水下无人系统学报

Cavitation Hydrodynamic Test for a New Grid Fin in Water Tunnel

XIA Yan-yan, CHEN Wei-qi, WANG Bao-shou

2014, 22(5): 321-324. doi: 10.11993/j.issn.1673-1948.2014.05.001

[Abstract](1341) [PDF 407KB](550)

Abstract:
To design a new grid fin for an underwater unmanned vehicle, a test was carried out to investigate the influ-ences of the frame profile of grid fin and the number of grid plate on the hydrodynamic characteristics of grid fin. Four kinds of grid fins were tested to obtain their hydrodynamic characteristics, and the results indicate that: 1) the frame profile of one grid fin with low-drag shape has significant anti-drag effect; 2) increasing the number of grid plate can gain high lift force, but will increase drag; 3) as cavitation occurs on the grid fin, the lift force descends rapidly and the drag descends slightly.

Analysis and Engineering Calculation of Torpedo Floating Attitude at Running End

ZENG Xiao-fan, CAI Wei-jun, XU Xin-dong, WANG Gai-di, BIAN Xiang

2014, 22(5): 325-328. doi: 10.11993/j.issn.1673-1948.2014.05.002

[Abstract](1304) [PDF 222KB](469)

Abstract:
Successful recovery of a torpedo in sea trial is closely related to its floating attitude at running end. This paper proposes an intuitive and simple engineering calculation method of torpedo floating attitude at running end by analyzing the factors of influencing the floating attitude and the floating process. Sea trial verifies the correctness of the proposed engineering calculation method. This method can be simply applied to the torpedo design and sea trial, in terms of gen-eral structure layout, recovery plan, and match of balance weight parameters. This method can also be applied to the floating attitude calculation of other autonomous underwater vehicles.

Reliability Evaluation and Verification of Torpedo Storage Based on Bayesian Theory

ZHOU Kun, CHEN Yi-hui, ZHOU Tao

2014, 22(5): 329-332. doi: 10.11993/j.issn.1673-1948.2014.05.003

[Abstract](1199) [PDF 237KB](514)

Abstract:
To evaluate the reliability of torpedo storage, Bayesian theory is used to estimate the mean time between fail-ures(MTBF) of torpedo storage. A mathematical model for reliability verification of torpedo storage is established, and the corresponding plan of the reliability verification is formulated. Not only the sample information is used by the plan in this paper, but also the prior information of a torpedo. So the evaluation of torpedo storage reliability can be more reasonable.

A Biomimetic Estimator of Range with High-Resolution

LIU Hua-feng, LIANG Hong, YANG Chang-sheng

2014, 22(5): 333-336. doi: 10.11993/j.issn.1673-1948.2014.05.004

[Abstract](818) [PDF 332KB](453)

Abstract:
This paper analyzes the bat echolocating model, biomimetically changes the parameters of the model, and uses a modified basis vector to apply the model to the underwater active systems within a high-frequency band. Simula-tion results show that the range estimator based on the biomimetic signal processing model can distinguish the aliasing echoes distinctly to improve the range resolution with better performance than that of the correlator.

Modeling and Simulation for Evaluation of Multiple-Target Threat Against Torpedo

YANG Xiang-feng, YANG Yun-chuan, ZHANG Kui, SHI Lei

2014, 22(5): 337-340. doi: 10.11993/j.issn.1673-1948.2014.05.005

[Abstract](914) [PDF 281KB](380)

Abstract:
One of the most important countermeasures taken by a submarine against a torpedo is using equipments of acoustic countermeasure to decoy or interfere with the torpedo. The submarine and the equipments of acoustic counter-measure coexist in special time and location, exhibiting multiple targets for the torpedo. So the torpedo must evaluate and choose the most threatening target to assure the operational efficiency. In this paper, the threat factors of the multiple targets and their effect on the threat evaluation are analyzed. A quantification method of the threat factors is proposed, and an evaluation model of multiple-target threat for torpedo is established for torpedo selective attack on multiple tar-gets.

Nonlinear Modeling and Prediction of Underwater Acoustic Signal

SUN Yan, LI Ya-an, CHEN Xiao, DAI Miao, GAO Wen-juan

2014, 22(5): 341-346. doi: 10.11993/j.issn.1673-1948.2014.05.006

[Abstract](1269) [PDF 546KB](537)

Abstract:
The prediction and filtering of underwater acoustic signals, especially of reverberation interference and back-ground noise, lay the foundation of underwater target signal detection and processing of non-stationary, non-Gaussian and nonlinear underwater acoustic signals. In this paper, based on the linear theory of least square estimation and the Volterra series theory, two prediction models of target signal are established to conduct one-step and multi-step predic-tions. Thus, the optimal prediction parameters are obtained by comparing and analyzing the prediction results. Simula-tions show that the prediction model based on singular value decomposition of Volterra series achieves more accurate results in predicting the underwater acoustic signal, and its relative error of prediction is one-order of magnitude smaller, compared with the model based on least square estimation.

Analysis and Optimization Design of Metal-Split Casing for Torpedo Magnetic Coupling Drive

WANG Xiao-lei, FAN Xiao-bo

2014, 22(5): 347-351. doi: 10.11993/j.issn.1673-1948.2014.05.007

[Abstract](768) [PDF 1373KB](493)

Abstract:
The technology of magnetic coupling drive can be applied to the stern shaft seal of the torpedo for attacking at large depth. However, the optimization design and the power loss analysis of the metal-split casing in this technology are difficult. In this paper, the optimization design and parameters calculation are performed according to the operation characteristics of a magnetic coupling drive device. Two-dimensional(2D) and three-dimensional(3D) finite element models of power loss are established to analyze the induced current and eddy current loss. 3D finite element models of compressive strength are also established to analyze the compressive strength of the metal-split casing. Simulation re-sults show that thus designed metal-split casing meets the strength requirement with lower eddy current loss．

Performance Evaluation Index System of Torpedo Thermal Power System

MA Wei-feng, PENG Bo, GAO Ai-jun, LEI Yun-long, HAN Xin-bo, LU Jun

2014, 22(5): 352-356. doi: 10.11993/j.issn.1673-1948.2014.05.008

[Abstract](875) [PDF 250KB](591)

Abstract:
To improve the comprehensive evaluation of a torpedo thermal power system and compare different evalua-tion plans for same system, a performance evaluation index system is proposed based on the experience from related industries in China. The performance evaluation index system is established by using the related matrix method and considering the weight of each index. Through calculating the weighted sum of the indexes of different thermal power systems, the evaluation values of indexes of each plan are achieved, and the multi-objective quantization method is dis-cussed. The proposed performance evaluation index system and the corresponding evaluation method can be applied to the comparison of torpedo thermal power systems with different energy, the improvement of the power systems with same energy. In addition, this performance evaluation index system may reflect development trend of torpedo thermal power systems, and provide a support for type decision of future thermal power systems.

An Equivalent Loading Method for Underwater Explosion Impact Experiment

YANG Yi-fang, GUO Rui, LIU Meng-meng, LIU Rong-zhong

2014, 22(5): 357-360. doi: 10.11993/j.issn.1673-1948.2014.05.009

[Abstract](1356) [PDF 317KB](551)

Abstract:
An equivalent loading method for laboratory simulation is put forward to solve the problems in existing ex-perimental studies of underwater explosion impact response. In the new method, flyer impact is adopted to achieve the equivalent load of underwater explosion. An equivalent theoretical model is established, and its analysis result is com-pared with that of the fluid-solid coupling numerical simulation. The comparison shows that both results agree well. By using this theoretical model, the required equivalent load for different underwater explosion impact can be achieved by adjusting the flyer′s impact velocity and specific mass of impact. This study may provide a new idea for research on torpedo explosion impact response of typical ship structure.

Simulation of Trigger Sensitivity of Anti-Torpedo Torpedo Warhead

WANG Wan-fan, QU Da-wei, BAI Zhao-gao

2014, 22(5): 361-365. doi: 10.11993/j.issn.1673-1948.2014.05.010

[Abstract](980) [PDF 775KB](528)

Abstract:
The trigger sensitivity simulation of anti-torpedo torpedo(ATT) warhead is the key technology for an ATT to detonate warhead by triggering fuze. We establish an incoming torpedo model and an ATT model with the finite element analysis(FEA) software ANSYS LS-DYNA, simulate the ATT hitting the incoming torpedo with different speeds and different angles, and obtain the characteristic of dynamic response. This study may benefit the sensitivity design of trig-ger sensitive device in ATT warhead.

Utility Analysis of Underwater Explosion Against Torpedo Sonar

PEI Shan-bao, LIU Rong-zhong, GUO Rui

2014, 22(5): 366-369. doi: 10.11993/j.issn.1673-1948.2014.05.011

[Abstract](1095) [PDF 420KB](485)

Abstract:
It is difficult to evaluate the effect of underwater continuous explosion countermeasure against torpedo sonar due to the complexity of tactical application and operational situation in acoustic countermeasure. This paper analyzes the principle of underwater continuous explosion countermeasure against torpedo sonar and the countermeasure models of active and passive sonar. Active sonar detection models are established with and without underwater explosion inter-ference, the active sonar detection distances are solved with these models in the conditions of different frequencies and charges. And the average reduction amount and reduction rate of the detection distances are used to judge the counter-measure utility via simulation, and to analyze the variations of active sonar detection distance versus frequency and charge with and without underwater explosion interference.

Development and Implementation of Interactive Electronic Technical Manual for Torpedo Usage and Maintenance

XU Lei, LIU Hui-qin

2014, 22(5): 370-376. doi: 10.11993/j.issn.1673-1948.2014.05.012

[Abstract](725) [PDF 1130KB](636)

Abstract:
To overcome the difficulties in application of printed technical manual to torpedo′s usage, storage, and up-dating, the interactive electronic technical manual(IETM)-based usage and maintenance of a torpedo are explored. First, the current development status and key technology of the IETM are analyzed. Then, the development of the IETM for usage and maintenance of a torpedo is performed in accordance with the characteristics of torpedo equipment, including the establishment of overall developing framework, the selection of general developing platform, and the technical im-plementation. In the case of technical implementation, five key aspects are discussed in detail in terms of the IETM de-veloping standard for torpedoes, the definition of content data models, the implementation of virtual simulation func-tions, the implementation of interactive functions, and the IETM system integration. Finally, a developing example of the IETM for a torpedo is given.

Minimum Torpedo Range and Its Tactical Significance

LI Yuan, LI Ben-chang

2014, 22(5): 377-380. doi: 10.11993/j.issn.1673-1948.2014.05.013

[Abstract](1130) [PDF 266KB](544)

Abstract:
By analyzing the minimum range and shooting distance of a torpedo, it is concluded that the minimum range of a sub-launched torpedo is the unique parameter to describe its minimum shooting area in certain shooting conditions, according to the meeting principle of a sub-launched torpedo. The factors influencing the minimum range are analyzed, and a method for calculating the minimum range is given. According to the detection capability of a launch platform and possible tactical situations, the limit of the minimum range to the fighting task of tactical platform is discussed, and suggestions for reducing the minimum range are offered.

Research on the Maximum Hitting Probability Model of Torpedo

ZHANG Chi, LI Heng, PENG Pei

2014, 22(5): 381-384. doi: 10.11993/j.issn.1673-1948.2014.05.014

[Abstract](733) [PDF 305KB](794)

Abstract:
Before torpedo attack, the fire control system needs to calculate maximum hitting probability(MHP) at certain firing position based on certain mathematical model for commander′s attack decision. For the purposes of simplification of the model and conveniently embedding the model into the system, the hitting probability is expressed as the function of the geometrical motion characteristic at firing to obtain MHP of a torpedo through first approximation. Regression analysis is performed to verify the effectiveness of the model. The results may provide commander a reference for fast estimation of shooting effect and attack decision.

Improvement of Wire-guided Torpedo Simulator

MAO Xiang-hui, YE Hui-juan, ZHANG Ning

2014, 22(5): 385-389. doi: 10.11993/j.issn.1673-1948.2014.05.015

[Abstract](1141) [PDF 343KB](516)

Abstract:
To meet the requirement of battle and training, the conventional wire-guided torpedo simulator was improved. The improvement is based on complex programmable logic device (CPLD) and C++ Builder, and adopts the structure of “industrial personal computer(IPC)+ISA bus+ CPLD+ personal computer(PC) software”. By analyzing the shortcomings of the conventional simulator, the functional requirement and general design scheme of the improved simulator were put forward. The improvement concerns two aspects: 1) an interface circuit and a bridge circuit used for connecting the in-terface circuit and the ISA bus are employed for the hardware; and 2) the software is developed with the C++ Builder to drive the hardware through the Win IO function. This improved wire-guided torpedo simulator showed satisfactory ef-fectiveness in trial stage, and its main performance parameters met the design requirement.

Simulation of Interior Trajectory of Torpedo Launched from Elastic Rubber Launcher

LI Zong-ji, REN Lei, SUN Yu-song, LIANG Neng-gui

2014, 22(5): 390-395. doi: 10.11993/j.issn.1673-1948.2014.05.016

[Abstract](962) [PDF 553KB](606)

Abstract:
To improve the antisubmarine ability of a high speed auxiliary ship, two basic structure schemes of elastic rubber launcher for a torpedo are put forward according to the characteristics of the auxiliary ship. Based on the schemes, a mathematic model of torpedo interior trajectory is built by using the theories such as constitutive model of elastic ma-terial, and simulation of launching process is conducted. Simulation result shows that it is theoretically applicable for the elastic rubber launcher to launch lightweight torpedoes on the water.

Process Simulation of Torpedo Swim-out Launching from UUV

SUN Yu-song, LI Zong-ji, LIAN Yong-qing

2014, 22(5): 396-400. doi: 10.11993/j.issn.1673-1948.2014.05.017

[Abstract](1246) [PDF 585KB](614)

Abstract:
Externally hung torpedo on an underwater unmanned vehicle(UUV) is of great tactical significance in warfare. Because UUV is small in volume and light in weight, its movement state will change when a torpedo swims out from it. In this paper, to analyze quantitatively the parameter change for verifying the reliability of torpedo launching, a movement model of a torpedo swim-out launching from UUV is built, and the launching process is simulated by the software FLUENT. Simulation results indicate that the movement state of UUV changes in the launching process, but this change will not significantly affect torpedo swim-out launching. In addition, the movement parameters of the tor-pedo leaving the launcher are obtained, which may provide a reference for precise calculation of torpedo’s exterior tra-jectory.

2014 Vol. 22, No. 5

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