基于labview的热变形误差计算及补偿方法

温度是机械加工中最基本的参数之一,在生产过程中常需要对温度进行检测和监控。数控机床加工中,常需要对数控机床进行热误差计算并实现热误差补偿,通过热误差补偿技术来达到提高数控机床加工精度的目的。因此,研究一种基于串行通信的多路温度采集和实时监控系统,对提高工业控制性能、提高数控机床的加工精度以及提高生产效率有着重要的意义。     

基于DSP与FPGA的四轴运动控制器设计与研究

针对数控系统的工作特点和要求,通过对DSPTMS320F2812、FPGAEP2C8F256C6及以太网控制器RTL8019AS的深入研究,设计了一种基于DSP与FPGA的运动控制器。该控制器以DSP和FPGA为核心器件,针对运动控制中的实时控制、高精度等具体问题,规划了DSP的功能扩展,并在FPGA上扩展了功能相互独立的四轴运动控制电路。该电路实现了四路控制信号输出,四路编码信号的接收和处理,以及原点信号,正负限位信号等数字量的接收和处理。具有结构简单、开放性、模块化等特点,能够较好的满足运动控制器的实时性和精确性。     

Virtual engineering: an integrated approach to agile manufacturing machinery design and control

A virtual manufacturing approach for designing, programming, testing, verifying and deploying control systems for agile modular manufacturing machinery are proposed in this paper. It introduces the concepts, operations, mechanisms and implementation techniques for integrating simulation environments and distributed control system environments so that the control logic programs that have been programmed and verified in the virtual environment can be seamlessly transferred to the distributed control system environment for controlling the real devices. The approach looks to exploit simulation in a much wider range of applications with great advantages in the design and development of manufacturing machine systems. In particular, it facilitates the verification of the runtime support applications using the simulation model before they are applied to the real system. Mechanisms that allow runtime data to be collected during operation of the real machinery to calibrate the simulation models are also proposed. The system implemented delivers a powerful set of software tools for realising agile modular manufacturing systems.     

基于FPGA和DSP的雷达模目信号设计

在雷达信号处理分系统调试时,经常用到模目信号。为了获得实时多波束雷达模目信号,提出一种基于FPGA和DSP的产生方法,利用FPGA产生时序及控制,DSP实时计算出所需要的回波,这样即使在没有阵面数据的情况下,仍然能够调试信号处理部分。该设计模块使用简单方便,只需通过终端键盘输入参数,即可实时产生所期望的回波,非常适用于雷达研制前期和系统联试时查找问题,而且模块做在脉压板上,不需要单独的插件。     

Technology 1991: industrial electronics

Progress in industrial electronics during 1990 is reviewed. Fuzzy logic, intelligent control, and computer-integrated manufacturing (CIM) are improving manufacturing flexibility and reducing costs. At the same time, advanced computer numerical control (CNC) based on a reduced-instruction-set computer (RISC) chip is expected to sharpen precision in high-speed machining. There were notable advances toward an open system architecture for programmable controllers and machine vision systems. An X-ray laminography system for inspecting the solder joints on printed-circuit boards, particularly those of surface-mounted components, with 25 μm resolution became available     

Control system for the waterjet cutting Machine

This paper addresses the field of factory automation within the scope of machine control. It presents the control system for a waterjet cutting machine. It involves a PC based computer numerical control (CNC) controller that has been built on a QNX real-time (RT) operating system platform. Microsoft Windows, which is a commonly accepted graphical user interface environment, serves as a human machine interface (HMI) front-end. The CNC controller and the HMI are interconnected by the Ethernet TCP/IP link. The control system is flexible and modular. It supports CAD/CAM and a network link to the office-level of factory automation. The application is thoroughly presented with the highlight on RT features; the QNX RT operating system is analyzed in detail. Moreover, Ethernet TCP/IP technology for the use in a networked automated factory is also put in the foreground.     

Multi-symbol-sliced dynamically reconfigurable Reed-Solomon decoder design based on unified finite-field processing element

Reed-Solomon (RS) codes play an important role in providing the error correction and the data integrity in various communication/storage applications. For high-speed applications, most RS decoders are implemented as dedicated application-specified integrated circuits (ASICs) based on parallel architectures, which can deliver high data throughput rate. For lower-speed applications, the RS decoding operations are usually performed by using fine-grained processing elements (PE) controlled by a programmable digital signal processing (DSP) core, which provides high flexibility. In this paper, we propose a novel m-PE multi-symbol-sliced (MSS) RS datapath structure. The m-PE RS architecture is a highly scalable design and can be dynamically reconfigured at 1-PE, 2-PE,...,m/2-PE, and m-PE modes to deliver necessary data throughput rate. With the help of the gated-clock scheme to turn off the idle PEs, the proposed runtime configurable ASIC design provides good tradeoff between the data throughput rate and the power consumption. Hence, it can save energy to extend the battery life of the portable devices. We demonstrate a prototyping design using 4 PEs by using UMC 0.18-/spl mu/m CMOS technology. The design can be dynamically reconfigured to be operated at 1-PE, 2-PE, and 4-PE modes, with performance of 140 Mb/s at 18.91 mW, 280 Mb/s at 28.77 mW, and 560 Mb/s at 48.47 mW, respectively. Compared with existing RS designs, the proposed m-PE RS decoder has better normalized area/power efficiency than most DSP-type and ASIC-type RS designs. The reconfigurable feature makes our design a good candidate for the error control coding (ECC) unit of the storage system in power-aware portable devices.     

Multiple digital signal processor environment for intelligent signal processing

We describe a novel, expandable, multiple digital signal processor (DSP) architecture with a symbolic processing host. A multiprocessor board, called Odyssey, based on this architecture has been developed to combine symbolic and real-time digital signal processing in a single computing environment. Some of the key features of the board are: 20 million multiply/accumulates per second, 512K bytes of data space, and expandability to 16 boards on a NuBus host. The DSPs used are the TMS32020 signal processing chips developed by Texas Instruments, and the host is Texas Instruments' Explorer, a LISP machine workstation. This provides environment to perform many intelligent signal processing tasks by associating meaningful relationships between quantitative (signal processing) and qualitative (symbolic processing) entities to develop inferences using expert system technology. Applications such as grammar-driven connected speech recognition, neural network simulation, EEG analysis, and generation of speech from general English text with natural language processing are some of the tasks that can utilize the computational power of the multiple DSP and/or the associated symbolic processing capabilities. Software development tools to implement applications include the device driver to facilitate communication between the host processor and the Odyssey board, a unique window-based debugger resident on the Explorer that allows for simultaneous state display of all the processors on the board, a FORTH interpreter for high-level language programming, and a cross-assembler/linker for assembly level programming.     

基于PLC的数控机床电气控制系统研究

为了提高数控机床的加工精度及安全可靠性,本文基于PLC对数控机床的电气控制系统进行设计,设计了上位机功能、PLC程序、伺服机构,并对系统的精度进行了验证,结果表明,数控机床的精度较高。     

基于3G网络的无线视频监控终端设计

本终端是集视频或数据采集、视频压缩、3G无线视频传输等功能为一体的数字视频监控终端,终端采用TVP5150视频解码芯片,将摄像机采集的模拟视频信号转换成数字信号输入到DSP中。通过在DSP中植入的H.264算法来压缩终端接收到的视频流,这能够满足高精度实时视频监控的需求。本终端整合了3G网络和Inter-net网络的优势,无论客户身在何处、在何时间,都可以迅速接入系统,随时随地进行远程监控管理。本终端可以通过短信、命令台控制、终端服务器、定时以及报警触发方式启动,同时可以实时采集现场数据。     

基于CPCI总线的通用FPGA信号处理板的设计

雷达信号处理的庞大数据量和高实时性要求,决定了雷达信号处理系统的复杂性及设计难度.由于通用信号处理板只需对软件进行升级,从而大大降低了系统设计的时间和成本,因此成为雷达信号处理系统设计的发展趋势.FPGA在实时处理上相对DSP更具优势,更适用于雷达信号处理中.文中采用Altera高端FGPA产品Stratix Ⅲ设计了基于CPCI总线的通用FPGA信号处理板,并实际应用于某雷达系统中.     

基于FPGA的多通道雷达数据回放系统设计

为解决雷达实时信号处理功能及性能有效验证问题,文中设计并实现了一种宽窄带一体化、多通道雷达数据回放系统。该系统按雷达工作的时序和数据率将雷达回波数据发送至实时信号处理系统,从而对目标跟踪场景进行复现,实现雷达实时信号处理功能及性能的有效验证。系统硬件平台由磁盘阵列服务器与两块PCIe光纤板组成。基于Xilinx系列产品,结合系统特点对PCIe DMA控制流程及响应机制做进一步调整,实现了服务器到光纤板的雷达回波数据高速批量传输。根据雷达工作机制及回波数据结构,设计FPGA回放控制状态机及相关功能模块,严格按照雷达工作的时序和数据率使雷达回波数据由光纤板传输至实时处理系统。分别设计软件同步控制方法和硬件同步控制方法,保证多板卡数据回放的同步性。测试结果表明,该系统实现了宽、窄带雷达回波数据的板间同步回放,各数据类型分别支持6路并行数据通道,数据回放峰值速率可达1 920 MB·s^-1。文中系统可依托雷达原有硬件平台实现,无需增设板卡和线缆,具有良好的集成性与通用性,目前已被应用于某多功能相控阵雷达中。     

Real-time digital signal processing-based optical coherence tomography and Doppler optical coherence tomography

We present the development and use of a real-time digital signal processing (DSP)-based optical coherence tomography (OCT) and Doppler OCT system. Images of microstructure and transient fluid-flow profiles are acquired using the DSP architecture for real-time processing of computationally intensive calculations. This acquisition system is readily configurable for a wide range of real-time signal processing and image processing applications in OCT.     

基于DSP的开关磁阻电机调速系统研究与设计

为对开关磁阻电机调速进行实时控制,设计了一款基于DSP的TMS320F2812数字信号处理器为控制核心,设计开发了开关磁阻电机调速系统。以模块化的思想设计了MCU控制系统、位置检测系统、不对称功率电路等模块。给出了软件设计的思想和方法,完成了嵌入式软件系统的开发。该调速系统结构简单、成本低廉、起动转矩大及调速范围宽等优点,具有很好的发展前景。     

基于DSP的高精度位置检测的实现

利用激光波长作为长度计量的基准虽然能够达到较高的精度,但是在高档数控机床中仍然需要进一步提高其精度。因此,提出了使用DSP（数字信号处理器）来处理数控测量中的关键的数值处理的方法——数据延时分析法,通过DSP的数值运算来代替电细分网络及其放大电路,实现信号的细分工作,从而取消了电细分的所有环节,完全没有直流漂移,大大提高了测量的稳定性和可靠性,能够有效地实现高精度、快速位移的测量,使测量分辨率达到0．02μm,最高位移速度达到100m／min以上。     

A modeling and analysis methodology for modular logic controllersof machining systems using Petri net formalism

Logic controllers for machining systems typically have three control modes: auto, hand and manual. In this paper, a unified formal representation of logic controllers with three control modes is provided using Petri nets (PNs). A modular logic controller structure is introduced and formalized for high-volume transfer lines. The modular logic controller consists of one control module for the mode decision and other control modules for station logic controllers. Each station control module is represented by connecting together operation modules, which are designed with respect to the fault recovery processes of operations; their connection algorithm is also provided. In our formal representation, each control module is represented by a live, safe and reversible PN. A condition for the modular logic controller to generate a correct control logic is provided: the operation causality condition. Using the modular structure of a logic controller, the control logic can be easily reconfigured and automatic code generation is possible     

A real-time multitarget tracking system with robust multichannel CNN-UM algorithms

This paper introduces a tightly coupled topographic sensor-processor and digital signal processor (DSP) architecture for real-time visual multitarget tracking (MTT) applications. We define real-time visual MTT as the task of tracking targets contained in an input image flow at a sampling-rate that is higher than the speed of the fastest maneuvers that the targets make. We utilize a sensor-processor based on the cellular neural network universal machine architecture that permits the offloading of the main image processing tasks from the DSP and introduces opportunities for sensor adaptation based on the tracking performance feedback from the DSP. To achieve robustness, the image processing algorithms running on the sensor borrow ideas from biological systems: the input is processed in different parallel channels (spatial, spatio-temporal and temporal) and the interaction of these channels generates the measurements for the digital tracking algorithms. These algorithms (running on the DSP) are responsible for distance calculation, state estimation, data association and track maintenance. The performance of the proposed system is studied using actual hardware for different video flows containing rapidly moving maneuvering targets.     

The swiss army knife of digital networks

This article describes a general discrete-signal network that appears, in various forms, inside many digital signal processing (DSP) applications. So the "DSP Tip" for this column is for every DSP engineer to become acquainted with this network. We show how the network's structure has the distinct look of a digital filter, a comb filter followed by a second-order recursive network. However, we do not call this unique general network a filter because its capabilities extend far beyond simple filtering. Through a series of examples, we illustrate the fundamental strength of the network: its ability to be reconfigured to perform a surprisingly large number of useful functions based on the values of its seven control parameters.     

基于PCB铣边机的铝基板机械加工技术

铝基板是一种最常见的金属基覆铜板，因其具有良好的导热性、电气绝缘性和尺寸稳定性，目前已被广泛应用。但铝基扳的机械加工在业内一直是个难题。传统数控机床多为单头加工，加工效率低，而普通的PCB铣边机又无法胜任金属加工，铣边后会产生大量毛刺，影响耐压测试。这些机床通常还需要额外的冷却系统处理加工时产生的热量，操作繁琐且易对板材、环境造成污染。文章通过在一种高性能PCB铣边机上对铝基板的机械加工工艺进行试验研究，提出了合理的加工工艺，在干式切削条件下实现了边缘无毛刺和精度控制的目标，解决了铝基板机械加工中的难题。     

LabVIEW在木工雕刻机主轴振动分析与研究

设计采用LabVIEW软件中集成的各种强大的虚拟仪器VI进行计算,对加速度传感器采集到的木工CNC雕刻机主轴电机振动信号进行分析,初步解决了CNC雕刻机主轴电机工作寿命过低的问题。本系统结构简单,编程方便,可靠性好,可快速完成分析信号的任务,有较强的使用价值。