查询词典 computer-aided design

The foundation of this system provides a good reference to promote the standardization and intelligence of the overhaul and maintenance of vacuum switches. This paper develops a special HF pulse power supply for internal pressure estimation, which achieves the output of HF-HV sinusoidal pulse wave whose frequency and amplitude can be modified respectively, and meets the design requirements according to the results of Simulink simulation and practical experiments. With the help of AT89S52, this paper designs an I~2C serial bus based signal detection system for peak value signal acquisition of HF pulse currents, which communicates with the upper computer by asynchronous serial communication for uploading the data. In the upper computer, a human computer interface is developed by Matlab software, whose functions are to do some computation and graphic display, such as calibrating the relation curve of vacuum degree and peak value of HF pulse currents, vacuum degree computation, and vacuum lifetime evaluation analysis basing on grey forecasting model as well as making relative suggestions.

本文研制了用于真空度检测的高频脉冲电源，通过Simulink仿真和试验检验其满足设计要求，实现了电压幅值和频率独立可调的正弦波高频高压脉冲输出；利用以AT89S52为核心基于I~2C串行总线的信号检测系统实现高频脉冲电流峰值信号的采集，通过异步串行通信实现单片机与计算机之间的数据通信，将检测数据传至上位机；在上位机利用Matlab开发人机交互界面，实现相关数据处理和图形显示，包括真空度——高频脉冲电流峰值关系曲线标定、真空度数值计算、基于灰色预测模型的真空寿命评估分析和提出相应决策建议。

This thesis introduces its OBC (on-board-computer),the micro-satellite adopts centralized computer to control.We use standby redundant computer system and fault-tolerant software/hardware co-design method to improve the reliability.

由于卫星采用了计算机集中管理方式，为保证星载计算机的可靠性，设计中对硬件使用了双计算机热备份冗余设计，星载计算机的可靠性同时通过软件和硬件协同容错设计来实现。

The innovation and the breakthrough point of the system research chiefly shows in: finding out the effective forecasting technique of formation, oil and gas water bed and formation pressure , internal/external sharing of data, automatic examination of related data, automatic drawing of three kinds of graph, automatic showing the well position on the structure well position map according to the designed coordinate of well,pretreatment technology of design, generating of design book, mixed arrangement of graph and text, transmission and examination of design book on net, computer management of design book and data, on net query, data compressing technology, etc.

系统研究的创新和突破点主要表现在：总结出一套行之有效的钻遇地层、油气水位置预测方法和根据邻井综合录井资料预测地层压力方法，开发了系统数据内外部共享和相关数据的自动校验、三种图件的自动绘制和在构造井位图上根据设计井座标自动展井位、设计预处理、设计书的生成和图文混排、设计书网上传输和网上审批、设计书和数据的计算机管理和网上查询、大数据压缩等技术。

This design topic is the Design of Lifting Mechanism for ZYD 600SB Hydraulic Static pile Driver .it mainly includes three partial contents: Host computer design, hydraulic system design, control section design.

摘 要 ：本次设计的题目是ZYD600SB 液压静力压桩机的升降行走机构的设计，它主要包括三个部分的内容：主机的设计，液压系统的设计。

In chapter Ⅰ, a historial review of structure control is given; In chapter Ⅱ, A discussion of the controllability and observablity of flexible structures is given, Two kinds of controllability and observablity index are defined, and applied to actuator allocation; chapter Ⅲ considers the reduction of high order flexible structure mode; the content of chapter Ⅳ is about the basic problem of distributed parameter control system design. It is proved that a stable controllor in mode space may be unstable in real use in distributed paramater systems, also, by closed loop mode concept, a pole assignment method of flexible structure controllor design is given; chapter Ⅴ is about the low-authority controllor design, it is pointed out by use of high order eigenvalue/eigenvector perturbation, a better controllor can be designed; chapter Ⅳ considers flexible structure reduced order control; chapter Ⅶ disscusses the basic problem of flexible structure computer control, analyses discreate controllablity and observablity and its computing, the sample period and coefficient wordlength; chapter Ⅷ is on the problem of low flexibility compensation; chapter Ⅸ is a design example.

在第一章简要回顾了挠性结构控制的历史，并且指出控制中的一些问题；第二章讨论了挠性结构的能控性与能观性，定义了两类能控性程度和能观性程度指标，还将能控性程度概念应用于执行器位置的确定；第三章论述了高阶模型的降价问题，比较了适于挠性结构模型降阶的方法，指出其适用范围；第四章内容是分布参数系统设计的基本问题，首先证明在模态空间中设计的稳定的控制器在实际分布系统上可能是不稳定的，进而根据闭环模态的概念，获得挠性结构控制器设计的极点配置方法；第五章的内容是关于低权控制器的设计问题，指出利用特征值高价摄动和特征向量的摄动，可以设计出更加完善的低权控制器；第六章讨论挠性结构降阶控制问题；第七章讨论挠性结构计算机控制的基本问题，分析了时间离散化模型的能控性和能观性及其计算问题，讨论了采样周期选择和系数字长问题；第八章讨论低挠性结构的补偿问题；第九章的设计例子用来说明第二章和第四章的结果。

How to launch new products in the shortest time, in the best quality, at the lowest cost become the focus of competition, along with increasingly acute market competition. Whatever fruits of science and technology were transformed into competitive commodities, design work pivotally extraordinarily. Every country in the world pays attention to design work. As a result of the development and application of control technique, computer technology, applied mathematics, design means has changed rudimentary. New theory and technology of design come forth ceaselessly.

随着市场竞争日益剧烈，如何以最短的时间、最高的质量、最低的成本将产品投放市场成了竞争的焦点，任何科技成果要转化为有竞争力的商品，设计起着极其关键的作用，世界各国都十分重视设计工作，由于控制技术，计算机技术和应用数学的发展和应用，设计手段发生了根本性变化，设计新理论、新技术不断涌现，逐步地形成和创建了一系列包括脑力劳动自动化和各种人工智能为特征的现代设计方法和技术。

Germany ancient to rise fort invent metal type printing leave the sign on graphic design with computer with the 15th century, can divide graphic design into 3 stages: Tradition design era, is it design era and figure design era to print.

以公元15世纪德国古腾堡发明金属活字印刷和电脑参与平面设计为标志，可以把平面设计划分为3个阶段：传统设计时代、印刷设计时代和数字设计时代。

In the product design, uses modular, the parametrization 3D computer design system to carry on the modelling design, may personalize has custom-made, the image is lifelike, the effect is direct-viewing; On the production equipment, has provided the precise numerical control machinery, including the numerical control plate cutter, the numerical control knee bend machine, the numerical control key seating machine, the plasma cutter and so on, has the advanced working capacity; In the technical strength, has one batch of collection design, the manufacture, the installment is a body, experienced professionals.

在产品设计上，采用模块化、参数化的3D电脑设计系统进行造型设计，可以个性化定制，形象逼真，效果直观；在生产设备上，配备了精密的数控机械，其中有数控剪板机、数控折弯机、数控开槽机、等离子切割机等，具有先进的加工能力；在技术实力上，拥有一批集设计、制造、安装为一体，经验丰富的专业技术人员。

This design topic is the entire plunger elevator design, it mainly includes three partial contents: Host computer design, hydraulic system design, control section design.

本次设计的题目是全液压升降机的设计，它主要包括三个部分的内容：主机的设计，液压系统的设计，控制部分的设计。

Main points of the thesis are as follows:(1) The main function models and information relations between these models in the CAPP system in the integrated CAD/CAM project are explained, a new process plan design method is mentioned based on analyses of process plan design. This method is based on the process plan prototype, and develops the prototype little by little until the perfect process plan is completed, the prospect of this method is discussed;(2) The feature abstracting rules and methods are studied, a feature coding system is developed based on GT, all the defined feature models are described by the mathematical methods;(3) The integrated method of CAD/CAPP based on features is mentioned, this method defines a feature exchanging model, and develops an interface software to exchange design data into technology data base, this technology data base includes the design and technology information of the parts;(4) The process plan reasoning method based on features is created, this method uses Mycin algorithm to solve the reasoning of the feature process plan. A process plan making system is developed. In this system part process plan is made by the semi-intelligent method, this method uses the feature reasoning, feature process chain searching and man-computer talking together;(5) The main structure of the HOPE system is introduced, a shaft drawing and its process plan made by this system are shown, the data process problem in process drawing making is also discussed;(6) A new method of describing process rule is introduced, this method uses IfThen rules and neural nets weight values together to describe process rules, the BP algorithm is adopted in this method;(7) The optimal machining sequence problem of the process steps on the same fixturing is discussed, optimal algorithms SA is applied to solve this problem, the result shows that this method is more efficient than the traditional method;(8) All jobs in the thesis are summarized. In order to carry out the research in the future, some rational proposals are given.

全文论述的内容主要有下列几个方面：(1)较为系统地阐述了CAD／CAM一体化工程项目中CAPP系统的主要功能模块及其信息流程，在分析工艺设计过程的基础上，提出了基于特征原型的渐进式工艺设计方法，并探讨了该方法的应用前景；(2)研究了零件特征提取的原则和方法，在成组技术的基础上，开发了一套基于特征的分类编码系统，并在提取零件特征的基础上，定义了零件特征的数据模型，开发了基于轴类零件特征的参数化设计系统；(3)研究了基于特征的CAD／CAPP集成的方法，通过定义零件特征数据模型的存储结构，开发了将设计数据转换到工艺数据库中的接口程序，为后续的CAPP系统提供必要的零件形状和工艺信息；(4)研究了基于特征的工艺推理方法，将Mycin算法应用到工艺决策中，开发了基于特征的工艺推理及工艺方案生成系统，在系统中综合运用特征推理、特征加工工艺链查询及人机对话相结合的半智能化方法确定零件加工工艺；(5)介绍了整个HOPE系统的总体结构，通过运行HOPE系统绘出了一轴类零件的零件图，并生成了该零件的加工工艺方案，初步探讨了基于特征的工序图生成技术中数据处理问题；(6)研究了工艺设计过程中知识如何有效表示的问题，提出了将显式的IF-THEN规则表示与隐式神经网络权值表示相结合的工艺知识表示方法，并利用BP算法进行了工艺知识表示的初步研究；(7)研究了工艺设计过程中同一安装下工步优化排序问题，利用神经网络中基于模拟退火的理论来解决该工步优化排序问题，实践证明该方法较传统的算法具有更高的效率；(8)总结了本文所进行的研究工作，为今后进一步开展工作提出了较为合理的建议。

Plunder melds and run with this jewel!

掠夺melds和运行与此宝石！

My dream is to be a crazy growing tree and extend at the edge between the city and the forest.

此刻，也许正是在通往天国的路上，我体验着这白色的晕旋。