• Title/Summary/Keyword: 송풍소음

Search Result 62, Processing Time 0.035 seconds

직사각형 통에 설치된 축류 홴의 소음 특성

  • 최정명;구정호
    • Journal of KSNVE
    • /
    • v.1 no.2
    • /
    • pp.102-106
    • /
    • 1991
  • 최근의 사회적 경제적인 급속한 발전에 따라 환경 소음에 대한 사람들의 관심도가 점차 증가되고 있다. 이로 인하여 사람들이 항상 접촉하게 되는 가전 제품 에 대한 소비자의 욕수도 제품의 성능적인면도 물론이지만 소음진동 및 디자인에 대하여도 지대한 관심이 모아지고 있다. 가전 제품에 있어서 주된 소음원은 홴 및 압축기 덮개의 진동등으로 파악할 수 있다. 특히, 홴은 냉각용, 송풍용으로서 거의 모든 가전제품에 쓰여지고 있다. 냉각용으로 사용되는 형식은 주로 축류 홴이다. 축류 홴은 다른 종류보다 소음이 크기 때문에, 저소음 축류 홴의 BPF(Blade Passing Frequency; 날개 통과 주파수)가 갖는 소음 특성을 연구하여야 한다. 이를 위해 축류 홴의 날개 갯수를 조절하면 설치된 통내에서의 BPF가 어떠한 형태로 변화하는가를 알아보고, 이에 따른 저소음화 대책을 검토하고자 한다. 홴은 그 덮개에 대하여 유량 및 소음에 관한 최적의 위치가 존재하는데, 문이 잠겨 있을 때에는 그 소음 레벨의 편차가 몹시 크게 된다. 한편 날개 갯수, 모터의 회전속도 및 통의 전달 함수 등을 감안하여 날개 통과 주파수(BPF)를 조정하면, 각종 가전 제품의 홴에 의한 방사를 저감시킬수 있다.

  • PDF

Development of a Low-noise Regenerative Blower for Fuel Cell Application (연료전지용 저소음 재생형 송풍기의 개발)

  • Kim, Jun Kon;Lee, Kwang Yeong;Lee, Chan;Kil, Hyun Gwon;Chung, Kyung Ho;Hwang, Sang Moon
    • The KSFM Journal of Fluid Machinery
    • /
    • v.17 no.2
    • /
    • pp.48-53
    • /
    • 2014
  • A low-noise regenerative blower is developed for fuel cell application by combining the FANDAS-Regen code and design optimization algorithm under several performance constraints for flow capacity, static pressure, efficiency and power consumption. The optimized blower design model is manufactured with some impeller modification based on low noise design concept and tested by using aerodynamic performance chamber facility and narrow-band noise measurement apparatus. The measured results of the optimized blower satisfy the performance requirements and are also compared favorably with the FANDAS-Regen prediction results within a few percent relative error. Furthermore, the present study shows the remarkable noise reduction by 26 dBA can be achieved through design optimization and low noise design concept.

Noise source identification of a pulse combustion burner by digital signal processing techniques (디지탈 신호처리 기법을 이용한 맥동연소기의 소음원 규명에 관한 연구)

  • 송척기;조정길;이관수;오재응
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 1990.10a
    • /
    • pp.9-14
    • /
    • 1990
  • 맥동 연소기는 기존의 연속 연소식 연소기에 비하여 높은 열효율, 소형화, 연소과정의 개선, 시동후 점화플러그 및 송풍팬의 불필요, 자력 배기와 장시 간 안전 운전등의 장점들로 인하여 최근 연구대상으로서 주목을 받고 있다. 맥동연소 현상은 1800년경부터 알려졌음에도 불구하고 기본적인 연소메카니 즘 및 기본동작 원리에 대한 미비점 및 높은 소음 등으로 인하여 종래의 연 구는 거의 실험을 통하여 이루어 졌으며 이러한 것들이 현재까지도 맥동 연 소기의 발전에 걸림돌이 되고 있다. 맥동 연소기가 산업용 및 가정용 열기기 로서 사용되기 위하여 진동과 소음의 감소에 대한 엄격한 요구를 만족하지 않으면 안된다. 따라서, 그에 대한 효과적인 방지 설계를 하기 위하여 진동 원과 소음원이 어느 부위에서 전달되어 오는지를 파악하는 것이 중요하다.. 본 연구에서는 맥동연소기의 소음원을 규명하기 위하여 종래에 사용되어 온 주파수 응답함수법과 소음원간에 강한 상관관계가 존재하는 경우에 사용되 는 기여도함수법을 이용하여 다차원 스펙트럼해석법에 의하여 입출력간의 기여관계를 규명하였다.

  • PDF

Noise & Vibration Evaluation and Analysis for Propeller Fan System of Air Conditioner Outdoor Unit (에어컨 실외기 프로펠러 홴계의 진동소음 평가 및 해석)

  • Park, Deug-Yong;Mo, Jin-Yong;Lee, Jin-Kyo;Koo, Hyoung-Mo;Choi, Weon-Seok
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2000.06a
    • /
    • pp.1405-1409
    • /
    • 2000
  • The electro-magnetic noise generated from fan-driving motor is one of important items in view of abnormal noise which affect the quality of air conditioner noise. The electro-magnetic noise of the outdoor unit is identified by the serial experiments for related parts, whose effects are verified to give proper measures for reduced noise level. The weight of fan appears to be the most important factor, and the stiffness of the frame, such as motor bracket is shown to be important also.

  • PDF

Study on the Development for Low Noise Indoor Unit Package Air-Conditioner (저소음 패키지형 공기조화기의 실내기 개발에 관한 연구)

  • 이재효;조성철;김태헌
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
    • /
    • v.15 no.6
    • /
    • pp.518-523
    • /
    • 2003
  • The purpose of this study was to reduce the noise emitted from the package air-conditioner. The optimum design methods of the fans ware investigated experimentally through the analysis of noise problem caused by the conventional PAC system. New PAC system had decreased 6 dBA in overall noise level as compared with the conventional system by various technology.

Acoustic Analysis of Axial Fan using BEM based on Kirchhoff Surface (Kirchhoff Surface 변화에 따른 송풍기 소음의 BEM 해석)

  • 박용민;이승배
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2002.05a
    • /
    • pp.772-777
    • /
    • 2002
  • A BEM is highly efficient method in the sense of economic computation. However, boundary integration is not easy for the complex and moving surface e.g. in a rotating blade. Thus, Kirchhoff surface is designed in an effort to overcome the difficulty resulting from complex boundary conditions. A Kirchhoff surface is a fictitious surface which envelopes acoustic sources of main concern. Acoustic sources may be distributed on each Kirchhoff surface element depending on its acoustic characteristics. In this study, an axial fan is assumed to have loading noise as a dominant source. Dipole sources can be computed based on the FW-H equation. Acoustic field is then computed by changing Kirchhoff surfaces on which near-field is implemented, to analyze the effect of Kirchhoff surface on it.

  • PDF

A Computerized Axial Flow Fan Design System for Noise and Performance Analysis (성능 및 소음 해석 기능이 수반된 전산화된 축류 송풍기 설계 체제)

  • Chung, Dong-Kyu;Noh, Jun-Gu;Seo, Jae-Young;Lee, Chan
    • 유체기계공업학회:학술대회논문집
    • /
    • 2001.11a
    • /
    • pp.37-42
    • /
    • 2001
  • A computerized axial flow fan design system is developed with the capabilities for predicting the aerodynamic performance and the noise characteristics of fan. In the present study, the basic fan blading design is made by combining vortex distribution scheme with camber line design, airfoil selection, blade thickness distribution and stacking of blade elements. With the designed fan blade geometry, the through-flow field and the performance of fan are analyzed by using the streamline curvature computing scheme with spanwise total pressure loss and flow deviation models. Fan noise is assumed to be generated due to the pressure fluctuation induced by wake vortices of fan blades and to radiate as dipole distribution. The vortex-induced fluctuating pressure on blade surface is calculated by combining thin airfoil theory and the predicted flow field data. The predicted performances, sound pressure level and noise directivity patterns of fan by the present method are favorably compared with the test data of actual fans. Furthermore, the present method is shown to be very useful in designing the blade geometry of new fan and optimizing design variables of the fan to achieve higher efficiency and lower noise level.

  • PDF

Development of a High-efficiency and Low-noise Axial Flow Fan through Combining FanDAS and CFX codes (FanDAS-CFX 결합을 통한 고효율-저소음 축류 송풍기의 개발)

  • Lee, Chan;Kil, Hyun Gwon;Noh, Myung-Keun
    • The KSFM Journal of Fluid Machinery
    • /
    • v.15 no.5
    • /
    • pp.37-41
    • /
    • 2012
  • High-efficiency and low-noise axial flow fan is developed by combining the FanDAS, a computerized axial fan design/performance analysis system, and CFD software(CFX). Based on fan design requirements, FanDAS conducts 3-D blade geometry design, quasi-3D flow/ performance analyses and noise evaluation by using through-flow analysis method and noise models for discrete frequency and broadband noise sources. Through the parametric studies of fan design variables using FandDAS, preliminary and baseline design is achieved for high efficiency and low noise fan, and then can be coupled with a CFD technique such as the CFX code for constructing final and optimized fan design. The FanDAS-CFX coupled system and its design procedure are applied to actual fan development practice. The FanDAS provides an optimized 3-D fan blade geometry, and its predictions on the performance and the noise level of designed fan are well agreed with actual test results.

Assessment of Numerical Optimization Algorithms in Design of Low-Noise Axial-Flow Fan (축류송풍기의 저소음 설계에서 수치최적화기법들의 평가)

  • Choi, Jae-Ho;Kim, Kwang-Yong
    • Transactions of the Korean Society of Mechanical Engineers B
    • /
    • v.24 no.10
    • /
    • pp.1335-1342
    • /
    • 2000
  • Three-dimensional flow analysis and numerical optimization methods are presented for the design of an axial-flow fan. Steady, incompressible, three-dimensional Reynolds-averaged Navier-Stokes equations are used as governing equations, and standard k- ${\varepsilon}$ turbulence model is chosen as a turbulence model. Governing equations are discretized using finite volume method. Steepest descent method, conjugate gradient method and BFGS method are compared to determine the searching directions. Golden section method and quadratic fit-sectioning method are tested for one dimensional search. Objective function is defined as a ratio of generation rate of the turbulent kinetic energy to pressure head. Two variables concerning sweep angle distribution are selected as the design variables. Performance of the final fan designed by the optimization was tested experimentally.