發(fā)布時(shí)間：2018-06-09 05:22

  本文選題：油罐 + 控制節(jié)點(diǎn)��； 參考：《山東大學(xué)》2015年碩士論文

【摘要】：近年來,油罐液位自動(dòng)計(jì)量系統(tǒng)已逐步取代傳統(tǒng)的人工機(jī)械檢尺方式,數(shù)據(jù)處理方式已經(jīng)由原來的單點(diǎn)采集、網(wǎng)絡(luò)傳輸、集中處理的方式向單點(diǎn)采集、單點(diǎn)處理、網(wǎng)絡(luò)監(jiān)控的方式轉(zhuǎn)變。通過市場(chǎng)調(diào)查和研究論證,現(xiàn)階段,國(guó)內(nèi)使用的油罐控制節(jié)點(diǎn)大多為國(guó)外進(jìn)口或半進(jìn)口儀表,存在儀表計(jì)量方法與國(guó)內(nèi)統(tǒng)計(jì)方法不配套、維修成本高、升級(jí)改造難度大等問題。國(guó)內(nèi)產(chǎn)品數(shù)據(jù)處理速度慢,測(cè)量精度低,抗干擾能力差等問題,特別是在信號(hào)分析處理計(jì)算精度和速度上較之國(guó)外先進(jìn)技術(shù)水平還有一定差距。因此,研究發(fā)展先進(jìn)油罐控制節(jié)點(diǎn)電路,對(duì)提升油罐自動(dòng)計(jì)量系統(tǒng)整體性能意義重大。本文研究重點(diǎn)是油罐控制節(jié)點(diǎn)電路設(shè)計(jì),采用小波閾值分析與希爾伯特黃變換分析相結(jié)合的濾波方法,通過Simulink模塊化設(shè)計(jì),使用MATLAB仿真,進(jìn)而基于FPGA實(shí)現(xiàn)硬件電路設(shè)計(jì)和仿真驗(yàn)證。本文主要內(nèi)容如下：(1)分析了上述兩種算法基本原理及流程,深入的研究了傳統(tǒng)EMD分解端點(diǎn)效應(yīng)的處理方法和希爾伯特變換譜分析方法。(2)論證了小波閾值濾波與改進(jìn)后的希爾伯特黃變換濾波相結(jié)合處理超聲波液位傳感器信號(hào)可行性。(3)結(jié)合改進(jìn)后的算法流程編寫軟件代碼,對(duì)模擬波形進(jìn)行分析處理,驗(yàn)證兩種算法相結(jié)合的可行性；(4)用MATLAB自帶的Simulink庫(kù)建立相關(guān)算法模型,進(jìn)行模塊化仿真。(5)使用DSPBuilder MATLAB語言轉(zhuǎn)變?yōu)閂HDL文件,進(jìn)而編譯綜合,完成目標(biāo)器件配置,將VHDL文件下載到FPGA內(nèi),然后進(jìn)行硬件程序測(cè)試和實(shí)現(xiàn)驗(yàn)證。本文創(chuàng)新之處在于：(1)將最近相似波形端點(diǎn)延拓法用于處理超聲波液位傳感信號(hào)的分析處理。(2)采用二維灰度希爾伯特譜濾波法分析處理油罐超聲波液位傳感信號(hào),提高信號(hào)后期處理效果和精度。(3)將小波閾值分析與希爾伯特黃變換相結(jié)合的濾波方法,運(yùn)用到超聲波液位傳感器非線性非平穩(wěn)信號(hào)的分析處理,實(shí)現(xiàn)了液位控制節(jié)點(diǎn)電路的基本功能,計(jì)算精確度有了一定的提升,為下一步設(shè)計(jì)制作新型超聲波液位計(jì)提供了重要支撐,具有重要的研究?jī)r(jià)值與應(yīng)用價(jià)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.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TE972

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本文編號(hào)：1999129