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为探讨加筋对双层结构低频隔声及有源控制的影响,分析了筋条数目及布放位置对双层加筋结构低频隔声性能、有源控制策略选取及有源隔声性能的影响。首先利用模态叠加与声-振耦合理论对双层加筋结构建模,然后采用数值算例对上述问题展开探讨。研究发现,筋条数目增多或筋条靠近基板的中间位置布放,将有利于双层加筋结构低频隔声性能的提高。对于有源控制措施,声控制策略与力控制策略相比,前者的控制效率较高且降噪效果较好。由于筋复杂的耦合影响,添加多条筋或筋条靠基板中间布置时有源控制效果减弱,需施加多个点源才能获得较好的降噪效果。
In order to discuss the influence of stiffener on the low frequency sound insulation and active control of double-deck structure, the influences of the number of stiffeners and laying position on low-frequency sound insulation performance, selection of active control strategy and active sound insulation performance of double-stiffened structure influences. Firstly, the double-layer stiffened structure is modeled by modal superposition and acoustic-vibration coupling theory, and then the numerical examples are used to discuss the above problems. It is found that the increase of the number of ribs or the placement of ribs close to the middle of the substrate will be conducive to the improvement of low-frequency sound insulation performance of the double-stiffened structure. For the active control measures, compared with the force control strategy, the former has higher control efficiency and better noise reduction effect. Due to the complex coupling effect of the tendons, adding more ribs or ribs reduces the effectiveness of the active control when arranged in the middle of the substrate, and more point sources need to be applied to obtain a better noise reduction effect.