Active structural acoustic control of thin plate with mixed boundary conditions

摘要

The paper deals with active structural acoustic control of the experimental mock-up (baffled thin plate with mixed boundary conditions). The aim of the experiment is to globally reduce radiated sound pressure level by actions of distributed forces and line moments used as secondary actuators. Single and double channel feedforward control configurations are studied and compared. Method of variable (actively controlled) boundary condition is tested. Normal velocity distribution on the plate surface is measured by laser scanning vibrometer and used to calculate structural intensity and radiated sound field. According to these results positions of secondary actuators and error microphones are optimized. The structural intensity flow is studied during active control with regard to the system configuration.