滑坡稳定性的模糊综合评价

渝东南地区地表崎岖,多崇山峻岭,沿江河冲沟发育,为滑坡、泥石流等不良地质现象提供了天然条件.以庙堡坪古滑坡为例,运用模糊综合评价方法,从地貌形态、地层岩性、地质构造、滑体密实度、水文地质条件5个方面,分为2个层次,共7个因子建立了滑坡稳定性评价的模糊综合评判模型,确定了各因素等级标准和权重,根据最大隶属度原则,得出水库蓄水后该滑坡稳定性较差的结论,并提出了相应的工程处理措施.     

基于T-S模糊模型的网络化控制系统的鲁棒容错控制

针对一类具有马尔可夫特性时延的非线性网络化控制系统,在建模的时候使用基于时延的准T-S模糊模型。当传感器和执行器发生故障失效的时候,由于系统的参数具有不确定的特征,分别构造了与时延概率分布相关的lyapunov泛函,设计了相应的容错控制器,并证明了该系统具有鲁棒完整性的充分条件。最后通过实例仿真对理论的有效性进行验证。     

基于两级Smith预估的纯滞后系统串级模糊控制仿真

在工业过程中,纯滞后系统普遍存在.针对副回路中含有纯滞后的串级控制系统,对典型的PID串级控制系统加以改进,提出基于主副回路Smith预估补偿的串级模糊控制方法,在主副回路分别加入Smith预估器,并利用模糊控制器为主调节器.仿真结果表明,该种控制方法相比传统的PID串级控制方法具有更优的动态特性和鲁棒性.     

Application of fuzzy analytic hierarchy process and neural network in power transformer risk assessment

In operation, risk arising from power transformer faults is of much uncertainty and complicacy. To timely and objectively control the risks, a transformer risk assessment method based on fuzzy analytic hierarchy process (FAHP) and artificial neural network (ANN) from the perspective of accuracy and quickness is proposed. An analytic hierarchy process model for the transformer risk assessment is built by analysis of the risk factors affecting the transformer risk level and the weight relation of each risk factor in transformer risk calculation is analyzed by application of fuzzy consistency judgment matrix; with utilization of adaptive ability and nonlinear mapping ability of the ANN, the risk factors with large weights are used as input of neutral network, and thus intelligent quantitative assessment of transformer risk is realized. The simulation result shows that the proposed method increases the speed and accuracy of the risk assessment and can provide feasible decision basis for the transformer risk management and maintenance decisions.     

Designing similarity measurement with distance measure and application on laterally directional mode flight test

Similarity measure construction has been proposed as fault detection of flight test method in order to obtain the primary control surface stuck and the combination stuck of primary control. Similarity measures were obtained through analyzing the certainty and uncertainty of fuzzy membership functions, which were designed based on well-known Hamming distance. It was applied to the fault detection of primary control surface stuck of uninhabited aerial vehicle (UAV). At post-failure control surface, if the UAV is controllable and trimmable using other control surfaces, the UAV is able to fly or return to the safety region through reconfiguration of flight control system. To detect the fault, similarity measure computations were carried out. This result could be applicable with the real-time parameter estimation method. By monitoring the value of coefficients due to the control surface deviation, it becomes aware that the control surface fault occurs or not. The control surface stuck position and value were separated by comparing the trim value with the reference value. This is the advantage of increasing in reliability without adding sensors or with additional low cost.     

基于模糊PID的锂电池极片卷绕设备张力控制

锂电池极片卷绕设备卷绕过程中,控制好张力对卷绕的顺利进行、产品质量的保证起到关键的作用。文章以张力为对象,对锂电池极片卷绕设备控制系统进行设计,并将模糊自适应PID算法应用于张力控制系统。仿真结果表明,加入模糊自整定PID后系统稳定误差基本消除,系统响应时间和系统超调量明显减少,系统响应速度和控制精度有很大的改善,张力也稳定控制。     

基于参数自整定的模糊智能供水策略

针对一次性整定的PID参数难以保证供水控制系统的控制效果始终处于优化状态的问题,提出了一种基于参数自整定的模糊智能供水策略。采用该策略系统一旦偏离正常状态,在系统性能超过容许范围时,自动启动PID参数的整定过程进行在线参数模糊自整定,按照整定后的PID参数系统自动切换到正常工作状态。重新整定的PID参数可使供水系统达到更好的控制品质。仿真实验表明:实时修改控制器的参数可以保证控制系统具有优良的控制品质。     

激光角度欺骗仿真系统的软件可靠性指标分配

在激光角度欺骗仿真系统的需求分析和概要设计阶段,使用基于模糊故障模式、影响及危害性分析(FMECA)框架的分配法对该系统软件可靠性分配。首先建立影响因素集、评价集合;然后基于FMECA框架进行模糊综合评价;再利用层次分析法(AHP)得到权重集;最后通过量化手段得到各子系统的不可靠系数并将它们转化为平均无故障时间(MTBF)。最终得到的可靠性指标符合专家评估和类似软件系统的可靠性分配结果。     

装备科研生产军民融合度模型研究

科学分析装备科研生产军民融合度是分类制定军民融合政策法规的依据。界定了装备科研生产军民融合度的概念,从装备科研生产可竞争程度、装备所处的层次和阶段分析了影响装备科研生产军民融合度的影响因素,构建了基于模糊Petri网的装备科研生产军民融合度模型,并进行了案例验证;在此基础上,根据不同情形的军民融合度给出了相应的对策建议。