水下无人系统学报

Analysis and Simulation of Moving Stability for Rocket-assisted Torpedo without Umbrella

WANG Gai-di, SHI Xiao-long, LIU Meng-qin

2015, 23(6): 401-404. doi: 10.11993/j.issn.1673-1948.2015.06.001

[Abstract](642) [PDF 654KB](416)

Abstract:
This paper analyzes the factors influencing moving stability of a rocket-assisted torpedo without umbrella, builds a mathematical model of movement with interference, and performs simulation with different interference. Simulation result shows that the free flight movement of the rocket-assisted torpedo without umbrella has the unstable and divergent characteristics. This result may provide a reference for determining separation condition of a rocket and a torpedo, and for trajectory design and improvement of a rocket-assisted torpedo without umbrella

Optimization Method of Reliability Allocation Based on Minimum CostGAO Jun-dong

GAO Jun-dong

2015, 23(6): 405-409. doi: 10.11993/j.issn.1673-1948.2015.06.002

[Abstract](809) [PDF 262KB](340)

Abstract:
An optimization method of reliability allocation based on minimum cost is proposed by making use of the expert allocation method for the redesign of certain underwater television surveillance equipment. Considering the requirements of the redesign, the reliability of each subsystem is reordered and reallocated, and the reliabilities of the subsystems in the condition of minimum cost are achieved under the constraint of the cost function. Simulation result verifies the minimum cost. The proposed method is easy in practical application, and may facilitate reliability allocation in underwater product redesign

Mechanical Reliability Analysis of Releasing Device for Underwater Vehicle

ZHOU Wei, XUE Lai, ZHAO Min

2015, 23(6): 410-413. doi: 10.11993/j.issn.1673-1948.2015.06.003

[Abstract](685) [PDF 448KB](411)

Abstract:
Whether an underwater vehicle can complete its mission depends on the normal operation of its releasing device. In this paper, the mechanical reliability analysis software FREET is employed to analyze the reliability of the key components of the releasing device with the JC method. The results obtained may be a reference for further design of an underwater vehicle

Modeling and Simulation of Layered Seafloor Reverberation Space-Time for Arbitrary Array

ZHAO Dong-liang, LIANG Hong, YANG Chang-sheng, ZHENG Ya-ning

2015, 23(6): 414-419. doi: 10.11993/j.issn.1673-1948.2015.06.004

[Abstract](639) [PDF 1093KB](338)

Abstract:
Considering the layered medium in the seafloor environment, a reverberation space-time model adapted to the arbitrary array was established for the layered seafloor. The impacts of the Doppler shift, the direction of scattering body, the inhomogeneity of sediment and basement, and the sediment-water interface on the reverberation were considered in the model. All the received scattering signals were superposed at the array element to form the single channel output of the reverberation. The proposed space-time model of the reverberation was adapted to the complex seafloor environment. The reverberation of continuous wave(CW) signal was simulated using this model. By comparing the characteristics of the simulated reverberations in time domain and 2D space-time domain with the theoretical expectation, the validity and accuracy of the proposed reverberation space-time model are proved.

Application of Localization Method Based on Time Delay Difference and Hyperboloid to Torpedo Water-Entry Point Measurement

LI Wei-hua, XUE Fei, MA Jin-yin

2015, 23(6): 420-422. doi: 10.11993/j.issn.1673-1948.2015.06.005

[Abstract](948) [PDF 355KB](367)

Abstract:
To measure torpedo water-entry point in real time, a localization method of time delay difference and hyperboloid based on multiple array is proposed. This method can measure the geodetic coordinates of a target with the precision of 10 m(standard error) without needing the azimuth of vector. The influence of time measurement error of buoy array on localization precision is discussed, and the result shows that the maximum measurement error in the buoy array is no more than 4 m.This method is verified by sea trial.

Design of Preamplifier Module for Piezoelectric Thin Film Transducer in Polyvinylidence Fluoride

GUAN Ling, WANG Xu

2015, 23(6): 423-427. doi: 10.11993/j.issn.1673-1948.2015.05.006

[Abstract](649) [PDF 411KB](344)

Abstract:
The noise properties of a preamplifier module directly influence the receptivity of a piezoelectric thin film transducer of polyvinylidence fluoride(PVDF). According to the characteristics of the PVDF piezoelectric film transducer, this paper designs a preamplifier module to match the transducer. Interferences and noises are eliminated by the anti-interfere technology applied for analog signal processing. The design factors of the preamplifier module are considered. The design module is simulated via the software Multisim12 and tested in laboratory. The results show that the input noise of this module is lower than –130, which infers that the designed preamplifier module meets the requirement of underwater acoustic signal processing equipment.

Application of CKF Algorithm Based on Square Root of Variance to Torpedo Tracking

LIU Qing-hui, GAO Jiang, DENG Nan-ming

2015, 23(6): 428-432. doi: 10.11993/j.issn.1673-1948.2015.06.007

[Abstract](955) [PDF 431KB](465)

Abstract:
The existing unscented Kalman filter(UKF) algorithm results in non-definite covariance easily in high-dimensional system, which leads to instability of filter and even divergence. In this paper, the application of cubature Kalman filter(CKF) algorithm based on square root of variances to underwater target tracking is discussed. This algorithm can achieve a group of cubature points with same weight based on the cubature principle, transform the points set into the new points by non-linear system equation in order to predict the system state at next time, and ensure symmetry and positive definiteness of the covariance matrix by using the square root of the variances of propagation state. Simulation results show that CKF is better than UKF in estimation precision.

A FPGA Implementation Method of Data Transmission through Optical Fiber Bus for Wire-Guided Torpedo

LI Zi-long, WANG Zhong, GAO Zhuo, ZHU Yun-zhou, ZHU Jian-guo

2015, 23(6): 433-438. doi: 10.11993/j.issn.1673-1948.2015.06.008

[Abstract](927) [PDF 522KB](462)

Abstract:
According to the characteristics of optical fiber data transmission, this paper proposes a data transmission method through the optical fiber bus of a wire-guided torpedo based on field-programmable gate array(FPGA).The method combines the custom framing format with the 8B/10B coding and decoding, and can be achieved only by a single FPGA. It simplifies the system structure, and has the advantages such as simple composition, small transmission delay and high transmission reliability. Simulation result shows that the bit error rate is less than 10-6 as the effective optical fiber transmission rate is 100 Mb/s. This method can realize reliable data transmission through Ethernet bus for optical fiber wire-guided communication.

Vibration Control of Engine Support Structure Based on Modal Contribution Method

SONG Wen, LIANG Yue, GAO Ai-jun, LI Zhi-min, SUN Yan, BAI Yi ming

2015, 23(6): 439-443. doi: 10.11993/j.issn.1673-1948.2015.06.009

[Abstract](623) [PDF 1242KB](423)

Abstract:
Based on modal contribution method, this paper proposes a vibration attenuation with damping technique to effectively control vibration response of a torpedo engine support structure. Firstly, the basic principle of modal contribution is explained. Then, the contributions of different-order modals of the engine support structure are calculated in the frequency range of 20~1000 Hz. Finally, a vibration control scheme of free damping layer is proposed according to the analysis of the contributions, and damping control is exerted on the predominant modal with greater contribution. Comparison between the conditions with and without the damping control shows that the damping vibration attenuation technique based on modal contribution method can effectively reduce the damping vibration of a torpedo engine support structure.

Flow Characteristics Simulation of Variable Fuel Pump Based on PumpLinx

WANG Kai, SUN Tao, SHI Xiao-feng, YI Yin, LI Yong-dong, HUANG Yan-fen

2015, 23(6): 444-448. doi: 10.11993/j.issn.1673-1948.2015.06.010

[Abstract](725) [PDF 686KB](934)

Abstract:
To reveal the flow characteristics of the variable fuel pump for a torpedo, this paper proposes a hydraulic simulation method of the static variable cylinder valve axial piston pump by using the rotary cylinder plunger pump template in the professional pump computational fluid dynamics(CFD) simulation software PumpLinx, and further simulates and analyzes the flow, pressure and cavitation of the pump. Simulation results show that this pump does not produce cavitation, but there exists obvious pulse offlux with unsmooth transition. This research may benefit the improvement and design of the fuel pump with variable valve angle.

Requirements and Concepts of Depth Setting Design for Modern Torpedo

AI Dong, HE Hua-yun

2015, 23(6): 449-453. doi: 10.11993/j.issn.1673-1948.2015.06.011

[Abstract](588) [PDF 252KB](644)

Abstract:
Aiming at the major problems of depth setting design for traditional torpedoes, this paper puts forward requirements and concepts of modern torpedoes′ depth setting design with focus on three transforms of design idea and two expansions of strike ability. This study may improve operational efficiency of a torpedo, and provide a reference for design of new type torpedo and weapon system.

Modeling and Simulation of Acquisition Probability Model for Terminal Guidance of Anti-Torpedo Torpedo

XIAO Cong-shan, YANG Hui-zhen

2015, 23(6): 454-460. doi: 10.11993/j.issn.1673-1948.2015.06.012

[Abstract](1070) [PDF 464KB](847)

Abstract:
An analytical model of acquisition probability for terminal guidance of anti-torpedo torpedo (ATT) is established. Firstly, by considering the position error between an ATT and an incoming torpedo at the moment when midcourse guidance changes over to terminal guidance, the acquisition probability is described as an double integration of the probability density function in the domain determined by homing sector angle and homing range. The integration area is approximated to a rectangle. Then, an analytical expression of ATT′s acquisition probability, which relates to the position error between ATT and target, the distance from ATT to target, the ATT homing range, and the homing sector angle, is deduced. The effects of these four variables on ATT acquisition probability are analyzed quantitatively via simulation.

Firing Organization and Salvo of Passive Acoustic Homing Torpedoes

LI Meng

2015, 23(6): 461-464. doi: 10.11993/j.issn.1673-1948.2015.06.013

[Abstract](652) [PDF 229KB](374)

Abstract:
Based on the analyses of the purposes and demands of torpedoes salvo and the mechanism of mutual guidance of a passive acoustic torpedo, this paper proposes a program to avoid the front-torpedo from being in the detecting range of the back one by firing control, then establishes a model to calculate firing parameters and presents a salvo organization method. Simulation results indicate that the program can avoid the mutual guidance effectively, and is very convenient for operating, which facilitates the salvo of passive acoustic homing torpedoes.

Military Application and Technical Scheme of Digital Torpedo

LI Ben-Chang, LI Yuan

2015, 23(6): 465-469. doi: 10.11993/j.issn.1673-1948.2015.06.014

[Abstract](985) [PDF 244KB](349)

Abstract:
According to the needs for operational simulation and military simulation training, this paper proposes a concept of a digital torpedo and its technical requirements by considering the complexity of a modern torpedo and its interaction with weapon system, and builds a torpedo trajectory model and an external control model with interfaces. Moreover, the technical scheme of a digital torpedo is designed by adopting the external trajectory simulation method, in which performance parameter is related to torpedo type, and trajectory stages are related to simulation process and tactical situation. In addition, an application example of an operational simulation training system is programmed with Visual C++. The result shows that the scheme can meet the requirements of real-time, accuracy and expansibility for an operational simulation training system.

Discussion on Fault Treatment Requirements for Range Test

CHEN Dong-ke, YOU Xiu-dong

2015, 23(6): 470-474. doi: 10.11993/j.issn.1673-1948.2015.06.015

[Abstract](1127) [PDF 212KB](404)

Abstract:
Fault treatment is throughout the whole process of the design approval test in the range. How to exactly execute the fault treatment procedure when a fault occurs and return the fault to zero is vital for keeping the test equipment running properly, and for examining the test capability of the range. However, the fault treatment regulations in the existing rules of the army, the military standards and the range quality management system are of principle without specific treatment requirements. In this paper, according to real requirements of the range, detailed fault treatment procedures are established and corresponding requirements are proposed based on the rules of the army, the military standards and the quality management system of the range, and fault treatment requirements of whole test process are presented to provide a reference for the design approval test in the range.

Evaluation Method for Working Reliability of Aerial Depth Bomb in Sea Trial

SHAO Zong-zhan, MA Hao-wen

2015, 23(6): 475-480. doi: 10.11993/j.issn.1673-1948.2015.06.016

[Abstract](962) [PDF 240KB](353)

Abstract:
The working reliability of aerial depth bomb in sea trial is a necessary evaluation indicator for product qualification test. We take the test data of the product as prior information to determine the test sampling plan based on Bayes hypothesis testing for binomial distribution. Calculation result indicates that Bayes hypothesis testing method can help shorten development period of the equipment, save spending, promote the engineering application research of small sample statistical theory, and enhance confidence level of experiment conclusions.

2015 Vol. 23, No. 6

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