基于1553B与CAN总线的电机控制网络设计

基于DSP和CPLD设计了CAN-1553B网关,选择了1553B总线作为电机控制系统的主总线,其主要用于操作系统与子控制系统之间的通信。为了更好地完成各节点之间的通信,采用CAN总线作为子系统总线,构建基于CAN总线的由一个主控制器节点和一个采集执行节点组成的电机控制网络单元,实现两个节点之间的CAN总线通信以及电机的双模位置控制,并分析了控制性能。     

基于DSP实现的智能电动执行器的设计

基于DSP微控制器和局域网控制器技术,提出了CAN总线智能电动执行器的设计.利用微型消息总线(MMB)技术,采用系统组态的方法,用SVM-DTC控制算法实现了执行器电机的变频调速控制,实现了智能电动执行机构的基本功能.其中带CAN总线接口的DSP微控制器的选用,使得智能执行器可以通过CAN总线保持实时通信,提高了执行器的智能化水平.     

航空转速传感器数据采集系统的设计研究

借助于CAN总线和DSP技术,设计了转速传感器数据采集系统,它相当于一个智能传感器。该系统由转速调理模块,显示模块,DSP与CAN总线接口模块等组成。该系统能够实现对转速信号的精确采集、测量、显示以及高效、安全通信等功能。     

基于ICD数据库的1553B总线仿真系统设计

1553B总线是广泛应用于军用航空电子系统的一种高速、双向、可靠的数据总线。通过对1553B总线接口和数据进行分析,定义了ICD数据库的结构,并设计出基于该ICD数据库的1553B总线仿真系统。该仿真系统可用于各种1553B总线设备的研制和测试,具有极大的通用性和灵活性。     

基于DSP微控制器的新型智能电动执行器设计

文章介绍了一种基于DSP微控制器的CAN总线智能电动执行器的设计,给出了控制器的系统设计、软件设计原则和程序流程图及控制方法.其中带CNA总线接口的DSP微控制器的选用,不仅可以满足复杂数据的计算,而且使得智能执行器可以通过CAN总线保持实时通信,提高了系统的实时性和可靠性;换相控制、智能校准、人机接口以及自校正和多种保护的设计,提高了执行器的智能化水平.     

基于S3C44B0X的嵌入式系统CAN总线接口的实现

CAN总线是一种应用广泛的实时性串行现场总线.通过外接独立CAN控制器可为内部未集成CAN控制芯片的处理器扩展CAN总线接口.介绍一种通过SPI接口驱动独立的CAN控制器芯片为基于S3C44B0X的嵌入式系统实现CAN总线通讯的设计方案,并详述了相关硬件电路设计的方法以及CAN通信协议的软件编程实现的设计思路.经现场测试,系统性能稳定性和可靠性均达到设计要求.     

基于FPGA的1553B总线控制器接口芯片设计

本文在分析目前国内自主研制的1553B总线接口芯片现状的基础上。介绍了一种基于FPGA的1553B总线控制器接口芯片设计。该设计基于VHDL编程,实现了传输层功能,具有自检能力,工作可靠性高。     

基于FPGA的CAN总线通信节点设计

以FPGA代替传统的单片机和外围扩展芯片,给出了CAN总线通信节点的详细设计方案.其中以SJA1000为CAN总线控制器、FPGA为主控制器,设计实现通信节点的硬件接口电路.基于对CAN总线控制器的功能分析,并应用Verilog语言进行软件设计,从而实现CAN节点之间的通信功能.     

基于STM32的CAN总线/RS232接口转换器的设计

RS232接口和CAN总线等通信技术得到广泛的应用,但是各有优缺点。RS232的接口容易受损,而在一般上位机上并没有CAN总线的接口。所以本设计主要提出了基于STM32的CAN总线/RS232接口的转换器的设计,以SN65HVD230芯片为CAN总线收发器,MAX3232实现RS232的电平转换。     

基于DSP2812和CPLD的飞机交流一次配电控制器的设计

利用DSP和CPLD,设计了飞机交流一次配电控制器,采用通用的嵌入式硬件和软件设计方法,构建了一个高性能的系统控制平台。系统采用CAN总线实现了APCU与供电系统处理机(PSP)和机电综合管理系统(EMS)的通信,通过RS485总线接口实现与地面维护设备的通信,通过ARINC429总线通信接口实现与交流一次配电控制装置的通信。     

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.     

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.     

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...