High-Frequency Noise Reduction in Mechanical Compartment of a Household Refrigerator via Dynamic Absorber Design
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ORIGINAL PAPER
High‑Frequency Noise Reduction in Mechanical Compartment of a Household Refrigerator via Dynamic Absorber Design Kyung‑Chul Park1 · Won‑Jin Kim2 · Jong‑Seob Won3 Received: 25 July 2020 / Revised: 26 August 2020 / Accepted: 28 August 2020 © Krishtel eMaging Solutions Private Limited 2020
Abstract This study presents a method to reduce high-frequency sound emitted from the mechanical compartment of a household refrigerator. The noise was found to be generated due to the structural vibration of the discharge cover attached to a linear compressor in the mechanical compartment. Based on the vibration characteristics of the conventional discharge cover, a dynamic absorber, which will be combined with the discharge cover, was designed for use in absorbing high-frequency noise in the discharge cover. Product testing for a refrigerator equipped with the modified discharge cover (which has the dynamic absorber) was performed to see if the enhanced discharge cover is useful to reduce the high-frequency sound under consideration. From noise level measurement results, it is observed that 2.5 and 1.7 dB of noise reduction effects on the front and rear sides of the refrigerator are made. Furthermore, it is found that noise in the range of 2800–3550 Hz, where the target frequency of dynamic absorber is included, is reduced. Finally, one can see the feasibility of the proposed method, and it is proven one of the viable solutions to the noise reduction issues in the household refrigerators. Keywords Noise reduction · Household refrigerator · Linear compressor · Dynamic absorber
Introduction The general interest regarding household refrigerators is aimed at higher quality and quietness; thus, their noisy behavior results in discomfort [1, 2]. In the design of refrigerators, minimization of the noises has become one of the critical factors to be considered. Accordingly, the adoption of linear compressors, instead of the conventional reciprocating compressors (lubricated refrigeration-type compressors, for example), has been made to minimize noises and to maximize energy efficiency and cooling power of refrigeration systems [3–6]. Linear compressors have a wide range of applications both refrigeration and non-refrigeration systems, due mainly to their efficiency, simplicity in the driving mechanism, non-lubricated operation, and controllability. * Jong‑Seob Won [email protected] 1
Department of Mechanical Engineering, Keimyung University, Daegu, South Korea
2
Department of Mechanical and Automotive Engineering, Keimyung University, Daegu, South Korea
3
Department of Mechanical and Automotive Engineering, Jeonju University, Jeonju, South Korea
Linear compressors have a noticeable difference in comparison to reciprocating compressors concerning the following features. One of the main features is their simplicity in the arrangement of the mechanical components and the driving mechanism according to the use of linear motors. Linear compressors may have a structure being capable of reducing friction between t
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