微波气固两相流测量

发布时间：2018-01-06 00:25

本文关键词：微波气固两相流测量　出处：《北方工业大学》2015年硕士论文　论文类型：学位论文

更多相关文章： 多普勒信号 固体流量检测 DSP FFT

【摘要】：在当今工业快速发展的进程中,固体质量流量的准确测量在众多生产领域中的重要性日趋凸显,尤其在冶金及化工生产中,固体质量流量的检测对企业成本控制、能源节约等都有现实意义。应用微波技术检测气固两相流中固体流量是一项新技术,该方法属于非接触式测量,具有结构紧凑、便于安装与维护、响应速度快等优点,具有很好的应用前景。本文以多普勒原理为理论基础设计了气固两相流测量系统。系统由三部分组成：微波雷达、DSP以及上位机,其中重点对信号的处理方法进行了研究,并分别编写了DSP及上位机部分的程序。主要工作如下：首先,基于TMS320F2812丰富的片上资源以及其强大的数字信号处理能力,系统中信号采集及数据处理等功能都在DSP上实现。DSP以设定的采样频率对多普勒雷达的输出信号进行采集和校正,然后通过对比几种数字滤波算法选用合适的算法来对信号进行滤波,最后使用快速傅里叶变换来对信号进行频域分析,提取出信号的频率及功率谱。物料的速度依据多普勒原理通过对信号的频率进行计算获得。系统上位机使用C++builder进行编写,主要实现与下位机DSP之间的通信,可以对DSP发送指令和进行参数设置并且从DSP读取数据。对功率谱密度——质量流量进行测量标定,使用拟合算法得到物料的流量与功率谱之间的关系式,通过此关系式可以由测得的功率谱密度计算得到相对应的质量流量。本文中上位机与DSP之间的通信通过USB芯片CY7C68013来完成。最后,使用本系统对黄豆分别进行了速度及流量的测量实验,分析结果及误差。
[Abstract]:With the rapid development of industry, the accurate measurement of solid mass flow is becoming more and more important in many fields of production, especially in metallurgical and chemical production. The detection of solid mass flow is of practical significance to enterprise cost control, energy saving and so on. It is a new technology to use microwave technology to detect solid flow in gas-solid two-phase flow, and this method belongs to non-contact measurement. It has many advantages, such as compact structure, easy installation and maintenance, fast response and so on. Based on the Doppler principle, a gas-solid two-phase flow measurement system is designed in this paper. The system is composed of three parts: microwave radar DSP and upper computer, in which the signal processing method is studied. The programs of DSP and PC are written respectively. The main work is as follows: First of all, based on the rich on-chip resources of TMS320F2812 and its powerful digital signal processing ability. The functions of signal acquisition and data processing in the system are implemented on DSP to collect and correct the output signal of Doppler radar with the set sampling frequency. Then by comparing several digital filtering algorithms to select the appropriate algorithm to filter the signal. Finally, the fast Fourier transform is used to analyze the signal in frequency domain. The frequency and power spectrum of the signal are extracted and the velocity of the material is obtained by calculating the frequency of the signal according to the Doppler principle. The upper computer of the system is written with C builder, which mainly realizes the communication with the lower computer DSP. The DSP can be sent instructions and parameters set and the data can be read from the DSP.; the power spectral density-mass flow can be measured and calibrated. The relationship between flow rate and power spectrum is obtained by fitting algorithm. The corresponding mass flow can be calculated from the measured power spectral density. In this paper, the communication between host computer and DSP is accomplished by USB chip CY7C68013. Finally, the system was used to measure the velocity and flow rate of soybean, the results and errors were analyzed.
【学位授予单位】：北方工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TH814

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