發(fā)布時間：2019-02-25 14:10

【摘要】：樹脂錨固劑是一種廣泛應(yīng)用于隧道施工、建筑物加固、水電工程預(yù)應(yīng)力錨桿加固等領(lǐng)域的材料。然而大部分錨固劑依靠手工生產(chǎn)，導(dǎo)致生產(chǎn)效率低、勞動強度大且質(zhì)量不穩(wěn)定。目前自動化的樹脂錨固劑生產(chǎn)線正逐漸替代手工生產(chǎn)，但是也存在一些問題，例如在兩擠壓缸交替工作送料時，在銜接處會出現(xiàn)出料不連續(xù)問題，導(dǎo)致裝袋質(zhì)量不合格。造成該問題的根本原因是，兩擠壓缸在交替工作的銜接處出現(xiàn)壓力脈動，從而導(dǎo)致流量脈動。 針對該問題，本文首先研究了流體脈動抑制理論基礎(chǔ)，對流體脈動的機理、管路動態(tài)特性、濾波器濾波效果評價方法等做了深入研究，為濾波器結(jié)構(gòu)設(shè)計以及濾波特性分析奠定了基礎(chǔ)。 其次，研究了現(xiàn)有脈動抑制方法，詳細闡述了皮囊式濾波器、抗性濾波器和阻性濾波器等被動式濾波器的濾波原理。分析了各種被動式濾波器的優(yōu)缺點，并在此基礎(chǔ)上設(shè)計了一種新型的濾波器。該濾波器結(jié)合了皮囊式濾波器和H型濾波器的優(yōu)點，通過改變?yōu)V波器細長孔的數(shù)目、直徑和長度，，既能衰減窄頻的脈動波，又能對頻率范圍較寬的脈動波進行有效的衰減。 再次，本文引入了電液比擬的建模方法，詳細闡述了該方法的理論基礎(chǔ)。運用電液比擬的建模方法，對針對窄頻的濾波器進行了建模，并用MATLAB對濾波器各結(jié)構(gòu)參數(shù)對濾波效果的影響進行了仿真分析。研究表明，適當(dāng)增加濾波器的體積、減小細長孔的直徑，或者增加細長孔的長度都有利于脈動的衰減。研究還表明，流體粘度對濾波器最佳細長孔個數(shù)有一定的影響。 此外，根據(jù)樹脂錨固劑生產(chǎn)線流體脈動特點，設(shè)計了一種寬頻濾波器。文章還引入了功率鍵合圖建模方法，用該方法繪制出了系統(tǒng)功率鍵合圖，并且根據(jù)所繪制的功率鍵合圖推導(dǎo)出了系統(tǒng)數(shù)學(xué)模型。最后，運用MATLAB軟件仿真分析了濾波器的安裝位置和流體粘度對濾波器濾波效果的影響。結(jié)果表明，為了使濾波器濾波效果達到最佳，在安裝濾波器時，盡可能使濾波器靠近脈動源而遠離負載端。研究結(jié)果還表明，流體粘度會影響濾波器脈動衰減效果。即在某些低頻率范圍內(nèi)，流體粘度越小越有利于脈動的衰減；而在相對某些高頻范圍內(nèi)卻恰恰相反�？偟膩碚f，隨流體粘度增大，濾波器所能衰減脈動波的頻率范圍更廣。
[Abstract]:Resin anchoring agent is widely used in the field of tunnel construction, building reinforcement, prestressed anchor reinforcement of hydropower project and so on. However, most Anchorage agents rely on manual production, resulting in low production efficiency, high labor intensity and unstable quality. At present, the automatic resin anchoring agent production line is gradually replacing manual production, but there are also some problems, for example, when the two extruding cylinders work alternately, the discontinuity problem will appear in the joint, which leads to the unqualified packing quality. The root cause of the problem is that the pressure pulsation occurs at the joint of the two extruding cylinders, which leads to the flow pulsation. In order to solve this problem, the theoretical basis of fluid pulsation suppression is studied firstly, and the mechanism of fluid pulsation, the dynamic characteristics of pipeline, the evaluation method of filter filtering effect and so on are deeply studied. It lays a foundation for the design of filter structure and the analysis of filter characteristics. Secondly, the existing methods of pulse suppression are studied, and the filtering principles of passive filters, such as pouch filter, resistance filter and resistance filter, are described in detail. The advantages and disadvantages of various passive filters are analyzed and a new type of filters is designed. By changing the number, diameter and length of thin holes, the filter can not only attenuate the narrow-frequency pulsation wave, but also effectively attenuate the pulse wave with wide frequency range. The filter combines the advantages of the skin-bag filter and the H-type filter, and the filter has the advantages of reducing the number, diameter and length of the thin and long holes of the filter. Thirdly, this paper introduces the modeling method of electro-hydraulic analogy, and expounds the theoretical basis of this method in detail. By using the modeling method of electro-hydraulic analogy, the narrow-band filter is modeled, and the influence of the structure parameters of the filter on the filtering effect is simulated and analyzed by MATLAB. The results show that properly increasing the volume of the filter, decreasing the diameter of the slender hole, or increasing the length of the slender hole are beneficial to the attenuation of the pulsation. The study also shows that the fluid viscosity has a certain effect on the optimal number of slender holes in the filter. In addition, according to the characteristics of fluid pulsation in resin anchoring agent production line, a broadband filter is designed. The power bond graph modeling method is also introduced in this paper. The system power bond graph is plotted by this method, and the mathematical model of the system is deduced according to the power bond graph. Finally, MATLAB software is used to simulate and analyze the influence of the installation position and fluid viscosity of the filter on the filter filtering effect. The results show that in order to achieve the best filtering effect, when installing the filter, it is possible to keep the filter close to the pulsating source and far away from the load end. The results also show that the viscosity of the fluid will affect the attenuation effect of the filter pulsation. That is to say, in some low frequency ranges, the smaller the viscosity of the fluid is, the more beneficial it is to the attenuation of the pulsation, but in the relative high frequency range, it is just the opposite. In general, with the increase of fluid viscosity, the frequency range of the filter can attenuate pulsating waves more widely.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TQ320.79;TN713

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