Noise Source Identification of Small Fan‐BLDC Motor System for Refrigerators

Kim, Yong-Han; Yang, Bo‐Suk; Kim, Chang-Joon

doi:10.1155/ijrm/2006/63214

Cited by 4 publications

(3 citation statements)

References 11 publications

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“…Kim et al identified the source of excessive noise in a small fan-motor system for household refrigerators. They investigated an undesirable effect of cogging torque from the BLDC motor, which prevented the smooth rotation 2 Advances in Acoustics and Vibration of the rotor and resulted in noise [5]. Gue et al conducted experimental and numerical investigations on the aerodynamic noise of an axial fan to develop a low noise fan, which was used to cool a compressor and a condenser in the mechanical room of a household refrigerator [6].…”

Section: Introductionmentioning

confidence: 99%

Vibroacoustic Analysis of a Refrigerator Freezer Cabinet Coupled with an Air Duct

Çelikkan

Erol

2017

Advances in Acoustics and Vibration

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In this study, the vibration and acoustic interactions between the structure and the cavity inside the freezer cabinet were investigated. Thus, a set of numerical and experimental analyses were performed. In the numerical analysis, the acoustic characteristics of the freezer cavity were solved, and the mixed finite element method was then implemented to analyse the coupled behaviour of the cavity with the air duct using the Acoustic Fluid-Structure Interaction (AFSI) technique. In the experimental analyses, an acoustic modal analysis of the freezer cavity and a structural modal analysis of the air duct were performed for the validation process. A good agreement was obtained among the results. Thus, the accuracy of the numerical model was confirmed. The validated models were used for optimizing the design. To solve the noise generation mechanism inside the freezer cabinet, the noise primarily generated by the freezer fan unit was measured under normal working conditions of the refrigerator, and the resonance frequencies were obtained. This information was compared with the normal modes of the air duct, and the overlapping frequencies were identified. To reduce the interaction between the source and the structure, a few design modifications were applied to the air duct. Thus, the structural-borne noise radiating from the air duct into the freezer cavity was reduced.

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Section: Introductionmentioning

confidence: 99%

Vibroacoustic Analysis of a Refrigerator Freezer Cabinet Coupled with an Air Duct

Çelikkan

Erol

2017

Advances in Acoustics and Vibration

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“…However, these studies were limited to bladed-discs and not complete shaftlines. Note that there is significant literature on torsional rotordynamics that did not include the interaction of blading, including that by EPRI, Y-han Kim, Bai, and Bovsunovskii [19][20][21][22].…”

Section: Complexities and Limitations In Modellingmentioning

confidence: 99%

Rotordynamic Analysis of the AM600 Turbine-Generator Shaftline

Mudau

Field

2018

Energies

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The AM600 represents the conceptual design and layout of a Nuclear Power Plant Turbine Island intended to address challenges associated with emerging markets interested in nuclear power. When coupled with a medium sized nuclear reactor plant, the AM600 is designed with a unit capacity that aligns with constraints where grid interconnections and load flows are limiting. Through design simplification, the baseline turbine-generator shaftline employs a single low-pressure turbine cylinder, a design which to date has not been offered commercially at this capacity. Though the use of a ‘stiffer’ design, this configuration is intended to withstand, with a margin, the damage potential of torsional excitation from the grid-machine interface, specifically due to transient disturbances and negative sequence currents. To demonstrate the robust nature of the design, torsional rotordynamic analysis is performed for the prototype shaftline using three dimensional finite element modelling with ANSYS® software. The intent is to demonstrate large separation of the shaftline natural frequencies from the dominant frequencies for excitation. The analysis examined both welded drum and monoblock type Low Pressure Turbine rotors for single cylinder and double cylinder configurations. For each, the first seven (7) torsional natural frequencies (ranging from zero–190 Hz) were extracted and evaluated against the frequency exclusion range (i.e., avoidance of 1× and 2× grid frequency). Results indicate that the prototype design of AM600 shaftline has adequate separation from the dominant excitation frequencies. For verification of the ANSYS® modelling of the shaftline, a simplified lumped mass calculation of the natural frequencies was performed with results matching the finite element analysis values.

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“…The use of an alternating-current motor coupled to a servo drive for the rotation and torsional excitation of small test rotors has been investigated previously [10]. The cogging torque of brushless direct-current (DC) motors has also been used for torsional excitation [11,12]. A DC motor and a digital control system for the rotation and torsional excitation of the test rotor were considered in the current work.…”

Section: Introductionmentioning

confidence: 99%

A comparative study of finite element methodologies for the prediction of torsional response of bladed rotors

Scheepers

Heyns

2016

J Mech Sci Technol

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The prevention of torsional vibration-induced fatigue damage to turbo-generators requires determining natural frequencies by either field testing or mathematical modelling. Torsional excitation methods, measurement techniques and mathematical modelling are active fields of research. However, these aspects are mostly considered in isolation and often without experimental verification. The objective of this work is to compare one dimensional (1D), full three dimensional (3D) and 3D cyclic symmetric (3DCS) finite element (FE) methodologies for torsional vibration response. Results are compared to experimental results for a small-scale test rotor.It is concluded that 3D approaches are feasible given the current computing technology and require less simplification with potentially increased accuracy. Accuracy of 1D models is reduced due to simplifications but faster solution times are obtained. For high levels of accuracy model updating using field test results is recommended.

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Noise Source Identification of Small Fan‐BLDC Motor System for Refrigerators

Cited by 4 publications

References 11 publications

Vibroacoustic Analysis of a Refrigerator Freezer Cabinet Coupled with an Air Duct

Vibroacoustic Analysis of a Refrigerator Freezer Cabinet Coupled with an Air Duct

Rotordynamic Analysis of the AM600 Turbine-Generator Shaftline

A comparative study of finite element methodologies for the prediction of torsional response of bladed rotors

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