树脂锚固剂生产线胶泥管路系统流体脉动抑制研究

发布时间：2019-02-25 14:10

【摘要】：树脂锚固剂是一种广泛应用于隧道施工、建筑物加固、水电工程预应力锚杆加固等领域的材料。然而大部分锚固剂依靠手工生产，导致生产效率低、劳动强度大且质量不稳定。目前自动化的树脂锚固剂生产线正逐渐替代手工生产，但是也存在一些问题，例如在两挤压缸交替工作送料时，在衔接处会出现出料不连续问题，导致装袋质量不合格。造成该问题的根本原因是，两挤压缸在交替工作的衔接处出现压力脉动，从而导致流量脉动。针对该问题，本文首先研究了流体脉动抑制理论基础，对流体脉动的机理、管路动态特性、滤波器滤波效果评价方法等做了深入研究，为滤波器结构设计以及滤波特性分析奠定了基础。其次，研究了现有脉动抑制方法，详细阐述了皮囊式滤波器、抗性滤波器和阻性滤波器等被动式滤波器的滤波原理。分析了各种被动式滤波器的优缺点，并在此基础上设计了一种新型的滤波器。该滤波器结合了皮囊式滤波器和H型滤波器的优点，通过改变滤波器细长孔的数目、直径和长度，，既能衰减窄频的脉动波，又能对频率范围较宽的脉动波进行有效的衰减。再次，本文引入了电液比拟的建模方法，详细阐述了该方法的理论基础。运用电液比拟的建模方法，对针对窄频的滤波器进行了建模，并用MATLAB对滤波器各结构参数对滤波效果的影响进行了仿真分析。研究表明，适当增加滤波器的体积、减小细长孔的直径，或者增加细长孔的长度都有利于脉动的衰减。研究还表明，流体粘度对滤波器最佳细长孔个数有一定的影响。此外，根据树脂锚固剂生产线流体脉动特点，设计了一种宽频滤波器。文章还引入了功率键合图建模方法，用该方法绘制出了系统功率键合图，并且根据所绘制的功率键合图推导出了系统数学模型。最后，运用MATLAB软件仿真分析了滤波器的安装位置和流体粘度对滤波器滤波效果的影响。结果表明，为了使滤波器滤波效果达到最佳，在安装滤波器时，尽可能使滤波器靠近脉动源而远离负载端。研究结果还表明，流体粘度会影响滤波器脉动衰减效果。即在某些低频率范围内，流体粘度越小越有利于脉动的衰减；而在相对某些高频范围内却恰恰相反。总的来说，随流体粘度增大，滤波器所能衰减脉动波的频率范围更广。
[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.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ320.79;TN713

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