本文關(guān)鍵詞： 超聲波 粒度 濃度 衰減理論 線性疊加　出處：《燕山大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：超聲法測(cè)量顆粒粒度與其他顆粒測(cè)量技術(shù)相比具有測(cè)量范圍廣、適合高濃度測(cè)量、能夠?qū)崿F(xiàn)在線測(cè)量等優(yōu)點(diǎn)。在選礦作業(yè)中利用超聲波測(cè)粒儀能夠同時(shí)實(shí)現(xiàn)濃度和粒度的在線檢測(cè),提高選礦質(zhì)量,降低生產(chǎn)成本。然而國(guó)內(nèi)超聲測(cè)粒技術(shù)的發(fā)展比較落后,測(cè)量顆粒粒度的精確性、可測(cè)量顆粒濃度范圍和超聲衰減理論模型的適用性等方面都存在一定的局限性。針對(duì)以上問題,本文基于對(duì)超聲波傳輸特性和衰減機(jī)理的深入探討,對(duì)比分析多種超聲波衰減理論模型的適用性;在對(duì)超聲波衰減規(guī)律進(jìn)行仿真分析的基礎(chǔ)上,提出多模型線性疊加理論;設(shè)計(jì)并搭建了超聲波檢測(cè)礦漿粒度和濃度的實(shí)驗(yàn)系統(tǒng),進(jìn)行相關(guān)實(shí)驗(yàn),得出了較好的實(shí)驗(yàn)結(jié)果。本文主要研究?jī)?nèi)容如下:(1)研究超聲波的物理特性和超聲波的傳播特性�；趯�(duì)超聲波的聲速、聲壓、聲強(qiáng)等特征量的探討,分析超聲波在固液兩相介質(zhì)面上的傳輸特性和超聲波在介質(zhì)中的波動(dòng)規(guī)律,在此基礎(chǔ)上深入研究超聲波在非均勻介質(zhì)中的衰減機(jī)理。(2)對(duì)比分析現(xiàn)有超聲波衰減理論模型的適用性,基于對(duì)模型參數(shù)和建立模型顆粒體系的研究,針對(duì)單一模型適用性較低問題,提出了多模型線性疊加理論;并且應(yīng)用Matlab軟件對(duì)超聲波頻率、顆粒體積濃度和介質(zhì)溫度對(duì)衰減量的影響規(guī)律進(jìn)行了仿真分析。(3)基于直接測(cè)量超聲波渡越時(shí)間的固液兩相流中聲速測(cè)量方法,構(gòu)建了超聲波檢測(cè)礦漿粒度和濃度的測(cè)量實(shí)驗(yàn)系統(tǒng),可以同時(shí)完成超聲波速度和衰減系數(shù)的測(cè)量。實(shí)驗(yàn)系統(tǒng)由超聲波發(fā)射和接收裝置,測(cè)量槽,數(shù)據(jù)采集、處理及測(cè)量系統(tǒng)軟件等部分構(gòu)成。(4)設(shè)計(jì)系統(tǒng)實(shí)驗(yàn),控制單一變量分別研究超聲波聲速和衰減量的變化規(guī)律,實(shí)驗(yàn)結(jié)果和理論分析相符;根據(jù)實(shí)驗(yàn)獲得的超聲波速度和衰減值數(shù)據(jù),采用非線性反演算法計(jì)算顆粒粒度大小,實(shí)驗(yàn)結(jié)果表明針對(duì)質(zhì)量濃度為10%~50%的石英石懸濁液,線性疊加模型和單一模型相比適用性更強(qiáng),測(cè)量精度更高。
[Abstract]:Compared with other ultrasonic measurement of particle size measurement technique has wide measuring range, suitable for high concentration measurement, can realize on-line measurement. In mineral processing by ultrasonic can realize online detection of concentration and size particle sizer, improve processing quality, reduce the production cost. However, the domestic development of ultrasonic particle detection technology comparison behind the accuracy of measuring the particle size, particle concentration measurement range and the theory of ultrasonic attenuation model applicability etc. there are some limitations. In view of the above problems, this paper discusses on the ultrasonic wave propagation and attenuation mechanism based on the applicability analysis of various theoretical model of ultrasonic attenuation of ultrasonic attenuation in contrast; the law is on the basis of simulation analysis, proposed model of linear superposition theory; design and build the ultrasonic detection of pulp particle size and concentration. Inspection system, related experiments, obtained good results. The main research contents of this paper are as follows: (1) the propagation characteristics of physical properties and ultrasonic study of ultrasonic. The sound pressure of ultrasonic velocity, based on acoustic intensity characteristics, transmission characteristics and Analysis on fluctuation of ultrasonic in the solid-liquid two-phase medium surface in the medium, further study on the mechanism of ultrasonic attenuation in inhomogeneous medium. (2) based on the analysis of applicability of the existing theoretical model of ultrasonic attenuation contrast research on model parameters and establish the model of particle system based on the applicability of the model for a single low problem, this paper presents a multiple model linear superposition theory application of Matlab software; and the effects of ultrasonic frequency, particle concentration and temperature on the attenuation was simulated and analyzed. (3) based on the direct measurement of ultrasonic transit time The solid-liquid two-phase flow velocity measurement method, constructs the measurement system of ultrasonic detection of pulp particle size and concentration can be measured at the same time, the ultrasonic velocity and attenuation coefficient. The experimental system is composed of ultrasonic transmitting and receiving device, measuring tank, data acquisition, processing and measuring system software parts. (4) design experiment changes of ultrasonic velocity and attenuation of a single variable control, consistent with the experimental results and theoretical analysis; according to the ultrasonic velocity and attenuation values obtained in the experiment data, calculate the particle size by the nonlinear inversion algorithm, the experimental results show that the mass concentration of 10%~50% quartz suspension, linear superposition model and single model compared to the more suitable and higher measurement accuracy.

【學(xué)位授予單位】：燕山大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TD925

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