直接侧向力与气动力复合控制导弹脱靶量分析

大气层内姿控式直接侧向力控制导弹末制导系统存在气动力控制与复合控制之间的切换,在这种特殊情形下引入有限时间广义H2方法进行脱靶量分析.根据复合控制导弹末制导系统数学模型,研究了切换情形下的零效脱靶量与制导系统关键参数之间的关系,分析了直接侧向力启控时间、有效导航比、修正比例导引系数以及目标估计环节时间常数对零效脱靶量的影响.分析结果为制导末端直接侧向力启控时间的确定和修正比例导引律参数的选择提供了有力依据.     

Research on terminal maneuver strategy of anti-ship missiles

To design the terminal maneuver strategy of an anti-ship missile,first,the analytical solution of miss distance when an anti-ship missile has planar weaving maneuver and three-dimension spiral maneuver...     

CSP连轧过程变形的有限元分析

借助Marc商用软件,采用弹塑性大变形热力耦合有限元法,对薄板坯CSP连轧过程的变形过程进行模拟,分析了轧制过程中各道次轧件等效应力、等效应变、等效应变速率和轧制力的变化．结果表明：在轧制变形区内,等效应变沿轧制方向逐渐增大,在轧件出口处达到最大值;而在轧件入口表面附近等效应力和等效应变速率最大;在轧制稳定阶段．轧制力在微小范围内波动;轧制力模拟值与实测值基本一致．分析结果可以为工业生产提供参考．     

Effect of rolling parameters on plate curvature during snake rolling

In order to predict the plate curvature during snake rolling,FE model was constructed based on plane strain assumption.The accuracy of the FE model was verifi ed by the comparison between the plate curvature conducted by FE model and experiment respectively.By using FE model,the effect of offset distance,speed ratio,reduction,roll radius and initial plate thickness on the plate curvature during snake rolling was investigated.The experimental results show that,a proper offsetting distance can efficiently decrease plate curvature,however an excessive offsetting distance will increase plate curvature.A larger speed ratio,reduction will cause a large plate curvature,however a larger roll radius has effect to reduce plate curvature.Plate which undergoes a larger reduction and plate with a larger initial thickness always need a larger offset distance to keep the plate the minimum plate curvature,but for a larger roll radius a smaller offset distance is needed.     

Influence of the pulsar direction error and geometry distribution on spacecraft relative navigation

X-ray pulsar navigation is one of the effective means to realize the spacecraft relative navigation. Based on the Kalman filtering measurement model of X-ray pulsar based relative navigation, the effect of pulsar direction error and geometry distribution on navigation accuracy is researched. To model the pulsar direction error, a method of translating the model error into the measurement error is proposed. Simulation results indicate that the relative distance deviation caused by pulsars direction errors of 1arcsec is up to 0.34％ and that it increases linearly with the actuating direction error when the direction error is within 1000arcsec. The effect of the pulsar geometry distribution on navigation precision is remarkable. Selecting 4 pulsars from 8 for navigation, the discrepancy of navigation precision reaches 10.74％.     

基于神经元的中远程空地导弹制导律

以经典控制的弹体闭环回路作为受控对象,研究了基于神经元的导弹自适应控制器。以整体式冲压发动机超音速空地导弹为算例,进行了末制导段弹道仿真。仿真结果表明所设计的控制规律实时性强、抑制干扰性能好,且结构简单,易于工程实现。     

Analysis of bending on the front end of sheet during hot rolling

The analysis of bending in finishing rolling was performed. An asymmetrical rolling force model was established, and the upper and lower neutral points were determined. Thc bending which resulted from the asymmetrical rolling force at the roll gap was studied and related flexibility equations were proposed according to elastic mechanics. Moreover, material mechanics was used to analyze the effects of temperature difference and self-weight on the bending out of the roll gap, and the flexibility equations were constructed. The main factors on bending were summed up, and the bending rule in the rolling could be obtained. In addition practical calculation was made with the production data of ribbon steel from Laiwu Iron ＆ Steel Group Co. Ltd.     

中厚板精轧机轧制力预报综合模型研究

为提高中厚板精轧机轧制力的预报精度,建立了Sims公式简化式与人工神经网络相结合的轧制力预报综合模型。以3 000 mm中厚板精轧机实测数据为基础,用Sims公式简化式计算轧制力主值,利用MAT-LAB人工神经网络工具箱,建立BP神经网络模型预报轧制力的偏差值,用提前结束的方法来训练网络。模型的综合采用加法和乘法两种方式。结果表明,与单独采用Sims公式简化式相比,综合模型的预报精度提高很多,而且加法网络算法的预报效果比乘法网络算法更好。     

利用导弹上调频信号测量脱靶量方法

为测量高速导弹攻击靶船的脱靶量,提出在靶船上接收处理导弹发射调频信号,处理多普勒频率和相位,获得导弹相对于靶船脱靶量的测量方法。调频信号接收,采用最大似然估值技术的接收机,在正交开环的近似最大似然估值器中完成多普勒频率、相位估值。通过仿真分析表明：脱靶量测量精度小于1m,满足使用要求。同时脱靶量测量点固定,接收信噪比高,易于信号处理,使接收机结构简单,方便应用。     

纳米添加剂对板带钢冷轧乳化液润滑性能的影响

通过四球摩擦学试验分析纳米添加剂对板带钢冷轧乳化液摩擦学性能的影响;在不同润滑条件下进行冷轧试验,分析纳米添加剂对冷轧过程和轧后带钢表面质量的影响。结果表明,含纳米添加剂的轧制乳化液与传统轧制乳化液相比,其承载能力和抗磨减摩性能均有所改善;带钢冷轧过程中采用含纳米添加剂的轧制乳化液进行润滑,可有效降低轧制压力和轧机功率、减少能耗,并且轧后带钢表面质量也有明显改观。     

CCD相机靶面倾斜误差修正应用研究

分析了光电经纬仪CCD相机靶面倾斜所带来的测量误差,解析了靶面倾斜时目标相对于光电经纬仪视轴的真实脱靶量和CCD靶面所读出的脱靶量之间的数学关系,给出了倾斜检测的方法及误差消除的数学公式,实践证明,本方法能较好地修正对CCD相机靶面倾斜对装备测量带来的影响,提高了测量精度.     

The measure of mean cook distance under the contaminated error model

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高分辨测向系统无源误差校正

近年来，出现了许多高性能的高分辨测向算法，但这些算法对系统特性较敏感，文中采用模拟退火思想讨论了当系统特性不理想情况下如何应用高分辨测向算法的问题，即系统误差校正问题．经计算机模拟仿真，结果证明，算法性能良好．     

一类周期辛矩阵对特征值问题的向后误差分析

给出一类周期特征值问题的向后误差分析，定义了特征对的范数型结构向后误差，并给出了显式表达式．     

一类周期辛矩阵对特征值问题的向后误差分析

给出一类周期特征值问题的向后误差分析,定义了特征对的范数型结构向后误差,并给出了显式表达式.     

轧钢机油膜轴承临界轧速与板厚调控分析

板带轧机广泛应用全膜润滑的滑动轴承，由于在轧制过程中轧制速度的变化较大，由此产生动压轴承的膜厚变化，这必然对板厚精度产生影响，本文采用有限元方法求解雷诺方程，对形成动压润滑的临界轧速以及影响板厚精度的轧速与油膜厚度的关系进行计算机数值模拟，以评价不同轧制工况下油膜轴承的承载特性参数，计算得出不同轧制工况下板厚变化预报公式，实现了更为精确的计算机板厚控制。     

一种基于分形修正PID算法的弹上舵机控制器

针对某型号弹上舵机采用的小型稀土力矩电机与谐波减速器的组合结构方案,设计了一种基于分形几何度量变化率特征的增量比例-积分-微分控制器.该控制器考虑了谐波传动随速度波动和低阻尼特点,以提高舵机系统控制品质为目标,从传动过程在一定的尺度范围内具有参数自相似性的特征出发,利用了线性模型与分形模型所表达的规律性之间存在的固有互补性,用反馈信号短时分形维数估计舵机实际转角与电机驱动力之间的相背离程度,并利用这个估计函数修正比例-积分-微分输出值.实验表明,该舵机系统对25°阶跃响应时常数小于100 ms,20 Hz,±15°振幅条件下的频率响应相位延时小于20°,定位精度优于0.06°,半振荡次数小于两次.     

离心机闭合误差对陀螺加速度计输入量的影响

为研究离心机闭合误差对陀螺加速度计标定精度的影响,分别从离心机自身姿态误差、主轴角速率误差、地球自转角速度等三方面进行研究,推导了存在闭合误差时,陀螺加速度计输入比力以及输入角速度的相应表达式,并结合加速度计的离心机试验以及各误差的允差计算了实际的输入比力和输入角速度误差.结果表明,控制闭合角误差的大小,选择合理的主轴旋转周数可以使得在各项误差作用下,陀螺加速度计的标定精度满足要求.     

梅钢1420冷连轧机轧制力模型的开发及应用

梅钢1420轧制力模型在Hill方程基础上,分解提炼3个关键因子,建立了显函数的轧制力模型,并进行变形抗力参数和摩擦系数参数的自适应修正以提高轧制力模型精度．经生产实践数据检验,该模型自适应系数在0．9～1．1以内,满足模型在线控制要求．     

Effect of temper rolling on the bake-hardening behavior of low carbon steel

In a typical process, low carbon steel was annealed at two different temperatures (660°C and 750°C), and then was temper rolled to improve the mechanical properties. Pre-straining and baking treatments...