.1673-1948.2016.01.006

[Abstract](785) [PDF 783KB](386)

Abstract:
Location identification of radiation sound source is the most effective and direct means to improve the stealth of the underwater weapons. Sound radiation modal and sound field distribution can reflect the radiation characteristics of the sound source. In this study, radiation sound field reconstruction of a simply supported panel was conducted based on the modal superposition method. According to the free vibration differential equation of the simply supported panel, the natural frequencies and vibration differential modal function were obtained, and the radiation sound field of the simply supported panel was acquired by using the sound modal superposition method. Then, a radiation sound field reconstruction experiment was conducted based on the near-field acoustic holography(NAH) sound field reconstruction model, and the radiation characteristics of the simply supported panel reconstruction surface were obtained. Experimental results were compared with the theoretical value. The reconstructed sound pressure is consistent with the theoretical one, which verifies the effectiveness of the proposed radiation sound field reconstruction method based on modal superposition method.

Underwater Target Localization and District Control Based on Cross-Spectrum Method

XIA Qing-sheng

2016, 24(1): 033-36. doi: 10.11993/j.issn.1673-1948.2015.06.007

[Abstract](1182) [PDF 511KB](424)

Abstract:
A passive acoustic localization method and a district control method are proposed based on cross-spectrum time-delay estimation method and principle of triangulation localization in order to effectively detect an underwater target and accurately estimate its direction under long distance and low signal-to-noise ratio(SNR), and are verified by simulation, anechoic tank test and the data of real ship. The results show that the proposed methods are simple and operable, and have a good engineering application prospects.

Current Situation and Development of Torpedo Warhead Power Assessment Technology

DING Zhen-dong, WANG Tuan-meng

2016, 24(1): 037-42. doi: 10.11993/j.issn.1673-1948.2016.01.008

[Abstract](1408) [PDF 281KB](816)

Abstract:
This paper comprehensively analyzes the present situation and assessment methods of torpedo warhead power both at home and abroad with respect to the particularity of torpedo warhead power assessment. Some suggestions are put forward aiming at such problems existing in power parameters transformation of torpedo warhead, information database establishment, soft-killing, power assessment index, power evaluation criterion, etc. as well as the problem that the combination of damage power of torpedo warhead and target vulnerability is insufficient in research. The emphases and development trends of torpedo warhead power assessment in China are discussed in this paper.

Research on Explosion Power Indexes System for Anti-ship Torpedo

LI Hong-tao, GAO Shun-lin, XI Hui-wei, JIANG Wen-cong

2016, 24(1): 043-47. doi: 10.11993/j.issn.1673-1948.2016.01.009

[Abstract](1478) [PDF 329KB](577)

Abstract:
The damage effect of an anti-ship torpedo on a target depends on its warhead explosion power, torpedo and target encounter condition, and target vulnerability. This paper analyzes the damage mechanism for an anti-ship torpedo, and introduces four characterization parameters of torpedo warhead explosion power used in engineering design and operational application, i.e. shell damage length, shock wave pressure, damage radius, and explosion energy. Furthermore, this paper analyzes the main factors influencing the explosion power, and establishes an explosion power indexes system of an anti-ship torpedo. This research may provide a reference for warhead power design, actual power estimation, and test evaluation, etc.

Simulation of Fuel Suction Characteristics of Fuel Pump Based on AMESim

ZHANG Hua-yi, PENG Bo, YANG Cheng-shi, ZHANG Xiao-yi, YANG Yu-jing

2016, 24(1): 048-52. doi: 10.11993/j.issn.1673-1948.2016.01.010

[Abstract](971) [PDF 463KB](502)

Abstract:
In order to study fuel suction characteristics of a fuel pump, a simulation model of a fuel pump is established by the software AMESim. Taking a fuel pump of an underwater vehicle for example to conduct simulation, the results accord with the experimental data. Based on the simulation results, the influences of inlet pressure and rotational speed on inlet flow rate are analyzed, and the critical relation between inlet pressure and rotational speed is achieved with genetic algorithm taking no air release in the piston chamber as an objective function. Simulation results show that the pressure in cylinder chamber approaches the minimum at about 270° of rotational angle, where the piston is in medium of fuel suction process; and if the inlet pressure is lower or rotational speed is higher than their critical values, the minimum pressure in piston chamber gets lower than the separation pressure of air, as a result, fuel releases air to generate cavitation, hence the inlet flow rate becomes significantly lower than the theoretical value.

Optimization Design of Inverter Bridge Snubber Circuit

ZHOU Guo-ming, WANG Jian-ping

2016, 24(1): 053-59. doi: 10.11993/j.issn.1673-1948.2016.01.011

[Abstract](1124) [PDF 392KB](742)

Abstract:
One of the key links in power system design of an electric power torpedo is the design of inverter circuit by using power semiconductor devices to form inverter bridge. This device will be subject to sharp variations of current and voltage as well as current and voltage spikes at its ‘turning on’ or ‘turning off’ moment. If these parameters beyond the safe operating area of the device, damage would occur, so it is necessary to design a snubber circuit. This paper analyzes the turning on or turning off process of an insulated gate bipolar transistor(IGBT) , compares different applications of snubber circuits with different structures, and discusses the advantages and disadvantages of the snubber circuits. Comparative analysis and theoretical derivation are performed for different inverter bridge snubber circuits, and simulation is conducted. Simulation result shows that the resistance capacitance diode(RCD)-type snubber circuit has the ability of strong suppression to turning-off surge voltage, and has low switching loss. It is hence suggested that the RCD-type snubber circuit be selected in design of high power high frequency power electronic system.

Test Scheme of Submarine-launched Wire-Guided Torpedo Attacking Evasive Maneuver Surface Ship

WANG Hao, XIE Yong

2016, 24(1): 060-65. doi: 10.11993/j.issn.1673-1948.2016.01.012

[Abstract](751) [PDF 322KB](412)

Abstract:
Considering operational application of a surface ship in elusive maneuver to defense against a subma-rine-launched wire guided torpedo, the surface ship′s elusive maneuver strategy and the effect of the surface ship on torpedo′s operational application are summarized. On the basis of the torpedo approval test, a test scheme of a wire-guided torpedo attacking a surface ship in elusive maneuver is put forward, and simulation is carried out. Simulation and calculation results of torpedo operational effectiveness proves that elusive maneuver way of a surface ship has a significant influence on the wire-guided torpedo′s operational application, and that the test scheme is feasible and necessary.

Criterion and Strategy of Torpedo Trajectory for Protecting Underwater Launch Platform

JIANG Chan-zhi, ZHANG Hong, HU Jun

2016, 24(1): 066-69. doi: 10.11993/j.issn.1673-1948.2016.01.013

[Abstract](666) [PDF 215KB](370)

Abstract:
The increase of torpedo range and the significant enlargement of torpedo detection zone resulted from complex countermeasure promote the probability of a torpedo to search and track the launch platform. This paper studies the design scheme of torpedo trajectory to protect underwater launch platform, and proposes a judgment algorithm for determining whether a torpedo can discover the platform and a maneuver strategy for the platform as it is about to be found by a torpedo. How a torpedo acquires location information of the launch platform is analyzed, subsequently a judge model and an elusion model are established, and corresponding engineering realization method is offered. This scheme is simple and accurate, and no emergent braking is needed for elusion in any case. Hence this scheme can avoid the waste of torpedo sinking, and can attack target by utilizing follow-up information.

Finite Element Analysis of New Buffer Mechanism for Torpedo Launch System

WANG Xian-ming, LI Kai-fu, DUAN Hao, WANG Yun

2016, 24(1): 070-75. doi: 10.11993/j.issn.1673-1948.2016.01.014

[Abstract](1285) [PDF 1226KB](442)

Abstract:
Considering the serious impact and vibration of a gas-water cylinder during launching process of a torpedo or a missile by torpedo launcher, a new type of rubber buffer mechanism is designed with combination of copper cushion and rubber to improve the existing copper cushion buffer mechanism. Because rubber is a viscoelastic material, the rubber related theory is used to analyze the nonlinear characteristics of the rubber, and a contact-type rubber finite element model is established. The stress, deformation and contact reaction force of the rubber with different lengths are analyzed, and its buffering effect is compared with that of the existing copper cushion by taking work as the evaluation index. The simulation results show that the new buffer mechanism is better than old one, and the buffering effect is optimum when rubber length is 27 mm under certain conditions.

Design and Implementation of a Setting Transponder for Torpedo Launch Training System

ZHAO Jin-hong, YANG Meng, WANG Qin-juan

2016, 24(1): 076-80. doi: 10.11993/j.issn.1673-1948.2016.01.015

[Abstract](753) [PDF 223KB](408)

Abstract:
A design scheme of setting transponder for torpedo launch training system was proposed, and its effectiveness and feasibility were verified by experiment. The scheme has the advantages such as accurate simulation, simple operation, high reliability and small size, and may provide a reference for design of other setting transponders. Application of this scheme to simulation training system can save training cost, and can significantly increase the chance of training at low cost to promote rapid formation of fighting force for new equipment.

2016 Vol. 24, No. 1

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