中文摘要：

三层有源隔声结构中次级平面声源的布放影响系统的隔声性能,平面声源位置的优化需重点研究。应用遗传算法在宽频带内对三层结构中平面声源的位置进行优化设计。首先对三层板腔结构建模并求解振动响应,然后分别以被动隔声、有源降噪及系统总隔声性能为依据,构建宽频带优化函数;最后通过迭代计算获得最优的布放位置。结果表明,对于被动隔声最优的平面声源布放位置应位于双层结构的中间;而对有源降噪,次级声源应尽量靠近入射板布放。对于系统总的隔声性能,最优的布放位置应在上述两者之间取折中。

英文摘要：

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.