Aiming to improve the comprehensive aerodynamic performance of a high-speed train, multi-objective shape optimization method for streamlined train head is proposed in this work. The parameterized with some spline curves. design variables are uniformly sampled using optimal Latin hypercube method. resistance and dipole noise sources chosen as objectives, which can be obtained through computation...

Reducing rotor aerodynamic noise is an important challenge in helicopter design. Active flap control (AFC) on rotors effective reduction method. It changes the segment airfoil shape, load distribution, and wake path of flow by adding trailing edge flaps (TEFs). Although AFC easily simulated, relevant experiments have not been widely conducted due to test technical problems limited financial sup...

A study of the combined helicopter noise and vibration problem was conducted. A refined aerodynamic model capable of calculating the unsteady surface pressure distribution on rotor blade/flap combinations is developed and coupled with an aeroelastic analysis simulation code. An acoustic prediction tool based on WOPWOP is combined with the aeroelastic analysis based on a flexible blade with coup...