Results 41 to 50 of about 4,706 (230)

Survey of Semi-Empirical Jet Noise Models for Preliminary Aircraft Engine Design

Aerospace, 2023
Scientific research studies on jet noise generation have been ongoing since the early 1950s, when turbojets were first used in commercial aircraft. Several numerical methods have been developed with the aim of reducing the environmental issues related to
Francesco Petrosino, Mattia Barbarino
doaj   +1 more source

Tutorial Overview: Numerical Synergy in Muffler Acoustic Design A Critical Comparison of TMM, FEM, and CFD Approaches for Transmission Loss Quantification

Engineering Reports, Volume 8, Issue 1, January 2026.
Experimental measurements reveal distinct performance boundaries: TMM achieves rapid convergence (< 2 dB error below 2000 Hz) but neglects 3D wave effects; FEA maintains < 10% deviation up to 3500 Hz with 90% reduced computational cost versus CFD; while transient CFD captures broadband attenuation trends despite 10× higher resource demands.
Bin Fang, Tong Wei, Yi Yang, Xintie Wang
wiley   +1 more source

Control of aerodynamic noise with feedback loop around the trailing edge of a curved plate with a kink shape by a plasma actuator

Nihon Kikai Gakkai ronbunshu, 2018
Intense sound is radiated due to aeroacoustic feedback loop from a flow around the trailing edge of a curved plate with a kink shape such as a bonnet of an automobile.
Takenori MIYAMOTO, Hiroshi YOKOYAMA, Akiyoshi IIDA   +2 more
doaj   +1 more source

The Technique of MIEELDLD in Computational Aeroacoustics [PDF]

Journal of Applied Mathematics, 2012
The numerical simulation of aeroacoustic phenomena requires high‐order accurate numerical schemes with low dispersion and low dissipation errors. A technique has recently been devised in a Computational Fluid Dynamics framework which enables optimal parameters to be chosen so as to better control the grade and balance of dispersion and dissipation in ...
openaire   +5 more sources

Enhancing Energy Generation While Mitigating Noise Emissions in Wind Turbines Through Multi‐Objective Optimization: A Deep Reinforcement Learning Approach

Wind Energy, Volume 28, Issue 8, August 2025.
ABSTRACT We develop a torque‐pitch control framework using deep reinforcement learning for wind turbines to optimize the generation of wind turbine energy while minimizing operational noise. We employ a double deep Q‐learning, coupled to a blade element momentum solver, to enable precise control over wind turbine parameters.
Martín Frutos, Oscar A. Marino, David Huergo, Esteban Ferrer   +3 more
wiley   +1 more source

A Dilating Vortex Particle Method for Compressible Flow with Applications to Aeroacoustics [PDF]

, 2002
Vortex methods have become useful tools for the computation of incompressible fluid flow. In the present work, a vortex particle method for the simulation of unsteady two-dimensional compressible flow is developed and applied to several problems.
Eldredge, Jeffrey D.
core   +1 more source

Linearized Euler Equations for the Determination of Scattering Matrices for Orifice and Perforated Plate Configurations in the High Mach Number Regime

Aerospace, 2016
The interaction of a plane acoustic wave and a sheared flow is numerically investigated for simple orifice and perforated plate configurations in an isolated, non-resonant environment for Mach numbers up to choked conditions in the holes.
Moritz Schulze, Michael Wagner, Thomas Sattelmayer   +2 more
doaj   +1 more source

State of the Art of Low‐Frequency Acoustic Modulation: Intensity Enhancement and Directional Control

Advanced Science, Volume 12, Issue 27, July 17, 2025.
High intensity low‐frequency sound sources hold significant value in many fields. However, their long wavelength, strong penetrability, and tendency to diffract make direction control and intensity enhancement challenging. Acoustic generators and metamaterial‐based acoustic devices still face issues such as low energy efficiency, poor directional ...
Jingsong Xu, Yunfeng Ye, Tao Dong, Zhaochu Yang, Nuno Miguel Matos Pires, Yu Zhou, Fuyu Tao, Jin Wang, Junshan Zhang, Guoxi Luo, Libo Zhao, Qi Mao, Yangtao Wang, Zhuangde Jiang   +13 more
wiley   +1 more source

Aerodynamic Performance Investigation of a Biomimetic‐Based Small‐Scale Horizontal‐Axis Wind Turbine: An Experimental Analysis

Wind Energy, Volume 28, Issue 7, July 2025.
ABSTRACT As the demand for power increases, installing small‐scale wind turbines can be an alternative solution. However, the main challenge for their implementation is the aerodynamic noise. With a view to minimizing noise, this study focuses on the performance investigation of a small‐scale horizontal‐axis wind turbine with NACA 4412 blades inspired ...
Hasan Muhommod Robin, Mim Mashrur Ahmed, Md. Rabiul Islam Sarker, Md. Nahid Hasan, Mahadi Hasan Masud   +4 more
wiley   +1 more source

Microcylinder and Slot Combination for Flow Separation Control Over a Wind Turbine Airfoil

Wind Energy, Volume 28, Issue 7, July 2025.
ABSTRACT This study explores a novel passive flow control strategy combining a microcylinder and slot configuration to mitigate flow separation over an S809 wind turbine airfoil under stall conditions at a Reynolds number of 106. Numerical simulations are conducted using the Reynolds‐averaged Navier–Stokes (RANS) approach. The primary objectives are to
Sami Bouterra, Riyadh Belamadi, Abdelouaheb Djemili, Adrian Ilinca   +3 more
wiley   +1 more source