Statistical Analysis of Nonlinearly Propagating Acoustic Noise in a Tube

Utah State University

Acoustic fields radiated from intense, turbulent sound sources such as military jets and rockets are not well understood. In addition to the inherent random nature of the field, the amplitudes of the acoustic vibration are great enough that nonlinear considerations are necessary for modeling. In order to better understand these complex fields, high-amplitude noise in a tube is measured and analyzed. The basics of nonlinear acoustics will be covered briefly in this talk. Additionally, some statistical tools that are useful in analyzing random systems, such as probability density functions and skewness, will be explained. The measured evolution of the skewness of the first time derivative of high-amplitude noise in a tube will be presented.