Eventos Anais de eventos
DINAME 2017
XVII International Symposium on Dynamic Problems of Mechanics
Structural characterization of the block and stator group of a hermetic compressor
Submission Author:
Jean Carlos Marcon , SC
Co-Authors:
Jean Carlos Marcon, Arcanjo Lenzi, Olavo M. Silva, Walter dos Santos Sousa
Presenter: Jean Carlos Marcon
doi://10.26678/ABCM.DINAME2017.DIN17-0091
Abstract
Abstract: The vibroacoustic analysis of structures and equipment has become important due to the search for reliability, energy efficiency and comfort in product development. In homes, sound quality is directly dependent on devices that produce low noise levels. Hermetic compressors present in these environments are important noise sources that require design studies and changes to minimize radiated noise. In this context, the Finite Element Method (FEM) provides satisfactory computational representations that allow the study of these products at a reduced cost. Considering that one of the main sources of the vibration and noise of a hermetic compressor is the block and stator group, which supports the entire load during the cyclical process of refrigerant gas compression, this paper presents the application of the FEM to the characterization of these components. The block was partitioned into three regions for the fitting of the different isotropic properties. In the case of the laminated stator, the homogenization method was applied for the determination of equivalent orthotropic properties for the volume of the blades and the boundary conditions provided by bolted joints. Obtaining a set of physical properties is based on the minimization of the residuals between the numerical and experimental natural frequencies in the frequency range of 0-10 kHz. Therefore, we used the multi-objective genetic algorithm method (MOGA) together with commercial software Ansys®. The technique that considers the block division into different isotropic regions provided better results than considering a uniform piece, confirming its efficacy in the computational representation of components that have geometric constraints and variations in the microstructural properties arising from the manufacturing process. The simplified model of the stator obtained by the method of homogenization showed satisfactory experimental correlation. By applying the boundary conditions between the block and the stator a simplified group model was obtained and validated experimentally. Finally, the group model enables the realization of advanced studies for the purpose of promoting vibroacoustic improvements.
Keywords
finite element, Model Updating, hermetic compressor., Hermetic Compressor, Finite Element Method
