多点应变长期测试的研究

本文明确提出了应变长期测试这一问题，并对应变长期测试的定义作了量化处理。本文分析，计算了现有应变测量方法和测量系统用于应变长期测试将带来的巨大误差，并提出了作者对解决应变长期测试这一难题的思路和看法。     

基于UVM的FPGA通用接口测试平台设计

采用层次化设计、通用数据库共享、事件同步化处理、脚本执行等方法,研究了在UVM验证平台中引入高层次化序列分类设计,利用一种通用数据库共享方式替换专用端口进行组件间的信息传递,通过事件触发方式解决组件间的同步化,克服了平台难以适应多重验证环境的局限性,实现了测试指令与测试设计分离,测试设计与被测设计分离,测试平台的可重用性得到进一步提升.平台提供可视化的人机交换界面和脚本命令两种执行方式,通过项目测试结果分析和对比,新的平台克服了UVM验证平台的复杂性,具有简洁、透明的处理方式,能够同时满足多种接口测试需要,是一种建立FPGA通用接口自动化测试平台的有效方法.     

基于动态电路的高速发送端设计

为了降低高速串行接口中发送端的延迟,在研究、分析现有发送端结构的基础上,提出了新的数据跨时钟域传输方法并在实际电路中得到实现。此方法可以大幅降低数据跨时钟域传输时用于异步FIFO的延迟。而且,使用动态电路对高速发送端并串转换电路进行了晶体管级的改进,放松了关键路径的时序要求,使发送端整体电路能运行在更高的频率下。发送端电路使用40nm CMOS工艺实现,实际芯片测试数据表明,使用该电路的发送端可以稳定工作在13Gb/s的速率下。     

多点应变长期测试的研究

本文明确提出了应变长期测试这一问题，并对应变长期测试的定义作了量化处理。本文分析、计算了现有应变测量方法和测量系统用于应变长期测试将带来的巨大误差，并提出了作者对解决应变长期测试这一难题的思路和看法。     

基于DSP和FPGA的多通道信号采集模块设计

设计了一种基于TIDSPTMS320C6713B和ALtera Cyclone系列FPGA的数据采集模块,使用FPGA做多路串行AD器件的信号采集控制和数据缓冲,同时利用DSP的DMA直接接收采样数据和进行数据处理,缓解了DSP数据传输的压力,提升了数据处理的效率,也提高了整个采集模块的性能。     

一种用于长期应变测试的自动测量装置

利用单片机及电桥设计了一套一种用于长期应变测试的装置,克服了用应变仪测量应变产生的误差,并把检测结果通过串行通迅送入计算机,用计算机存储、显示、打印测量结果.     

基于无线网络的石油井架应变测试系统的试验

针对传统有线应变测试系统在石油井架结构安全检测中存在的问题，设计了基于无线网络的石油井架应变测试系统。重点阐述该系统的组成、系统的硬件和软件设计以及网络通信协议设计。最后，对系统进行了测试。研究结果表明：这种无线测试系统比常规测试更便捷，具有高效、可靠、低功耗、测试精度高、稳定性强等优点，适合在石油井架结构井场测试中应用。     

一种基于VB的多路应变数据采集系统设计

针对传统应变测试仪通道少、测量麻烦且价格昂贵等问题,提出了一种多路应变数据采集系统.系统采用电阻应变式传感器测量构件的应变,利用成熟的数据采集技术以及模块化的硬件设计方法,完成了多路应变数据的实时动态采集,并使用VB6.0作为开发工具,实现了数据滤波、标度变换等一次处理.通过实际应用,表明该系统性能稳定,操作简单,系统处理后的数据为机械构件的受力分析提供了依据.     

极紫外成像仪信息处理FPGA仿真测试与验证

为保证软件可靠性,仿真测试成为FPGA设计开发中不可或缺的重要环节。结合用于地球等离子体层探测的极紫外成像仪项目,对其信息处理FPGA进行代码规则检查、静态分析、波形仿真等仿真测试,测试结果表明FPGA设计满足功能和性能需求,通过成像实验验证FPGA工作正常、可靠。     

基于F-P标准具和Music算法的FBG动态应变传感系统

提出了基于可调光纤环形激光器结构,并采用F-P标准具解调的光纤布拉格光栅(FBG)动态应变传感系统,具有高达60 dB的光学信噪比.F-P标准具用来作为一个边缘滤波器探测FBG波长的漂移,这样的解调方式具有稳定性高的优点.为了提高动态应变测量系统的分辨率,采用了Music算法进行频谱分析.实验结果显示,在700Hz时的动态应变分辨率达到了0.1με/Hz~(1/2),是传统FFT算法的10倍.     

基于FPGA的实时图像采集系统设计

本文主要介绍了基于FPGA用视频解码芯片设计实时图像采集系统的方案和工作原理.     

基于FPGA的金属膜厚检测系统

根据多频电涡流检测原理,设计了基于FPGA的检测系统,实现了涡流传感器的多频激励和阻抗分析,发现传感器的峰值特征频率与被测金属膜厚相关,进而从峰值特征频率捡取金属的膜厚信息.通过对多层铝箔进行测量实验,并采用保形拟插值对实验数据进行拟合,得到满意的测试结果.系统基于FPGA架构,可实现对金属膜厚度的实时、在线测量.     

Calibration of a Speckle Interferometry Full-Field Strain Measurement System

Abstract:  This study describes the calibration of a full-field speckle interferometry strain measurement system using the calibration specimen and protocol defined in the Standardisation Project for Optical Techniques of Strain measurement (SPOTS) standard. The specimen was based on the monolithic embodiment of a four-point bending test and was manufactured from aluminium following the SPOTS design. Strain-gauge rosettes attached to the upper and lower faces of the beam were used to derive two correction factors of an analytical expression that predicted the strains generated in the gauge section of the beam. Following the SPOTS protocol, the comparison of measured and predicted strains yielded two fit parameters and their associated uncertainties for each of three displacement-load steps which indicated the closeness of the data sets. An acceptable calibration was achieved for the single normal component of in-plane strain considered in this study, for each load step employed. For the highest load range, which generated a maximum strain of approximately 810  μ strain in the gauge section, the overall calibration uncertainty was found to be 35.3  μ strain, which in relative terms can be expressed as 2.2% of the strain measurement range for which the instrument was calibrated.     

Multichannel Strain and Temperature Measurement System for Structural Elements

he paper describes a 32-channel system for studying full-scale structures developed with the use of the state-of-the-art components. It provides continuous long-term measurement of strains and temperatures up to + 350°C and accumulation and storage of measurement data. The system was used to record the elastic strains and temperatures of a welded joint of the hot collector to the PGV-1000 steam generator nozzle in the period between the preventive maintenances. The measurement results reveal a complex pattern of strain and temperature distribution different from the axisymmetric one.     

Strain Measurement Techniques in Explosives

Abstract:  Experiments to visualise the detailed microstructure of highly heterogeneous plastic-bonded explosives have utilised high-resolution moiré interferometry to measure localised deformations under quasi-static loading. The information obtained has proved valuable in the development of finite element material models, and offers the potential to isolate and examine the influence of particular microstructural features (like binder layer thickness, or explosive crystal size) on deformation characteristics. New insight into failure processes and the implications of ageing effects have been obtained. The experimental methods and modelling have broad applicability to microstructural studies of a variety of composites.     

Local Strain Measurement within Tendon

Abstract:  Tendon is a dense connective tissue, responsible for transmitting the forces generated by muscles to the skeleton. It is composed of a hierarchical arrangement of crimped collagen fibres, interspersed with proteoglycan matrix and cells, known as tenocytes. During physiological loading, tendons are subjected to strains in the region of 5–6%, which result in the straightening and realignment of the collagen fibres, generating variable local strain fields within the tendon. This study demonstrates a technique for analysing local strains within viable tendon explants, during both loading and unloading of the tissue. Samples were strained in a custom-designed rig, allowing real-time visualisation of cell nuclei, used as local discrete markers, on a confocal microscope. Results indicated that local strains within the fascicle are smaller than the applied strains, never exceeding 1.2%, even at 8% gross applied strain. By contrast, the sliding of adjacent collagen units was recorded at each strain increment in this study, reaching a mean maximum of 3.9% of the applied displacement. Loading–unloading studies indicated that sliding behaviour is reversible up to strains of 5%, and provides the major extension mechanism within the rat-tail tendon. This technique can be extended to further analyse shearing behaviour within the matrix.     

基于ARM与FPGA的主飞行仪显示系统的设计

为了提高现代主飞行仪显示系统的时实性和满足智能化、小型化的要求,利用ARM9的高主频特性和FPGA的高协处理能力,设计了以ARM微处理器和FPGA芯片为核心的飞机座舱显示系统.通过对典型实例的测试,系统可以实现图像的实时显示,验证了该方法的可行性和有效性,并为显示系统的多任务处理等智能化发展有一定探索意义.     

一种基于应变测量的放入式电子测压器设计

目的：设计一种新型的放入式电子测压器。方法：直接利用测压器的外壳来作为应变式压力传感器，代替了压电式压力传感器，结果：给出了这种传感器的灵敏度和动态响应频率。结论：这种基于应变测量的放入式测压器具有结构紧凑，成本低的优点。     

FPGA在高性能数据采集系统中的应用

设计了以FPGA(现场可编程门阵列)为核心逻辑控制模块的高性能数据采集系统,该系统除了可完成24路最大采样频率为100kHz(精度16位)的模拟信号采集和8路宽范围频率信号采集,还具有较强的数字信号处理能力和一定的容错、自检功能。FPGA模块采用VHDL语言设计,在MAX PLUSII集成环境中进行软件设计和系统仿真,本文给出了FPGA主要功能模块的仿真图形。