Aerodynamic noise

In this study, we investigated the influence of blade shapes on the aerodynamic noise characteristics of helicopter main rotors by the vortex method. The obtained results are the variation of the time-dependent lift coefficient of rotors and the aerodynamic noise characteristics of the helicopter rotor with different blade shapes.

15p vibego 02-02-2024 6 2   Download

This article presents an approach to build and verify a tool for calculating aerodynamic noise characteristics of helicopter rotors. The calculation tool is built on the basis of combining the vortex lattice method and the Formulation 1A of Farrasat, which is one of solutions of the Ffowcs Williams-Hawkings (FW-H) equation.

12p viengels 25-08-2023 3 2   Download

Airflow around the car side mirrors is one of the sensitivity zones in which the airflow is separated and detached from the mirror flat side. The turbulence created by this flow detachment can affect the airflow to the main body of the car which lies behind the mirror.

8p vispyker 16-11-2022 4 2   Download

(BQ) Ebook Automotive engineering: Powertrain, chassis system and vehicle body – Part 1 includes the following content: Section 13 vehicle control systems, section 14 intelligent transport systems, section 15 vehicle modelling, section 16 structural design, section 17 vehicle safety, section 18 materials, section 19 aerodynamics, section 20 refinement, section 22 exterior noise, section 23 instrumentation and telematics.

438p runordie6 10-08-2022 7 2   Download

In this paper, the author proposes a method modified on-line the parameters of the PID controller based on combining the hedge algebras control and model reference system. This proposal has inherited the adaption of hedge algebras control deal with the uncertain systems or nonlinear systems and the sustainability of model reference system for load disturbances and measurement noise.

10p viengland2711 23-07-2019 16 1   Download

This volume, based on the proceedings of the Sixth International Symposium on Unsteady Aerodynamics, Aeroacoustics and Aeroelasticity of Turbomachines and Propellers aims at promoting an international exchange of current research in unsteady flow phenomena in turbomachines and propellers.

604p kennybibo 14-07-2012 74 10   Download