液压传动系统的简要论文.doc

液压传动系统论文以下资料为精心收集整理，免费提供给大家，建议可以先下载再阅读，包含了经验心得、选题指导、参考文献、范文还有格式整理的技巧，对论文写作绝对非常有用，如果对论文还有什么不明白的，可以直接搜索品学论文网上查看对应专业的范文或者直接咨询在线指导老师。【写作论文前必看品学论文网老师总结的论文写作经验】 1.论文写作万不可抄袭。大家着手准备论文时，首先就是寻找参考资料和范文，借助搜索引擎的强大，我们能够在网上搜索到非常多的参考文献和资料，但是来品学论文网的同学们通常遇到的问题就是对参考文献和范文不能合理利用，想偷工减料，直接借用是非常常见的。现在无论是本科论文还是硕士论文都会通过抄袭检测软件查重，直接影响到毕业。所以请大家务必重视。 2.论文需要创新，不能随大流。这点大家都能想到，如果跟你同学的题目或者内容一样，肯定不会的高分，论文的创新可以从提出新的观点，结合案例分析，用一些数据分析工具，结合新的理论等方面进行。 3.如何快速写作论文。如果你仅仅是想毕业，而不是做出杰出的科研成就，那么就少看一些正规的论文写作方法。首先，找出一堆最新的参考文献与范文，最好是近2年的，如果太老旧，肯定在网上传遍了，可能你同学也在用，最近范文可以在品学论文网的数据库中搜下；然后，通过结合多篇文章给自己拟个题目和提纲，与别人的论文区别开来最重要的就是提纲的写作，一定要细分到三级提纲；以下是品学论文网该专业众多范文中的一篇：基于Windows操作系统的开放式数控系统毕业论文 【论文内容】现代机械制造工业对数控系统提出了更高的要求,设计和开发一种可根据用户需求,迅速建立一个开放式的原型数控系统,适应市场对产品多样化的需求,成为数控系统的发展方向。Windows操作系统具有多任务操作特性,支持多线程,可实现数控系统实时多任务控制,因此在Windows操作系统平台下研发开放式数控系统是一个重要发展方向。本文完成的主要研究工作如下:1.在全面分析开放式数控系统的发展趋势以及传统数控系统存在的不足的基础上,提出了基于Windows操作系统平台,采用IPC机+运动控制卡模式和主从式结构对开放式数控系统进行了研究和开发。其中以GT-400-SV运动控制卡作为数控系统下位机的核心,构成多轴运动实时控制单元;以IPC机作为上位机进行非实时性任务的处理。通过总线通讯和双端口RAM通讯方式,以及制定的上下位机数据传送通讯协议,保障了上下位机的实时数据通讯,实现了直线和圆弧插补,运动加减速控制等实时运动控制内容。在需求分析的基础上,以IPC为硬件基础,根据数控系统功能设计了系统层次结构模型,给出了系统的拓扑结构和系统开放性的实现方法,进行了系统硬件和软件的总体设计。2.在硬件体系结构上,采用模块化方法搭建和扩展硬件系统。选择IBM-PC总线作为功能模块连接的总线标准,选择具有多个EISA插槽的母板构成硬件连接底板,插接符合标准要求的微型计算机板(上位机)和运动控制卡(下位机),搭建了基本的数控系统构架。用户能够通过插接符合IBM-PC总线标准的功能板块扩展数控系统的硬件,组成满足自己要求的系统,实现了硬件的开放性。3.在软件体系结构上,上位机运行主流的Windows操作系统,下位机运行c/OS嵌入式计算机实时操作系统。将数控系统的软件功能,根据时间紧迫要求,划分为强实时性任务、弱实时性任务和非实时性任务;根据对硬件I/O的操作要求,划分为操作类和非操作类。将实时性强的和I/O操作的功能主要安排给运动控制器执行。对各功能进行分类封装,建立了通用类库。定义了应用程序编程接口(API),通过该接口能把用户专用软件模块扩展到系统中,使系统达到了一定的开放性。4.针对数控系统多任务控制这一特点,对Windows平台下的多线程技术、任务调度策略以及进程间的通讯进行了深入的分析。进而根据数控系统的功能特点,把系统任务分为系统总控进程、人机界面进程、轨迹规划进程和运动控制进程,各进程又划分功能相对独立的子线程,通过设定线程的优先级,利用多线程调度策略和中断机制技术,实现了对数控系统弱实时任务的控制,利用下位机实现了对数控系统强实时任务的控制。系统采用消息、共享内存和命名管道三种通讯机制,实现了进程间的通讯,保障了各功能模块协同完成加工任务。5.在数控系统软件开发上,以VC+为开发工具,以面向对象的模块化方法设计了人机交互界面软件模块、加工程序预处理模块、译码模块和插补模块,实现了上位机对数控加工代码的编译、系统参数设定和刀具补偿等功能;开发了运动控制功能模块,实现了数控系统的回参考点、点动控制、增量控制、运动加减速控制、主轴控制、进给量调整等基本功能。调试结果表明,采用运动控制卡+IPC机模式,以运动控制卡为系统实时运动控制的核心构建和设计的数控系统,软件系统人机界面友好,组件维护方便,实现了多种运动控制功能,使系统具有一定的开放性。 【英文摘要】 Modern machinery manufacturing industry has brought forward higher request to numerical control system, which can according to consumers request to design promptly an open numerical control system prototype to adapt to the market request for diversifies product. It has become the direction of numerical control system development. Windows OS has multi-job operating characteristics and supports multi-thread that may realize real-time multi-job control of numerical control system. So under the Windows OS platform, it is an important development direction of open numerical control system. This article completed main research work as follows:1.In view of comprehensive analysis development trends of open style numerical control system as well as shortcomings of the traditional numerical control system, this article put forward to based on Windows OS platform and used IPC machine+motion control card mode and master-slave structure of NC system to research and develop the open numerical control system. With GT-400-SV motion control card as the CNC machines next-bit machines core, a real-time multi-axis motion control unit was constituted. With IPC machine as the host computer, the tasks of non-real time were carried out. Through the bus communication, dual-port RAM communication and the development of the upper and lower machine data transmission protocol, the article ensured upper and lower machine real-time data communication. A linear and circular interpolation, motion acceleration and deceleration control of the content of real-time motion control were achieved. Based on the analysis of demand, with IPC as the hardware foundation, according to numerical control system functional, the system hierarchy model was designed. The system topology structure and implementation of an open approach to the system were given. The hardware and software structure of system were designed.2.In the hardware architecture, the modular method was used to build and expand the hardware system. IBM-PC bus standard was chosen as functional modules connected standard bus. A number of EISA slots were selected to constitute a hardware connection motherboard. The basic framework of CNC was built by plugging the standard request of micro-computer board (the upper machine) and motion control card (the lower machine). Users can expand the numerical control systems hardware by plugging functional blocks which conform to the IBM-PC main line standard to satisfy system requirements. The openness of system hardware was realized.3.In the software architecture, the upper computer ran mainstream OS. The lower machine ranc / OS real-time embedded computer operating system. According to the time constraints of software functions of CNC system, they were divided into strong real-time tasks, weak real-time tasks and non real-time tasks. According to the hardware I/O performance requirements, they were divided into operating and non-operating category. Motion controller carried out strong real-time and I/O operations tasks. Various functions were encapsulated. A common functional class library was established. Application programming interface (API) was defined which users could extend the user-specific software function to the system. The certain openness of system was enabled .4.In view of the characteristics of multi-task control of numerical control system,under the windows platform,the multi-threading, task scheduling strategy and the inter-process communication were deeply analyzed. Then according to the characteristics of numerical control system function, the system tasks were divided into system overall control process, the human-machine interface process, the trajectory planning process and motion control process. Each process was also divided into relatively independent of functional sub-thread. The CNC system realized the weak real-time control tasks by setting the thread priority, using multi-threading scheduling policy and interrupt mechanisms. The CNC system realized the powerful real-time control tasks by the lower machine. The inter-process communication were realized by using the messages, sharing memory and named pipeline three kinds of communication mechanisms. The system made each functional module coordinate to complete the processing tasks.5.In the numerical control system software development, the VC+ was taken as the development tool. The object-oriented modular method was used to design the human-computer interaction interface software modules, processing pre-processing module, decoding module and interpolation module. The upper machine to numerical control processing code compilation, system parameter settings and tool compensation function were achieved. The motion control functional module was developed. The numerical control system realized many basic functions, such as return to the reference point, jog control, incremental control, the moving control of acceleration and deceleration, spindle control, the feed adjustment function and so on.The debugging results indicated that the numerical control system was built and designed by using motion control card + IPC machine pattern. Motion control card was taken as real-time motion controls core of the system. Software system man-machine interface was friendly. The components maintenance was convenient. Many kinds of motion control functions were realized. It made the s