Development of a low-noise cooling fan for an alternator using numerical and doe methods

Kim, Wonsuk; Jeon, Wan Ho; Hur, Nahmkeon; Hyun, J. J.; Lim, Cheolseung; Lee, S. H.

doi:10.1007/s12239-011-0036-6

Cited by 17 publications

(2 citation statements)

References 5 publications

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“…The method can optimize the spectra of the aerodynamic noise, and can conveniently predict the orders’ noise with bigger amplitude. With the combination of the Design of Experiments (DOE) and the simulation, considering blade chord length, in-flowing angle, blade number and so on, KIM 11 optimized a claw pole alternator using the Taguchi method. The optimization goal was to decrease the sound pressure level A on the premise to satisfy the airflow of the alternator.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation and optimization of aerodynamic noise for claw pole alternator

Zuo

Xie

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part C:

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This study aims at minimizing the aerodynamic noise generated by claw pole alternator used in vehicles. In this paper, an effective and efficient hybrid test-analysis engineering approach has been proposed to predict and optimize acoustic performance of claw pole alternator. First, an experimental analysis was performed to predict the main components of the aerodynamic noise generated by the claw pole alternator. Then a hybrid approach was proposed to calculate the aerodynamic noise of the alternator. A computational fluid dynamics model of the claw pole alternator was developed for calculating the flow-field of the alternator. The pressure fluctuation in the flow field was analyzed to validate the computational fluid dynamics simulation. After the computational fluid dynamics simulation, the far-field aerodynamic noise generated by the flow field was calculated by adopting the acoustic finite element method. The accuracy and feasibility of the acoustic finite element model were validated with the experimental data. After the validation, the effects of the cooling fan parameters on the aerodynamic noise of the alternator were discussed and analyzed. According to the sound source information and the generation mechanism of the aerodynamic noise, the blade spacing angle of the cooling fan was optimized by establishing a theoretical model. The blade chord length of the cooling fan, the blade installation angle of the cooling fan and the tilt angle of the grille on end cap were optimized by structuring different surrogate models. After the optimizations, a significant reduction in the noise level of the claw pole alternator was found by the finite element method simulation. The overall sound power level has been decreased by about 6 dB (A).

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Section: Introductionmentioning

confidence: 99%

Numerical simulation and optimization of aerodynamic noise for claw pole alternator

Zuo

Xie

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part C:

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show abstract

“…In the aspect of numerical simulation research, Neise pointed out that dipole point source could be used to describe the aerodynamic noise caused by the high-speed rotation of centrifugal cooling fan [16,17]. Based on the research of Neise, W. Kim [18] adopted commercial CFD software and acoustic software Flow Noise S/W to maximize fan flow and minimize sound pressure levels of noises based on the optimum design of Taguchi method and obtained the optimized rear fan blades of alternators through optimizing the design parameters of rear fan blades of alternators. However, standard -model was used as the prediction model of aerodynamic noises.…”

Section: Introductionmentioning

confidence: 99%

Numerical research on aerodynamic radiation noises of alternators in vehicles

Zhang¹

2017

J. vibroeng.

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To study the aerodynamic noise characteristics of alternators in vehicles, this paper established a computational model for the aerodynamic noise of an alternator based on computational fluid dynamics (CFD). The alternator adopted a non-scaling model and considered the detailed structure of collectors and other parts. Based on Lighthill acoustic theory, this paper adopted three-dimensional and large eddy simulation (LES) to conduct an unsteady numerical simulation for the flow field around the alternator, and Ffowcs Williams-Hawkings (FW-H) model was then adopted to conduct an unsteady computation for the aerodynamic noise of the alternator in the far field. When the rotational speed of the alternator was 10000 r/min, this paper obtained the aerodynamic noise characteristics of the alternator and the unsteady flow field structure around the alternator. Studied results showed: The main aerodynamic noise sources of the alternator were front fan, rear fan and stator structure; main influence orders of aerodynamic noises were the 6th, 8th, 10th, 12th, 18th, 24th, 30th and 36th orders. Similarly, this paper also conducted an experimental test on the noise of vehicle alternators. The main influence orders of aerodynamic noises of alternators were the 6th, 8th, 10th, 12th, 18th, 24th, 30th and 36th orders, which was consistent with the working condition of numerical simulation. It showed the correctness of computational results in this paper. In addition, this paper adopted the method of vector synthesis and the distribution of fan blades of the alternator to explain the cause of various orders and provided engineering application foundation for further reducing the noise of main orders.

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Characteristics of unsteady flow field and flow-induced noise for an axial cooling fan used in a rack mount server computer

Lim¹,

Jeon²,

Minorikawa

2016

J Mech Sci Technol

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Development of a low-noise cooling fan for an alternator using numerical and doe methods

Cited by 17 publications

References 5 publications

Numerical simulation and optimization of aerodynamic noise for claw pole alternator

Numerical simulation and optimization of aerodynamic noise for claw pole alternator

Numerical research on aerodynamic radiation noises of alternators in vehicles

Characteristics of unsteady flow field and flow-induced noise for an axial cooling fan used in a rack mount server computer

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