基于IITFN的模糊矩阵博弈最优策略研究

由于矩阵博弈支付函数具有模糊性,本文依据区间直觉梯形模糊数(IITFN)的基本理论,用区间直觉梯形模糊数来表示模糊矩阵博弈(FMG)支付函数;基于得分函数与精确函数提出了区间直觉梯形模糊矩阵博弈(IITFN-FMG)的策略最优解的求取方法。通过实例仿真,结果表明:以区间直觉梯形模糊数表示支付函数来分析最优策略如何选取,其效果更好,与实际情形的吻合程度亦更为理想。     

Performances of RETGEM with resistive electrodes made of kapton foils

THGEM with resistive Kapton electrodes (RETGEM) has been developed to make the THGEM more tolerant to discharges. At higher gains with resistive electrodes, serious discharges may travel to the streamer mode, in contrast to violent sparks in conventional GEMs. These streamers are mild and less dangerous to the detector and the front-end electronics. RETGEM looks very promising, and its basic properties are being studied. Recently we developed and tested the THGEM with electrodes using 20 um thick resistive kapton foils. The new RETGEM performs at a lower discharge current, has a lower discharge probability, and has a good energy resolution of 27% and a high effective gas gain and long-term stability.     

某型光电跟踪系统伺服控制器建模与仿真

以某型地空导弹为背景,采用视觉伺服技术,设计了光电跟踪系统的伺服控制器;系统采用半闭环结构。通过控制对象的分析选择了永磁式直流电机作为执行机构,并建立数学模型;设计了电流环反馈,保证系统的快速响应,并可对电机进行过流保护;位置环采用串联超前校正和PA放大器;通过Bode图分析,本系统符合要求;仿真分析结果表明,本系统具有响应快、超调小等特点,并能够快速平稳的跟踪低频运动的目标。     

Mg-3Al-0.4Si镁合金的高温磨损行为研究

在20~200℃温度下,利用销盘式磨损试验机研究Mg-3Al-0.4Si合金的磨损行为,评价载荷和温度对磨损速率的影响.应用扫描电子显微镜观察磨损表面形貌以确定高温下的磨损机制,通过光学显微镜观察磨损亚表层组织演变,然后采用显微硬度计测量硬度变化.研究结果表明:随着磨损温度提高,Mg-3Al-0.4Si合金的磨损率随载荷增加而上升的趋势更为明显.其磨损行为可分为轻微和严重磨损,增加磨损温度显著降低轻微-严重磨损转变载荷.轻微-严重磨损前后的亚表层组织和硬度变化表明,摩擦热诱发磨损亚表层发生动态再结晶(DRX)组织转变引起的热软化是造成轻微-严重磨损转变的主要原因.