基于声卡和LabVIEW的地震信号采集系统

介绍了声卡的技术参数和硬件结构以及声卡数据采集系统的软件实现方式。用计算机声卡代替普通采集卡作为硬件,用数据分析和处理功能强大的工程实用软件LabVIEW作为软件开发平台,设计了一个较高采样精度、中等采样频率、灵活性好的数据采集系统,实现数据采集、显示、存储与信号分析(时域分析和频域分析)等功能,并以此为平台实现了地震信号的外触发和连续方式的采集,该系统已用于实验课程的教学中。     

一种便携式冲击波超压测试系统

针对现在军用和民用对爆破的测量需求,提出了一种基于现场可编程逻辑门阵列FPGA和ICP传感器的便携式冲击波超压测试系统。测试系统主要以FPGA为主控芯片,采用ICP压电传感器,包含信号放大调理电路,AD转换电路,存储器模块以及工作状态显示电路。系统具有光触发、节点互触发和多节点同步触发等多种触发方式,连续重触发功能,以及多次采集时FLASH分块存储功能。系统上位机是以VC++为开发工具设计的软件,用于对数据进行分析、处理和显示。实验结果表明系统工作可靠,操作简便,能够实现对爆破冲击波超压的测试。     

基于单片机和EDA技术的逻辑分析仪设计

采用单片机控制8路逻辑信号电平采集；采用EDA技术设计的CPLD芯片处理逻辑信号，控制点阵扫描和分析结果在示波器上显示；单片机和CPLD间采用中断方式交换数据。该设计具有1、3级触发方式，触发字位置和浮动时标线显示等功能。     

简易等效采样数字示波器设计

系统以C8051f020单片机和FPGA为控制核心,主要包括输入调理、跟踪触发、信号采集、数据处理等模块,含有四个扫描时基档,三个垂直灵敏度档,具有波形存储、回放显示和频率测量等功能。     

基于Nios Ⅱ的嵌入式高速逻辑分析仪

文章介绍了如何在Cyclone芯片中嵌入和定制NiosⅡ软处理器,嵌入触发模块、数字锁相环和数据缓存模块,从而设计高速逻辑分析仪.分析仪能够采集速率高达50MBs的8路逻辑信号,并用LCD显示波形.也能够与PC机实时通信和数据传榆,用PC机完成对所测逻辑信号的存储、处理和显示.     

Blackfin533平台上的最小数字视频采集与显示系统

设计实现了一个在Blackfin533平台上的最小视频采集与显示系统.通过两个中断完成响应触发信号、视频帧采集、格式转换、显示等功能,并根据DSP结构对视频数据格式转换部分进行了优化.实验结果表明,该系统可获得更快的视频帧采集及显示速度.     

基于虚拟仪器技术的信号采集与分析系统的研究

应用LabVIEW开发平台,设计了基于声卡的虚拟信号采集与分析系统,并对信号采集性能进行了实验研究。构建的信号采集与分析系统具有信号采集、分析、波形显示、存储等功能。所设计的采集软件操作方便、交互性好,并且可以根据用户的需求进行功能扩充,为低成本下构建数据采集系统提供了一种思路,可以应用到语音识别、环境噪声监测和实验室测量等多种领域,应用前景广阔。     

基于S3C2410的毛细管电泳仪的信号采集系统

针对传统毛细管电泳仪信号采集系统体积大、效率低、成本高的问题,设计了一种便携式、多功能的毛细管电泳信号采集系统。该系统由采用ARM内核芯片S3C2410嵌入式微处理器与MAX132、CS8900A和光电倍增传感器等组成,实现了毛细管电泳信号采集、存储、处理及显示的一体化功能。     

基于LabVIEW的虚拟数字存储示波器的设计

利用 LabVIEW 强大的数据采集、处理和程序设计功能,设计、开发了一款数字存储示波器。它主要是由信号输入模块、数据处理模块和波形显示及存储模块组成,是通过软件编程实现信号的显示和测量等功能的。在虚拟示波器上集成的虚拟信号发生器可以在声卡采集和虚拟信号输入之间切换。实验结果表明,该虚拟示波器基本实现了传统示波器的功能,并且运行可靠、性能良好,能够满足普通实验室正常的使用需求。     

基于电荷输出型压电传感器的冲击波超压存储测试系统

针对集成电路压电（ICP）型传感器抗振动和抗热冲击性能不足的问题,实验对比了高阻电荷型与 ICP 型压电传感器的抗振动以及抗热冲击干扰性能,发现电荷输出型相比于 ICP 型压电传感器对复杂测试环境有较好的抑制作用。采用电荷输出型压电传感器设计了存储测试装置及其抗振动、防潮的保护外壳。实验表明：设计的存储测试装置能可靠触发,可实现冲击波压力信号的采集、显示和回读。     

基于VB机械优化设计软件的研究与实现

机械优化设计方法是现代机械设计过程中寻求最优化设计的一种重要手段。利用VB作为开发平台,以常用的最优化计算方法为基础,开发适用于机械设计过程中的优化软件,运用该软件能够满足机械设计过程中的优化要求。     

Model-based computer-aided design environment for operational design

To meet the increasing market challenges in chemical industry, it is imperative to improve process design and the supportive computer-aided engineering tools so that they can support lifecycle activities. This research work proposes detailed mechanism of operational design approach on the basis of operational design modeling methodology where lifecycle activities are considered during design stage. Computer-aided design environment called CAPE-CAD is proposed, which supports operational design approach. CAPE-CAD encompasses a friendly user interface to capture and maintain plant topology and to link process behaviors and plant operations with corresponding plant structure units. The proposed design environment can be used during design and operation stages, as well as for operator training. Case study of chemical process is used to explain the proposed solution.     

A computer-aided design system for framed-mould in autoclave processing

The general computer-aided design (CAD) software cannot meet the mould design requirement of the autoclave process for composites, because many parameters such as temperature and pressure should be considered in the mould design process, in addition to the material and geometry of the part. A framed-mould computer-aided design system (FMCAD) used in the autoclave moulding process is proposed in this paper. A function model of the software is presented, in which influence factors such as part structure, mould structure, and process parameters are considered; a design model of the software is established using object oriented (0-0) technology to integrate the stiffness calculation, temperature field calculation, and deformation field calculation of mould in the design, and in the design model, a hybrid model of mould based on calculation feature and form feature is presented to support those calculations. A prototype system is developed, in which a mould design process wizard is built to integrate the input information, calculation, analysis, data storage, display, and design results of mould design. Finally, three design examples are used to verify the prototype.     

Towards a communication model applied to the interface design process

The design of computational artifacts involves many communication acts occurring through different channels; usability tests, for example, have been used as a main communication channel between designers and users. Other channels used during the design process include requirement analysis, scenario construction, prototyping, etc. This work takes the Westley and MacLehan communication model and projects it into the context of interactive artifact design, resulting in a model of fractal nature. Some channels already present during the design process fit in well with the model we are proposing. It also reveals that other channels have not been explored in the global process of communication. Thus, we show how a semiotic-based analysis can unify techniques, methods and tools that support design, as well as make explicit the necessary interactions among designers, users and computers through different channels.     

An exercise in plausibility-driven design

The authors describe an evolutionary model of the computer design process and introduce the concept of plausibility of a design, which depends on the history of the design, where history refers to the recorded sequences of design decisions and the cause-effect relationships between design decisions, and the nature of the evidence used by the designer to justify design decisions and/or establish the fact that a design feature satisfies a particular set of requirements. The approach was used to design a special-purpose multiprocessor intended to serve as a computer architecture simulation engine (CASE). The authors present some of the main features of CASEs design as it evolved and, in the process, illustrate the practical application of the theory of plausible design     

自顶向下的计算机辅助工业设计几何建模研究

基于通用设计理论,研究了自顶向下的计算机辅助工业设计几何建模过程,采用面向设计演进过程的元模型和面向工业设计方面各侧面的子模型作为组织几何建模过程的抽象层次,提出了基于有向图的层次化几何信息模型,实现了对设计历史及意图的记录、不同层次几何信息间的关联以及按照元模型和子模型组织的自顶向下的计算机辅助工业设计几何建模过程。     

Software reverse engineering: A case study

This paper presents lessons learned from an experiment to reverse engineer a program. A reverse engineering process was used as part of a project to develop an Ada implementation of a Fortran program and upgrade the existing documentation. To accomplish this, design information was extracted from the Fortran source code and entered into a software development environment. The extracted design information was used to implement a new version of the program written in Ada. This experiment revealed issues about recovering design information, such as, separating design details from implementation details, dealing with incomplete or erroneous information, traceability of information between implementation and recovered design, and re-engineering. The reverse engineering process used to recover the design, and the experience gained during the study are reported.     

Structured synthesis of MEMS using evolutionary approaches

In this paper, we discuss the hierarchy that is involved in a typical MEMS design and how evolutionary approaches can be used to automate the hierarchical synthesis process for MEMS. The paper first introduces the flow of a structured MEMS design process and emphasizes that system-level lumped-parameter model synthesis is the first step of the MEMS synthesis process. At the system level, an approach combining bond graphs and genetic programming can lead to satisfactory design candidates as system-level models that meet the predefined behavioral specifications for designers to trade off. Then at the physical layout synthesis level, the selection of geometric parameters for component devices and other design variables is formulated as a constrained optimization problem and addressed using a constrained genetic algorithm approach. A multiple-resonator microsystem design is used to illustrate the integrated design automation idea using these evolutionary approaches.     

Cybernetic model of the design process

Computer-aided design can be seen as a process in which a careful integration of tje specific characteristics of man and machine is taking place. This integration may lead to better design results, quantitatively and /or qualitatively. The realization of this integration in c.a.d. systems necessitates a renewed and profound analysis of the design process. A model of the design process is developed against the background of the evolution of this process. To this end, cybernetics is used as a meta-language. The development of c.a.d. systems based on this model is discussed.     

A knowledge-based process planning system for injection mold

The goal of this study is to develop a knowledge-based process planning system interfaced with design for injection mold. Mold parts are interactively designed by using feature-based design approach, and then a part feature database is created through a data conversion module. Attribute information of the database is used as an input for the expert process design module and the standard time estimation module of the knowledge-based process planning system developed in this study. In this developed system, decision making of process design is performed by rules which were acquired from experienced process planners through interviews, and machining operation time is estimated by using empirical formulas derived from the actual shop floor data. A case example of split cavity plate is used to demonstrate the system performance.