【作者】 程菲菲；

【导师】 陈静；

【作者基本信息】 武汉理工大学 ， 控制理论与控制工程， 2007， 硕士

【摘要】 混凝土作为一种建筑材料广泛地应用于我国基础设施建设中，然而混凝土建筑物出现裂缝的现象十分普遍，因此，对混凝土抗裂性能的研究显得尤为紧迫和突出。对混凝土抗裂性能的深入研究，可定量评价水泥混凝土的抗裂性能，为混凝土设计与施工提供准确的指导，并为原材料的选用与配合比提供可靠的依据。本文为温度—应力试验机温湿控制系统中的一个横向课题。针对目前便携式数据采集系统存在的关键问题，结合基于DSP的便携式数据采集系统的主要功能，选用USB2.0总线作为开发数据采集系统的接口总线，设计了数据采集系统的系统结构和软件构架，完成了基于DSP的便携式数据采集系统的硬件设计和软件设计，具体内容如下：基于DSP的便携式数据采集系统的硬件设计为本文的重点，分为数据采集模块、数字信号处理模块、USB接口模块等3部分进行。数据采集模块主要完成模拟信号的隔离、放大以及采样，16路模拟信号由4片A／D转换器采样后送入板卡的数据总线；数字信号处理模块主要包括DSP的存储扩展、与PC机的串口通讯及DSP的上电引导方法，最后通过USB2.0总线接将经过DSP处理的数上传到PC机。基于DSP的便携式数据采集系统软件设计，主要包括固件程序、USB系统驱动程序和应用程序3部分，而USB系统驱动程序又分为USB客户驱动程序、USB驱动程序(USED)和USB主控制器驱动程序(HCD)。对于硬件部分的功能模块，要求每个功能模块应有对应的驱动子程序。主机应用程序根据软件部分要实现的功能进行划分实现了系统与上位机的通讯功能。更多还原

【Abstract】 As one kind of tignum, concrete is widely used in infrastructure construction in our country. The research of the concrete crack resistance is urgent need, which was due to the common existing of concrete structure crack. Deep research of the concrete crack resistance can get the quantitative evaluation of the concrete crack resistance performance; provide accurate instruction for the design of concrete construction and reliable basis for raw material selection with the mixture ratio.This dissertation is a separation problem of temperature & humidity control system in temperature-stress testing machine. Based on the investigation and study, key questions of current portable data acquisition system are analyzed. Combining with main function of target system, technology of USB with protocol in version 2.0 is adopted as interface bus of data acquisition system, the system structure and software framework are designed. Hardware and software design of portable data acquisition system based on DSP are completed. The detail of dissertation reads as follows.Hardware design of portable data acquisition system based on DSP is the focal point in dissertation, which is composed of three sections, data acquisition module, digital signal processing module and USB interface module. The isolation, amplification and acquisition of analog signals are completed in data acquisition module; 16-channal analog signals are sampled by four pieces of Analog-to-Digital Converter then transmitted to data bus in data acquisition card. Memory expansion and electrify bootstrap of DSP, serial interface communication with PC are completed in digital signal processing module, finally, processed data are transmitted to PC with USB.Three sections of Firmware program, USB system drive and application program are included in software design of portable data acquisition system based on DSP. In addition, USB system drive is separated into USB client drive, USB equipment drive and USB host control drive. There are corresponding subroutine drives in hardware functional module. According to software functional partitioning realized data communication with upper machine in USB host application program.更多还原