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- W2051363107 abstract "Theoretical and computational studies of rotor-tip sound radiation have been conducted for the purpose of designing rotor tips that radiate less sound in specified frequency bands. Consideration is given to radiation due to lift and thickness effects. Effects of unsteady vortex shedding on lift radiation are examined. It is shown that lift radiation is generally negligible in comparison with thickness radiation. A computational algorithm is developed for the synthesis of tip shapes that cause minimum thickness radiation in specified frequency bands. Numerical results are obtained for tip shapes that minimize high-frequency radiation, and a substantial reduction of radiation in comparison with existing shapes is shown. The uncertainty principle is used to establish a fundamental relationship between the tip section chord length and the minimum possible cutoff frequency for effective suppression of high-frequency sound. Factors that affect tradeoffs between choices on airfoil section and planform are discussed." @default.
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- W2051363107 date "1973-02-01" @default.
- W2051363107 modified "2023-09-26" @default.
- W2051363107 title "Synthesis of helicopter rotor tips for less noise" @default.
- W2051363107 doi "https://doi.org/10.1121/1.1913365" @default.
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