Description

In this study, a comprehensive acoustic simulation of a quadcopter was performed using ANSYS Fluent, a powerful computational fluid dynamics (CFD) software. The primary objective was to investigate the noise generated by the quadcopter during FPV operation and to gain insights into its acoustic characteristics.

The quadcopter geometry was designed using SpaceClaim, a 3D modeling software integrated with ANSYS. Leveraging the symmetry of the quadcopter, a 3D symmetric model was created, which significantly reduced the computational cost while maintaining the accuracy of the simulation. The designed geometry captured the essential features of the quadcopter, including the main body, rotors, and other relevant components.

Once the geometry was finalized, it was imported into ANSYS Meshing for discretization. The meshing process involved dividing the computational domain into smaller elements, creating a mesh that accurately represented the quadcopter’s geometry. Care was taken to ensure that the mesh quality was high, with appropriate refinement in regions of interest, such as near the rotors and the quadcopter body.

The acoustic simulation of the quadcopter using ANSYS Fluent demonstrated the effectiveness of CFD in studying the noise characteristics of complex systems. The 3D symmetric model and the high-quality mesh ensured accurate and efficient simulations. The results obtained from this study can be used to optimize the quadcopter design, minimize noise emissions, and enhance the overall acoustic performance of the system.

you can Also visit Quadcopter FSI and Dynamic Stability Derivatives Analyses.

Methodology

we employ ANSYS Fluent software and leverage the applications of Computational Fluid Dynamics (CFD)  to absorb the sound level around the domain and generate sound by the propeller. In this simulation, To capture the rotational motion of the quadcopter blades with an angular velocity of 1200 RPM, we employed two mesh motion zones. These zones allowed for accurate simulation of the blade dynamics and airflow characteristics around the quadcopter.

Results

Acoustic performance is essential in quadrotors, as it can impact the system's safety and efficiency. Excessive noise can be a safety hazard, as it can interfere with communication between the pilot and ground crew and disturb wildlife in the surrounding area.

In addition, noise can indicate inefficiencies in the system, such as unbalanced rotors or aerodynamic issues. By optimizing the acoustic performance of quadrotors, designers can improve their safety, efficiency, and overall performance. This can lead to more reliable and effective use of quadrotors in various applications, from aerial photography to search and rescue operations.

Turbulence can have a significant effect on the sound generation of a propeller. As the airflow around the propeller becomes more turbulent, it can cause pressure and velocity fluctuations, leading to increased noise levels.

This can be especially pronounced in the near-field region of the propeller, where the turbulent flow can interact with the blades and ring structure. Designers of propellers must take turbulence into account when optimizing their acoustic performance.