Table of Content

30 November 2016, Volume 37 Issue 11

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Paper

Application of Ultrasonic Real-time Measurement Technology in Solid Rocket Motor

SUN De-chuan, QUAN En, CAO Meng-cheng

2016, 37(11):  1969-1975.  doi:10.3969/j.issn.1000-1093.2016.11.001

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Ultrasonic measurement of burning rate is an advanced technique. For application of ultrasonic measurement in solid rocket motor test, some typical materials used in solid rocket motor (SRM) are measured by ultrasonic technique, and their ultrasonic signal signatures were obtained. The real-time thickness variation of solid propellant at ordinary pressure is measured by an ultrasonic transducer mounted on the outside of the motor shell. A data processing method is proposed to manipulate the echo wave for real-time measurement of burning rate. The proposed method was successfully used in a hot fire test in which the propellant burns at ordinary pressure. The variation in thickness of propellant and its burning rate at ordinary pressure was obtained. The influence of temperature distribution near burning surface on burning rate test is analyzed. The results show that for motor with metal shell, a window must be made on the metal shell to let enough ultrasonic wave energy penetrate the interface between shell and isolator, and for composite shell motor the probe can be mounted outside the shell directly. The influence of temperature variation near burning face caused by combustion on measurement is negligible. The proposed data processing method can be used effectively to obtain the variation of grain thickness.

Influences of Typical Service Conditions on the Barrel Life of Large-caliber Machine Gun

QI Yu-hui， YANG Ming-hua， SHAN Yong-hai， XU Cheng

2016, 37(11):  1976-1982.  doi:10.3969/j.issn.1000-1093.2016.11.002

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The barrel life of large-caliber machine gun is closely related to the service mode and condition. The research on the influences of service conditions on barrel life is of great importance to the safe and effective use of this kind of weapons. The influences of the ambient temperature, the total amount of projectiles shot in a cooling cycle and the interval time of box magazine exchanges on barrel life of large-caliber machine gun are studied. The interface transient stress between chrome layer and steel body in barrel bore is obtained by thermoelastic coupling FEA model of gun barrel. The fatigue life of interface between chrome layer and steel body in barrel bore is solved by using local stress-strain method. The influences of service conditions on barrel life are analyzed. The influences of three service conditions on barrel life are also studied. The rules of quantitative influences of three service conditions on barrel life are obtained. A life approximation model of 12.7 mm machine-gun barrel based on the ambient temperature, the total amount of projectiles shot in a cooling cycle and the interval time of box magazine exchanges is established.

Robust Design of Random Factors on Gun Firing Dispersion

WANG Li-qun, YANG Guo-lai, LIU Jun-min, GE Jian-li

2016, 37(11):  1983-1988.  doi:10.3969/j.issn.1000-1093.2016.11.003

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To study the effective ways to improve the firing dispersion and solve its optimal design problem considering random factors, a calculation method of parameters interval oriented by the predefined indicators is proposed by using robust design theory based on random model and random optimization. A large caliber howitzer data is used to calculate firing dispersion based on Monte Carlo simulation and six degrees of freedom exterior ballistics model, and the statistical properties of firing dispersion are analyzed. A random model of robust design is built by calculating the objective criteria of robust design including unqualified probability and sensitivity index. Based on multi-objective genetic algorithm (NSGA-II) and BP neural network, the random model is optimized to determine the parameters interval of random factors which meet the requirements. The analysis results show that the proposed method can ensure the optimality and robustness of firing dispersion, and is feasible for the prediction of firing dispersion.

Research on Relation between Sampling Pulse Width and Output Signal Amplitude for Ultra-wideband Radio Fuze

LI Meng， HUANG Zhong-hua

2016, 37(11):  1989-1994.  doi:10.3969/j.issn.1000-1093.2016.11.004

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Ultra-wide bandwidth (UWB) radio fuze receiver receives a target echo signal based on a correlation receiving principle. The signals from fuze receiver are obtained by the correlation calculation of echo signal and delayed sampling pulse signal. The sampling pulse width can be optimized to increase the detection sensitivity of UWB fuze. A correlation receiving mathematical model of UWB fuze is established based on the correlation receiving theory, and the relationship between the sampling pulse width and the amplitude correlation receiver function is analyzed. The received output signals are simulated when transmitted pulse width is 50 ps, 100 ps and 200 ps. The simulated results show that the fuze-received output signal has the maximum amplitude when the sampling pulse width is the same as the transmitted pulse width.

Study of Virtual Test Technology of Damage Elements Penetrating into Gelatin

YUAN Da-wei, LI Dan, WANG Xue-jiao

2016, 37(11):  1995-2001.  doi:10.3969/j.issn.1000-1093.2016.11.005

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In order to predict the damage effect of damage element, the actual test is replaced with a virtual test. Based on the accurate simulation technology of damage elements penetrating into gelatin, the solution of K file of finite element software DYNA is combined with the development of VC++6.0 program in consideration of random variables in practical test, test conditions, test sample size, data processing, test result evaluation and virtual scene. The random variables are added to the solution of K file automatically, and the relative standard deviation formula and damage effectiveness evaluation equation are integrated. The virtual test results are analyzed. A database is built for damage element data, virtual experimental data and the measured data for result comparison. The results show that the multiple virtual test results are distributed in a stable range, and the multiple virtual test results are consistent with the actual test results.

Joint Survey Design and Test of Common Optical Path of Hyperspectral Lidar

FU Cheng-qun，FANG Liang，XIE Li-jun，WANG Yong

2016, 37(11):  2002-2009.  doi:10.3969/j.issn.1000-1093.2016.11.006

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In order to accurately detect the distances, orientations and spectral properties of air, ground and underwater targets, the measuring principle and calculation model of common optical path of higyperspectral lidar are discussed, and a principle prototype design method is proposed. The detection test of common optical path of higyperspectral lidar is carried out. The synthetic data of hyperspectrum and lidar are generated, each point contains the scanner coordinate information and spectral information. By comparing the data before and after synthesis, the camouflaged targets can be identified, and the targets can be also accurately located. The experimental results show that the measuring method for common optical path of hyperspectral lidar is feasible.

Task Scheduling Design of Phased Array Radar Based on Fuzzy Neural Network

ZHENG Yu-jun， TIAN Kang-sheng， ZHANG Jin-lin， LIU Jun-kai

2016, 37(11):  2010-2014.  doi:10.3969/j.issn.1000-1093.2016.11.007

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As the task scheduling of phased array radar is a complex nonlinear optimization process, a mathematical model is difficult to be established for task priority, which may affect the efficiency of task scheduling. A phased array radar task scheduling algorithm is proposed based on self-adaptive fuzzy neural network. The proposed scheduling algorithm has neural network autonomous learning ability and fuzzy control capacity for dealing with uncertain information. The simulated result shows that the method is effective. The method can be used to schedule and implement more tasks while scheduling the tasks with higher priority under the condition of saturated object number.

Analysis and Simulation of the Power of Laser Communication Acquisition Link in Air-Air Optical Communication

XU Chun-feng, HAN Cheng, JIANG Hui-lin

2016, 37(11):  2015-2021.  doi:10.3969/j.issn.1000-1093.2016.11.008

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In order to study the effects of the key link and channel in air-air laser communication system on beacon power, the change of beacon power from laser emission to detector receiving is analyzed, and the simulation system of air-air optical communication acquisition link is established based on the relation between signal-to-noise ratio and detection probability of acquisition detector. A simulation system is used to analyze the detection probabilities under different atmospheric visibility. The required minimum transmitting power and maximum communication distance are analyzed with detection probability of 99%. The results show that the greater the transmitting power is, the more obvious the impact of atmospheric visibility on the detection probability of the air-air laser communication is. When the transmitting power is constant, the atmospheric visibility is higher, and the longest link distance is greater. When the transmitting power of beacon is 5 W and the ground atmospheric visibility is or more than 10 km, the relevant maximum communication link of 150 km can be achieved. The relationship between the transmitting power of beacon and the detection probability is explored by the simulation system. The field experiment is carried out on the basis of simulation, which could effectively simulate the acquisition and detection probability of air-air laser communication.

An Improved Multi-path Routing Protocol in Mobile Ad Hoc Network

LI Xu， QIU Song-qing， PENG Jin-lin， WANG Cong

2016, 37(11):  2022-2028.  doi:10.3969/j.issn.1000-1093.2016.11.009

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Multi-path routing protocol can effectively reduce the probability of communication interrupt and end-to-end delay by establishing and maintaining multiple alternate paths in mobile ad-hoc network. The current analysis methods of the number of alternate paths are unavailable for the complex wireless ad-hoc network transmission environment. The existing multipath routing protocols can’t meet the requirements of mixed services. In order to solve the above-mentioned problems, the models for single-path and multi-path routing protocols are established to analyze the effect of the number of alternate paths on the performance of multi-path routing protocol. An application-oriented ad hoc on-demand multipath distance vector （A-AOMDV) is proposed, in which many parameters, such as hop, average connectivity, minimum bandwidth and so on, are considered, and the best path is selected for any service. The simulated result shows that the delivery rate of data service can be increased by 25% and the average delay of voice service can be reduced by 10%~20% by adjusting the weights of parameters. The proposed protocol can selectively improve the properties of delay, reliability and available bandwidth for different services.

The Effects of Water Depth and Length-to-diameter Ratio on Drag Coefficient and Cavity Shape of Underwater Supercavitating Projectiles

SHI Hong-hui, ZHOU Yang-jie, JIA Hui-xia, ZHU Bang-bang

2016, 37(11):  2029-2036.  doi:10.3969/j.issn.1000-1093.2016.11.010

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The supercavitating flows caused by projectiles with 3 different length-to-diameter ratios at 6 different depths of water are studied using a high-speed camera and a horizontal supercavity test apparatus. The research results show that, with the increase in water depth, the cavity’s volume or size becomes smaller and its life time becomes shorter, as well as the drag coefficient of projectile increases. When the projectiles are completely covered by supercavity and their velocities are almost same, the cavity’s volume keeps unchanged with the increase in the aspect ratio, but its drag coefficient increases. As the water depth decreases, the supercavity starts to interact with the free surface. This causes the increase in the cavity’s volume (size) and life time, which is believed due to that the air in atmosphere has entered into the supercavity. For the first time, the interaction process between supercavity and free surface is discussed deeply.

A Fuzzy Adaptive Algorithm for Maneuvering Target Based on Current Statistical Model

LIU Wang-sheng, PAN Hai-peng, LI Ya-an

2016, 37(11):  2037-2043.  doi:10.3969/j.issn.1000-1093.2016.11.011

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A fuzzy adaptive algorithm is proposed for the imperfections of tracking a maneuvering target using conventional algorithm based on current statistical model. Maneuvering frequency is adjusted in real time by fuzzy reasoning according to the normalized residual and its change rate. Acceleration variance is depicted using residual power function, and the mean value of current acceleration is updated by the deviation between the estimated and predicted values of acceleration. On this basis, the weight of proposed algorithm is revised by Gauss membership function and strong tracking algorithm. Fuzzy adaptive algorithm is not restricted by maneuvering frequency given manually and extreme value of maximum acceleration, which is suitable for the different ranges and degrees of maneuvering.

Study of Diamond Wire Saw Cutting of Carbon Fiber Composite Material

ZHANG Liao-yuan, SHANG Ming-wei, ZHAO Yan, JIANG Da-lin, MA Kang-le

2016, 37(11):  2044-2049.  doi:10.3969/j.issn.1000-1093.2016.11.012

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To study the sawing technology of diamond wire saw cutting carbon fiber composite, the experiments of cutting the carbon fiber composite materials on a diamond wire saw cutting machine tool were performed. The results show that the joint-cutting path of carbon fiber composite material is more perfect under the conditions of lower feed speed and higher wire saw linear speed; the stability of diamond wire saw is higher under the conditions of lower linear speed and higher tension of diamond wire saw; the tangential sawing force decreases with the increase in wire saw linear speed；the normal sawing force increases with the increase in wire saw feed speed; the uneven distribution of diamond abrasive grains , the different thicknesses and clamping positions of the work pieces and the wire saw cutting direction result in the joint-cutting path of carbon fiber composite material being not an ideal straight line.

Experimental Investigation on the Effect of Load Carriage on Soldiers' Gaits during Marching

YANG Yang, WANG Ya-ping, XU Cheng, ZHANG Wei

2016, 37(11):  2050-2057.  doi:10.3969/j.issn.1000-1093.2016.11.013

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The effects of load carriage and its location on soldiers' gaits during marching are investigated. Walking gait of lower limb is measured by 3D motion analysis system, and the plantar pressure is obtained by plantar pressure measurement system. The measured results show that the gait of soldier is affected by load carriage, especially when the load is heavier than 20 kg. Although light load has no influence on soldiers’ subjective feeling, the tests in the present paper show that lighter loads change soldier marching gait, in which uniform weight distribution benefits kinematics of gait.

Research on the Evaluation of Mission Maintainability of Repairable Unit Constitution

HAN Xiao-hai， ZHANG Yao-hui， WANG Shao-hua， CAO Xing-wei

2016, 37(11):  2058-2065.  doi:10.3969/j.issn.1000-1093.2016.11.014

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The traditional mission maintainability evaluation method cannot effectively estimate the overall maintenance time of equipment in specific task profile. An evaluation method which can be used to evaluate the mission maintainability of repairable unit constitution is proposed. During evaluation, the maintenance time probability density function of functional unit is estimated using a Bayesian updating approach, and the maintainability of failure event of repairable unit constitution is calculated in a simulation way. The example analysis shows that the proposed method may not only solve the estimated inaccuracy of maintenance time probability density function of functional unit due to incomplete statistical data, but also calculate the convolution of multiple functions conveniently. The assessed result of mission maintainability is more credible.

Redundant Fault-tolerant Method for Real-time Measurement and Control System of Weapons and Equipment

LI Dan, HU Xiao-guang

2016, 37(11):  2066-2074.  doi:10.3969/j.issn.1000-1093.2016.11.015

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A redundant fault-tolerant issue of a measurement and control system with compact PCI bus is studied to satisfy the requirements for high reliability of real-time measurement and control system. A redundancy design method is constructed, in which a heartbeat detection is used to connect the main and backup devices. And the high available hot-swap technology based on VxWorks real-time system is used to improve the redundant fault-tolerant capability of the system. A real-time fault-tolerance scheduling algorithm based on imprecise computation theory is proposed. The proposed algorithm is used for the measurement and control system to verify its improvement for redundant fault-tolerance. Simulated and experimental results show that the system can satisfy the requirements of redundancy and fault tolerance. The design method can effectively improve the reliability of the system.

Battle Damage Assessment Method Based on BN-Cloud Model

QU Wan-jia, XU Zhong-lin, ZHANG Bo-lin, LIU Ying

2016, 37(11):  2075-2084.  doi:10.3969/j.issn.1000-1093.2016.11.016

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A new damage assessment method based on BN-Cloud model is put forward for the impact of complex and uncertain factors in modern battlefield environment. The characteristics of targets are analyzed, and a hierarchical evaluation index system is established, which is used to build a Bayesian network (BN) structure. Monte Carlo method is introduced into parameter learning, a condition probability table (CPT) of each network node is obtained through simulation, and the probability of each damage level is obtained by using the network inference. Finally, cloud model is used to transform target damage probability into real damage value so as to realize the transformation from uncertainty to certainty. The target physical damage degree is used as one of sub-nodes of functional damage degree in BN, in which CPT is used as a link. As a result, a new method to transform physical damage into function damage is realized. A radar target is taken as an example for simulation. The simulated result shows that the proposed method can be effectively used for target damage assessment, and achieves a significant improvement in accuracy and reliability compared with the existing algorithms.

Weapon-target Assignment with an Improved Multi-objective Particle Swarm Optimization Algorithm

XIA Wei， LIU Xin-xue， FAN Yang-tao， YUAN Feng-gang

2016, 37(11):  2085-2093.  doi:10.3969/j.issn.1000-1093.2016.11.017

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Weapon-target assignment (WTA) with numerous variables in modern campaign is a typical non-deterministic polynomial (NP) complete problem. An optimization model based on improved multi-objective swarm optimization algorithm (MOPSO-II) is established to solve the objective functions of maximum damage probability and minimum ammunition consumption. Since “curse of dimensionality” occurs in the objective swarm optimization algorithm (PSO), the random variable decomposition strategy and cooperative co-evolution evolutionary frame are used for variable decomposition, and also all swarms are composited by using the non-dominated set algorithm in NSGA-II. The simulated results show that MOPSO-II is quicker and more effective than NSGA-II, and can give good WTA quickly, especially when the scale of WTA problem is large.

Propagation Characteristics of Oblique Incidence Air Coupling Ultrasonic Wave in Uniform Elastic Layered Medium

WANG Xing-guo, WU Wen-lin, CHEN Zheng-lin, WU Nan-xing

2016, 37(11):  2094-2100.  doi:10.3969/j.issn.1000-1093.2016.11.018

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The propagation rules of air coupling acoustic wave in uniform elastic layered medium are studied at the different incident angles and testing frequency according to the wave equation. The transfer matrix method and the gas-solid boundary conditions of acoustic wave are used to solve the problem which lacks theoretical support in the application of non-contact ultrasonic test technology in uniform elastic material. A testing method of uniform elastic medium is developed. The stimulated results show that the transmission coefficient distribution presents a form of multimode. The total reflection occurs when the incident angle exceed the critical angle of transverse wave. The incident critical angle decreases with the increase in testing frequency. The cutoff frequency-thickness product increases with the increase in incident angle. The experimental results are in agreement with the numerical results.

Knowledge Service Method for Supporting Product Intellectualized Design

WANG Ru, WANG Guo-xin, YAN Yan, HAO Jia, SHI Xue-hai, MING Zhen-jun

2016, 37(11):  2101-2113.  doi:10.3969/j.issn.1000-1093.2016.11.019

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To solve the problems of computation and reasoning decision in the product intellectualized design and achieve a combination of both, a knowledge service method for supporting product intellectualized design is proposed, which includes the development of knowledge service strategy and the construction of knowledge environment. The design knowledge is divided into four types, i.e. business domain, empirical rule, instance scenario and iteration calculation, by analyzing the features of design knowledge and the relationship between it and design process. A appropriate service strategy is developed for the different types of knowledge, and the formal descriptions of them are given based on knowledge and component templates. An ontology-based semantic modeling process of design knowledge is presented. On this basis, through evaluation and modification of scheme, the design knowledge is integrated into the instance-based reasoning activities, and the automated computation is achieved by tools integration and procedure packaging. A knowledge-based intelligent design system is developed. The proposed method is demonstrated by taking a gun barrel for example. The result shows that the method is effective.

Experimental Research on the Process of Cavitation and Its Influence on the Nozzle of Diesel Engine

QIU Tao, XU Hui, LEI Yan

2016, 37(11):  2114-2119.  doi:10.3969/j.issn.1000-1093.2016.11.020

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The high-speed flow of internal fuel in diesel fuel injector is easy to cause cavitation inside the nozzle, which affects the flow of fuel. It is very important to study the cavitation process of fuel in the nozzle. The flow characteristics of the nozzle under different inlet and outlet pressures is studied by experiments on the scale-enlarged visualization test bench. The experimental results show that the inlet pressure is constant, with the decrease in the outlet pressure, 1) during the no cavitation period, the discharge coefficient is basically unchanged; 2) during the cavitation developing period, cavitation becomes stronger and develops from the entrance of the nozzle to the outlet, the mass flow rate continues to increase and the discharge coefficient decreases; 3) during the cavitation saturation period, the mass flow rate maintains stable but the discharge coefficient continues decreasing. The inlet pressure of the nozzle does not affect the critical cavitation number of cavitation inception and cavitation saturation. The diameter of the nozzle does not affect the point of cavitation inception, but the point of cavitation saturation; as the diameter of the nozzle is larger, the more difficult it is to achieve the cavitation saturation, and the smaller of the critical cavitation number. The length of the nozzle affects the point of cavitation inception and cavitation saturation; the length of the nozzle is longer, the more difficult it is to occur cavitation and to achieve cavitation saturation, the critical cavitation numbers of both the cavitation inception and the cavitation saturation are smaller.

Evaluation of Target Circuit Realized on Embryonics Array with Faulty Cells

ZHU Sai, CAI Jin-yan, MENG Ya-feng, LI Dan-yang, PAN Gang

2016, 37(11):  2120-2127.  doi:10.3969/j.issn.1000-1093.2016.11.021

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The elimination-evolution self-repair method can be used to increase the self-repairing capacity of target circuit by optimizing circuit structure. There has been little research on the target circuit evaluation in optimization process. Based on the mathematical description of embryonics array state and target circuit form, an evaluation method is proposed with Markov unrepairable system theory. The calculating method for state division, transition rate of state, and probability of working states is researched, and the reliability and mean time-to-failure of target circuit are calculated to evaluate the target circuit. The simulated and experimental results show that the proposed method can effectively evaluate the circuit forms in evolution process.

Coupled Motion Analysis of Finite Ribbed Plate Based on Traveling Wave Approach

CHEN Pan， QI Qiong-fang

2016, 37(11):  2128-2135.  doi:10.3969/j.issn.1000-1093.2016.11.022

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Traveling wave method and modal superposition method are used to study the coupled motion characteristics of plate and added ribs. According to the coupled continuity hypothesis of plate and rib, three kinds of coupling model, i.e., plate-additional mass model, plate-Euler beam model and plate-plate-Euler beam model, are established. The three coupling models correspond to blocking mass, flat steel and T-shaped plate, respectively. The dynamic response of finite plate is derived based on the traveling wave method. A self-compiled Matlab program is applied to calculate the vibratory response. The traveling wave method is verified to be an effective approach to calculate the coupled structure by comparing the numerical result of the finite element method with the calculated result of the traveling wave method. The coupling models with three different ribs are compared and analyzed. According coupled continuity assumption, the effect of structural rigidity on response is investigated. In low frequency range, the structural stiffness has less effect on dynamic response. As frequency increases, the impact of structural stiffness on dynamic response increases. The impacts of thickness and loss factor on vibration are analyzed. The results show that, with the increase in plate thickness, the modal number of plate is reduced. In the nearby regions of the resonant frequencies, the peaks of input power and transmission power are decreased with the increase in loss factor. The loss factor has less effect on the natural frequency of structure.

Research of Holon Multi-resolution Modeling in Battle Deduction System

HAN Hong， KANG Feng-ju， WANG Sheng-jie

2016, 37(11):  2136-2147.  doi:10.3969/j.issn.1000-1093.2016.11.023

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Battle deduction is an important means of weapon system effectiveness evaluation study, and multi-resolution modeling is a research hotspot of battle deduction system technology. Since the existing aggregation-disaggregation and viewpoint selection multi-resolution modeling methods are lack of the description of hierarchy between models, and difficultly realize the adaptive resolution transformation of models while the system is running, they cannot balance model accuracy and system load. For the above issues, Holon concept is introduced, and a new Holon multi-resolution modeling method is proposed. The organization structure and formal description of Holon multimulti-resolution model is studied, the rules of the structure evolution are presented, an adaptive resolution transform mechanism based on satisfaction is proposed, and software running architecture and critical services to support Holon multi-resolution modeling are designed. The Holon multi-resolution modeling method is used for battle deduction system of naval weaponry and equipment. The proposed method is verified to keep the consistency between the models and effectively reduce the load of system by comparing the aggregation-disaggregation method and the viewpoint selection method.

Research Notes

Numerical Analysis of Influence of Rifling Structure of Large Caliber Gun on Moving of Projectile with Sliding Driving Band in Bore

XU Yao-feng， DING Hong-min， XU Jian， NING Bian-fang

2016, 37(11):  2148-2156.  doi:10.3969/j.issn.1000-1093.2016.11.024

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A projectile-barrel coupled system of large caliber gun for launching a guided projectile with sliding driving band is studied. A guided projectile-barrel coupled dynamic finite element model of some large caliber gun is established based on elastic and plastic finite element theory. The projectile stress, squeezing resistance, and dynamic response between projectile and barrel in the process of projectile squeezing into rifling grooves and the process of straight moving of guided projectile in bore considering increased twist rifling, uniform twist rifling and increasing-uniform combined rifling, as well as deep rifling and shallow rifling are calculated. The relationship between the rifling structure of large caliber gun and the motion of guided projectile in bore is obtained.

Design of High Isolation and Compact Transmitting/receiving Antennas for Fuze

ZHAO Wei， ZHANG Hao-jun， WANG Song-jie

2016, 37(11):  2157-2162.  doi:10.3969/j.issn.1000-1093.2016.11.025

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In order to solve the high isolation of fuze transmitting/receiving (T/R) antennas for a small calibre air- to-air missile, the feedforward and feedback antennas based on slotted waveguide array are presented, and the dislocation layout of transmitting/receiving antenna is used. The test results show that the feedforward and feedback antennas achieve a funneled radiation pattern, and the isolation of transmitting/receiving antennas throughout 1 GHz bandwidth is less than -80 dB which is improved by about 11 dB compared with the regular antenna layout. The design and layout of antennas meet the requirements of high isolation and compact configuration.

Adaptive Scheduling Algorithm over Comprehensive Priority for Phased Array Radar

ZHANG Hao-wei, XIE Jun-wei, SHENG Chuan

2016, 37(11):  2163-2169.  doi:10.3969/j.issn.1000-1093.2016.11.026

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The high efficient time resource allocation in the phased array radar is the key to optimize its superiorities. A novel scheduling algorithm is proposed, which considers the threat level of targets. The nonlinear quantitative model of target threat level and the task deadline are mapped to the same layer to calculate the task comprehensive priority by designing the two-dimensional priority table. In the performance evaluation of the algorithm, the conception of executive threat rate is presented to reflect the execution of scheduling algorithm on the important tasks. The simulated results show that the proposed algorithm effectively decreases the deadline missing ratio of tasks, and improves the time utilization ratio and the executive threat rate compared with the previous high efficient priority algorithm in the saturated tracking task situation.

Modified Zero-Attracting l₀-NLMS Algorithm

GUAN Si-hai， LI Zhi, HUANG Hui, WANG Zhe

2016, 37(11):  2170-2176.  doi:10.3969/j.issn.1000-1093.2016.11.027

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A new zero-attracting variable step size l₀-NLMS algorithm is proposed for recognition of sparse system. Step size of l₀-NLMS algorithm is changed by the versiera function. The convergence and convergence conditions, and the mean square error (MSE) and mean square deviation (MSD) of the proposed algorithm are derived. Simulation experiments with different signal-to-noise ratios (SNR) and different levels of autocorrelation of input signal are performed to compare the step size and MSD. The experimental simulation results show that the proposed algorithm can achieve faster convergence rate and good performance of pattern recognition even when the input signal is correlated, and can identify the sparse systems effectively.