Optimizing location of secondary planar sound source of active three-panel sound insulation structure

The location of the secondary planar source of an active three-panel sound insulation structure affects its sound insulation performance. We use the genetic algorithm to optimize the location of the secondary planar sound source in a wide frequency band. First, we establish the model of the three-panel sound insulation structure by using the vibro-acoustic coupling method and solve its vibration response. Second, based on the passive sound insulation, active noise reduction and total sound insulation performance of the sound insulation structure, we establish the wide frequency band optimization function. Finally, we obtain the optimal locations of the secondary planar sound source with the iterative calculation of the genetic algorithm. The simulation results, given in Figs.2 through 9, and their analysis show preliminarily that: (1) for the best passive sound insulation performance, the optimal location of the secondary planar sound source should lie in the middle of the double-panel sound insulation structure; (2) for the active noise reduction, the secondary planar sound source should be located as close to the incident panel as possible; (3) for the total sound insulation performance that considers both active and passive sound insulation performance, the optimal location should be a compromise between the abovementioned two optimal locations.