油罐控制节点的电路研究与设计

发布时间：2018-06-09 05:22

本文选题：油罐 + 控制节点　；参考：《山东大学》2015年硕士论文

【摘要】：近年来,油罐液位自动计量系统已逐步取代传统的人工机械检尺方式,数据处理方式已经由原来的单点采集、网络传输、集中处理的方式向单点采集、单点处理、网络监控的方式转变。通过市场调查和研究论证,现阶段,国内使用的油罐控制节点大多为国外进口或半进口仪表,存在仪表计量方法与国内统计方法不配套、维修成本高、升级改造难度大等问题。国内产品数据处理速度慢,测量精度低,抗干扰能力差等问题,特别是在信号分析处理计算精度和速度上较之国外先进技术水平还有一定差距。因此,研究发展先进油罐控制节点电路,对提升油罐自动计量系统整体性能意义重大。本文研究重点是油罐控制节点电路设计,采用小波阈值分析与希尔伯特黄变换分析相结合的滤波方法,通过Simulink模块化设计,使用MATLAB仿真,进而基于FPGA实现硬件电路设计和仿真验证。本文主要内容如下：(1)分析了上述两种算法基本原理及流程,深入的研究了传统EMD分解端点效应的处理方法和希尔伯特变换谱分析方法。(2)论证了小波阈值滤波与改进后的希尔伯特黄变换滤波相结合处理超声波液位传感器信号可行性。(3)结合改进后的算法流程编写软件代码,对模拟波形进行分析处理,验证两种算法相结合的可行性；(4)用MATLAB自带的Simulink库建立相关算法模型,进行模块化仿真。(5)使用DSPBuilder MATLAB语言转变为VHDL文件,进而编译综合,完成目标器件配置,将VHDL文件下载到FPGA内,然后进行硬件程序测试和实现验证。本文创新之处在于：(1)将最近相似波形端点延拓法用于处理超声波液位传感信号的分析处理。(2)采用二维灰度希尔伯特谱滤波法分析处理油罐超声波液位传感信号,提高信号后期处理效果和精度。(3)将小波阈值分析与希尔伯特黄变换相结合的滤波方法,运用到超声波液位传感器非线性非平稳信号的分析处理,实现了液位控制节点电路的基本功能,计算精确度有了一定的提升,为下一步设计制作新型超声波液位计提供了重要支撑,具有重要的研究价值与应用价值。
[Abstract]:In recent years, the oil tank liquid level automatic metering system has gradually replaced the traditional manual mechanical ruler way, the data processing way has already changed from the original single point collection, the network transmission, the centralized processing way to the single point collection, the single point processing. The mode of network monitoring is changing. Through market investigation and research and demonstration, at present, most of the control nodes of oil tank used in China are imported or semi-imported instruments, there are some problems such as the metering method is not matched with the domestic statistical method, the maintenance cost is high, and the upgrading and transformation is difficult, and so on. The domestic product data processing speed is slow, the measurement precision is low, the anti-jamming ability is poor, especially in the signal analysis processing calculation precision and the speed still has the certain disparity compared with the foreign advanced technology level. Therefore, the research and development of advanced tank control node circuit is of great significance to improve the overall performance of oil tank automatic metering system. This paper focuses on the design of the control node circuit of the oil tank. The filtering method combining wavelet threshold analysis and Hilbert yellow transform analysis is adopted. Through the Simulink modularization design, MATLAB simulation is used. Then the hardware circuit design and simulation based on FPGA are realized. The main contents of this paper are as follows: (1) the basic principles and flow chart of the above two algorithms are analyzed. In this paper, the traditional EMD decomposition endpoint effect processing method and Hilbert transform spectrum analysis method. 2) prove that wavelet threshold filter and improved Hilbert Huang transform filter are combined to deal with ultrasonic liquid level sensor information. Combining with the improved algorithm flow to write the software code, The simulation waveform is analyzed and processed to verify the feasibility of combining the two algorithms. The Simulink library of MATLAB is used to build the relevant algorithm model, and the modularized simulation. 5) using DSP Builder MATLAB language to convert the VHDL file into VHDL file, and then compiling and synthesizing. Complete the target device configuration, download the VHDL file to FPGA, then test and verify the hardware program. The innovation of this paper is that: (1) the most recent similar waveform endpoint continuation method is applied to the analysis and processing of ultrasonic liquid level sensing signal. (2) the two-dimensional gray level Hilbert spectrum filtering method is used to analyze and process the ultrasonic liquid level sensing signal of oil tank. The filtering method combining wavelet threshold analysis with Hilbert-Huang transform is applied to the analysis and processing of nonlinear non-stationary signals of ultrasonic liquid level sensor. The basic function of the circuit of liquid level control node has been realized, and the calculation accuracy has been improved to a certain extent, which provides an important support for the design and manufacture of a new type of ultrasonic liquid level meter, which has important research value and application value.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE972

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