DBPIA-NURIMEDIA

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1 한국소음진동공학회 2015추계학술대회논문집년 Study of Noise Pattern and Psycho-acoustics Characteristic of Household Refrigerator * * ** ** Kyung-Soo Kong, Dae-Sik Shin, Weui-Bong Jeong, Tae-Hoon Kim and Se-Jin Ahn Key Words : Refrigerator(), Cooling Cycle( ), Noise Quality( ), Compressor Noise( ), Fan Noise( ), Defrost Noise( ), Noise pattern( ) ABSTRACT Operating characteristics of refrigerator changes according to conditions and repeats with specific cycle. and radiated noise fluctuates with operating characteristics. In this study, Record 14 refrigerators considering housing environment and classify into 4 types based on components. and Analyze the changes of noise pattern and characteristic of sound quality index for each type. Finally, This study is expected to be used as a useful source in psycho-acoustics study of refrigerators noise ,.,.,,,. Joo (1) 4~5 khz. Jung (2) BPF(Blade Passing Frequency). Choi (3). Hasan (4) crack noise,.. (5)(6) ;, sjahn@uu.ac.kr * ** () LG c The Korean Society for Noise and Vibration Engineering -309-

2 .., ,,... (1) (Compressor).,. 50~60Hz. (2) (C-fan: Condensor fan). BPF. (3) (In chamber fan), (F-fan: Freezer-fan), (R-fan: Refrigerator fan), (I-fan: Ice making room-fan). 1~3 BPF. (4). 2 (slug flow). (7) (5) (Evaporator). (Impulsive) Table 1 4 Table

3 Table 1. Components of Each Ref. Type (1) Type A:... (2) Type B:.,. Table 2. Cycle of 4-Types Ref. at Normal Condition (3) Type C: Type B. (I-fan) I-fan Type B. (4) Type D: Type B (R-fan). Type B R-fan. 10., (cut-off frequency: 80Hz, Background noise level: 17dB)... Pilot test, Fig. 1 1m

Figure 1. Schematic of Recording Ref. Noise..,. 14. 14 Type A 6, Type B 3, Type C 3, Type D 2. 3.2.. (C-fan) 30dB(A).., 3dB(A). (Sound quality).

4 Figure 1. Schematic of Recording Ref. Noise.., Type A 6, Type B 3, Type C 3, Type D (C-fan) 30dB(A).., 3dB(A). (Sound quality) (SPL) - (Contour map) Fig. 2. Fig. 2 (a) Type A. Fig. 2 (b) Type B SPL,.. Fig. 2 (c) Type C Type B. 10dB. Type C - Type B 3. Fig. 2 (d) Type D dB(A). Type B

5 (a) Type A (c) Type C (b) Type B (d) Type D Figure 2 SPL of 4-Types Ref. 3.3 (Psycho-acoustics) (Quality) 4. 4 (Loudness), (Sharpness), (Roughness), (Fluctuation Strength) -313-

6 (a) Type A (c) Type C (b) Type B (d) Type D Figure 3. Sound Quality Index of 4-Types Ref

7 ,. 4 4 Fig. 3. Loudness 4 SPL. Sharpness. SPL. Roughness SPL. Fluctuation strength Type B SPL Type C 0.5 vacil. F/Strength. 4., Loudness Roughness SPL, Sharpness Fluctuation Strength SPL.. LG. (1) Joo J. M., Kim, J. R. and Lee, D. H., 2001, Measurement and Control of Abnormal Sound for Refrigerator, Proceedings of the KSNVE Annual Spring Conference, pp. 380~384. (2) Jung, Y. K., Kim, C. J., Baek, S. J. and Jeon, W. H., 2002, Study on the Optimal Shape of Low Noise, New Concept Fan for Refrigerator, Proceedings of the KSNVE Annual Spring Conference, pp. 645~650. (3) Choi, S. W., Hwang, W. G., Seung-Yun., Im, H. E. and Kim, S. S., 2004, A Study on Reduction of Refrigerant Noise in Household Refrigerator, Proceedings of the KSNVE Annual Autumn Conference, pp. 1062~1066. (4) Hasan Koruk, Ahmet Arisoy, 2015, Identification of crack noise in household refrigerators, Transactions of Applied Acoustics, Vol. 89, pp. 234~243. (5) Park, J. G., Cho, Y., Lee, S. W., Hwang, D. S. and Lee, C. H., 2009, Objective Assessment Model for Refrigerator Noises, Transactions of the Institute of Electronics and Information Engineers, Vol. 46, No. 5, pp. 80~90. (6) Jeon, J. Y., You, J. and Chang, H. Y., 2007, Sound radiation and sound quality characteristics of refrigerator noise in real living environments, Transactions of Applied Acoustics, Vol. 68, No. 10, pp. 1118~1134. (7) Daniel Hartmann, Claudio Melo, 2013, Popping Noise in household refrigerators: Fundamentals and practical solutions, Transactions of Applied Thermal Engineering, Vol. 51, No. 1-2, pp. 40~

DBPIA-NURIMEDIA

DBPIA-NURIMEDIA Trans. Korean Soc. Noise Vib. Eng., 26(2) : 121~129, 2016 한국소음진동공학회논문집제 26 권제 2 호, pp. 121~129, 2016 http://dx.doi.org/10.5050/ksnve.2016.26.2.121 ISSN 1598-2785(Print), ISSN 2287-5476(Online) 가정용냉장고에서방사되는소음의패턴분석