Adjoint-based sound reinforcement in the time domain
* Presenting author
Sound Reinforcement aims at synthesizing homogeneous sound fieldsfor the entire audio bandwidth using Line Source Arrays. These arraysconsist of electronically controlled loudspeaker cabinets with different tilt angles. The determination of the optimal geometric arrangement and electronic drive is an ill-posed inverse problem. Recently, the authors presented a novel adjoint-based approach which lives in the time domain as an alternative solution method to corresponding problems. We optimize acoustic sources to match a target sound field subject to an objective function. For that, we solve the Euler equations and the corresponding adjoint by means of computational aeroacoustic techniques. The method can determine appropriate driving functions and appropriate positions of the sources for the synthesis of the desired sound field. We will present validation examples including base flows, e.g. wind, and thermal stratification for a representative loudspeaker setup. It will be shown that the method provides reasonable driving functions also for these conditions.