Rough Set Fuzzy Optimum Selecting in Multidisciplinary System

Scheme evaluation and selection is an optimum selecting and sequencing problem with multi-objective and multilevel. It can＇t follow single objective function or rule. Meanwhile, these objectives are coupled with each other and the attribution information is fuzzy also. It is necessary to find an effective evaluation method which can consider all conditions and restrictions. In this paper, AHP and rough set theory are applied to fuzzy optimization to determine important weight of each attribution. The rough set fuzzy optimum selection is used to eliminate the useless information. Autonomous un- derwater vehicle （AUV） is large-scale systems with many coupled design variables and objective functions. Their scheme evaluation and selection are very important, which relate to multiple factors, such as reliability; security, service time; the lifecycle, etc. Results of application in torpedo design indicate that this method is feasible.     

Study on Design and Safety Evaluation Methods of Mechanical-Thermal Weak-Link

In an abnormal high-temperature fire environment,a structure with mechanical-thermal weak-link can be used to predict the permanent failure before the failure of some strong-links,such as explosive initiator,thus to protect the latter. An effective design can be defined as that the weak-link fails before the failure of the strong-link,and the system is safe; while an unsuccessful design means that the weak-link fails after the failure of the strong-link,and the system loses in safety. The probability of safety failure exists due to the uncertain failure temperatures of the weak-link and strong-link. In order to obtain the probability of safety failure,a statistical method was used to deal with the uncertainty of the failure temperatures. The integral method and stochastic simulation method were used in calculations. Finally,a sample was given to verify the consistence of the results given by two methods.     

Structural Optimization of Machine Gun Based on Dynamic Stability Concept

Improving the firing accuracy is a final goal of structural optimization of machine guns. The main factors which affect the dispersion accuracy of machine gun are analyzed. Based on the concept of dynamic stability, a structural optimization model is built up, and the sensitivity of dispersion accuracy to design variables is analyzed. The optimization results of a type of machine gun show that the method is valid, feasible, and can be used as a guide to the structural optimization of other automatic weapons.     

Fuzzy Jamming Pattern Recognition Based on Statistic Parameters of Signal＇s PSD

In order to recognize the jamming pattern in anti-jamming, a novel fuzzy jamming recognition method based on statistic parameters of received signal’s power spectral density (PSD) is proposed. It exploits PSD’s shape factor and skewness of received signal as classified characters of jamming pattern. After the mean center and variance of each jamming pattern are calculated by using some jamming samples, an exponential fuzzy membership function is used to calculate the membership value of the recognized sample. Finally, the jamming pattern of received signal is recognized by the maximum membership principle. The simulation results show that the proposed algorithm can recognize common eight jamming patterns accurately.     

Dynamic Study on Rigid and Flexible Coupling System for Terminally Sensitive Submunition

A kinetic model of the rigid and flexible coupling system for terminally sensitive submunition is set up with Kane＇s method. The parachute is considered as a flexible body, the flexible displacement is expressed with modal spread method, the position of the parachute is expressed with a hybrid coordinate method, and the kinematics of the terminally sensitive submunition is analyzed. Ten generalized coordinates relative to the attitude of the terminally sensitive submunition are chosen, and the correlative generalized active forces, the generalized inertial forces, the generalized internal forces are calculated in turn. On the base of the Kane＇s method, the ten degrees of freedom dynamic equations for the coupled terminally sensitive submunition are finally set up. This model can be used to expediently simulate and analyze accurately the exterior ballistic trajectory of terminally sensitive submunition, and provide the overall design of the terminally sensitive submunition with some helpful references.     

Modeling of Testability Requirement Based on Generalized Stochastic Petri Nets

Testability design is an effective way to realize the fault detection and isolation. Its important step is to determine testability figures of merits （TFOM）. Firstly, some influence factors for TFOMs are analyzed, such as the processes of system operation, maintenance and support, fault detection and isolation and so on. Secondly, a testability requirement analysis model is built based on generalized stochastic Petri net （GSPN）. Then, the system＇s reachable states are analyzed based on the model, a Markov chain isomorphic with Petri net is constructed, a state transition matrix is created and the system＇ s steady state probability is obtained. The relationship between the steady state availability and testability parameters can be revealed and reasoned. Finally, an example shows that the proposed method can determine TFOM, such as fault detection rate and fault isolation rate, effectively and reasonably.     

Design Method of Equipment Optimization Development Based on Standardization Theory

The matters of equipment optimization development are usually discrete, fuzzy and non-quantitative. It is difficult directly to optimize the equipment development with a mathematical model. A set of methods for designing the equipment optimization development with six di- mensions and eight main elements is established based on the theory and method of standardization. The top-tier design space of systematic development of equipment is built up by the relations of basic models, series and model spectrums. The relations of time and space for equipment optimization development are established. The design processes of a six dimension systematic space are expounded. The connotation of each plan in the main system space is analyzed. A design method for an entire equipment is established with standardization theory. The coordinating design methods of equipment technical system and the optimization design methods of equipment integration are discussed. The design methods for universalization and serialization of components and parts are established. The design methods of equipment optimization development highlight the relations of the basic model of platform, the serialization of platform basic models, the modularization of equipment functions, the model spectrum of variant equipment, and the universalization and serialization of components and parts.     

Quantitative Testing of Defect for Gun Barrels

The magnetic flux leakage （MFL） method is commonly used in the nondestructive evaluation （NDE） of gun barrels. The key point of MFL testing is to estimate the crack geometry parameters based on the measured signal. The analysis of magnetic leakage fields can be obtained by solving Maxwell＇s equations using finite element method （FEM）. The radial component of magnetic flux density is measured in MFL testing. The peak-peak value, the separation distance between positive and negative peaks of signal and the lift-off value of Hall-sensor are used as the main features of every sample. This paper establishes the multi-regression equations related to the width （the depth） of crack and the main characteristic values. The regression model is tested by use of the magnetic leakage data. The experimental results indicate that the regression equations can accurately predict the 2-D defect geometry parameters and the MFL quantitative testing can be achieved.     

Research on Performance of U Separator in Sand and Dust Test System

Sand/dust test is one of the key projects to examine the environmental adaptability of ordnance equipment.In order to decrease the abrasion of test facility caused by the sand/dust particles,the particles contained in the airflowneed to be reclaimed effectively.Amathematical model of Useparator is established.The flowfield and the trajectories of particles inside the separator are obtained using a numerical simulation method,and the separation efficiency and pressure drop of separator with different rows of separate components are also obtained at various flowvelocities.The simulation results indicate that the efficiency of U inertia separator is affected by the flowvelocity evidently,and a reasonably designed separator can meet the requirement of the separation efficiency in particular situation.The results can be use as reference for the design and test of sand/dust separate systems.     

Minimum Curvature Design of turbine Hydrodynamic Three-Element Centripetal- Torque Converters

The influence of streamline bending inertia force on power loss is investigated. In order to analyze the combined effect of the inertia force and the path on the power loss, the accumulation effect expression of the inertia force on its path is derived. The calculation result shows that the accumulation effect of the unit inertia force on its path depends merely upon the velocity magnitude and the path scroll angle. As long as they are given, the accumulation effect is a constant and independent of the intermediate path. An important conclusion drawn is that the maximum inertia force rather than its ac- cumulation effect plays a predominant role in the power loss. Thus, a new design method, minimum streamline curvature method, is proposed. Fluid particle movement inside a hydrodynamic torque converter can be regarded as curved move- ment on the circular surface and decomposed into a meridional component and a circumferential component. Each merid- ional streamline is designed to be close to a circular arc, while each torus streamline is constructed with a circular arc and a straight line segment. Based on the meridional streamline equation, the torus streamline equation and a streamlined thickness function, a blade surface equation of three-element centripetal-turbine hydrodynamic torque converter can be obtained.     

环境因素对产品贮存寿命影响的模糊确定方法

长期贮存产品的性能主要受贮存环境的影响,合理估算环境因素对贮存寿命的影响可为确定贮存寿命、改善贮存环境措施以及提高贮存可靠性设计水平等提供科学依据.基于贮存环境的模糊性特点,提出用三角模糊数表示不同贮存时刻环境温度和湿度的变化情况,建立模糊温度和湿度模型,并用实际数据例进行模型验证.与常规定值环境计算法相比,文中方法较接近于实际情况.     

火工品可靠性的模糊故障树分析与计算

把火工品失效看作一个由元器件的性能参数发生模糊失效的模糊系统，对火工品的可靠性进行了模糊故障树分析与计算．以某电雷管为例，通过对该电雷管各性能参数发生模糊失效的因素进行分析，给出了性能参数不满足指标要求的可能性分布及其失效概率的可能性分布；据此，建立了该电雷管失效故障树，通过计算给出了其模糊失效慨率和模糊可靠度的可能性分布，对其可靠性进行了模糊评估，评估结果与实际符合较好，表明该分析方法合理、可行。     

滑模控制的模糊趋近律设计

为了削弱滑模控制的颤振现象, 提出了模糊趋近律的方法, 即利用模糊控制器实时地调整滑模控制的趋近律参数.该方法既保证了控制系统的快速性和鲁棒性, 又能够有效地削弱颤振.另外, 控制系统设计简单, 便于工程应用.最后, 以某型导弹为例进行了仿真研究, 仿真结果证明了所提出的方法的有效性.     

神经网络和模糊系统的融合技术及其在引信中的应用

简单介绍了神经网络和模糊系统的主要特点和差异,描述了如何根据它们的各自优点与不足来进行融合：其一,利用神经网络来自动设计模糊系统;其二,利用模糊规则结构构造神经网络系统。提出了在成像引信飞机图象识别中,如何利用神经网络和模糊系统的融合技术构造一个模式分类器,来有效地对复杂弹目交会条件下的飞机红外图象进行分类。     

基于区间对偶犹豫模糊熵的反辐射无人机目标威胁评估

针对属性权重未知且评价信息以区间对偶犹豫模糊数形式给出的反辐射无人机目标威胁评估问题,研究 一种基于区间对偶犹豫模糊熵的TOPSIS 决策方法。给出区间对偶犹豫模糊熵的公理化定义,构造区间对偶犹豫模 糊熵公式求解属性权重,进一步利用TOPSIS 法对方案进行威胁评估,并通过实例进行验证。结果表明：该方法能 增加权重的科学性,提高评估的准确性,进一步丰富模糊多属性决策理论。     

机器鱼水球比赛中精确与模糊协作顶球策略

为使机器鱼的顶球兼备精确性以及在鱼脱离预定轨道的情况下尽可能使水球朝有利于我方进攻方向偏离,提出一种精确与模糊协作的顶球策略。在分析以往顶球算法的基础上,设计一种以水球与目标点连线为基准的区域划分,综合考虑理想情况以及水中各种复杂因素影响后的鱼、球以及目标点的相对位置和几何关系,合理组合路径规划算法和动作决策算法,并以实例在符合路径规划条件和不符合路径规划的条件下进行测试。实验结果表明：该算法能最大限度地利用机器鱼目前所处的环境,使机器鱼的顶球兼备精确性和模糊性。     

密闭容腔气体压力的自适应模糊PID控制

密闭容腔的气体压力控制系统本质上是非线性系统,很难建立精确的数学模型,采用自适应模糊PID控制,通过模糊控制在线调整PID的参数,使系统具有适应性强、鲁棒性好的优点,同时达到较高的控制精度.     

基于模糊逻辑的人为差错概率量化方法

为满足人机系统概率风险评估的需要,提出一种人为差错概率量化方法。分析技能、规则和知识为基础 (skill, rule and knowledge-based,SRK)框架和行为模式的确定方法Hanaman 决策树法,指出在确定行为模式的过程 中考虑行为模式影响因素的不确定性是必要的;使用模糊逻辑方法处理行为模式各个影响因素的不确定性,根据 Hanaman 决策树构建模糊推理规则,利用系统人为行为可靠性程序(systematic human action reliability procedure, SHARP)方法所提供的人为差错概率区间确定人为差错概率的隶属度函数。结果表明：该方法考虑了任务场景的不确 定性,可以得到人为差错概率的精确值,满足人机系统概率风险评估的需要。     

一种基于模糊层次分析的多Agent电子对抗装备状态智能评判方法

针对电子对抗（ECM）装备技术特点和保障决策现状,设计了一种基于模糊层次分析（FAHP）的多Agent ECM装备状态智能评判方法。分析装备服役状态的影响因素,并构建影响因素层次指标体系;通过模糊德尔菲法构建FAHP三角模糊数互补判断矩阵,计算各因素模糊权重;进而依据可能度模型,以一种基于三角模糊数权重向量的排序方法对其服役状态进行模糊综合评判。在此基础上构建了基于多Agent的状态智能评判系统,给出其系统结构、工作流程和实现技术。研究方法克服了传统保障决策模型对装备运行历史数据的严重依赖,为制订装备保障计划提供一种新思路。     

一类非线性系统的模糊输出反馈控制

简单介绍了T-S模糊模型, 基于T-S模糊模型给出了一类非线性系统的模糊模型.论述了非线性系统模糊输出反馈控制, 在满足假设的一定条件下, 这些方法和模糊算法能有效处理某类定义不完善或难以精确建模的控制过程.