Fan noise duct-mode detection in the far-field - Simulation, measurement and analysis

1979 ◽  
Author(s):  
B. TESTER ◽  
A. CARGILL ◽  
B. BARRY
Keyword(s):  
Far Field ◽  
Fan Noise ◽  
Mode Detection ◽  
Field Simulation ◽  
Measurement And Analysis

Handling of quasi-Gaussian beams by phase plates: far-field simulation

1994 ◽  
Vol 33 (16) ◽  
pp. 3465 ◽  
Author(s):  
V. Biancalana ◽  
P. Chessa
Keyword(s):  
Gaussian Beams ◽  
Far Field ◽  
Field Simulation ◽  
Phase Plates

Noise Characteristics of Automobile Cooling Fan Based on Circumferential Mode Analysis

2021 ◽  
Author(s):  
Pengfei Chai ◽  
Zonghan Sun ◽  
Zhiqiang Chang ◽  
Zhigang Peng ◽  
Jie Tian ◽  
...  
Keyword(s):  
Automobile Industry ◽  
Cooling System ◽  
Tip Clearance ◽  
Mode Analysis ◽  
Far Field ◽  
Axial Fan ◽  
Fan Noise ◽  
Cooling Fan ◽  
Noise Characteristics ◽  
Cooling Fans

Abstract The fan is the main component of the cooling system of an automobile engine. A typical automobile cooling fan consists of a shrouded axial fan, stator vanes, a deflector, and a cover. With recent developments in the automobile industry, the increase in the speed of rotation and blade load of cooling fans has increased the noise generated by them. To reduce it, it is important to analyze the characteristics of this noise. This paper uses an acoustic test to examine the characteristics of flow and noise of automobile cooling fans. The frequency spectrum and far-field radiation of the noise of the fan are first analyzed through far-field measurements, and the influence of the single rotor, tip clearance of the blade, and cover on fan noise is studied. The distribution of the mode spectrum and characteristics of sound propagation of discrete tonal noise are then examined using the circumferential mode test. The influence of the flow structure on fan noise is also studied. The flow characteristics and distribution of the source of noise of the automobile cooling fan are then used to analyze the influence of the structure of the fan on the noise generated by it. The results can help develop designs to reduce the noise of automobile cooling fans.

Noise Characteristics of Automobile Cooling Fan Based On Circumferential Mode Analysis

2021 ◽  
Author(s):  
Pengfei Chai ◽  
Zonghan Sun ◽  
Zhiqiang Chang ◽  
Zhigang Peng ◽  
Jie Tian ◽  
...  
Keyword(s):  
Automobile Industry ◽  
Cooling System ◽  
Tip Clearance ◽  
Mode Analysis ◽  
Far Field ◽  
Axial Fan ◽  
Fan Noise ◽  
Cooling Fan ◽  
Noise Characteristics ◽  
Cooling Fans

Abstract The fan is the main component of the cooling system of an automobile engine. A typical automobile cooling fan consists of a shrouded axial fan, stator vanes, a deflector, and a cover. With recent developments in the automobile industry, the increase in the speed of rotation and blade load of cooling fans has increased the noise generated by them. To reduce it, it is important to analyze the characteristics of this noise. This paper uses an acoustic test to examine the characteristics of flow and noise of automobile cooling fans. The frequency spectrum and far-field radiation of the noise of the fan are first analyzed through far-field measurements, and the influence of the single rotor, tip clearance of the blade, and cover on fan noise is studied. The distribution of the mode spectrum and characteristics of sound propagation of discrete tonal noise are then examined using the circumferential mode test. The influence of the flow structure on fan noise is also studied. The flow characteristics and distribution of the source of noise of the automobile cooling fan are then used to analyze the influence of the structure of the fan on the noise generated by it. The results can help develop designs to reduce the noise of automobile cooling fans.

Far-field measurement and mode analysis of the effects of vane/bladeratio on fan noise

1984 ◽  
Author(s):  
P. SCHWALLER ◽  
A. PARRY ◽  
M. OLIVER ◽  
A. ECCLESTON
Keyword(s):  
Field Measurement ◽  
Mode Analysis ◽  
Far Field ◽  
Fan Noise

Fan Noise Source Diagnostic Test -- Far-field Acoustic Results

2002 ◽  
Author(s):  
Richard Woodward ◽  
Christopher Hughes ◽  
Robert Jeracki ◽  
Christopher Miller
Keyword(s):  
Diagnostic Test ◽  
Noise Source ◽  
Far Field ◽  
Fan Noise

Compressive Sensing Approach for Aeroengine Fan Noise Mode Detection

2018 ◽  
Author(s):  
Huanxian Bu ◽  
Wenjun Yu ◽  
Xun Huang
Keyword(s):  
Compressive Sensing ◽  
Sensor Array ◽  
Wind Tunnel Test ◽  
Test Method ◽  
Fan Noise ◽  
Noise Interference ◽  
Mode Detection ◽  
Flow Speeds ◽  
Noise Test ◽  
Set Up

To further simplify the sensor array set-ups and improve the mode detection capability for the aeroengine fan noise test, a new compressive sensing based methodology has been proposed. This paper reports the details of the validated aeroengine fan noise test method and the wind tunnel test results for the validation. The experimental set-up consists of a transition duct to the open jet, a mode synthesizer to generate different modes of characteristic fan noise, and a sensor array to conduct mode detection in the presence of background flow speeds and background noise interference. The main attention is primarily focused on the examination of the associated reconstruction accuracy and probability of success for spinning mode detection. The testing results clearly show the potential capability of the proposed new testing method for aeroengine tests in a practical testing facility.

Sign in / Sign up

Export Citation Format

Share Document