【作者】 郑超；

【导师】 王雪梅；

【作者基本信息】 西南交通大学 ， 测试计量技术及仪器， 2010， 硕士

【摘要】 随着我国铁路高速重载战略的实施,铁路运输速度和能力稳步提升,铁道机车车辆在肩负着新的历史责任和任务的同时也面临着更加严峻的行车安全考验。机车车辆零部件性能的稳定是列车安全运行的重要保证,这些零部件在长期运营的情况下极易出现不同程度的损伤,对铁路安全运输构成威胁,严重时甚至引起重大的行车事故。因此,采用先进的检测技术和仪器对机车车辆在役零部件进行及时的检修,对于保证行车安全和铁路发展战略的加速实施具有重要的现实意义。论文针对目前铁道机车车辆超声检测领域模拟式检测系统的问题与不足,提出了一套以FPGA和DSP为核心的数字式超声检测系统方案,实现了高频率、低幅值的超声模拟信号的采集、处理、存储和传输。论文完成了检测系统的硬件电路设计工作。系统选用高速宽带放大器AD8099和AD603对超声回波信号进行了调理,并采用采样频率达40MHz的8位高速模数转换器TLC5540对调理后的信号进行采样量化；系统以FPGA器件EP1C3T144C8和DSP器件TMS320F2812为控制模块核心,解决了超声回波高速数据流的处理问题；此外,系统采用USB控制器CY7C68013作为与上位机通讯的接口完成采集数据的传输。论文在FPGA开发软件QuartusⅡ中完成了系统逻辑控制和数据缓存等功能模块的设计和仿真,验证了软件设计的有效性；系统采用C语言在DSP集成开发环境CCS中完成了系统的采集控制软件开发工作；另外,系统在Keil环境下进行了USB固件程序的编写与调试。论文在完成系统软硬件设计的基础上,在车辆实验室对所设计的数字式超声检测系统进行了功能测试。测试结果证明,该检测系统能够满足超声检测所需的高速数据采集、处理和传输的要求,提高了超声检测系统的自动化和智能化的程度,对于完善和发展超声检测具有很强的理论意义和现实意义。更多还原

【Abstract】 With the implementation of high-speed and overload strategy,the national transportation speed and capability have increased steadyly,and the railway locomotives vehicles are undertaking new responsibility and mission,and at the same time facing a more severe test of driving safty.The stability of Locomotive vehicle key parts is an important guarantee for the safe operation of train,however,these components will suffer various damage in different degree, or cause a series of serious traffic accident under the condition of long-term operation, which has been a great threaten to the transportation.Therefore,a timely maintenance for the in-sever vehicle parts with the use of advanced detection technology and equipment is of important practical significance to the assurance of driving safty and development strategy implemention.Aiming at the disadvantages and shortcomings of analog ultrasonic inspection equipment currently used in the railway locomotives and car field, a digital ultrasonic inspection system based on FPGA and DSP was put forword,which enable the acqusition,processing, storage and transmission of high-frequency,low amplitude ultrasonic analog signal.The hardware circuit of the digital inspection system was designed.High speed,wide bandwidth devices AD8099 and AD603 were adopted as the system amplifier,and a 8bit analog-to-digital conventor TLC5540 was used as the system ADC,whose sampling rate is up to 40MHz. Besides,the problem of high speed data flow processing was well solved,using FPGA device EP1C3T144C8 and DSP device TMS320F2812 as the core of system control module; in addition,the system choosed USB controllor device CY7C68013 as the communication interface between system and the host computer.The paper designed the FPGA software,such as the function module of logic control and data cache, as well as simulated to verify the effectiveness in QuartusⅡ;besides,the system acqusition and control software development is finished in CCS based on C language;at last, the USB firmware was finished in Keil enviroment.The digital ultrasonic inspection system was tested in the vehicle laboratory on the basis of hardware and software completion.The result showed that the system can meet the needs of the high-speed data acquisition, processing and transmission of ultrasonic signal,and made a great improvement in the aspects of automation and intelligent,being of great significance for the ultrasonic inspection development both in practice and theory.更多还原