In this study, asymptotic analysis of the frequency-domain formulation to compute the tonal
noise of the small rotors in the now ubiquitously multi-rotor powered drones is conducted …

Green's functions for acoustic problems is the fundamental solution to the inhomogeneous
Helmholtz equation for a point source, which satisfies specific boundary conditions. It is very …

Experimental and numerical studies were conducted to investigate passive control of a
forward-curved centrifugal fan noise by employing the open-cell metal foam (OCMF). The …

In this paper, an acoustic pressure gradient formula capable of accounting for constant
uniform flow effects is suggested. Acoustic pressure gradient calculation is key for acoustic …

In this paper, high-speed impulsive noise radiated from helicopter rotors in hover and
forward flight is computed by using a convected FW-H equation in the frequency domain …

Acoustic and vortical disturbances in uniform mean flow bounded with solid surfaces are
investigated in this paper. A convective vector wave equation and a convection equation that …

A new approach to accelerating the evaluation of monopole and dipole source integrals via
the fast multipole method (FMM) in the time domain for general three-dimensional (3-D) …

Visualization of acoustic pressure and acoustic velocity field and computation of acoustic
power are meaningful to investigate noise radiation and propagation mechanism of …

An analytical acoustic vector formulation is meaningful to visualize acoustic energy radiating
from sources and to predict sound scattered by surfaces. This paper presents a vector wave …

This paper presents a convective time-domain equivalent-source method for determining the
scattered acoustic pressure field in a uniform moving medium. The proposed method is …