变截面涡旋盘谐响应分析及啮合涡旋盘的固有模态分析

发布时间：2018-04-27 01:11

本文选题：涡旋压缩机 + 模态分析　；参考：《兰州理工大学》2017年硕士论文

【摘要】：近年来,随着制造工艺的不断发展,使得涡旋压缩机的制造越来越经济可行,随之而来的是涡旋压缩机的应用范围越来越广。而动力学作为涡旋压缩机研究方向的重点之一,其动力学性能的研究也越来越得到人们的重视。为更贴近实际工况的研究涡旋盘的动力学特性,本文建立了涡旋盘的三维实体模型并通过有限元软件进行仿真分析,得到了相应的动力学特性。具体内容主要包括以下几个方面:(1)建立了以“圆渐开线-高次曲线”为涡旋型线的涡旋盘三维模型,并对其进行了受力分析,得到了作用在涡旋盘上的切向气体力和法向气体力的数值。后对整个涡旋盘进行模态分析,得到了在有气体力作用下的涡旋盘的前六阶固有模态振型。通过模态叠加法对涡旋盘进行谐响应分析,得到了在不同谐振频率下的涡旋盘内壁面和外壁面的位移量。(2)分别建立了以“圆渐开线”为涡旋型线的动涡旋盘与静涡旋盘的三维模型,对其进行虚拟装配后,导入有限元分析软件,分析得到了该啮合系统的前六阶固有模态振型。通过赋予两个涡旋盘两种不同的材料属性,分别为:灰口铸铁和铝合金。在赋予材料属性后对啮合系统进行仿真分析,得到了三组系统不同的固有模态振型。(3)分别建立了以“圆渐开线-高次曲线”为涡旋型线的动涡旋盘与静涡旋盘的三维实体模型,对其进行虚拟装配后,导入有限元分析软件分析,得到了该系统的6阶固有振动模态振型。同样,赋予涡旋盘三种不同材料属性,分别为:灰口铸铁和铝合金。在赋予材料属性后对该系统进行仿真分析,得到了三组不同的固有模态振型。(4)通过对比单涡旋盘的固有模态频率及啮合后的涡旋盘的固有频率,发现啮合后的涡旋盘的固有频率低于单个涡旋盘的固有频率,从侧面说明对单个涡盘进行模拟分析时与实际工况存在一定的偏差。通过对比由不同材料构成的涡旋盘的固有模态,得到了一种通过改变涡旋盘材料的方法来提高涡旋盘固有频率的方法。通过对比等截面和变截面涡旋盘固有频率,得到了一种通过优化型线设计而提高涡旋盘固有频率的方法。
[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.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH45

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