本文選題：數(shù)值模擬　切入點(diǎn)：石英壓電傳感器　出處：《北京交通大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：中國白酒的種類繁多,風(fēng)格各異。其微量香味物質(zhì)的成分含量及相互之間的配比關(guān)系,是決定白酒香味風(fēng)格的關(guān)鍵因素。由于微量香味物質(zhì)的復(fù)雜性和相似性,準(zhǔn)確的識(shí)別不同香味風(fēng)格的中國白酒非常困難。聚合物石英壓電傳感器電子鼻是近年來基于石英壓電微天平(QCM)原理研發(fā)的一種中國白酒檢測(cè)設(shè)備,其結(jié)構(gòu)主要包括兩大系統(tǒng):以8個(gè)聚合物石英壓電傳感器組成陣列為核心的氣體信息采集系統(tǒng)和基于特定模式識(shí)別算法的模式識(shí)別系統(tǒng)。由于各個(gè)涂層吸附性之間的差異,當(dāng)傳感器陣列與中國白酒揮發(fā)氣體接觸時(shí),各個(gè)傳感器因吸附程度不同導(dǎo)致對(duì)應(yīng)檢測(cè)頻率信號(hào)的差異性輸出,并且各個(gè)檢測(cè)頻率信號(hào)的值均呈現(xiàn)"先減小,再穩(wěn)定"的變化趨勢(shì)。模式識(shí)別系統(tǒng)對(duì)各個(gè)檢測(cè)頻率信號(hào)穩(wěn)定階段的值進(jìn)行分析、描述、判斷、識(shí)別,即可實(shí)現(xiàn)電子鼻對(duì)中國白酒的檢測(cè)與識(shí)別。為了保證聚合物石英壓電傳感器電子鼻穩(wěn)定的、可靠的識(shí)別中國白酒,以前電子鼻優(yōu)化設(shè)計(jì)方案更多關(guān)注其識(shí)別系統(tǒng)的改進(jìn)。但由于電子鼻檢測(cè)方式特殊,并適合在各類場(chǎng)合下使用,某些物理環(huán)境因素(如磁場(chǎng)、氣動(dòng)力)對(duì)其內(nèi)部各個(gè)聚合物石英壓電傳感器檢測(cè)頻率信號(hào)的影響不可避免。針對(duì)物理環(huán)境因素對(duì)傳感器檢測(cè)頻率信號(hào)的影響,以前的研究沒有給予充分的考慮和評(píng)估。因此,在本文中,我們以數(shù)值模擬為主要研究手段,分別分析了磁場(chǎng)和氣動(dòng)力對(duì)聚合物石英壓電傳感器檢測(cè)頻率值的影響,具體研究?jī)?nèi)容如下:1)研究了均勻、穩(wěn)定的靜磁場(chǎng)對(duì)聚合物石英壓電傳感器檢測(cè)頻率信號(hào)的影響�；诠�(jié)約計(jì)算成本、減少計(jì)算時(shí)間的原則,通過ANSYS/Multiphysics程序化語言設(shè)計(jì),給出了一個(gè)包含電磁分析和壓電預(yù)應(yīng)力模態(tài)分析的單向間接耦合分析過程,預(yù)測(cè)了均勻穩(wěn)定靜磁場(chǎng)下,聚合物石英壓電傳感器上的電磁力分布特征、應(yīng)力分布特征和檢測(cè)頻率信號(hào)變化。2)為了研究氣動(dòng)力對(duì)聚合物石英壓電傳感器的影響,首先通過基于有限體積法的CFD模擬,盡大限度的還原了中國白酒揮發(fā)氣體在真實(shí)檢測(cè)場(chǎng)景中的流動(dòng)。然后,從時(shí)間和概率密度分布的角度,展示了氣動(dòng)力作用在聚合物石英壓電傳感器軸線方向(如圖2-2)的合力(Fy)。最后,為了保證電子鼻穩(wěn)定檢測(cè)中國白酒,通過對(duì)比了 Fy的方差與傳感器檢測(cè)頻率信號(hào)值在穩(wěn)定階段的方差,估計(jì)氣動(dòng)力對(duì)聚合物石英壓電傳感器對(duì)傳感器檢測(cè)頻率信號(hào)值的影響。本文給出的模擬方法和得到的結(jié)論可為我們未來優(yōu)化設(shè)計(jì)聚合物石英壓電傳感器電子鼻,提供理論依據(jù)及技術(shù)指導(dǎo)。
[Abstract]:There are many kinds of liquor in China and its style is different. The content of trace aroma substances and their proportion are the key factors to determine the flavor style of liquor, because of the complexity and similarity of trace aroma substances. It is very difficult to accurately identify Chinese liquor with different flavor styles. Polymer quartz piezoelectric sensor electronic nose is a kind of Chinese liquor detection equipment developed in recent years based on the principle of quartz piezoelectric microbalance (QCM). The structure consists of two main systems: a gas information acquisition system based on an array of eight polymer quartz piezoelectric sensors and a pattern recognition system based on a specific pattern recognition algorithm. When the sensor array is in contact with the volatile gas of Chinese liquor, the difference of the corresponding detection frequency signal is caused by the different adsorption degree of each sensor, and the value of each detection frequency signal is reduced first. The pattern recognition system analyzes, describes, judges and recognizes the values of each stable phase of the detected frequency signal. It can realize the detection and recognition of Chinese liquor by electronic nose. In order to ensure the stability and reliability of electronic nose of polymer quartz piezoelectric sensor, In the past, more attention was paid to the improvement of electronic nose identification system. However, due to the special detection method of electronic nose and suitable for use in various situations, some physical environmental factors (such as magnetic field, magnetic field, etc.). The influence of aerodynamic force on the detection frequency signal of each polymer quartz piezoelectric sensor is inevitable. The previous research has not given sufficient consideration and evaluation to the influence of the physical environment on the frequency signal of the sensor. In this paper, we analyze the influence of magnetic field and aerodynamic force on the detection frequency of polymer quartz piezoelectric sensor by numerical simulation. The influence of stable static magnetic field on the frequency signal of polymer quartz piezoelectric sensor. Based on the principle of saving calculation cost and reducing calculation time, the method is designed by ANSYS/Multiphysics programming language. A unidirectional and indirect coupling analysis process including electromagnetic analysis and piezoelectric prestressing mode analysis is presented, and the electromagnetic force distribution characteristics of polymer quartz piezoelectric sensor under uniform and stable static magnetic field are predicted. In order to study the effect of aerodynamic force on polymer quartz piezoelectric sensor, the CFD simulation based on finite volume method is carried out. The flow of volatile gas in Chinese liquor is reduced to the maximum extent in the real detection scene. Then, from the angle of time and probability density distribution, The resultant force of aerodynamic force in the axis of polymer quartz piezoelectric sensor (Fig. 2-2) is demonstrated. Finally, in order to ensure the stability of the electronic nose for the detection of Chinese liquor, By comparing the variance of Fy with the variance of the frequency signal of the sensor at the stable stage, The influence of aerodynamic force on the detection frequency signal of polymer quartz piezoelectric sensor is estimated. The simulation method and the conclusion obtained in this paper can be used to optimize the design of polymer quartz piezoelectric sensor electronic nose in the future. To provide theoretical basis and technical guidance.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TP212

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本文編號(hào)：1645669