Fig. 1. Generation mechanism of contraction & expansion noise.
Fig. 2. Experimental setup of noise measurement.
Fig. 3. Time history of sound pressure level.
Fig. 4. Finite element model of the refrigerator.
Fig. 5. Deformation distribution of steady state thermal analysis.
Fig. 6. Boundary condition.
Fig. 7. Deformation distribution of the refrigerator.
Fig. 8. Time history of the acceleration level for contraction & expansion noise.
Fig. 9. Maximum thermal deformations for different ABS thicknessˊ.
Fig. 10. Mechanism for decreasing thermal deformation.
Fig. 11. Reinforcement method for reducing thermal deformation.
Fig. 12. Thermal deformation distribution for local ABS thickness reinforcement on the left side in F-room.
Fig. 13. Thermal deformation distribution for local ABS thickness reinforcement on the left & right side in F-room.
Fig. 14. Thermal deformation distribution for local ABS thickness reinforcement on the left & right side in F & R-room.
Table 1. The frequency of occurrence of contraction & expansion noise.
Table 2. Material properties.
Table 3. The frequency of occurrence of contraction & expansion noise without the 3rd shelf in F-room.
Table 4. Maximum thermal deformation for ABS thickness reinforcement to different positions in the refrigerator.
References
- C. H. Lee, J. H. Jeong, and J. Y. Jeon, "Evaluation of indoor refrigerator noise in steady-state condition" (in Korean), Proc. the Trans. KSNVE., Annual Autumn Conference, 790-795 (2004).
- J. H. Pyo, Reduction of frictional impulse noise iInduced by thermomechanical deformations in TV sets, (MS Thesis, KAIST, 2004).
- J. Brecht, W. Hoffrichter, and A. Dohle, "Mechanisms of brake creep groan," No.973026. SAE, Rep., 1997.
- D. I. Park, A study on correlation between noise caused by stick-slip and friction characteristics, (MS Thesis, KAIST, 2005).
- S. S. Son, J. Y. Seo, B. Y. Lee, and W. J. Kim, "A study on the structure-bone noise reduction of refrigerators using Taguchi Method" (in Korean), Trans. Korean Soc. Noise Vib. Eng., 20, 470-476 (2010). https://doi.org/10.5050/KSNVE.2010.20.5.470
- ANSYS Inc., ANYSYS Workbench User's Manual, Revision 13.0, 2011.
- E. S. Jang, Study on the thermal strain minimization of pocket-type refrigerator door, (MS Thesis, Chonnam National University, 2008).
- N. J. Mills, Polymer Foams Handbook (Elsevier, Oxford, 2007), pp. 20-35.
- J. G. Zhai, J. R. Cho, and M. S. Roh, "Optimal inner case design for refrigerator by utilizing artificial neural networks and genetic algorithm," J. Korean Society of Marine Eng., 34, 971-980 (2010). https://doi.org/10.5916/jkosme.2010.34.7.971
- J. G. Zhai, J. R. Cho, W. J. Jeon, and J. H. Kim, "The study for bead effect in inner case on thermal deformation of refrigerator" (in Korean), J. Korean Soc. Precis. Eng., 28, 98-101 (2011).