基于DSP的数字式中心线校正装置设计

自行火炮中型底盘传动装置中心线校正是装配与维修工作中一项重要的工作,基于DSP技术研制自行火炮数字式中心线校正装置,可以直接显示被测部件加减调整垫的厚度,提高了校正精度,适用范围广。     

基于计算机控制的自行火炮测瞄装置MTF测量

测瞄装置是自行火炮的重要组成部分。本文介绍了一种采用光电探测原理和计算机控制的信息处理技术,对自行火炮测瞄装置调制传递函数（MTF）进行测量的方法;本文提出的计算机对自行火炮测瞄装置MTF的测量,突破了机械扫描法模拟傅里叶变换原理,采用蓝牙技术和计算机控制的光电探测原理完成对测瞄装置MTF的测量。用该方法全面评价测瞄装置质量,具有操作简单、速度快、精度高、测量周期短的特点,适用于较小在空间的自行火炮对测瞄装置进行MTF测量。     

基于计算机控制的自行火炮测瞄装置MTF测量

测瞄装置是自行火炮的重要组成部分。本文介绍了一种采用光电探测原理和计算机控制的信息处理技术，对自行火炮测瞄装置调制传递函数(MTF)进行测量的方法：本文提出的计算机对自行火炮测瞄装置MTF的测量，突破了机械扫描法模拟傅里叶变换原理，采用蓝牙技术和计算机控制的光电探测原理完成对测瞄装置MTF的测量。用该方法全面评价测瞄装置质量，具有操作简单、速度快、精度高、测量周期短的特点，适用于较小空间的自行火炮对测瞄装置进行MTF测量.     

时间序列分析法用于常减压炼油装置测量数据校正

提高常减压炼油装置过程数据校正精度的有效手段是增加测量数据的冗余。通过对影响测量数据校正的因素进行分析，建立了时序平均值模型，提出了使用时间序列分析法来增加数据校正过程时间冗余的新方法，可在不增加测量点的前提下改善校正数据精度。采用常减压炼油生产装置的实际测量数据，对时间序列分析法的过失误差侦破能力、数据校正精度受时域值、过失误差大小的影响等进行了研究，探讨了时序法的可行性和实用性。结果表明，时序法可以快速有效地用于该装置的实时测量数据校正。     

W2P1微型涡喷发动机地面试车台推力测量系统

介绍了W2P1微型涡喷发动机地面试车台推力测量系统,包括W2P1发动机试车台架,推力测量系统(推力测力系统、推力校正系统)、液压加载校准装置及其校正方法.试车证明,该发动机试车台推力测量系统结构简单,性能稳定,操作简单方便,精度可达0.1%.     

W^2PI微型涡喷发动机地面试车台推力测量系统

介绍了Ｗ＾２ＰＩ微型涡喷发动机地面试车台推力测量系统,包括Ｗ＾２ＰＩ发动机试车呆,推力测量系统（推力测力系统、推力校正系统）、液压加载 准装置及其校正方法。试车证明,该发动机试车台推力测量系统结构简单,性能稳定、操作简单方便,精度可达０．１％。     

基于PC机控制的自行火炮发动机转速测量装置的研制

针对自行火炮发动机的特点,本文阐述了利用PC机控制技术,对自行火炮发动机转速的测量原理及实验方法,并对测量精度作了具体分析,在实际运用中是可行的。     

火控显示控制系统检测维修设备的设计

针对自行火炮火控显示控制系统结构复杂、技术含量高和检测维修难度大的特点,根据火控显示控制系统检测维修现状,采用虚拟仪器技术和故障专家诊断系统设计的高性能火控显示控制系统检测维修设备,具有很强的兼容性和扩展性。该设备简化了检测维修过程,成功解决了由于显示控制系统本身出现故障而影响维修人员快速维修的问题,及时恢复其战技性能,缩短了故障定位的时间,极大地提高了自行火炮维修保障能力。     

一种基于椭球约束和Procrustes分析的磁矢量传感器校正算法

磁矢量传感器在测量过程中将受到载体及其他工作部件的干扰,为保证和提高测量精度,提出了基于椭球约束和Procrustes分析的磁矢量传感器校正算法。在分析误差来源并进行分类的基础上,建立了磁矢量传感器误差模型,通过椭球约束法和正交Procrustes分析获得了由测量值到真值的映射关系,实现磁矢量传感器的校正。仿真结果表明,该校正方法能有效地完成磁矢量传感器的校正,而且方法简单、易于实现,在较大噪声水平下也能较好的完成校正工作。     

积分法动态数据校正技术的研究

基于积分法的动态数据校正具有简单、快速和适于在线应用的优点。本文对积分法动态数据校正技术的原理及其应用方法进行了研究。研究结果表明,该方法不要求有状态空间模型,能够充分利用整个时间轴的时间冗余信息;但积分法中的区间长度对其校正精度有影响,因此,采用该方法进行校正时应首先确定适宜的区间长度。将积分法应用于常减压炼油装置拟稳态过程的数据校正,计算结果表明该方法的计算精度高于稳态数据校正。     

A modified explicit numerical scheme for the two-dimensional sine-Gordon equation

Abstract

A fourth-order rational approximant to the matrix-exponential term in a three-time-level recurrence relation is used to transform the two-dimensional sine-Gordon equation into a second-order initial-value problem. The resulting nonlinear system is solved using an appropriate predictor–corrector (P-C) scheme in which the predictor is an explicit one of second order. The procedure of the corrector is accelerated by using a modification (MPC) in which the already evaluated values are used for the corrector. Both the nonlinear method and the predictor–corrector are analysed for local truncation error and stability. The MPC scheme has been tested on line and circular ring solitons known from the literature, and numerical experiments have proved that there is an improvement in accuracy over the standard predictor–corrector implementation.     

A digital crystal-less clock generator using a phase error corrector

Microsystem Technologies - A multi-phase digital crystal-less clock generator (CLCG) with a phase error corrector is presented for on-chip and multi-phase systems. For the temperature variations,...     

Asynchronous circuits for low power: a DCC error corrector

The authors describe a complete low-power digital compact cassette error corrector. Using Tangram, a high-level programming language, they designed two asynchronous circuits that correct errors on DCC specifications     

Three-dimensional digital line segments

Digital arcs in 3-D digital pictures are defined. The digital image of an arc is also defined. A digital arc is defined to be a digital line segment if it is the digital image of a line segment. It is shown that a digital line segment may be characterized by the chord property holding for its projections onto the coordinate planes. It is also shown that a digital line segment may not be characterized by its own chord property. A linear time algorithm is presented that determines whether or not a digital arc is a digital line segment.     

直线电机城市轨道试验线无线控制系统研究

为了能在控制室中观测直线电机城市轨道试验线车辆运行过程中电量参数变化并实时有效地控制车辆,研究了车辆传感器信号的无线采集与控制系统。系统基于LabVIEW软件构建上位机程序,通过串口通讯方式控制无线模块与下位机之间的指令与数据交互,下位机采用数字信号处理器TMS320F2812编程实现直线电机车辆的变频调速控制,同时采集车辆运行过程中直线电机的电压、电流等传感器信号,将采集到的数据在DSP中经过处理并通过无线传输方式发送到上位机实现人机交互。实验证明在中央控制室中能够实时测量并有效控制试验线车辆的运行状况,发送与接收的数据信号错误率为0.883‰,通过改进程序可以有效屏蔽错误指令。研究表明该无线传输方式在直线电机城市轨道实验线中不仅能够有效实现数据交互,而且达到了预期的控制目的。     

Fault-tolerant systems with concurrent error-locating capability

Fault-tolerant systems have found wide applications in military,industrial and commercial areas.Most of these systems are constructed by multiple-modular redundancy or error control coding techniques,They need some fault-tolerant specific components (such as voter,switcher,encoder,or decoder) to implement error-detecting or error-correcting functions.However, the problem of error detection location or correction for fault-tolerance specific components them-selves has not been solved properly so far.Thus ,the dependability of a whole fault-tolerant system will be greatly affected.This paper presents a theory of robust fault-masking digital circuits for characterizing fault-tolerant systems with the ability of concurrent error location and a new scheme of dual-modular redundant systems with partially robust fault-masking prperty.A Basic robust fault-masking circuit is composed of a basic functional circuit and an error-locting corrector,Such a circuit not only has the ability of concurrent error correction,but also has the ability of concurrent error location.According to this circuit model ,for a partially robust fault-making dual-modular redundant system,two redundant modules based on alternating-complementary logic consist of the basic functional circuit.An error-correction specific circuit named as alternating-complementary corrector is used as the error-locating corrector.The performance(such as hardware complexity, time delay) of the scheme is analyzed.     

Finite difference solution of differential equations with stochastic inputs

This paper discusses application of two numerical methods (central difference and predictor corrector) for the solution of differential equations with deterministic as well as stochastic inputs. The methods are applied to a second order linear differential equation representing a series RLC netowrk with step function, sinusoidal and stochastic inputs. It is shown that both methods give correct answers for the step function and sinusoidal inputs. However, the central-difference method of solution is recommended for stochastic inputs. This statement is justified by comparing the auto-correlation and cross-correlation functions of the central-difference solution (with stochastic inputs) with the corresponding theoretical values of a continuous system. It is further shown that the more common predictor-corrector methods, although suitable for solution of differential equations with regular inputs, diverge for stochastic inputs. The reason is that these methods, by the application of several point integral formulas, use a high degree of smoothing on the variable and its derivatives. Inherent in the derivation of these integral formulas is the assumption of the continuity of the variable and its derivatives, a condition which is not satisfied in problems with stochastic inputs.Note that the second order differential equation chosen here for numerical experiments can be solved by classical methods for all of the given inputs, including the probabilistic inputs. The classical methods, however, unlike the numerical solutions, can not be extended to nonlinear differential equations which frequently arise in the digital simulation of engineering problems.     

A third order numerical scheme for the two-dimensional sine-Gordon equation

A rational approximant of third order, which is applied to a three-time level recurrence relation, is used to transform the two-dimensional sine-Gordon (SG) equation into a second-order initial-value problem. The resulting nonlinear finite-difference scheme, which is analyzed for stability, is solved by an appropriate predictor–corrector (P–C) scheme, in which the predictor is an explicit one of second order. This scheme is accelerated by using a modification (MPC) in which the already evaluated values are used for the corrector. The behavior of the proposed P–C/MPC schemes is tested numerically on the line and ring solitons known from the bibliography, regarding SG equation and conclusions for both the mentioned schemes regarding the undamped and the damped problem are derived.     

用MATLAB进行滞后-超前校正器的设计

介绍了用MATLAB进行滞后－超前校正器的设计方法，给出了基于频率法设计滞后－超前校正器的函数frlaglead.调用该函数就可以设计所需的 滞后－超前校正器，最后以实例介绍了用MATLAB设计滞后－超前校正器的详细过程。