2RDS压缩机曲轴有限元分析

Finite Element Analysis for Crankshafts of 2RDS Compressors

压缩机曲轴在工作中受力情况极为复杂,曲轴作为压缩机最重要的零部件之一,一旦失效将会导致整个压缩机的损坏。鉴于此,以2RDS压缩机曲轴为例,采用INVENTOR三维建模软件建立曲轴模型,使用有限元分析软件ABAQUS对其进行应力分析。分析结果表明,曲轴的应力最大位置均出现在主轴颈-I的油孔处,在曲柄与曲柄销和主轴颈与曲柄销过渡圆角处均出现了应力集中,但是最大应力均小于材料的许用应力,结构不会出现静强度破坏。曲轴在压工况时的受力比拉工况时的受力更加恶劣,应力集中情况更加严重,因此在曲轴的设计过程中要充分考虑曲柄的设计厚度、宽度及连接处过渡圆弧的大小。研究结果可为压缩机曲轴的优化设计提供理论依据。

During operations, compressor crankshaft may subject to extremely complicated forces. As one of the most important components in the compressor, crankshaft may fail, and such failure may lead to damage of the entire compressor. With 2RDS compressor crankshaft as an example, crankshaft models have been established by using INVENTOR 3D modeling software to analyze forces through the finite-element analysis software-ABAQUS. Analysis results show that the maximum stress of crankshaft can be observed around the oil hole at the master shaft neck -I. At the same time, concentration of stresses can be observed around the transitional round comers between crank and crank pin and between master shaft neck and the crank pin. With the maximum stresses all below allowable stress of relevant materials, no static strength loss can be detected in structure. Under compression states, forces on the crankshaft can be more unfavorable than forces encountered during tensile state. Consequently, more severe con- centration of stresses can be observed. Cares shall be taken during design of the crankshaft to maintain sufficient thickness, width and transitional arc of the crank. Relevant research results may provide theoretical supports for optimal design of compressor crankshaft.