Modeling aerodynamically generated sound - Recent advances in rotor noise prediction

2000 ◽  
Author(s):  
Kenneth Brentner
Keyword(s):  
Noise Prediction ◽  
Rotor Noise ◽  
Recent Advances

Advanced open rotor noise prediction

2014 ◽  
Vol 118 (1208) ◽  
pp. 1125-1135 ◽  
Author(s):  
M. J. Kingan
Keyword(s):  
High Speed ◽  
Broadband Noise ◽  
Current Status ◽  
Prediction Methods ◽  
Noise Prediction ◽  
Acoustic Data ◽  
Rotor Noise ◽  
Future Challenges ◽  
Open Rotor ◽  
Development And Validation

Abstract The purpose of this paper is to describe the current status of open rotor noise prediction methods and to highlight future challenges in this area. A number of analytic and numerical methods are described which can be used for predicting ‘isolated’ and ‘installed’ open rotor tonal noise. Broadband noise prediction methods are also described and it is noted that further development and validation of the current models is required. The paper concludes with a discussion of the analytical methods which are used to assess the acoustic data collected during the high-speed wind-tunnel testing of a model scale advanced open rotor rig.

Broadband Rotor Noise Prediction Based on a New Frequency-Domain Foumulation

2010 ◽  
Vol 22 (3) ◽  
pp. 387-392
Author(s):  
Jian-bo Xie ◽  
Qi-dou Zhou ◽  
Bin Fang
Keyword(s):  
Frequency Domain ◽  
Noise Prediction ◽  
Rotor Noise

Application of parabolic blending for the estimation of thickness distribution in thermoformed products

2020 ◽  
pp. 009524432095980
Author(s):  
Olcay Ekşi ◽  
Hakan Üstünel
Keyword(s):  
Experimental Method ◽  
Thickness Distribution ◽  
Experimental Results ◽  
Noise Prediction ◽  
Research Fields ◽  
Rotor Noise ◽  
Thickness Prediction

The Parabolic Blending (PB) technique has been widely used in various research fields, such as rotor noise prediction, over the last few decades. However, in the literature, PB is not utilised for the thickness prediction of thermoformed products. In this study, Polystyrene (PS) sheets of various thicknesses were thermoformed using a lab-scale thermoforming machine. Firstly, thickness distributions in thermoformed PS products were obtained by the experimental method. Then, PB was used to estimate the thickness distribution of conical semi-finished thermoformed parts. The obtained results were then compared with the ones obtained experimentally. A comparison reveals that the use of PB provides more accurate thickness values than the experimental results. As a result, PB can be utilised for the prediction of thickness distribution in thermoformed products which have been formed by the same mould.

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