發(fā)布時間：2018-11-06 19:24

【摘要】：圓篩藻是一種典型的海生硅藻，生存在惡劣的海洋環(huán)境中。研究發(fā)現(xiàn)，圓篩藻殼壁精細(xì)的多級孔狀結(jié)構(gòu)優(yōu)良的彈性、韌性等相關(guān)力學(xué)性能，但對該結(jié)構(gòu)下的摩擦學(xué)性能研究尚少。本論文研究了該多級孔狀結(jié)構(gòu)的摩擦學(xué)性能，并將該結(jié)構(gòu)應(yīng)用到水潤滑軸承的摩擦學(xué)性能改性上，這對有效控制水潤滑軸承潤滑失效，提高其工作效率，具有重要意義。 本文立足國家自然科學(xué)基金面上項目“仿生硅藻典型殼壁結(jié)構(gòu)的水潤滑軸承摩擦學(xué)性能研究”(項目編號51375509),主要研究內(nèi)容如下： 本文首先介紹了硅藻的培養(yǎng)方法，發(fā)明設(shè)計并自行制造了硅藻培養(yǎng)裝置，結(jié)合ZEISSAURIGA雙束系統(tǒng)設(shè)備(掃描電子顯微鏡)，以圓篩藻為研究對象，對其進(jìn)行了圖像采集，觀察了圓篩藻的形貌結(jié)構(gòu)，發(fā)現(xiàn)圓篩藻殼壁具有精細(xì)的多級孔狀結(jié)構(gòu)。 然后，選取圓篩藻殼的一個基本單元作為研究對象，應(yīng)用ANSYS14.5中的CFX模塊對其進(jìn)行了流固耦合分析，研究了不同孔狀結(jié)構(gòu)尺寸對其承載力（抗水壓能力）、摩擦力和摩擦系數(shù)等摩擦學(xué)性能的影響，并與無孔結(jié)構(gòu)對比。數(shù)值結(jié)果表明：圓篩藻殼的單層孔狀結(jié)構(gòu)能夠增大圓篩藻在水中游動時的承載力，減小摩擦力和摩擦系數(shù)。并通過近似的實驗進(jìn)行了驗證，為硅藻殼體摩擦學(xué)研究提供了一定的參考。 進(jìn)一步，在上述研究的基礎(chǔ)上，分析計算了具有雙層孔狀結(jié)構(gòu)的圓篩藻殼在不同孔狀結(jié)構(gòu)尺寸下的摩擦學(xué)性能，并將雙層結(jié)構(gòu)與對應(yīng)的單層結(jié)構(gòu)以及無孔結(jié)構(gòu)下的性能進(jìn)行了對比。計算結(jié)果表明：具有雙層孔狀結(jié)構(gòu)的圓篩藻殼在海水中運動時，其承載力大于單層孔狀結(jié)構(gòu)的對應(yīng)值，大于無孔結(jié)構(gòu)的對應(yīng)值；摩擦系數(shù)小于單層孔狀結(jié)構(gòu)的對應(yīng)值，小于無孔結(jié)構(gòu)的對應(yīng)值。 此外，本文將與圓篩藻殼孔狀結(jié)構(gòu)相似的微造型應(yīng)用于水潤滑軸承的內(nèi)表面，應(yīng)用ANSYS14.5中的Fluent模塊對其進(jìn)行了聲功率級以及相關(guān)摩擦學(xué)性能分析。研究發(fā)現(xiàn)：與圓篩藻孔狀結(jié)構(gòu)相類似的微造型具有減小滑動軸承聲功率級噪音的作用，在一定尺寸范圍內(nèi)，，滑動軸承對應(yīng)的噪音隨著微造型深度的增大而減小，且微造型置于不同位置時，減小噪音的能力不同；適當(dāng)尺寸和位置的微造型具有提高滑動軸承承載力，減小摩擦力的作用。
[Abstract]:Chlorophyta rotundii is a typical marine diatom, living in a bad marine environment. It is found that the fine multistage pore structure with fine shell wall has excellent mechanical properties such as elasticity, toughness and so on, but the tribological properties of the structure are not studied. In this paper, the tribological properties of the multistage porous structure are studied, and the structure is applied to the modification of the tribological properties of the water-lubricated bearing, which is of great significance for effectively controlling the lubrication failure of the water-lubricated bearing and improving its working efficiency. Based on the project of National Natural Science Foundation of China, "study on tribological properties of water lubricated bearing with typical shell wall structure of bionic diatoms" (Project No. 51375509), the main contents of this paper are as follows: firstly, the cultivation method of diatom is introduced in this paper. A diatom culture device was designed and manufactured by ourselves. With ZEISSAURIGA double beam system equipment (scanning electron microscope), the image was collected and the morphology and structure of filamentous algae were observed. It was found that the shell wall had fine multilevel pore structure. Then, a basic unit of the algae shell was selected as the research object. The fluid-solid coupling analysis was carried out by using the CFX module in ANSYS14.5, and the bearing capacity (water pressure resistance) of different pore structure sizes was studied. The effects of friction force and friction coefficient on tribological properties are compared with the structure without pores. The numerical results show that the single-layer pore structure of the algae shell can increase the bearing capacity of the algae and reduce the friction force and friction coefficient. The results are verified by approximate experiments, which provides a certain reference for tribological study of diatom shell. Furthermore, on the basis of the above research, the tribological properties of the algal shell with double pore structure under different pore sizes are analyzed and calculated. The performance of the double layer structure is compared with that of the corresponding single layer structure and the non-porous structure. The results show that the bearing capacity of the shell with double pore structure is larger than the corresponding value of the single-layer pore structure and the corresponding value of the non-porous structure when it moves in the sea water. The friction coefficient is smaller than the corresponding value of the single-layer porous structure and the corresponding value of the non-porous structure. In addition, the micro-modeling similar to the pore structure of the shell of the algae is applied to the inner surface of the water-lubricated bearing. The acoustic power level and the related tribological properties of the bearing are analyzed by using the Fluent module in ANSYS14.5. It is found that the micro modeling similar to the pore structure of the algae has the effect of reducing the noise of the acoustic power level of the sliding bearing. In a certain range of dimensions, the corresponding noise of the sliding bearing decreases with the increase of the depth of the micro molding. The ability to reduce noise is different when the micro-modeling is placed in different positions. The micro-moulding with proper size and position can improve bearing capacity and reduce friction.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TH133.3;TH117

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