水下无人系统学报

Convective Heat Transfer on Solid of Revolution with Local Heating under Flow-Directional Electromagnetic Force

LI Hui, LIU Zong-kai, ZHOU Ben-mou, JIANG Yong

2016, 24(5): 321-324. doi: 10.11993/j.issn.1673-1948.2016.05.001

[Abstract](942) [PDF 786KB](472)

Abstract:
In this paper, based on the energy equation of convective heat transfer and the basic control equations of flow field, simulation is conducted with the software Elmer to analyze the local convective heat transfer characteristics of the solid of low velocity revolution under the action of flow-direct...

Discussion on Assembly Technique of Torpedo Electronic Section

HUANG Chao

2016, 24(5): 325-328. doi: 10.11993/j.issn.1673-1948.2016.05.002

[Abstract](995) [PDF 237KB](449)

Abstract:
The assembly of electronic section of a torpedo is of great importance in whole torpedo assembly, affecting the performance of the torpedo. In this paper, the existing assembly technique is reviewed, and the key procedures of the assembly technique are summarized, such as sealing, blind-mating, asse...

Waveform Analysis of Acoustic Doppler Flow Measurement

ZHANG Yu-hang, YANG Yun-chuan, LÜ Lin-xia, WANG Hai-lu, YUE Ling, LI Jin-ming

2016, 24(5): 329-333. doi: 10.11993/j.issn.1673-1948.2016.05.003

[Abstract](872) [PDF 640KB](522)

Abstract:
To improve the velocity accuracy and range resolution of Doppler flow measurement technology, this paper comprehensively compares the waveforms of the signals with large product of time-width and bandwidth between the Costas frequency-coded signal and several phrase-coded signals considering practic...

A Method of Target Tracking Data Association in Sea Clutter Background

CHEN Xiao, LI Ya-an, YU Jing

2016, 24(5): 334-339. doi: 10.11993/j.issn.1673-1948.2016.05.004

[Abstract](1286) [PDF 594KB](567)

Abstract:
The problem of surface ship target tracking in strong sea clutter environment is theoretically analyzed and simu-lated by employing the nearest neighbor filter(NNF) algorithm and the probabilistic data association filter(PDAF) algorithm. Based on the PDAF algorithm, the concept of twice-weighted dis...

Waveform Design and Echo Characteristic of Underwater Carrier-free Ultra-Wide Band Signal

HOU Xin-yu, CHEN Hang

2016, 24(5): 340-345. doi: 10.11993/j.issn.1673-1948.2016.05.005

[Abstract](1055) [PDF 530KB](493)

Abstract:
The design of signal waveform is very important for improving torpedo homing performance under complex underwater acoustic environment. Ultra-wide band signal has many advantages in target detection, such as high resolution, strong penetrability, and low duty ratio. In this paper, According to the R...

Waveform Design and Analysis of Torpedo Acoustic Homing in Shallow Water

LEI Jiang-tao, DONG Meng, ZHANG Guo-feng

2016, 24(5): 346-350. doi: 10.11993/j.issn.1673-1948.2016.05.006

[Abstract](1292) [PDF 1147KB](473)

Abstract:
As one of three major design factors of a torpedo active acoustic homing system, waveform design determines the anti-reverberation capability and accurate parameter estimation of the torpedo active acoustic homing system. In this study, ambiguity function is adapted to analyze the anti-reverberation...

Impeller Modal Testing Based on Measuring Points Optimization and Acceleration Sensors

LIU Jing-yun, SUN Tao, PENG Bo, YI Yin, YAN Hai, GAO Hui-zhong

2016, 24(5): 357-361. doi: 10.11993/j.issn.1673-1948.2016.05.008

[Abstract](1162) [PDF 1101KB](1499)

Abstract:
Since torpedo turbine impeller is small and light, the number of acceleration sensors has a direct effect on testing precision and measured order of impeller modal. In order to reduce the number of testing points for the purpose of decreasing the effect of additional mass on the natural frequency of...

Simulation on Flow around Cylindrical Projectile in Water Based on DES model

ZHANG Chi-yu, GUO Rui, LIU Min, LIU Rong-zhong, ZHOU Hao, CHEN Liang

2016, 24(5): 362-367. doi: 10.11993/j.issn.1673-1948.2016.05.009

[Abstract](983) [PDF 896KB](518)

Abstract:
Based on the software Fluent, the flow around a cylindrical projectile in water with high Reynolds number is simulated by using the detached eddy simulation(DES) method. The flow characteristics of the cylindrical projectile are analyzed at the flow rate of 25 m/s, and the lift coefficient, the drag...

Design of Vibration Isolator Against Underwater Explosion for LED Light Source

WANG Wen-guan, ZHOU Li

2016, 24(5): 368-373. doi: 10.11993/j.issn.1673-1948.2016.05.0010

[Abstract](1518) [PDF 1094KB](503)

Abstract:
To directly observe and analyze the impulsion characteristics of the bubbles induced by underwater explosion, a light-emitting diode(LED) light source and its vibration isolator are designed. The characteristics of the vibration isolator under non-contact underwater explosion load are simulated. Fin...

Discussion on Five Problems in Torpedo Test and Evaluation with Improvement Suggestions

HE Cheng-gang, GAO Jiang, WANG Hao

2016, 24(5): 374-378. doi: 10.11993/j.issn.1673-1948.2016.05.011

[Abstract](1046) [PDF 206KB](467)

Abstract:
Five problems existing in the torpedo test and evaluation are discussed, and corresponding improvement methods are suggested as follows: 1) Using the statistical method of repeated failures for reference, the repeated unqualified items can be changed to a single statistics to eliminate the impact of...

Torpedo Approval Lake Test in Actual Combat Condition: Discussion

SUN Quan

2016, 24(5): 379-383. doi: 10.11993/j.issn.1673-1948.2016.05.012

[Abstract](934) [PDF 182KB](470)

Abstract:
The torpedo approval test in actual combat condition is very important for ensuring the equipment reliability. For the purpose of conducting torpedo approval lake test in actual combat condition, the performance of a modern torpedo and its actual combat characteristics are considered, the requiremen...

Vector Control of Dual Three-phase Induction Motor

LI Hong, ZHANG Peng-ju

2016, 24(5): 379-383. doi: 10.11993/j.issn.1673-1948.2016.05.007

[Abstract](827) [PDF 434KB](512)

Abstract:
Dual three-phase induction motor has been widely applied to such fields as ship propulsion, aviation, aerospace, new energy vehicles, and nuclear power because of its high reliability and stability. There are 64 voltage space vectors in six-phase induction motor driven by the six-phase voltage sourc...

Force Analysis and Simulation of Optical Fiber Clew for Wired Communication Buoy

ZHAO Jin-cai, TANG Wei-jiang, SUN Tie-sheng

2016, 24(5): 384-389. doi: 10.11993/j.issn.1673-1948.2016.05.013

[Abstract](1072) [PDF 367KB](329)

Abstract:
To solve the end plate extrusion deformation problem of the wired communication buoy′s optical fiber clew, which is made from lightweight material, in the winding process of guidance optical cable, this paper analyzes the force and deformation of the end plate and shell by considering the structure ...

Analysis on Internal Flow Fields in Different Launch Valve Core Structures in Emergent Launching Condition

CHEN Wei-bin, WANG Xian-ming, DUAN Hao, WANG Yun

2016, 24(5): 390-395. doi: 10.11993/j.issn.1673-1948.2016.05.014

[Abstract](896) [PDF 1449KB](408)

Abstract:
A program-controlled valve, which can complete launch mission in emergent condition, is vital to ensure successful launching of a torpedo in war. To explore whether the valve core can keep good launching quality in emergent conditions, the finite element simulation software FLUENT is employed to sim...

Influence of Tube′s Inner Diameter on Interior Trajectory for Underwater Vehicle Ejection Launcher

MA Hui

2016, 24(5): 396-400. doi: 10.11993/j.issn.1673-1948.2016.05.015

[Abstract](699) [PDF 678KB](416)

Abstract:
To balance launch efficiency and size of an underwater vehicle launcher and design proper inner diameter of the launching tube, the many-to-many interface scheme is adopt to overcome the simulation difficulty of gapless slipping between the walls with holes, and a simulation model for solving couple...

2016 Vol. 24, No. 5

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