THE CREEP-DAMAGE MODELING CORRELATED TO TEMPERATURE FOR COMPOSITE SOLID PROPELLANT

ＴＨＥＣＲＥＥＰ－ＤＡＭＡＧＥＭＯＤＥＬＩＮＧＣＯＲＲＥＬＡＴＥＤＴＯＴＥＭＰＥＲＡＴＵＲＥＦＯＲＣＯＭＰＯＳＩＴＥＳＯＬＩＤＰＲＯＰＥＬＬＡＮＴＳｈｅｎＨｕａｉｒｏｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＡｅｒｏｓｐａｃｅＴｅｃｈｎｏｌｏｇｙ,１０８Ｌａｂｏ...     

THE DETERMINATION OF THE DEFLECTION OF VERTICAL USING INERTIAL SURVEYING SYSTEM

ＴＨＥＤＥＴＥＲＭＩＮＡＴＩＯＮＯＦＴＨＥＤＥＦＬＥＣＴＩＯＮＯＦＶＥＲＴＩＣＡＬＵＳＩＮＧＩＮＥＲＴＩＡＬＳＵＲＶＥＹＩＮＧＳＹＳＴＥＭＷａｎｇＷｅｉ（ＤｅｐａｒｔｍｅｎｔｏｆＡｕｔｏｍａｔｉｃＣｏｎｔｒｏｌ,ＮＵＤＴ,Ｃｈａｎｇｓｈａ,４１００７...     

DETECTION OF TRANSIENT SIGNAL USING THE DISCRETE WAVELET TRANSFORM

ＤＥＴＥＣＴＩＯＮＯＦＴＲＡＮＳＩＥＮＴＳＩＧＮＡＬＵＳＩＮＧＴＨＥＤＩＳＣＲＥＴＥＷＡＶＥＬＥＴＴＲＡＮＳＦＯＲＭＬｉｕＺｈｅｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＩｎｆｏｒｍａｔｉｏｎＥｌｅｃｔｒｏｎｉｃｓ,ＦａｃｕｌｔｙｏｆＥｎｇｉｎｅｅｒｉｎｇ,Ｎａ...     

AN UNIFIED METHOD AND THEORY FOR GRAMMAR DESIGN OF A CLASS OF CONTEXT-SENSITIVE LANGUAGES

ＡＮＵＮＩＦＩＥＤＭＥＴＨＯＤＡＮＤＴＨＥＯＲＹＦＯＲＧＲＡＭＭＡＲＤＥＳＩＧＮ　ＯＦＡＣＬＡＳＳＯＦＣＯＮＴＥＸＴ－ＳＥＮＳＩＴＩＶＥＬＡＮＧＵＡＧＥＳＬｉＺｈｏｕｊｕｎ;ＣｈｅｎＨｕｏｗａｎｇ;ＬｉＫａｎ（ＤｅｐａｒｔｍｅｎｔｏｆＣｏｍｐｕｔｅｒ...     

MEASUREMENT OF PLASMA POTENTIAL USING EMISSIVE PROBE IN A MAGNETIC MIRROR

ＭＥＡＳＵＲＥＭＥＮＴＯＦＰＬＡＳＭＡＰＯＴＥＮＴＩＡＬＵＳＩＮＧＥＭＩＳＳＩＶＥＰＲＯＢＥＩＮＡＭＡＧＮＥＴＩＣＭＩＲＲＯＲＺｈａｎｇＪｉａｎｄｅ（ＤｅｐａｒｔｍｅｎｔｏｆＡｐｐｌｉｅｄＰｈｙｓｉｃｓ,ＮＵＤＴ,Ｃｈａｎｇｓｈａ,４１００７３）Ｆａ...     

INTELLIGENT DECISION ALGORITHM FOR FAULT DETECTION AND ITS APPLICATION

ＩＮＴＥＬＬＩＧＥＮＴＤＥＣＩＳＩＯＮＡＬＧＯＲＩＴＨＭＦＯＲＦＡＵＬＴＤＥＴＥＣＴＩＯＮＡＮＤＩＴＳＡＰＰＬＩＣＡＴＩＯＮＷｕＪｉａｎｊｕｎ;ＺｈａｎｇＹｕｌｉｎ;ＣｈｅｎＱｉｚｈｉ（ＤｅｐａｒｔｍｅｎｔｏｆＡｅｒｏｓｐａｃｅＴｅｃｈｎｏｌｏｇｙ,...     

THE RESEARCH AND IMPLEMENTATION OF COMBINING LOGIC WITH OBJECT­ORIENTED PARADIGM

ＴＨＥＲＥＳＥＡＲＣＨＡＮＤＩＭＰＬＥＭＥＮＴＡＴＩＯＮＯＦＣＯＭＢＩＮＩＮＧＬＯＧＩＣＷＩＴＨＯＢＪＥＣＴＯＲＩＥＮＴＥＤＰＡＲＡＤＩＧＭＺｈｏｕＬｉ;ＷｕＱｕａｎｙｕａｎ（ＤｅｐａｒｔｍｅｎｔｏｆＣｏｍｐｕｔｅｒＳｃｉｅｎｃｅ,ＮＵＤＴ,Ｃｈａｎ...     

A BENDING DAMAGE THEORY FOR BEAMS UNDER PURE BENDING LOADS

ＡＢＥＮＤＩＮＧＤＡＭＡＧＥＴＨＥＯＲＹＦＯＲＢＥＡＭＳＵＮＤＥＲＰＵＲＥＢＥＮＤＩＮＧＬＯＡＤＳＹａｎｇＧｕａｎｇｓｏｎｇ;ＬｕＹｉｎｃｈｕ;ＪｉｎＸｉｎ（ＤｅｐａｒｔｍｅｎｔｏｆＡｅｒｏｓｐａｃｅＴｅｃｈｎｏｌｏｇｙ,ＮＵＤＴ,Ｃｈａｎｇｓｈａ,...     

FUZZY ALGORITHM FOR RADAR SIGNAL PROCESSING

ＦＵＺＺＹＡＬＧＯＲＩＴＨＭＦＯＲＲＡＤＡＲＳＩＧＮＡＬＰＲＯＣＥＳＳＩＮＧＺｈｕａｎｇＺｈａｏｗｅｎ;ＧｕｏＧｕｉｒｏｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＥｌｅｃｔｒｏｎｉｃＥｎｇｉｎｅｅｒｉｎｇ,ＮＵＤＴ,Ｃｈａｎｇｓｈａ,４１００７３）Ａｂｓｔｒａｃ...     

(G2-continuous) SHAPE PRESERVING CUBIC INTERPOLATION SPLINE CURVE

（Ｇ~２－ｃｏｎｔｉｎｕｏｕｓ）ＳＨＡＰＥＰＲＥＳＥＲＶＩＮＧＣＵＢＩＣＩＮＴＥＲＰＯＬＡＴＩＯＮＳＰＬＩＮＥ　ＣＵＲＶＥＦａｎｇＫｕｉ（ＤｅｐａｒｔｍｅｎｔｏｆＳｙｓｔｅｍＥｎｇｉｎｅｅｒｉｎｇａｎｄＭａｔｈｅｍａｔｉｃｓ,ＮＵＤＴ,Ｃｈａｎｇｓｈ?..     

Simulation of nonhomogeneous poisson processes by thinning

A simple and relatively efficient method for simulating one-dimensional and two-dimensional nonhomogeneous Poisson processes is presented The method is applicable for any rate function and is based on controlled deletion of points in a Poisson process whose rate function dominates the given rate function In its simplest implementation, the method obviates the need for numerical integration of the rate function, for ordering of points, and for generation of Poisson variates.     

BCH+turbo码在军用光通信系统应用中的性能分析

对应用于光通信系统的原始turbo码提出了改进方案:用BCH码做外码、turbo码做内码组成一种新的串行级联卷积码(SCCC).提出了相应的全面迭代最大后验概率(MAP)译码算法.推导了级联码的不可检测错误概率.对SCCC码的误码率进行了仿真,仿真结果表明,SCCC码在高信噪比时降低了通信系统的误码率,可适用于军用光通信系统.     

基于多单片机系统的小口径火炮激光光幕靶设计

针对高射速、高射频火炮射速和密集度检测的难题,应用光电检测和单片机技术,研究设计了一种以多单片机系统为核心,适用于高射速、高射频小口径火炮射速和密集度检测的激光光幕靶系统。提出了一种新的激光光幕设计方案,推导了弹着点计算公式,阐述了系统中的关键技术。在实验室条件下进行了弹射枪模拟实验,结果表明:激光光幕靶操作简便,工作稳定可靠,能够有效克服自然光干扰,检测速度快,精度高。     

排烟口设计对排烟效果影响的研究

排烟口是火灾发生时烟气排出的出口,排烟口高度和位置对排烟效果具有重要影响。运用FDS数值模拟方法,以实验台为依据建立数值模型,针对排烟口高度和排烟口位置的改变对排烟效果的影响进行分析,结果表明:随着排烟口高度的升高,各种排烟风速下的排烟效果都得到了改善。在排烟口风速较高的情况下,排烟口的高度变化对烟气溢出厚度的影响更大,采用大风速的控烟效果要优于小风速。侧排方式的排烟效果低于顶排方式,远壁排烟方式要优于近壁排烟方式。     

Periodic replacement when minimal repair costs vary with time

A policy of periodic replacement with minimal repair at failure is considered for a complex system. Under such a policy the system is replaced at multiples of some period T while minimal repair is performed at any intervening system failures. The cost of a minimal repair to the system is assumed to be a nonde-creasing function of its age. A simple expression is derived for the expected minimal repair cost in an interval in terms of the cost function and the failure rate of the system. Necessary and sufficient conditions for the existence of an optimal replacement interval are exhibited in the case where the system life distribution is strictly increasing failure rate (IFR).     

A stochastic model for burn‐in procedures in accelerated environment

Burn‐in procedure is a manufacturing technique that is intended to eliminate early failures of system or product. Burning‐in a component or system means to subject it to a period of use prior to being used in field. Generally, burn‐in is considered expensive and so the length of burn‐in is typically limited. Thus, burn‐in is most often accomplished in an accelerated environment in order to shorten the burn‐in process. A new failure rate model for an accelerated burn‐in procedure, which incorporates the accelerated ageing process induced by the accelerated environmental stress, is proposed. Under a more general assumption on the shape of failure rate function of products, which includes the traditional bathtub‐shaped failure rate function as a special case, upper bounds for optimal burn‐in time will be derived. A numerical example will also be given for illustration. © 2006 Wiley Periodicals, Inc. Naval Research Logistics, 2006     

Learning and costs in airframe production: A multiple-output production function approach

This article examines the influence of both production rate and learning on airframe program costs. A dynamic multiple-output production model is developed and is used to observe the cost impact of changes in production rate and learning. Several simulations are performed to demonstrate the sensitivity of the optimal time path of cost to changes in the model parameters. The model is applied by estimating parameters from the F102 airframe program.     

可变速率调制器研究及其FPGA实现

提出了一种变速率调制系统的设计方法。基于现场可编程门阵列(FPGA),在硬件系统中实现了新方法。所设计的系统能够处理(13.5~300)Mbps连续变化的比特速率。通过将整个可变速率范围分成若干小段,分别经过不同倍数的采样滤波,保证了所有符号速率对应的数据能够被调制到数模转换芯片(DAC)处理范围内。给出了系统整体设计结构,分析了硬件实现时的难点,论述了并行采样滤波与并行载波生成等设计方法。硬件实现结果表明,所提出的设计方法能够实现对较宽范围内连续可变速率信号的调制。系统的易扩展性也保证了所设计结构能够处理更宽的变速率范围。     

石英角速率传感器数字相关检测技术研究

为提高石英角速率传感器(QRS)的测量性能,提出了基于数字相关检测技术的QRS信号解调方案。该方案需将一组互相正交的参考信号作为两个相关器的输入,能够同时分离出QRS敏感信号相对于参考信号的同相分量和正交分量。通过角速度提取算法可由以上分量进一步得到输入角速度。分析了实现参考通道功能的两种方法:锁相环(PLL)和Hilbert变换,通过对这两种方法的对比得知,PLL更适合作为QRS相关检测的参考通道。     

The optimal burn-in testing of repairable equipment

The subject of this paper is the utilization of the “infant mortality” or decreasing failure rate effect to improve the reliability of repairable devices. Decreasing failure rate implies the possibility that devices which exhibit it can be improved by “burn-in testing” of each unit. Such a test serves to accumulate operating time while shielded from the full costs and consequences of failure. A general formulation of the burn-in test decision for repairable devices is presented and some special cases are solved. A class of models, indexed by the degree of partial replacement present in the repair process, is considered and numerical results for the optimal policy are given for several members of that class. A comparison of those results reveals the profitability of testing increases with the complexity of the repairable device.