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A 3 bladed rotor is designed, as an example, based on the vibratory hub load reduction optimization process with swept tip angle and composite material.
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Using the aeroelastic analysis, response surface approximations are constructed for the objective function (vibratory hub loads).
9%-33% reduction of 3/rev hub loads in comparison with the base-line rotor.
The objective of the improved design is to minimise the vibratory hub loads.
The objective function, which includes vibratory hub loads and active flap control inputs, was minimized by an optimal control process.
Compared to the starting design of the propeller, the optimum solution results in a 49.6 70.6% reduction of the 7/rev hub loads.
The nonlinear periodic transient responses and vibration hub loads of the composite blade are obtained by solving coupled equations using the Newton Raphson numerical procedure.
Numerical results of the steady blade and flap deflections as well as the vibratory hub loads were also presented for various advance ratios and were compared with previously published analysis results obtained from modal analyses based on a moderate deflection-type beam theory.
Smartphones are well-established social hubs, loaded with software used to send and receive photographs, appointments, news and invites.
For blade hub, more loading in posterior area should be chosen, while for blade tip more loading in frontal area of the blade is available.
The rotor hub vibratory loads is chosen as the objective function, while rotor blade section construction parameter, composite material ply structure and blade tip swept angle as the design variables, and autorotation inertia, natural frequency and aeroelastic stability as the constraints.
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