基于LabVIEW的CSRm电源输出监测系统

针对兰州重离子加速器原有的CSRm电源监测系统进行改造, 设计了基于LabVIEW的一体化电源监测系统。系统采用LabVIEW作为软件开发平台, 硬件为NI公司的PXI-6133多功能数据采集卡, 采用C/S模式进行系统搭建。前端服务器程序负责进行电源输出数据的采集和基本处理, 并将数据通过DataSocket传输协议上传;客户端程序负责数据采集卡控制参数的设定、电源数据的集中显示以及数据存储。根据现场测试可知, 该系统工作稳定可靠, 操作界面简洁方便, 易于管理, 功能完善。     

固体火箭发动机尾焰电磁波衰减试验验证技术研究

通过对固体火箭发动机地面试验现场环境及尾焰电磁波衰减近场测试技术进行研究,设计了基于矢量网络分析仪的固体火箭发动机尾焰电磁波衰减试验验证系统,介绍了尾焰电磁波衰减试验验证总体方案,现场测试方法,尾焰电磁波衰减现场测试系统硬件组成,测试系统原位校准技术,现场测试天线构建和天线位置校准方法等的研究。对构建好的测试系统进行了工程应用,并取得了良好的试验效果。     

基于LabVIEW的高温超导电缆测试平台的设计

为了进行高温超导电缆直流性能测试实验和长时间交流运行实验,开发了基于LabVIEW的高温超导电缆测试平台。该测试平台由PXI系统和标准程控仪器测试系统两部分组成。其中,PXI系统用于温度和交流信号的采集;标准程控仪器系统负责微弱直流信号的测量。平台可实现对各参量的采集、波形显示、数据保存以及历史数据查询等功能。     

基于机器视觉的汽车仪表盘指针检测

基于机器视觉构建汽车仪表自动检测系统已成为实现仪表生产测试的主要途径。基于图像空间到参数空间的收敛映射提出了改进CM-Hough变换检测算法对汽车仪表盘的指针位置实施检测。首先,介绍了基于机器视觉对汽车仪表的符号片及指针进行自动检测的系统组成。接着,针对经典Hough变换发散映射运算量大的缺点,提出了基于收敛映射CM-Hough变换进行指针检测的算法,给出了利用Hough变换的检测结果直接解算指针位置的方法。最后,将算法由软件编程实现,通过测试实验验证了算法的实时性和有效性,测试数据分析显示了指针位置误差小于1%。     

CSNS加速器真空控制系统的设计与实现

中国散裂中子源(CSNS)加速器真空控制系统负责真空数据采集、设备监控和闸板阀控制与联锁,是设备运行和故障诊断以及超高真空保持的重要保障。本文介绍了加速器真空需求,基于实验物理及工业控制系统EPICS软件框架的真空控制系统设计与实现,使用横河可编程逻辑控制器PLC控制与联锁设备,摩莎MOXA工控机监测真空状态,EPICS PV数据直接进入声音报警系统和历史数据库系统,为工作人员及时发现和处理问题、进行后续数据分析和机器研究等提供了便捷途径和可靠保障。目前,该系统已完成现场安装和调试,并已正式投入运行。运行结果表明,该系统具有稳定性好、可靠性高、人机交互友好的特点,很好地满足了加速器真空控制系统运行的需要。     

飞行器供配电系统地面通用测试接口设计

供配电地面测试负责为飞行器提供模拟供电、控制状态切换、采集并传输系统状态信息,配合完成全飞行器全周期的综合测试任务。本文首先简要介绍了供配电地面测试系统的基本功能和设备组成,然后对供电、控制、测量的接口设计进行分析,最后提出接口通用化设计方案。本文为电气系统地面通用化测试研究提供了有益尝试。     

烟雾激光透过率测试系统关键技术研究

为准确评估0.808μm、1.06μm、10.6μm激光对于推进剂包覆层烟雾的透过率,研制了激光烟雾透过率测试系统。国内首创10.6μm CO2激光器烟雾透过率测试系统,方案新颖,测试结果准确。经现场测试,该系统的精度、稳定度等指标均达到了设计要求。     

电控EGR阀综合性能测试系统的研制

电控EGR阀是废气再循环技术中重要部件,主要包括步进电机式、电磁式和直流电机式,目前针对电控EGR阀测试系统研究尚不充分。为了实现对电控EGR阀各项技术指标的测试,研制了一套电控EGR阀综合性能测试系统。系统由驱动单元、控制单元、测试单元组成。驱动单元以电控EGR阀驱动器为驱动核心,控制单元以可编程控制器为控制核心,测试单元由各项指标的测试模块组成。通过对各项技术指标测试工艺流程设计,系统实现了对电控EGR阀流量特性、内漏性能、响应时间和阀内位置感应器性能的自动测试。实验结果表明,该系统稳定可靠,各项参数的机器能力指数Cmk均超过1.67,满足技术要求。系统提供了一种针对电控EGR阀综合性能的测试方案,并成功应用于某企业电控EGR阀生产测试车间。     

静态随机访问存储器型现场可编程门阵列辐照效应测试系统研制

 在调研静态随机访问存储器型现场可编程门阵列(FPGA)器件空间辐照效应失效机理的基础上,详细论述FPGA辐照效应测试系统内部存储器测试、功能测试及功耗测试的实现原理,给出了系统的软硬件实现方法。所建立的系统可以测试FPGA器件的配置存储器翻转截面、块存储器翻转截面、功能失效截面、闭锁截面等多个参数,其长线传输距离达到50 m以上,最大可测门数达到了100万门,为FPGA辐照效应研究提供了测试平台。     

燃气轮机中热值合成气燃烧室改造技术——现场调试与考核

将某型烧天然气的燃气轮机改为烧中热值合成气,需要改造燃烧室、燃机控制系统、燃料供给系统和相关配套系统,并校核燃机关键部件的通流匹配情况.在完成合成气燃烧室设计、试验和制造之后,需要进行燃气轮机组的安装调试、现场测试和考核.本研究所建立了燃气轮机现场测试平台;进行了合成气燃气轮机的安装调试、168小时连续运行考核和第三方的燃机性能考核;初步掌握了燃机控制系统和配套系统的改造技术.现场测试平台用贴片式热电偶对火焰筒壁温进行了监测,用示温漆测量了满负荷工况火焰筒壁温分布,用燃气分析仪测量了燃烧室效率和污染物排放.考核结果表明燃机功率、燃机热耗、燃烧效率、污染物排放基本达标.     

Slave-master dynamics of semiconductor laser with short external cavity

In this paper, the dynamical response of a slave semiconductor laser, with short cavity, under injection of a chaotic light from a master semiconductor laser has been widely studied. This is analyzed numerically via bifurcation diagrams, in terms of the phase and strength of the feedback, as control parameters. It is shown that, both of these parameters should be considered in the dynamical response of the slave laser. Our numerical calculations show that the dynamics of the slave laser imitates the master laser, in addition to the feedback strength, it also heavily depends on the injection dynamics and rates. Numerical results also show that for different values of the control parameters, the intensity of the slave laser output can be fully different from the injection source. However, we found out under appropriate conditions, that the dynamics of the slave can be the same as the master laser. The results also show that the output of the slave laser, compared to its output without injection, can be stabled in the appropriate values of the injection rate from the master laser.     

A novel adaptive finite-time controller for synchronizing chaotic gyros with nonlinear inputs

In this paper, the problem of the finite-time synchronization of two uncertain chaotic gyros is discussed. The parameters of both the master and the slave gyros are assumed to be unknown in advance. The effects of model uncertainties and input nonlinearities are also taken into account. An appropriate adaptation law is proposed to tackle the gyros' unknown parameters. Based on the adaptation law and the finite-time control technique, proper control laws are introduced to ensure that the trajectories of the slave gyro converge to the trajectories of the master gyro in a given finite time. Simulation results show the applicability and the efficiency of the proposed finite-time controller.     

Robust synchronization of chaotic systems via adaptive sliding mode control

This Letter investigates the synchronization problem for a general class of chaotic systems. Using the sliding mode control technique, an adaptive control law is established to guarantee synchronization of the master and slave systems even when unknown parameters and external disturbances are present. In contrast to the previous works, the structure of slave system is simple and need not be identical to the master system. Furthermore, a novel proportional-integral (PI) switching surface is proposed to simplify the task of assigning the performance of the closed-loop error system in sliding mode. An illustrative example of Chua's circuit is given to demonstrate the effectiveness of the proposed synchronization scheme.     

Synchronization and parameter estimations of an uncertain Rikitake system

In this Letter we address the synchronization and parameter estimation of the uncertain Rikitake system, under the assumption the state is partially known. To this end we use the master/slave scheme in conjunction with the adaptive control technique. Our control approach consists of proposing a slave system which has to follow asymptotically the uncertain Rikitake system, refereed as the master system. The gains of the slave system are adjusted continually according to a convenient adaptation control law, until the measurable output errors converge to zero. The convergence analysis is carried out by using the Barbalat's Lemma. Under this context, uncertainty means that although the system structure is known, only a partial knowledge of the corresponding parameter values is available.     

Adaptive Functional Projective Lag Synchronization of a Hyperchaotic Rössler System

We explain the functional projective lag synchronization of a hyperchaotic Rössler system with four unknown parameters, where the output of the master system lags behind the output of the slave system proportionally. Based on Lyapunov stability theory, an active control method and adaptive control law are employed to make the states of two hyperchaotic Rössler systems asymptotically synchronized. Finally, some numerical examples are provided to show the effectiveness of our results.     

轰炸光电瞄准主控计算机系统软件设计

我军现役主战轰炸机均未配备光电瞄准系统,其轰瞄设备为纯光学目视老设备,夜间及复杂气象条件下无法观测目标,不能完成精确轰炸,需要配备光电瞄准系统。主控计算机系统设计为目前轰炸光电瞄准系统实现过程中待研究的关键技术。为解决轰炸光电瞄准主控计算机系统的软件设计问题,本文采用分层设计思想,设计了应用程序层、操作系统层和板级支持包(BSP)组成的主控计算机软件结构。采用自顶向下的设计思想,设计了基于ARM-VxWorks实现方案的性能稳定、较为成熟的主控计算机系统软件。结果表明用这种方案实现轰炸光电瞄准系统主控计算机,缩短了开发时间、减小了风险,可以提高开发效率,能够满足军用计算机实现方案的要求。     

Globally exponential multi switching-combination synchronization control of chaotic systems for secure communications

This article introduces the global exponential multi switching combination synchronization (GEMSCS) for three different chaotic systems with known parameters in the master-slave system configuration. The proposed GEMSCS scheme establishes the global exponential stability of the synchronization error at the origin with different combinations of state variables of the two master chaotic systems with the state variables of a slave chaotic system in diverse manners. Consequently, it increases the complexity level of the information signal in secure communications. To study the GEMSCS, an efficient nonlinear control algorithm is designed. The Lyapunov direct theorem is used to accomplish the global exponential stability of the synchronization error at the origin. The stability conditions are derived analytically. To show the effectiveness and advantages of the proposed GEMSCS control approach, two numerical examples are presented. The computer based simulation results are compared with the reported works in the relevant literature. This article also extends the idea of GEMSCS to the secure communication using the chaotic masking technique. Using the GEMSCS strategy, the information signal is recovered at the receiving system with good accuracy and high speed while the parameters of the transmitter and receiver systems mismatch. At the end, some future research problems related to this work are suggested.     

Chaos synchronization and parameter estimation of single-degree-of-freedom oscillators via adaptive control

This paper addresses the problem of synchronizing a class of single-degree-of-freedom oscillators with uncertain parameters. A modified adaptive control scheme is proposed to achieve globally asymptotic stable synchronization between the master and slave oscillators with arbitrary different initial conditions based on the Barbalat's Lemma. One of the advantages of the method is that it requires only a scalar driving signal which may be easily designed in practical applications. On the other hand, the method can ensure that the unknown parameters in the slave oscillator would be completely estimated with an adaptive updating law. Numerical simulations are performed on two examples to verify the analytical results.     

基于单向注入垂直腔面发射激光器系统的密钥分发

随机源对于信息理论安全的密钥分发至关重要,本文提出了一种基于单向注入垂直腔面发射激光器系统的密钥分发方案.首先基于单向注入的方式产生无时延特征的激光混沌信号,并通过单向注入驱动两个从激光器产生带宽增强的混沌同步信号.然后经过采样、量化以及异或等后处理,生成密钥流.数值仿真结果表明,在单阈值情况下,合法用户之间的误比特率低至1%左右,合法用户与窃听者之间的误比特率都高于10%;在双阈值情况下,误比特率可以低至10^-6.最后,对生成的密钥流进行了NIST随机性测试.该方案有效地增强了密钥分发的安全性.     

参数不确定时延超混沌系统的脉冲同步方法研究

针对一类参数不确定的异构时延超混沌系统,采用响应系统与驱动系统状态变量误差的线性反馈作为脉冲控制信号,基于Lyapunov稳定性理论实现了超混沌系统的脉冲同步,给出了渐近稳定条件,并构造了一个具有时延的数字保密通信系统.该方案保密性高,鲁棒性强.数值仿真表明系统能快速达到同步,应用混沌密码序列对数字信号进行加密后,信息信号可以在接收端有效地恢复出来. 关键词： 时延 脉冲同步 数字保密通信