Designed Reduction of Radiated Noise Characteristics from Two-Bladed General Aviation Propellers
| العنوان: | Designed Reduction of Radiated Noise Characteristics from Two-Bladed General Aviation Propellers |
|---|---|
| المؤلفون: | Stich, Chandra K. |
| تفاصيل مُضافة: | Patrick, H.V.L. advisor Embry-Riddle Aeronautical University. Department of Aerospace Engineering. Howard V. L. Patrick Yechiel Crispin Don Higdon Stich, Chandra K. |
| Call Numbers: | TL671.65 .S753 1999eb |
| وصف مادي: | 1 online resource (xi, 83 leaves) : illustrations (some color) |
| مستخلص: | In recent years increased public awareness has made the reduction of environmental noise pollution a top priority for the aviation industry. Utilizing current technology, this study examines the reduction of noise generated by two bladed general aviation propellers, through design. The Aircraft Noise Prediction Program - Propeller Analysis System (ANOPP-PAS) is used to predict the noise and performance characteristics for an industry typical reference propeller as well as for the final quiet and efficient design. This investigation is based on the use of a 200 hp engine rotating a 76 inch propeller. Typically, such a propeller would be rotated at 2700 rpm; however, the quiet propeller is designed to operate at 2400 rpm. This rotational velocity reduction is incorporated in order to decrease the rotational tip speed thereby preventing the formation of undesirable shocks at the tip. The reference propeller spinning at 2400 rpm achieves a 9 dB reduction in far field OASPL and a 9.6 (14 dBA) reduction in near field OASPL when compared to the reference propeller spinning at 2700 rpm. It should be noted that the values at 2700 rpm are under predicted by 3-10 dB due to a known ANOPP shortfall in shock wave noise prediction. Blade twist distribution, tip shape, airfoil design, and blade sweep were all modified and examined through parametric study to further quiet the design and maintain desirable performance characteristics. These modifications produced additional reduction of 1.1 dB (3.6 dBA) reduction in far-field OASPL. Near-field noise characteristics were reduced by 17 dB (2.3 dBA). The final quiet design is achieved with a 1% increase in performance. |
| الموضوعات: | Noise control., Propellers, Aerial., Aerodynamics., Sound pressure., Bruit Lutte contre., Hélices (Aéronautique), Aérodynamique., Pression acoustique., noise control., aerodynamics., Aerodynamics, Noise control, Propellers, Aerial, Sound pressure |
| مصطلحات الفهرس: | Aerospace Engineering, Aviation |
| URL: | |
| الإتاحة: | Open access content. Open access content |
| ملاحظة: | Also available in print. "Daytona Beach, Florida, Summer 1999." Includes bibliographical references (leaves 81-83). Acknowledgements ; Abstract ; List of tables ; List of figures ; List of symbols -- 1. Introduction. 1.1. Premise for study ; 1.2. Review of literature -- 2. Theory. 2.1. Propeller theory ; 2.2. Propeller noise theory ; 2.3. Noise factors in propeller design -- 3. Analytic methods. 3.1. ANOPP-PAS -- 4. Propeller design. 4.1. Design and analysis ; 4.2. Reference propeller definition ; 4.3. Reference propeller aerodynamic performance ; 4.4. Radiated noise from reference propeller ; 4.5. Tip shape ; 4.6. Propeller rotational speed (2400 vs. 2700 rpm) ; 4.7. In-plane sweep ; 4.8. Out-of-plane sweep ; 4.9. NLF propeller ; 4.10. NLF propeller radiated noise ; 4.11. Optimal propeller radiated noise ; 4.12. Unsteady blade loading -- 5. Conclusions -- 6. Recommendations -- 7. References. |
| أرقام أخرى: | FER oai:commons.erau.edu:db-theses-1273 1014343138 |
| المصدر المساهم: | From OAIster®, provided by the OCLC Cooperative. |
| رقم الأكسشن: | edsoai.on1014343138 |
| قاعدة البيانات: | OAIster |
| الوصف غير متاح. |