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| Title: | Effects of two DOF lining tolerances on modeled inlet acoustic attenuation |
| Author (s): | Burd, David R. Eversman, Walter Gallman, Judith Drouin, Mary |
| Department/Lab Affiliations: | Mechanical & Aerospace Engineering |
| Keywords: | acoustic linings freedom linings lining models manufacturing tolerances |
| Issue Date: | 2009-05 |
| Publisher: | American Institute of Aeronautics and Astronautics AIAA |
| Citation: | Burd, David R., Walter Eversman, Judith Gallman, and Mary Drouin. “Effects of Two DOF Lining Tolerances on Modeled Inlet Acoustic Attenuation”, 15th AIAA/CEAS Aeroacoustics Conference (30th AIAA Aeroacoustics Conference), May 2009, AIAA 2009-3109. |
| Abstract: | The effect of manufacturing tolerances on realized attenuation for two degree of freedom linings is investigated with the use of lining models and finite element duct propagation codes. Acoustic linings are created for a small turbofan engine that optimizes attenuation at takeoff/sideline and approach conditions. Lining physical and geometric parameters are set which best meet the optimum impedance requirements at two target frequencies. Variations of these parameters representing realistic manufacturing tolerances are used to systematically examine the effect on installed impedance and predicted attenuation. Attenuation at sideline and approach conditions is found to sensitive to manufacturing tolerances around optimum conditions. It is found that local lining impedance variation due to local Sound Pressure Level also has a significant effect on realized attenuation in the sideline case. The results of the study are case dependent; however the analysis scheme presented provides a method for cost-benefit analysis of maintaining tight tolerances on manufacturing processes. |
| Type: | Article - Conference proceedings text |
| In Title: | 15th AIAA/CEAS Aeroacoustics Conference |
| Copyright Notice: | This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder. Pre-print: archiving status unclear; Post-print: author cannot archive; FULL COPYRIGHT INFORMATION: |
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| title | Effects of two DOF lining tolerances on modeled inlet acoustic attenuation |
| contributor.author | Burd, David R. |
| contributor.author | Eversman, Walter |
| contributor.author | Gallman, Judith |
| contributor.author | Drouin, Mary |
| contributor.deptlab | Mechanical & Aerospace Engineering |
| subject | acoustic linings |
| subject | freedom linings |
| subject | lining models |
| subject | manufacturing tolerances |
| date.issued | 2009-05 |
| publisher | American Institute of Aeronautics and Astronautics AIAA |
| identifier.citation | Burd, David R., Walter Eversman, Judith Gallman, and Mary Drouin. “Effects of Two DOF Lining Tolerances on Modeled Inlet Acoustic Attenuation”, 15th AIAA/CEAS Aeroacoustics Conference (30th AIAA Aeroacoustics Conference), May 2009, AIAA 2009-3109. |
| identifier.pub.URI | |
| description.abstract | The effect of manufacturing tolerances on realized attenuation for two degree of freedom linings is investigated with the use of lining models and finite element duct propagation codes. Acoustic linings are created for a small turbofan engine that optimizes attenuation at takeoff/sideline and approach conditions. Lining physical and geometric parameters are set which best meet the optimum impedance requirements at two target frequencies. Variations of these parameters representing realistic manufacturing tolerances are used to systematically examine the effect on installed impedance and predicted attenuation. Attenuation at sideline and approach conditions is found to sensitive to manufacturing tolerances around optimum conditions. It is found that local lining impedance variation due to local Sound Pressure Level also has a significant effect on realized attenuation in the sideline case. The results of the study are case dependent; however the analysis scheme presented provides a method for cost-benefit analysis of maintaining tight tolerances on manufacturing processes. |
| type | Article - Conference proceedings |
| type.DCMIType | text |
| relation.isPartOf | 15th AIAA/CEAS Aeroacoustics Conference |
| rights | This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder. |
| rights | Pre-print: archiving status unclear; Post-print: author cannot archive; |
| rights.URI | |
| identifier.persist.URI | |
| date.available | 2009-06-19T13:07:48Z |