NASA-CR-181851
Evaluation of analysis techniques for low frequency interior noise and vibration of commercial aircraft
Year: 1989
Abstract: The application of selected analysis techniques to low frequency cabin noise associated with advanced propeller engine installations is evaluated. Three design analysis techniques were chosen for evaluation including finite element analysis, statistical energy analysis (SEA), and a power flow method using element of SEA (computer program Propeller Aircraft Interior Noise). An overview of the three procedures is provided. Data from tests of a 727 airplane (modified to accept a propeller engine) were used to compare with predictions. Comparisons of predicted and measured levels at the end of the first year's effort showed reasonable agreement leading to the conclusion that each technique had value for propeller engine noise predictions on large commercial transports. However, variations in agreement were large enough to remain cautious and to lead to recommendations for further work with each technique. Assessment of the second year's results leads to the conclusion that the selected techniques can accurately predict trends and can be useful to a designer, but that absolute level predictions remain unreliable due to complexity of the aircraft structure and low modal densities.
Subject: AIRCRAFT NOISE
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contributor author | NASA - National Aeronautics and Space Administration (NASA) | |
date accessioned | 2017-09-04T18:50:17Z | |
date available | 2017-09-04T18:50:17Z | |
date copyright | 01/01/1989 | |
date issued | 1989 | |
identifier other | KUHOEEAAAAAAAAAA.pdf | |
identifier uri | http://yse.yabesh.ir/std/handle/yse/231698 | |
description abstract | The application of selected analysis techniques to low frequency cabin noise associated with advanced propeller engine installations is evaluated. Three design analysis techniques were chosen for evaluation including finite element analysis, statistical energy analysis (SEA), and a power flow method using element of SEA (computer program Propeller Aircraft Interior Noise). An overview of the three procedures is provided. Data from tests of a 727 airplane (modified to accept a propeller engine) were used to compare with predictions. Comparisons of predicted and measured levels at the end of the first year's effort showed reasonable agreement leading to the conclusion that each technique had value for propeller engine noise predictions on large commercial transports. However, variations in agreement were large enough to remain cautious and to lead to recommendations for further work with each technique. Assessment of the second year's results leads to the conclusion that the selected techniques can accurately predict trends and can be useful to a designer, but that absolute level predictions remain unreliable due to complexity of the aircraft structure and low modal densities. | |
language | English | |
title | NASA-CR-181851 | num |
title | Evaluation of analysis techniques for low frequency interior noise and vibration of commercial aircraft | en |
type | standard | |
page | 78 | |
status | Active | |
tree | NASA - National Aeronautics and Space Administration (NASA):;1989 | |
contenttype | fulltext | |
subject keywords | AIRCRAFT NOISE | |
subject keywords | COMMERCIAL AIRCRAFT | |
subject keywords | ENERGY METHODS | |
subject keywords | ENGINE NOISE | |
subject keywords | FINITE ELEMENT METHOD | |
subject keywords | LOW FREQUENCIES | |
subject keywords | NOISE PREDICTION (AIRCRAFT) | |
subject keywords | PROPELLER NOISE | |
subject keywords | STRUCTURAL VIBRATION | |
subject keywords | TRANSPORT AIRCRAFT | |
subject keywords | VIBRATIONAL SPECTRA |