A vector intensity-based equivalent wavepacket model for high-performance military aircraft jet noise

In this paper, a wavepacket ansatz is used to create an analytical model for the jet noise radiation from a high-performance military aircraft. Unlike other equivalent, acoustics-based wavepacket source models, this one is designed to match the measured acoustic vector intensity at a number of positions in the jet near field for both military power and afterburner engine conditions. The complex pressure of a line source is defined according to an analytical hyperbolic tangent wavepacket model and Rayleigh integration is used to find the pressure, particle velocity, and time-averaged intensity at observer locations. A cost function developed from the modeled and measured acoustic intensity vectors is used in a simulated annealing algorithm to find the optimal wavepacket parameters. Although this source modeling approach neglects some source characteristics, it also provides a relatively simple equivalent source modeling methodology that provides insights into tactical jet noise radiation.