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    Passive Rotor Noise Reduction Through Axial and Angular Blade Spacing Modulation by Chingiz Arystanbekov, Altay Zhakatayev, Basman Elhadidi

    Published 2025-02-01
    “…Additionally, the study accounts for the effect of the blade tip Mach number, concluding that a tip Mach number ranging between <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>0.7</mn></mrow></semantics></math></inline-formula> and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>0.9</mn></mrow></semantics></math></inline-formula> is optimal for noise reduction in the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mn>30</mn><mo>∘</mo></msup></semantics></math></inline-formula> configuration. …”
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