水下无人系统学报

Torpedo Overall Design Technology Based on Modularization

LI Ming-kun, CAO Xiao-juan, WANG Zhong, ZHANG Bo, NIE Wei-dong, MA Ling

2016, 24(4): 241-248. doi: 10.11993/j.issn.1673-1948.2016.04.001

[Abstract](1472) [PDF 845KB](1136)

Abstract:
In view of the problems in traditional torpedo overall design, such as the high design & development cost, the low reliability and the low reuse rate of mature technology, a rapid torpedo overall design method based on modularization is proposed through getting the inspiration from development process and specifications of DM2A4 and MK54 torpedoes, and analyzing the strategies of torpedo modular design with respect to engineering practice. The design flow and the key technologies are discussed in detail. This design method is on the basis of construction of a resource management platform, and manages effectively the design resources of mature types. According to operational requirements, specifications are searched to determine the most optimal similar type on the design resource management platform, then to modify the different modules and form the overall technical scheme of a torpedo. The method can reduce the cost effectively by achieving the maximum reuse of design resource of mature type.

Aging Test and Storage Life Prediction for the Seal of Torpedo Stern Shaft

YANG Xia-hui, LI Zhi-yu, WANG Xin

2016, 24(4): 248-254. doi: 10.11993/j.issn.1673-1948.2016.04.002

[Abstract](1274) [PDF 548KB](463)

Abstract:
Accelerated aging test for a certain type of torpedo stern shaft seal was conducted at different high temperature to measure its break elongation rate, residual compression deformation, internal and external diameter residual deformations, and air tightness. The dynamic attenuation equation and the Arrhenius formula were employed to describe the accelerated aging test, and the extrapolation method was adopted to estimate the storage life of the seal. The results show that: 1) the storage life of the seal is 22.55 and 21.69 years if the requirements of break elongation rate and residual compression deformation are met, respectively; 2) the storage life is 5.17 and 9.68 years if the requirements of the internal and external diameter residual deformations of the sealing cup are met; 3) the internal diameter residual deformation of the sealing cup is the key factor influencing sealing cup life; and 4) the storage life prediction of the torpedo stern shaft seal is 5.17 years, meeting the designed value.

Simulation of Submarine Target Strength Forecast Based on Improved Planar Element Method

SUN Nai-wei, LI Jian-chen, WAN Ya-min, ZHAO Gang, LÜ Wei, FAN Ruo-nan

2016, 24(4): 254-260. doi: 10.11993/j.issn.1673-1948.2016.04.003

[Abstract](1064) [PDF 583KB](484)

Abstract:
Aiming at the instability in computing submarine target strength with the planar element method in case the integral denominator is zero, Gordon integral algorithm is used for submarine target strength forecast, and the process of planar occlusion judgment for complicated target is simplified. Firstly, a rigid sphere is modeled. Then, a 3D model of Benchmark submarine and a forecast model of submarine target strength based on the improved planar element method are built to forecast submarine target strength. Simulation results show that the proposed forecast model gains more stable computation, and the obtained data can well reflect the features of submarine target strength.

Noise Analysis on Torpedo Homing System with Countermeasures

TIAN Feng-hua, SONG Zhe, ZHANG Kui, WANG Tao, ZHOU Xiao-bo

2016, 24(4): 260-267. doi: 10.11993/j.issn.1673-1948.2016.04.004

[Abstract](1313) [PDF 487KB](1194)

Abstract:
To improve the overall performance of low-frequency broadband homing system in complex environment, a self-noise technology system of torpedo homing system is established considering the self-noise characteristic of torpedo homing system. The electronic equipment noise, acoustic device magnetic radiation noise, thermal noise, flow noise and structure vibration noise are investigated. The vibration isolation materials and structure designs of high-damping array shell and acoustic array are studied. The influence of flow noise on homing reception performance of torpedo homing system is analyzed. In addition, countermeasures against the vibration and noise reduction of torpedo homing system are offered. This research may provide a reference for design of torpedo homing system with low noise level.

Application of Multi-Sensor Information Fusion Based on Wavelet Neural Network to Depth Measurement for AUV

WU Ya-jun, MAO Zhao-yong

2016, 24(4): 267-271. doi: 10.11993/j.issn.1673-1948.2016.03.005

[Abstract](1087) [PDF 421KB](601)

Abstract:
To consider the influences of internal ambient temperature, current and other factors on the measurement accuracy of an autonomous underwater vehicle(AUV) depth sensor, a compact type depth measurement model is estab-lished by means of the wavelet neural network based multi-sensor information fusion technology. This model fuses the sample information of temperature, current and depth sensors. The gradient based learning algorithm is adopted to solve the model. Experimental results show that the measurement error of the depth sensor is significantly reduced after wavelet neural network based information fusion, and the influences of the disturbing factors, such as internal ambient temperature and current, on the depth sensor are eliminated. It is concluded that wavelet neural network can be used in the information fusion of AUV depth sensor to effectively improve the performance of the depth sensor.

Development of Data Management Software for Torpedo Power Test

CHEN Li-shan, SUN Tao, LIU Pei-pei, GAO Hui-zhong

2016, 24(4): 271-277. doi: 10.11993/j.issn.1673-1948.2016.04.006

[Abstract](1239) [PDF 630KB](451)

Abstract:
At present, data analysis systems usually use folder to store test data, but this manner is insufficient for data management and spends more time in data acquisition, analysis and access. Therefore, a data management software for torpedo power test is developed based on LabVIEW and Access to improve information interaction among modules in the acquisition and analysis software. In Access a database model and the relationship among datasheets are designed, and in LabVIEW database maintenance tool and interface program between database and function modules are developed. Thus query, modification, deletion, and data input/output operations on datasheets are implemented with higher efficiency.

Theoretical and Simulation Study on Output Torque of Counter-rotating Turbine for Underwater Vehicle

WANG Xin-ping, DANG Jian-jun, LIU Cheng-yong

2016, 24(4): 277-283. doi: 10.11993/j.issn.1673-1948.2016.04.007

[Abstract](948) [PDF 609KB](803)

Abstract:
A new parameter design of counter-rotating turbine engine for an underwater vehicle is presented. The structure characteristics of counter-rotating turbine are analyzed to derive mathematical expressions of effective output torque for the first-stage and the second-stage turbines. Three working modes with different velocities are designed for an underwater vehicle. The nozzles and the first-stage turbine are designed based on the medium velocity mode, while the second-stage turbine is designed based on the highest velocity mode. Furthermore, a model of counter-rotating turbine engine is built to simulate the flow fields for the three working conditions. Comparison between the theoretical calculation results and the simulation results indicates that substitution of the counter-rotating turbine for the conventional turbine can reduce the residual velocity loss and improve the efficiency of the turbine engine, suggesting the correctness and feasibility of the proposed method.

Function Design and Implementation of Power Test Data Analysis System Based on LabVIEW

GAO Hui-zhong, SUN Tao, CHEN Li-shan, LIU Pei-pei

2016, 24(4): 283-289. doi: 10.11993/j.issn.1673-1948.2016.04.008

[Abstract](1341) [PDF 469KB](507)

Abstract:
For torpedo power test, because of complex structure, multiple key parameters and long testing time of the tested object, the analysis of test data demands stricter environment condition. In order to effectively eliminate the disadvantages of general analysis software in dealing with the multi-channel data, a torpedo power test data processing system is compiled, which takes the balance between development cost and efficiency into account. Considering the characteristics of power section test, MATLAB hybrid programming technology is adopted to develop double coordinates and normalized display function in LabVIEW, thus the read effect of multi-channel data is significantly improved. Finally, the system performance is tested by actual test data, and the result shows that the system meets the design and engineering requirements with effectiveness and stability.

Operational Application Methods of Underwater Weapon Based on Underwater Information System

DONG Chun-peng

2016, 24(4): 289-294. doi: 10.11993/j.issn.1673-1948.2016.04.009

[Abstract](1394) [PDF 231KB](666)

Abstract:
Current development of underwater warfare is toward the network-based informationization. The underwater informationized operational system integrating underwater weapon and underwater information system can share battlefield information and make quick response to improve the efficiency of cooperative operation. Aiming at the characteristics of underwater weapon, this paper introduces the development of underwater informationized operational system in foreign countries, and proposes several operational modes of the underwater weapon based on independent underwater information system or embedded underwater information system. It is concluded that the underwater weapon based on underwater information system has the advantages of diverse operational modes, broad sea area in control, rapid operational response, and secure operational platform. This research may provide a basis for development of related equipment and for construction of ever-perfect underwater information operation system.

Technical Requirements and Feasible Implementation Method for Exercise Torpedo Training in the Open Sea

LIU Hai-guang, LI Wei, WANG Gui-qin

2016, 24(4): 294-299. doi: 10.11993/j.issn.1673-1948.2016.04.0010

[Abstract](1097) [PDF 241KB](590)

Abstract:
For torpedo training in the open sea, potential problems and technical requirements of exercise torpedo in actual training in the open sea are analyzed according to the current exercise torpedo technology and the features of marine environment in the open sea. Principal method for solving those problems is discussed from technical aspect of torpedo. The ideas about the feasible techniques for meeting the requirements of exercise torpedo training in the open sea are presented, such as power adaptability, recycle-free self-sinking, back transmission of data, and information self-destruction. This research may provide a reference for development of torpedo equipment, and for promoting reasonable application of weapons to raise training level.

Assessment Method of Loading Reliability for Shipborne Depth Charge

MA Hao-wen, TIAN Shu-dong

2016, 24(4): 299-304. doi: 10.11993/j.issn.1673-1948.2016.04.011

[Abstract](990) [PDF 258KB](340)

Abstract:
Aiming at the problem that the assessment of loading reliability is insufficient in shipborne depth charge evaluation test, the factors of warship environment influencing shipborne depth charge are analyzed, and the boundary condition of environment test is discussed. Then, a new assessment method via simulating the warship environment test platform is presented to solve the problems that the testing condition is limited, the warship support is difficult to be implemented, and the assessment is insufficient. This study may provide theoretical basis for support capability construction of range test and evaluation test.

Background Construction and Scheme Design for Anti-torpedo Torpedo Anti-interference Test

ZHANG Hong, NING Yong-cheng

2016, 24(4): 304-309. doi: 10.11993/j.issn.1673-1948.2016.04.0012

[Abstract](883) [PDF 435KB](337)

Abstract:
Anti-interference capacity is a major factor affecting the operational effectiveness of an anti-torpedo torpe-do(ATT), and is evaluated through test. In this study, background construction program and mode for anti-interference test of an ATT are researched. Three kinds of interference modes, i.e. anti-masking interference, anti-deception interference, and anti-passive interference, are analyzed. An index system of ATT anti-interference performance is established, and three schemes of ATT anti-interference test are designed to provide a reference for ATT anti-interference test.

Investigation into Property of Lubricating System for Front Cover of Submarine Torpedo Launcher

MA Liang, XU Ze-lin

2016, 24(4): 309-314. doi: 10.11993/j.issn.1673-1948.2016.04.0013

[Abstract](1047) [PDF 522KB](462)

Abstract:
Aiming at the mechanical noise during opening/closing the front cover of a submarine torpedo launcher, the structure and operating principle of the front cover lubricating system are analyzed. A fault tree of ‘insufficient lubrication’ is established, the key factors influencing the property of the lubricating system are analyzed, and suggestions for improving the lubrication are offered. This study may provide an idea for the researches on submarine lubricating system and noise reduction.

Influence of Tube Opening on Internal Trajectory of Underwater Vehicle Launcher with Ejection Mode

MA Hui

2016, 24(4): 314-320. doi: 10.11993/j.issn.1673-1948.2016.04.0014

[Abstract](1159) [PDF 656KB](387)

Abstract:
A reasonable tube opening scheme for an underwater vehicle launcher is designed to enhance the emission efficiency. The multi-to-multi interface technology is adopted to solve the simulation difficulty of gapless slipping between walls with holes, and a simulation model is built to couple the unsteady flow field, piston and vehicle movement. According to the given initial condition, the internal trajectory simulation of energy storage tube with different area and shape of the hole is accomplished by secondary development in software Fluent, and the obtained flow fields and the movement curve are analyzed. The results show that the area of hole has significant effect on the out-tube efficiency, while the effect of hole shape can be ignored. The out-tube efficiency decreases exponentially with the decrease of the hole area. The reliability of the underwater vehicle launcher simulation based on multi-to-multi interface technology is proved. This study may provide a reference for the design of underwater vehicle launcher with ejection mode.

2016 Vol. 24, No. 4

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