【作者】 刘业颜；

【导师】 郑文；

【作者基本信息】 广州大学 ， 机械设计及理论， 2010， 硕士

【摘要】 炼钢过程中,连铸生产技术正逐渐向高效发展,这就要求连铸设备必须具有更高的工作效率、更高的工作强度。研究表明结晶器振动装置是连铸设备实现高效率、高精度、稳定工作的关键设备,其工作过程中所产生的超低频振动直接影响连铸生产的质量、产量和安全。因此,对结晶器振动装置进行振动状态监测和分析,已经成为连铸技术的研究热点之一。超低频信号具有频率低、噪声多、测试时间长等特点,其测量与分析在工程测量领域上仍然是一个难题。到目前为止,针对结晶器振动装置超低频振动的在线检测系统很少且测量精度较低。本文根据国内外相关研究现状和发展趋势,分析了结晶器振动装置的振动特性,研究和开发了相应的超低频振动分析系统。本论文详细介绍系统的总体方案、硬件设计、软件设计和测试方法。以电容式加速度传感器、信号调理模块、USB数据采集卡模块为硬件基础,在Labview虚拟仪器平台上开发了软件系统。系统结构主要分为采集设置模块、信号采集模块、信号分析模块、数据储存模块以及数据查询模块。根据结晶器振动装置超低频信号的特点,本论文采用了经典和现代信号处理技术,对信号的特征进行分析与处理,并结合多种形式的图形显示。在系统软件中采取有效的积分方法,减小AVD(加速度、速度、位移)之间的计算误差;借助Labview提供的功能节点以及MATLAB软件接口,利用MATLAB信号处理函数,提高了系统的信号处理能力。此外,研究了系统的测试方法,通过标准数字信号发生器和专门设计的振动台对系统特性进行了较完整的测试,并和美国ENTEK公司的XM-121低频系统进行了对比。研究结果表明,本系统的各个模块功能已达到预期目标,具有测量精度高、扩展性高、界面友好、低频测量范围大等特点,能实现多通道同步测量,完全满足结晶器振动装置超低频信号分析的要求。更多还原

【Abstract】 The continuous casting production has developed towards high-efficient technology during steel-making, which requires the continuous casting equipment with higher efficiency and strength to work. The research shows that the mould oscillation device is the key to achieve efficient, accurate and stable production. The ultra-low frequency vibration, which produces during working, affects directly the quality, yield and safety of the continuous casting production. Therefore, many researches have focused on the monitoring and analyzing of the ultra-low frequency vibration of the mould oscillation device in the continuous casting technology.The ultra-low frequency signal has the features of low frequency, much noise, long measurement time and so on. It is still difficult to analyze it accurately in the field of engineering measurement. Now there are few systems for the online detection of the ultra-low frequency vibration of the mould oscillation device, and the measuring accuracy is low. This thesis analyzed the vibration characteristics of the mould oscillation device, and studied and developed the measuring system of ultra-low frequency vibration, based on the understanding of the development status and trend in this field.The thesis introduces in details the overall scheme, the hardware design, the software design and the testing method of the system. The capacitive acceleration sensor, the signal conditioning module and the USB data acquisition module are used as the hardware foundation, and the software was developed based on the Labview virtual instrument platform. The system is consisted of the acquisition setting, the signal analysis, the data storage and the data query modules. Considering the signal characteristics of the mould oscillation device, the classical and modern signal processing technologies are used,and combined with various form of graphics. The effective integration method has been developed to reduce the calculation error between AVD (acceleration, velocity, and displacement). The system signal processing ability has been improved by the use of the signal processing functions of MATLAB through the node provided by Labveiw and the software interface of MATLAB. In addition, the testing methods of the system have been studied. The system capability has tested through the standard digital signal generator and the special designed vibration table, and has compared with the XM-121 low frequency measuring system from ENTEK-USA.The research result has indicated that the functions of the modules of the system achieved the desired goal. This system has the features of high measuring accuracy, high expansibility, friendly interface, large range for low-frequency measurement, and so on. It has realized the multi-channel synchronous measurement, and satisfies entirely the requirement for the analysis of the ultra-low frequency signal of the mould oscillation device.更多还原