干式空芯限流电抗器的优化设计

干式空芯电抗器采用多个并联包封式结构形式,如何设计出合理的包封个数、包封尺寸、包封内导线层数以及如何选取导线线径便成了一个问题。利用优化设计得到的干式空芯限流电抗器结构合理、耗材最少,并就优化设计的具体问题进行了实际解决。     

测真空二极管强电子束流的同轴分流器

本文介绍了一种结构紧凑,安装在阳极座中,测量真空二极管内阴阳极间电子束流的同轴分流器,经定标此分流器的电阻为ZmΩ,响应时间为3．2ns。已用它测量81-7M－01强流相对论电子束加速器二极管的电子束流,测得的束流强度为90kA左右。此同轴分流器结构简单,易于使用,在研究阴阳极的材料和形状对二极管束流的影响等方面有潜在的应用价值。     

The incentive effect of acceptance sampling plans in a supply chain with endogenous product quality

This article studies a firm that procures a product from a supplier. The quality of each product unit is measured by a continuous variable that follows a normal distribution and is correlated within a batch. The firm conducts an inspection and pays the supplier only if the product batch passes the inspection. The inspection not only serves the purpose of preventing a bad batch from reaching customers but also offers the supplier an incentive to improve product quality. The firm determines the acceptance sampling plan, and the supplier determines the quality effort level in either a simultaneous game or a Stackelberg leadership game, in which both parties share inspection cost and recall loss caused by low product quality. In the simultaneous game, we identify the Nash equilibrium form, provide sufficient conditions that guarantee the existence of a pure strategy Nash equilibrium, and find parameter settings under which the decentralized and centralized supply chains achieve the same outcome. By numerical experiments, we show that the firm's acceptance sampling plan and the supplier's quality effort level are sensitive to both the recall loss sharing ratio and the game format (i.e., the precommitment assumption of the inspection policy). © 2013 Wiley Periodicals, Inc. Naval Research Logistics, 2013     

自适应交互多模型火控跟踪算法

以舰载近程防空火控系统的跟踪预测为背景,提出一种自适应的交互式多模型跟踪算法,模型集合取为"当前"统计模型和匀速直线模型.该算法采用后验估计的方法在线辩识及自适应调整上述两个模型的噪声方差,并且采用加权系数限定准则,实现机动目标运动模式与模型集合的自适应.仿真计算证明了该模型算法的有效性.     

适用于海底观测网络的恒流远供系统可靠性分析方法

以水下单元的短路/开路故障模式为基础,提出一种分析缆系海底观测网络恒流远供系统可靠性的方法。根据系统供电和结构特性,将系统分成不同的供电链路和链路段。详细研究处于不同位置的各种水下单元发生故障时,对链路和观测设备的供电状态的影响。归纳导致系统和各链路无法正常导通、观测设备无法得到供电的状态情况,分析不同故障状态发生的概率,进而得出求解系统、供电链路与供电设备的供电可靠度的方法。通过算例分析,进一步梳理了3种供电可靠性的共性规律,说明在设计和建设恒流远供系统时,应综合考量这3种供电可靠性。     

一种10kA零磁通霍尔电流传感器的设计与仿真

采用线圈分段绕制的方法,设计了一种10kA量程的零磁通霍尔电流传感器以及相应的驱动电路,有效地将驱动电压降为±15V,并利用电磁场仿真验证了线圈分段设计的可行性。同时,提出了铁芯线圈以及霍尔元件的等效电路仿真方法,并以此为基础在Multisim中搭建了零磁通霍尔传感器系统的电路仿真模型,通过对各种电流波形进行仿真验证,证明了该设计的合理性。     

基于“当前”统计模型的机动目标自适应跟踪算法

针对"当前"统计模型对加速度极值及机动频率需人为设定的缺陷,提出了一种基于滤波残差的高斯型隶属度函数改进算法,该法在跟踪过程中对加速度极值进行自适应调整。引入一种基于残差的Sigmoid二次型隶属度函数,通过自适应改变机动频率,使模型趋于目标真实状态。理论分析和仿真结果表明,改进的模型避免了人为引入误差,提高了机动目标的跟踪精度,算法简单,易于工程实现。     

基于非入侵式负荷小区用电设备监测技术

加强用电设备能耗的监测是我国提高电能利用率、实现能源可持续发展、建设节约型社会的重要手段。通过对国内外用电设备监测技术和方法的研究,以及对几种常用用电设备识别方式、原理和优缺点的比较,提出了一种基于非入侵式负荷的谐波电流面积监测技术。采用该技术对小区用电设备进行Matlab仿真,并对仿真结果进行分析和验证。结果证明该技术能提高用电设备的识别精度和能耗监测效率,对减少小区经济损失、提高电力系统稳定性、实现能源可持续发展具有一定的意义。     

Designing acceptance sampling schemes for life testing with mixed censoring

Mixed censoring is useful extension of Type I and Type II censoring and combines some advantages of both types of censoring. This paper proposes a general Bayesian framework for designing a variable acceptance sampling scheme with mixed censoring. A general loss function which includes the sampling cost, the time‐consuming cost, the salvage value, and the decision loss is employed to determine the Bayes risk and the corresponding optimal sampling plan. An explicit expression of the Bayes risk is derived. The new model can easily be adapted to create life testing models for different distributions. Specifically, two commonly used distributions including the exponential distribution and the Weibull distribution are considered with a special decision loss function. We demonstrate that the proposed model is superior to models with Type I or Type II censoring. Numerical examples are reported to illustrate the effectiveness of the method proposed. © 2004 Wiley Periodicals, Inc. Naval Research Logistics, 2004     

电晕放电若干特性的实验研究

为研究空中带高压物体的电晕放电辐射信号特征,采用组建的静电放电测试系统对电晕电流及其辐射信号进行了实验研究。实验表明：电晕放电脉冲波形具有明显的极性效应。负极性下先发生电晕放电,且电流波形的上升时间小于正电晕电流;电晕放电信号波形前沿陡峭,上升时间从几个ns到二十几个ns;电晕放电辐射信号的频谱成钟型连续谱,其频率范围主要集中在20～100MHz之间;极性不同,电晕放电辐射信号波形不同,并且正电晕信号幅值高于负电晕信号幅值。