本文關(guān)鍵詞： 成像 兩相流 氣力輸送 顆粒物料 測(cè)量　出處：《化工學(xué)報(bào)》2014年10期 　論文類型：期刊論文

【摘要】：在雙截面電容層析成像(ECT)系統(tǒng)測(cè)量氣力輸送過程中栓塞流速度的應(yīng)用中,利用動(dòng)力學(xué)相關(guān)因子指數(shù)檢測(cè)電容信號(hào)的均值突變,根據(jù)突變點(diǎn)設(shè)置時(shí)間窗以提取上下游信號(hào),將所選信號(hào)映射成二值圖像,并進(jìn)行數(shù)學(xué)形態(tài)學(xué)閉運(yùn)算處理,對(duì)處理后的圖像進(jìn)行二維互相關(guān)計(jì)算,估算出栓塞流速度。實(shí)驗(yàn)結(jié)果表明了該方法的有效性,和傳統(tǒng)互相關(guān)法相比,改進(jìn)互相關(guān)法可有效提取有明顯波動(dòng)特征的信號(hào)段,并通過二維圖像互相關(guān)計(jì)算提高了互相關(guān)法的穩(wěn)定性,從而提高了ECT技術(shù)在線測(cè)量?jī)上嗔鞯臏?zhǔn)確性。
[Abstract]:In the application of dual section capacitance tomography (ECT) system to measure the velocity of embolic flow in pneumatic conveying process, the change of mean value of capacitance signal is detected by dynamic correlation factor index, and the upstream and downstream signals are extracted by setting a time window according to the abrupt point. The selected signals are mapped into binary images and processed by mathematical morphology closed operation. The two dimensional cross correlation calculation is carried out on the processed images, and the velocity of embolization flow is estimated. The experimental results show that the proposed method is effective. Compared with the traditional cross-correlation method, the improved cross-correlation method can effectively extract the signal segments with obvious fluctuation characteristics, and improve the stability of the cross-correlation method through two-dimensional image cross-correlation calculation, thus improving the accuracy of on-line measurement of two-phase flow using ECT technology.
【作者單位】： 中國(guó)民航大學(xué)航空自動(dòng)化學(xué)院;天津大學(xué)電氣與自動(dòng)化工程學(xué)院;
【分類號(hào)】：TK39

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本文編號(hào)：1510523