本文選題：物料狀態(tài) + EDEM�。� 參考：《湖南大學(xué)》2016年碩士論文

【摘要】：顆粒物料在自然界和工程應(yīng)用領(lǐng)域中極為普遍,休止角(repose angle)是顆粒物料的一種重要物理屬性,是表征轉(zhuǎn)筒類過程裝備內(nèi)物料狀態(tài)的重要特征量。國內(nèi)外學(xué)者對休止角進(jìn)行了很多實(shí)驗(yàn)研究,但在目前的研究成果中,實(shí)驗(yàn)對象大部分為球形顆粒,而實(shí)際工業(yè)生產(chǎn)中的物料形狀主要為不規(guī)則顆粒,球形顆粒的運(yùn)動(dòng)規(guī)律是否能夠反映非球形顆粒的運(yùn)動(dòng)還有待于驗(yàn)證。此外,實(shí)驗(yàn)轉(zhuǎn)筒的尺寸普遍偏小,與實(shí)際生產(chǎn)所應(yīng)用的轉(zhuǎn)筒尺寸有較大差別,是否能將小轉(zhuǎn)筒所得到結(jié)果上推到工業(yè)尺度回轉(zhuǎn)筒裝備中還需要進(jìn)一步研究。針對以上問題,本文根據(jù)實(shí)驗(yàn)室回轉(zhuǎn)筒設(shè)備以及圓柱體顆粒物料的實(shí)際尺寸,對不同轉(zhuǎn)速下(2.87rpm-17.23rpm)的顆粒物料運(yùn)動(dòng)過程進(jìn)行DEM建模和仿真,在EDEMTM環(huán)境下完成了各模塊的參數(shù)設(shè)定。搭建了相應(yīng)的回轉(zhuǎn)筒實(shí)驗(yàn)平臺,來模擬轉(zhuǎn)筒型過程裝備中圓柱體顆粒物料的運(yùn)動(dòng)狀態(tài),通過圖像采集裝置獲得物料運(yùn)動(dòng)的圖像信息。給出了基于圖像處理技術(shù)的顆粒物料動(dòng)態(tài)休止角的檢測算法,并基于以上算法對物料狀態(tài)圖像進(jìn)行檢測,獲得不同操作參數(shù)下的顆粒物料休止角仿真實(shí)驗(yàn)曲線以及物理實(shí)驗(yàn)曲線。通過對物料狀態(tài)圖像、休止角動(dòng)態(tài)變化曲線的對比,驗(yàn)證了DEM仿真結(jié)果的正確性�；谒⒌木_DEM模型,對工業(yè)尺度回轉(zhuǎn)筒內(nèi)的顆粒系統(tǒng)進(jìn)行了不同實(shí)驗(yàn)條件下的仿真實(shí)驗(yàn)。研究發(fā)現(xiàn),轉(zhuǎn)筒直徑不變時(shí),休止角隨著轉(zhuǎn)速的增加,由30.27±1.50度增長34.03±0.32度,有明顯的上升趨勢；轉(zhuǎn)速不變時(shí),隨著轉(zhuǎn)筒直徑的增加休止角由37.23±2.49度下降到28.64±0.49度,有明顯的下降趨勢。該結(jié)論與其他人員在小轉(zhuǎn)筒內(nèi)所得結(jié)論一致,證明在小轉(zhuǎn)筒內(nèi)所得的休止角規(guī)律可以上推至一定范圍內(nèi)的工業(yè)尺度轉(zhuǎn)筒中。
[Abstract]:Granular materials are very common in nature and engineering applications. Repose angle is an important physical property of granular materials and an important characteristic quantity to characterize the material state in rotary process equipment. Scholars at home and abroad have done a lot of experimental research on the angle of repose, but in the current research results, most of the experimental objects are spherical particles, while the material shape in actual industrial production is mainly irregular particles. Whether the movement law of spherical particles can reflect the movement of non-spherical particles remains to be verified. In addition, the size of the experimental rotary drum is generally small, which is different from that of the actual production. Whether the results of the small rotary drum can be pushed to the industrial scale rotary equipment should be further studied. In order to solve the above problems, according to the actual size of the rotary cylinder equipment and the cylinder particle material, this paper models and simulates the particle material movement process of 2.87rpm-17.23rpm at different rotational speeds by DEM, and completes the parameter setting of each module under the EDEMTM environment. A rotating cylinder experimental platform was built to simulate the motion state of the cylindrical particle material in the rotary process equipment, and the image information of the material movement was obtained by the image acquisition device. An algorithm for detecting dynamic angle of repose of granular material based on image processing technology is presented, and the image of material status is detected based on the above algorithm. The simulated experimental curves and physical experimental curves of the angle of repose of granular materials under different operating parameters were obtained. The correctness of DEM simulation results is verified by comparing the dynamic curve of material state image and angle of repose. Based on the established precise DEM model, the simulation experiments of the particle system in the industrial scale rotary cylinder are carried out under different experimental conditions. It is found that the angle of repose increases obviously from 30.27 鹵1.50 degrees to 34.03 鹵0.32 degrees with the increase of rotating speed, and decreases from 37.23 鹵2.49 degrees to 28.64 鹵0.49 degrees with the increase of rotating speed. The conclusion is in agreement with the conclusion obtained by other people in the small drum. It is proved that the law of the angle of repose obtained in the small drum can be pushed up to a certain extent in the industrial scale cylinder.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TB383;TP391.41

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