本文選題：渦旋壓縮機 + 模態(tài)分析　； 參考：《蘭州理工大學》2017年碩士論文

【摘要】：近年來,隨著制造工藝的不斷發(fā)展,使得渦旋壓縮機的制造越來越經濟可行,隨之而來的是渦旋壓縮機的應用范圍越來越廣。而動力學作為渦旋壓縮機研究方向的重點之一,其動力學性能的研究也越來越得到人們的重視。為更貼近實際工況的研究渦旋盤的動力學特性,本文建立了渦旋盤的三維實體模型并通過有限元軟件進行仿真分析,得到了相應的動力學特性。具體內容主要包括以下幾個方面:(1)建立了以“圓漸開線-高次曲線”為渦旋型線的渦旋盤三維模型,并對其進行了受力分析,得到了作用在渦旋盤上的切向氣體力和法向氣體力的數值。后對整個渦旋盤進行模態(tài)分析,得到了在有氣體力作用下的渦旋盤的前六階固有模態(tài)振型。通過模態(tài)疊加法對渦旋盤進行諧響應分析,得到了在不同諧振頻率下的渦旋盤內壁面和外壁面的位移量。(2)分別建立了以“圓漸開線”為渦旋型線的動渦旋盤與靜渦旋盤的三維模型,對其進行虛擬裝配后,導入有限元分析軟件,分析得到了該嚙合系統(tǒng)的前六階固有模態(tài)振型。通過賦予兩個渦旋盤兩種不同的材料屬性,分別為:灰口鑄鐵和鋁合金。在賦予材料屬性后對嚙合系統(tǒng)進行仿真分析,得到了三組系統(tǒng)不同的固有模態(tài)振型。(3)分別建立了以“圓漸開線-高次曲線”為渦旋型線的動渦旋盤與靜渦旋盤的三維實體模型,對其進行虛擬裝配后,導入有限元分析軟件分析,得到了該系統(tǒng)的6階固有振動模態(tài)振型。同樣,賦予渦旋盤三種不同材料屬性,分別為:灰口鑄鐵和鋁合金。在賦予材料屬性后對該系統(tǒng)進行仿真分析,得到了三組不同的固有模態(tài)振型。(4)通過對比單渦旋盤的固有模態(tài)頻率及嚙合后的渦旋盤的固有頻率,發(fā)現嚙合后的渦旋盤的固有頻率低于單個渦旋盤的固有頻率,從側面說明對單個渦盤進行模擬分析時與實際工況存在一定的偏差。通過對比由不同材料構成的渦旋盤的固有模態(tài),得到了一種通過改變渦旋盤材料的方法來提高渦旋盤固有頻率的方法。通過對比等截面和變截面渦旋盤固有頻率,得到了一種通過優(yōu)化型線設計而提高渦旋盤固有頻率的方法。
[Abstract]:In recent years, with the continuous development of manufacturing technology, the manufacture of scroll compressor becomes more and more economical and feasible, and the application of scroll compressor becomes more and more extensive. As one of the key research directions of scroll compressor, dynamics has been paid more and more attention to. In order to study the dynamic characteristics of the vortex disk more closely to the actual working conditions, the three-dimensional solid model of the vortex disk is established and simulated by finite element software, and the corresponding dynamic characteristics are obtained. The main contents include the following aspects: 1) the three-dimensional model of the vortex disk with the "circular involute and high order curve" as the vortex profile is established, and the force on it is analyzed. The values of the tangential gas force and the normal gas force acting on the vortex disk are obtained. Then the modal analysis of the whole vortex disk is carried out, and the first six natural modal modes of the vortex disk under the action of air force are obtained. The harmonic response of vortex disk is analyzed by modal superposition method. The displacement of the inner and outer wall surfaces of the vortex disk at different resonant frequencies is obtained. The three-dimensional models of the moving vortex disk and the static vortex disk with the "circular involute" as the vortex profile are established, respectively, and the virtual assembly is carried out. The first six natural modes of the meshing system are obtained by introducing the finite element analysis software. By endowing two kinds of different material properties, they are gray cast iron and aluminum alloy. The meshing system is simulated and analyzed after the material attribute is given, and three groups of different inherent modal modes of the system are obtained. The three-dimensional solid models of the moving vortex disk and the static vortex disk with the "circular involute high order curve" as the vortex profile are established respectively. After virtual assembly, the software of finite element analysis was used to analyze the vibration mode of the system, and the natural vibration mode of the system was obtained. Similarly, the scroll disk is given three different material properties: grey cast iron and aluminum alloy. After the material attribute is given, the simulation analysis of the system is carried out, and three groups of different natural mode modes are obtained. By comparing the natural mode frequency of the single scroll disk with the meshing vortex disk, the natural frequency of the meshing vortex disk is obtained. It is found that the natural frequency of the meshing vortex disk is lower than that of the single vortex disk. By comparing the natural modes of the vortex disk made up of different materials, a method of increasing the natural frequency of the vortex disk by changing the material of the scroll disk is obtained. By comparing the natural frequencies of the vortex disk with constant section and variable section, a method of increasing the natural frequency of vortex disk by optimizing the profile design is obtained.
【學位授予單位】：蘭州理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TH45

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