Weikang Jiang (Professor of Eng., Deputy director, State Key Lab of Mechanical System and Vibration Institute of Vibration, Shock & Noise, Shanghai Jiao Tong University) - Séminaire du LVA

Visualization of sound field radiated from non-stationary sources

Acoustic imaging technique plays a role to visualize the
acoustic field. A brief overview of the classic imaging techniques and its
application, such as nearfield acoustic holography (NAH) for stationary and
cyclostationary source, are prepared. Then, NAH for transient source is
presented. A semi-free transient sound field is considered into NAH, in
which the half-space interpolated time-domain equivalent source method
(ITDESM) are presented for the purpose of modeling the transient sound
propagation under different reflection conditions. That breakthrough the
limitation of free-field application of conventional ITDESM.