基于FPGA实现的MU校验仪采样实时接口设计

由于合并单元检验仪的主控DSP的计算任务繁多,计算耗时相对较长,用于数据通信的时间减少,从而影响合并单元校验仪的采样实时性。提出一种基于ADI公司Blackfin DSP BF609的Link Port协议的FPGA接口设计方法,同步时钟最大达到83 MHz,最大数据吞吐率为650 Mb/s,极大地提高了数据通信效率,也提高了合并单元测试仪的采样实时性。     

基于FPGA的同步电动机励磁装置设计

现有同步电动机励磁装置主要是以单片机、PLC等微控制器作为励磁装置的主控单元的,在实际运行中存在稳定性不够强、速度受到制约等缺点.文中介绍了一种新的设计方案,采用集成度高,并行工作,处理信号稳定的FPGA芯片作为励磁装置的核心控制器.在硬件构架上,介绍了主控单元的电路结构及其作用;在软件设计上,实现了励磁装置的整个功能.实验结果验证了该设计的合理性和可行性.     

基于反熔丝FPGA的多路数据采集单元

针对多路高速数据采集单元硬件部分,设计了基于反熔丝FPGA的多路数据采集方案.分析了浪涌电流的危害以及抑制浪涌电流的方法,阐述了反熔丝FPGA的优越特点,并对系统的各组成模块进行了详细的说明.设计采用反熔丝FPGA器件A32100DX作为系统的主控器件,实现了A/D转换、模拟开关选通控制以及数字信号的并串转换等功能.     

大视场长焦面光学遥感器双凸轮式焦面调焦机构

为保证焦面长度大于600mm的大视场空间光学遥感器在空间环境下的成像质量,设计了一套在±2 mm调焦范围内焦面组件倾斜小于7”、定位精度优于0.01 mm的焦面调焦机构.针对系统对调焦精度、力学环境、真空环境的要求,该调焦机构采用双凸轮驱动技术来满足调焦精度要求;采用失电制动器自锁技术,使相机经发射等力学环境冲击后像面位置仍保持稳定.此外,采用高刚度导轨和轴承使调焦机构具有较高的动态刚度.设计分析及实验证明,该套焦面调焦机构具有较高的调焦精度和可靠性,能够在复杂的空间环境下完成调焦任务,提高遥感器的成像质量.     

可实时监控的皮革真空干燥机控制系统的设计开发

概述了皮革真空干燥机的结构组成和工作流程,以PLC为主控单元,以触摸屏为控制界面,进行了可实现实时监控的真空干燥机控制系统的总体结构设计和软件模块的开发,进行了联机调试,已成功地与主机配套使用,提高了系统控制作业的可靠性和操作的方便性.     

飞机电源高精度在线监测系统研究

基于高精度采样电路和高速采样技术,实现对飞机电源系统的深入分析.通过采用TI的高精度运放和高频采样芯片以及必要的外围电路,并运用仿真软件对设计电路进行设计仿真来提高电路的抗干扰和抗噪能力.该系统由Xilinx公司生产的现场可编程逻辑门阵列(Field-Programmable Gate Array,FPGA)采样主控模...     

宽幅相机一体化焦面调整机构设计与精度分析

针对空间宽幅相机对调焦和调偏流的要求,设计了一种一体化焦面二维调整机构,能够同时实现调焦和调偏流功能,并基于蒙特卡罗法对机构进行了精度分析。机构总重12kg,调焦范围为(-4^+4)mm,调焦单元定位精度优于0.0045mm,调焦分辨力优于2.1μm;调偏流单元调偏流范围为(-5^+5)°,定位精度为1.48",调偏流分辨力优于0.18",各项指标均满足设计要求。一体化焦面二维调整机构结构紧凑,占用空间小,结构强度好,承载能力强,适用于大尺寸焦面空间相机。     

基于SAEJ1939协议的柴油发动机参数显示系统

针对具有SAEJ1939 CAN总线接口的发动机ECU,开发了基于CAN总线的发动机状态参数及故障信息显示系统.该系统硬件部分采用内部集成CAN控制器的STM32作为主控MCU,同时结合CAN收发器CTM1050T实现CAN总线数据的收发.软件部分通过μCOSII建立SAE J1939解析任务、触摸屏任务和μCGUI界面任务,通过任务间的调度实现发动机的运行状态和相关单元的重要参数及车辆故障信息的多界面显示.实际运行表明,该系统能够准确实时显示发动机参数,并且具有扩展能力强、成本低、交互界面友好等优点.     

基于FPGA的高速实时数据采集存储系统设计

介绍一种基于FPGA的数据采集存储器的设计,以sparten2系列的XC2S200芯片为主控单元,结合相关外围电路和FLASH存储器K9F2G08UOM共同组成存储系统.采用双存储设计,增强了系统可靠性,实现对一路高速10MbpsPCM数据码流和一路3.75M异步串行图像数据的采集和存储.同时与测试台和计算机配合完成对采集数据的实时监测.     

活塞双模浇铸机电气控制系统的设计

本文主要介绍活塞双模浇铸机的电气控制系统的设计,采用omron可编程序控制器为主控单元,omron触摸屏为操作界面,根据设备的工作环境和工艺要求,进行软件、硬件的设计,采用合理的设计提高电气控制系统的安全稳定性。     

三绕组变压器的双绕组等效建模及在Matpower中的应用

针对实际电网存在着大量的三绕组变压器,但国际上一些著名商业软件,如BPA仿真软件、Matpower这一权威潮流计算开源软件,均只提供双绕组变压器模型,限制了其在具有三绕组变压器的电力系统中的应用的问题,潮流计算是自主开发的电力系统各种应用软件的核心模块,因此依托国际权威开源程序进行二次开发,是一种较好的选择。对Matpower要求的数据格式进行了归纳,对变压器的一般的等值电路及带理想变压器的等值电路和带标幺值的等值电路进行了分析研究,提出了三绕组变压器转换为双绕组等效模型的建模方法,使得原先只适应双绕组变压器的潮流计算软件可以适用于三绕组变压器电网的潮流计算;最后以Matpower软件为例进行了案例计算,并用PSASP仿真软件进行对比验证。研究结果证明,所提出的建模方法是有效的。     

On the Relation of Load to Average Gap in the Contact Between Surfaces with Longitudinal Roughness

A computer simulation model for the contact between longitudinally-oriented rough surfaces has been formulated. This model closely duplicates the actual surf ace contact deformation behavior by taking into account the elastic interactions between the asperities. There were no assumptions made about the shapes, or any deformation behavior of the asperities, except for their obeying the laws of elasticity. The plastic deformations on the high asperity peaks were taken into account by setting a ceiling on their contact pressures at the material hardness value. The simulations used real surface profiles which were digitized from unworn circumferentially ground steel surfaces. Each pair of these profiles was mathematically combined to form an equivalent rough profile pressing against an infinitely rigid flat and having the appropriately adjusted elastic modulus. A total of 28 different pairs of profiles were used in the simulations. Each contacting pair was subjected to 30 different load levels and the local contact pressures and deformations were calculated. The contact simulations yielded some important mathematical relationships between parameters, such as the real area of contact, average gap, and average asperity load through statistical curve fitting. Two analytical functions were generated to relate the average load to average gap and the real area of contact to load.     

电站锅炉模糊风险评价方法研究与应用

针对电站锅炉风险等级评价问题,将模糊综合评价技术应用到电站锅炉风险等级评价中。开展了电站锅炉失效影响因素及模糊评价因素的重要程度分析,建立了一套科学合理适于在线评价的电站锅炉风险评价体系,提出了模糊综合评价技术与改进的模糊层次分析法相结合的模糊风险评价方法,利用改进的模糊层次分析法计算了指标体系中各层指标权重。对某一台电站锅炉的实际运行工况影响子因素进行了模糊风险评价,采用模糊合成算子进行模糊综合运算得到电了站锅炉运行工况影响子因素的评价向量。研究结果表明:电站锅炉的运行工况影响子因素的风险评价等级为第6级,失效可能性等级为小,该电站锅炉运行工况良好。     

交通荷载作用下桥梁结构参数识别方法

应用动力节点加载法,将作用在桥梁上的交通荷载转化为等效节点荷载,再用两步构造法识别结构物理参数.第1步,用Newmark-β方法变换结构运动方程,并用结构的加速度响应求得变换空间内的位移、速度和加速度响应;第2步,基于最小二乘原理,构造出变换空间内求解结构参数的递推式,进行结构物理参数识别.数值模拟结果表明,在交通荷载作用下,该方法能够快速、准确地进行桥梁结构参数识别.     

RLS and LMS blind adaptive multi-user detection method and comparison in acoustic communication

RLS and LMS blind adaptive multi-user detection algorithm and multi-user detector was proposed to solve the problem of multi-user signal detection problem encountered in underwater acoustic communication networks.In simulation analysis,RLS and the LMS blind adaptive multi-user detector were designed and tested for synchronous and asynchronous multi-user communication process.The results of SIR comparison and MMSE comparison show that,both of the two methods can realize blind adaptive detection when any user change in multi-user communication,during this process,the training communication sequences are not needed.The RLS algorithm has about 5 dB higher in SIR compared with LMS algorithm,and the convergence velocity of RLS algorithm is also higher than LMS algorithm when the communication users change.RLS algorithm has better ability in multi-user detection than that of LMS algorithm,and it has great attraction and guiding significance for solving the problem of multiple access interference(MAI) in multi-user communication.     

Robust Impedance Control of Robots Using an Adaptive Interaction Force Observer

For robot interaction control,the interaction force between the robot and the manipulated object or environment should be monitored.Impedance control is a type ...     

Research on key techniques of expendable conductivity temperature depth measuring system

This paper analysis the developing of expendable conductivity temperature depth measuring system(XCTD)and introduce its principle of measuring about temperature,salinity and depth of ocean.Some key techniques are put forward.According to the real needs of XCTD,conductivity sensor with high sensitivity is designed by principle of electromagnetic induce,the ocean conductivity from induced electromotive force has been calculated.Adding temperature correction circuit would help to reduce error of conductivity measurement because of sharply changing temperature.Advanced temperature measuring circuit of high precision and the constant current source is used to weaken effect of self-heating of resistance and fluctuation of the source.On respect of remote data transmission,LVDS is a good choice for the purpose of guarantee the quality of data transmitted and the transmission distance is reaching to thousand meters in the seawater.Modular programming method is also brought into this research aimed at improve the stability,reliability and maintainability of the whole measuring system.In February,2015,the trials in South China Sea demonstrate that the developed XCTD realize effective measurement at a speed of 6 knots and detection depth at 800 m.The consistency coefficient of the acquired data is greater than 0.99 and the success rate of probe launching is above 90%.     

CHARACTERISTCS OF FLUID FILM IN OPTIMIZED SPIRAL GROOVE MECHANICAL SEAL

In order to investigate the sealing performance variation resulted from the thermal deformation of the end faces, the equations to calculate the fluid film pressure distribution, the bearing force and the leakage rate are derived, for the fluid film both in parallel gap and in wedgy gap. The geometrical parameters of the sealing members are optimized by means of heat transfer analysis and complex method. The analysis results indicate that the shallow spiral grooves can generate hydrodynamic pressure while the rotating ring rotates and the bearing force of the fluid film in spiral groove end faces is much larger than that in the flat end faces. The deformation increases the bearing force of the fluid film in flat end faces, but it decreases the hydrodynamic pressure of the fluid film in spiral groove end faces. The gap dimensions which determine the characteristics of the fluid film is obtained by coupling analysis of the frictional heat and the thermal deformation in consideration of the equilibrium condition of the bearing force and the closing force. For different gap dimensions, the relationship between the closing force and the leakage rate is also investigated, based on which the leakage rate can be controlled by adjusting the closing force.     

Quantum Cooperative Robotics and Autonomy

The intersection of Quantum Technologies and Robotics Autonomy is explored in the present paper.The two areas are brought together in establishing an interdisci...     

OPTIMIZATION METHOD ON IMPELLER MERIDIONAL CONTOUR AND 3D BLADE

An optimization method for 3D blade and meridional contour of centrifugal or mixed-flow impeller based on the 3D viscous computational fluid dynamics (CFD) analysis is proposed. The blade is indirectly parameterized using the angular momentum and calculated by inverse design method. The design variables are separated into two categories: the meridional contour design variables and the blade design variables. Firstly, only the blade is optimized using genetic algorithm with the meridional contour remained constant. The artificial neural network (ANN) techniques with the training sample data schemed according to design of experiment theory are adopted to construct the response relation between the blade design variables and the impeller performance. Then, based on the ANN approximated relation between the meridional contour design variables and impeller performance, the meridional contour is optimized. Fewer design variables and less calculation effort is required in this method that may be widely used in the optimization of three-dimension impellers. An optimized impeller in a mixed-flow pump, where the head and the efficiency are enhanced by 12.9% and 4.5% respectively, confirms the validity of this newly proposed method.