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舵机是导弹控制系统的重要执行机构,为实现对电动及气动多种型号导弹舵机性能的测试,设计开发了一种基于LabWindows/CVI虚拟仪器的测控系统。介绍了该测控系统硬件组成和软件结构流程,软件设计过程中充分利用多线程、数据库等技术,准确快速完成舵机自动化性能测试。应用结果表明:该舵机测控系统工作稳定,测试精度和自动化程度高,满足舵机试验测试精度和技术指标要求,为舵机的性能研究和维修维护提供了良好的测试环境。 相似文献
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为了提高雷达天线系统外场的测试水平,研制了一种便携式雷达天线系统测试与控制平台;文章介绍了平台的组成结构,并详细地介绍了平台的软件设计;平台的软件设计采用LabWindows/CVI和VC++混合编程的思想,利用LabWindows/CVI开发了上层应用程序, 实现了良好的人机交互界面,采用VC++6.0开发了底层驱动程序,底层驱动程序以动态链接库形式封装,保证了硬件测控的实时性;实际应用表明该软件能满足雷达天线系统测试的需求,并能保证整个测试平台的实时性和可靠性,简化了测试过程。 相似文献
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介绍了一种基于Simulink和C++混合编程技术的自动飞行控制系统测试系统建模技术及调试方法;基于Simulink搭建飞行仿真模型,通过RTW自动代码生成工具将各仿真模块分别生成嵌入式代码,并集成应用于C++软件设计环境中;通过对时钟的有效设定,实现了基于Windows系统的实时飞行仿真测试系统的设计,仿真软件的最小运算周期为2 ms;该技术不仅可以满足自动飞行控制系统飞行仿真试验的实时性要求,并且在软件开放性、接口扩展性、板卡驱动的通用性以及软件设计功能多样性等方面占有较大优势;基于这个技术建立而成的仿真测试系统,某型自动飞行控制计算机已经成功的开展了多轮半物理仿真验证试验,并取得了良好的试验效果,从而为产品的试飞定型奠定了坚实的基础。 相似文献
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惯导加速度计在精密离心机上的标校应用试验,涉及精密离心机动态半径和静态半径的精密测量、转速的精确测控以及被校加速度计信号的正确采集与实时传输等操作,需严格控制各类测控仪器的动作时序逻辑实现精密离心机精密测控与加速度计标校应用试验的自动化操作。介绍一种精密离心机测控与加速度计标校应用试验自动化系统设计,硬件上基于LAN总线组网集成精密离心机各类测控仪器,构建分布式测控系统,并应用外部光栅编码器脉冲信号作为触发信号控制测控仪器的硬件时序同步逻辑;软件上应用共享变量技术实现各类测控参数的有序传输,针对动态波形类大数据测试信号的共享变量传输可靠性差问题,提出一种基于文件动态拷贝的网络数据传输方案,设计严格的共享变量传输逻辑机制,实现了各类测控参数正确有序采集与传输。应用试验表明,设计的精密测控与加速度标校应用试验自动化系统满足加速度计在精密离心机上的标校自动化需求,显著提高了加速度计标校应用试验效率。 相似文献
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文章以LabVIEW 图形化编程语言、模糊控制工具箱及PID工具包等为开发平台,设计温度测控系统;利用Matlab Simulink 进行仿真实验,并与常规PID的控制效果比较;利用模糊逻辑(fuzzy logic)模块及LabVIEW提供的仿真模块(simulation module)建立系统仿真框图;通过仿真曲线分析模糊PID控制效果及影响因素,动态调整Kp,Ki,Kd的设置,缩短了控制器的设计周期,明显改善系统的稳态性能以及稳态响应,具有较大的工程实用价值。 相似文献
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介绍了一种双向数据传输系统设计方案和实现方法,采用USB2.0接口芯片CY7C68013A与FPGA相结合构建硬件系统,FPGA内嵌NIOS II软核处理器负责数据处理;系统通过USB接口向上传输数据到上位机,结合基于VC++开发的数据传输控制软件平台,发送控制命令及数据到硬件系统端,从而实现USB接口的双向数据传输功能;详细描述了系统的硬件电路设计和软件实现过程,实验证明该系统具有高速、便携、通用性强的特点,系统数据最高传输速度达到33 MB/s,且工作稳定可靠。 相似文献
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针对ABS控制器开发过程中纯数值仿真过于理想化,实车试验成本高、周期长等缺点,设计并搭建了客车ABS硬件在环仿真测试系统;系统由xPC目标实时仿真环境、气制动系统及整车动力学模型组成;气制动系统按照真实客车制动系统并配合力传感器搭建;整车动力学模型由轮胎模型、七自由度车辆模型、制动器模型等组成,并利用Simulink建模;在ABS控制策略中引入逻辑门限值控制,在客车ABS硬件在环仿真测试系统上测试了客车在高附着系数、低附着系数及对接路面上的制动情况;试验表明:逻辑门限值控制能很好地将车轮滑移率控制在最佳滑移率附近,具有较好的控制精度及鲁棒性。 相似文献
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Guided-Wave Two-Dimensional Acousto-Optic Scanner Using Proton-Exchanged Lithium Niobate Waveguide 总被引:1,自引:0,他引:1
Two-dimensional scanning of a 0.6328 mum guided-light beam has been realized using noncolinear acousto-optic (AO) coplanar Bragg diffraction together with colinear AO guided-mode to substrate radiation-mode conversion in a Z-cut Xpropagation LiNbO3 proton-exchanged (PE) waveguide. The two surface acoustic (SAW) waves utilized are at the center frequencies of 500 and 200 MHz, propagating in the Y and X axes, respectively. Two-dimensional scanning of approximately 720 resolvable light beam spots, namely, 18 40 (horizontal vertical) scanning, has been demonstrated using a light beam of 1.0 mm aperture. The total number of resolvable beam spots can be greatly increased from 720 by simply utilizing SAW transducers of larger bandwidth and a light beam of greater aperture. It should also be possible to significantly increase the diffraction efficiency from 3 % by optimizing the parameters of the PE waveguide and the SAWs. 相似文献
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A review of schemes for multiple access in fiber optic networks shows that a hybrid of wavelength and code division multiple access (WCDMA) combines the best features of both. In particular, the hybrid scheme retains the large information carrying capacity of wavelength division multiple access (WDMA) and flexibility of code division multiple access (CDMA). In this paper WDMA, optical CDMA (OCDMA), and WCDMA networks are discussed. In OCDMA networks, concept of incoherent and coherent coding including inverse decoding and matched filter is introduced. The delay performance of both WDMA and WCDMA networks, under the simple suboptimum access protocols based on cyclic search, is computed. It has been shown quantitatively that tuning delay significantly affects the delay performance of both WDMA and WCDMA networks. Futhermore, delay performance of WCDMA networks is always better than the WDMA networks for the same tuning delay, load, and number of users. 相似文献
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S. G. Nedel’ko M. A. Krysyuk A. L. Apanasenko L. N. Lymarenko Z. T. Moroz 《Journal of Applied Spectroscopy》1997,64(1):55-61
Results of a study of the effect of γ-radiation on the spectral luminescence properties of cadmium tungstate crystals doped
with silver, bismuth, and molybdenum cations are presented. Spectral characteristics of the nondnnnoped crystals are briefly
described. Absorption and photo and X-ray luminescence spectra of the crystals taken before and after exposure to γ-radiation
(5.5·104 Gy) are compared. It is found that the spectral characteristics of the crystals doped with silver, bismuth, and molybdenum
cations do not change markedly after the exposure. The relation between the type of impurity-induced defects, individual characteristics
of the impurity cations, and the character of the effect of γ-radiation on the spectral luminescence properties of impure
crystals is analyzed (preliminarily).
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 64, No. 1, pp. 55–60, January–February, 1997. 相似文献
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References: 《声学学报:英文版》2008,27(1):23-33
The performance of port/starboard discrimination of dual-line array will be seriously degraded when the space between the two line arrays of the dual-line array is mismatched. The directivity function of the delay-sum and delay-subtract beamforming is deduced and the port/starboard discrimination of the delay-sum and delay-subtract beamforming is also studied both under the ideal status and the status under which the space between the two line arrays of the dual-line array is mismatched. Analysis results show the delay-subtract beamforming has better performance of port/starboard discrimination. At last, the sea trial results demonstrate the theoretical results. 相似文献
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A multi-conjugate adaptive optics (MCAO) can offer a possibility of widening field of view (FOV) characterized by the isoplanatic angle, and the choose of conjugate height becomes a basic problem for MCAO, which influences the size of iosplanatic angle. Considering the application of lidar, the isoplanatic angle's expressions of two deformable mirrors (DMs) MCAO for uplink and downlink are deduced. The effects of conjugate heights for dual-conjugate AO are thoughtfully discussed, and the isoplanatic angles are further analyzed. The results show that the isopanatic angle varies with the conjugate height and reaches the maximum as the conjugate height is at the optimal altitude. Moreover, the optimal conjugate height changes with the propagation distance. 相似文献
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Due to the limit of response speed of the present single-photon detector, the code rate is still too low to come into practical use for the present quantum key distribution (QKD) system.A new idea is put up to design a quick single-photon detector.This quick single-photon detector is composed of a multi-port optic-fiber splitter and many avalanche photo diodes (APDs).Au of the ports with APDs work on the time division and cooperate with a logic discriminating and deciding unit driven by the clock signal.The operation frequency lies on the number N of ports, and can reach N times of the conventional single-photon detector.The single-photon prompt detection can come true for high repetition-rate pulses.The applying of this detector will largely raise the code rate of the QKD, and boost the commercial use. 相似文献
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With a novel light-weight and absolutely calibrated ultraviolet (UV) spectrometer, UV skylight radiances and O3 slant column densities are measured by balloon-borne limb measurements in Xinjiang area, China. UV skylight radiances measured at the height of 31 km are compared with the results from Modtran in the wavelength range from 290 to 420 nm. O3 slant column densities are derived from radiance spectra in the Huggins bands (320 - 335 nm) using differential optical absorption spectroscopy method. And the parameter exhibits a good correlation with the same value simulated by radiative transfer model (Tracy). The O3 profile simultaneously measured by an O3 sonde is used as input in Tracy calculations. The O3 sonde is launched on the same balloon. 相似文献
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For breaking through the sensitivity limitation of conventional surface plasmon resonance (SPR) biosensors, novel highly sensitive SPR biosensors with Au nanoparticles and nanogratings enhancement have been proposed recently.But in practice, these structures have obvious disadvantages.In this study, a nanohole based sensitivity enhancement SPR biosensor is proposed and the influence of different structural parameters on the performance is investigated by using rigorous coupled wave analysis (RCWA).Electromagnetic field distributions around the nanohole are also given out to directly explain the performance difference for various structural parameters.The results indicate that significant sensitivity increase is associated with localized surface plasmons (LSPs) excitation mediated by nanoholes.Except to outcome the weakness of other LSP based biosensors, larger resonance angle shift, reflectance amplitude, and sharper SPR curves' width are obtained simultaneously under optimized structural parameters. 相似文献
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Novel polymer distributed feedback(DFB)gratings are fabricated based on photopolymerization to reduce lasing threshold of polymer lasers.A photopolymer formulation sensitive to 355-nm ultraviolet(UV)light is proposed for the fabrication of polymer gratings and it can be used to form polymer films by spin-coating process.A very low surface-relief depth ranging from 12.5 to about 1.0 nm has been demonstrated with a refractive-index modulation of about 0.012.The experimental results indicate that such polymer gratings have promising potentials for the fabrication of low-order DFB organic semiconductor lasers. 相似文献