导　　师： 孙和义

学科专业： 080402

授予学位： 硕士

作　　者： ;

机构地区： 哈尔滨工业大学

摘　　要： 近年来,CNC齿轮测量中心以其测量精度高、速度快、功能强等优点,得到了迅速的发展。同时,人们对齿轮测量中心的测量速度提出了更高的要求。齿轮测量中心测量速度的提高,需要有良好的数据采集系统,来保证在高速测量时数据的采集和传输。本文针对CNC齿轮测量中心在高速测量的情况下对数据高速、同步和等间隔数据采集的需求,研制了一套数据采集系统。 本文简要介绍了CNC齿轮测量中心的发展现状及数据采集系统的研究现状,通过对CNC齿轮测量中心工作原理的分析,结合最新型CNC齿轮测量中心的技术指标,确定了数据采集系统所需要的技术指标。根据技术指标,确定了以FPGA为控制核心的数据采集系统。 本数据采集系统需要采集的信号包括三路测头信号和四路光栅信号。在硬件电路中,三路测头信号经过信号调理后,由FPGA控制MAX195实现模数转换。四路光栅信号经过差分接收器MC3486后,在FPGA内进行数字滤波、四细分辨向和可逆计数等处理。同时,FPGA还实现了七路信号的同步锁存,单点和连续两种数据采集方式的控制,数据采样速率控制,FIFO读写控制,PCI总线接口控制等功能。软件设计包括PCI总线驱动程序的开发和上位机应用程序开发。采用了DDK开发软件包开发WDM类型PCI总线驱动程序。应用程序使用Visual C++6.0开发,实现了应用程序与数据采集系统的数据交换。并在应用程序中对采集的数据进行等间隔处理。 通过实验证明,数据采集系统采集测头数据的标准差为0.06μm;光栅信号的等间隔标准差在0.4μm范围内;系统对七路数据同步采样频率可达到10KHz,能够满足齿轮测量中心在测量速度为20mm//s,采样间隔为20μm的条件下进行测量。系统达到了预期设计的目的。 Recent years has witnessed a rapid development of CNC gear measuring center which features high measuring accuracy and speed as well as powerful function; meanwhile, people has put forward new demand for the measuring speed of the center. The speed upgrade requires a sound data acquisition system to ensure the data acquisition and transmission during high-speed measuring. The paper researches into a data acquisition system in accordance with the requirement for simultaneous, high speed and equal interval data acquisition in high-speed measuring of CNC gear measuring center. This paper gives a brief introduction of the present status of CNC measuring center and the data acquisition system. Through analysis of recent CNC operating mechanism in combination with the technical specification, the required technical specification for the data acquisition system has been fixed; and consequently, the system with FPGA as the control core has been determined. Signals captured by this system include three-channel probe signal and four-channel grating signal. In hardware circuit, the three-channel probe signal is first signal-adjusted, and then realizes modulus converting by MAX195. The four-channel grating signal passes the differential receiver MC3468, and then goes through digital filtering, four segments raster-sensing and reversible counting in FPGA; at the same time, FPGA has also realized such functions as simultaneous latch of seven-channel signals, control of single-point // continuous data capture, control of data sampling speed, FIFO read-write control and PCI bus interface control. Software design includes the development of PCI bus device driver and the development of upper computer application. Driver Development Kit /(DDK/) is used in the PCI bus device driver of WDM type. Visual C++ 6.0 is adopted to achieve data exchange between application and data acquisition system, and equal-interval processing is taken to the data captured in application. Experiments have proven that the data acquisitio

关 键 词： 数据采集系统

领　　域： [自动化与计算机技术] [自动化与计算机技术]