夹层边界上布置主动声学边界的有源隔声双层板结构

发布时间：2018-07-02 11:11

本文选题：主动声学边界方法 + 声弹性理论　；参考：《振动与冲击》2017年21期

【摘要】：在双层板结构中夹层声场边界上布置平面声源作为主动声学边界,构成有源隔声双层板结构,提出基于主动声学边界方法的有源隔声双层板结构。在双层板结构中夹层边界上布置四边简支板,用来代替主动声学边界,控制力作用到该简支板上,采用声弹性理论建立了有源隔声双层板结构的计算模型,分别以辐射声功率最小和夹层声功率最小作为控制目标来优化控制力,计算分析控制前后夹层结构的传声损失以及各子系统的响应,并研究了主动声边界尺寸大小对系统隔声性能的影响。计算结果表明:主动声边界控制策略可以有效提高双层板结构的隔声性能,且以辐射声功率最小为控制目标要优于以夹层声场的声功率最小为控制目标;控制后,主动声边界对入射板振动响应几乎没有影响,辐射面板的振动动能和夹层声场的声功率均被有效地抑制;不同尺寸主动声边界都提高了夹层结构的隔声性能;对于低频率段,不同尺寸主动声边界对夹层结构的隔声性能提高的程度相同;对于其他频率段,主动声边界对传声损失和各子系统响应的影响并没有一定的规律,可以对主动声边界的尺寸进行优化设计,达到提高特定频段隔声性能的目的。
[Abstract]:Plane sound sources are arranged on the boundary of sandwich sound field as active acoustic boundary to form the active sound insulation double-layer plate structure. An active acoustic double-layer plate structure based on active acoustic boundary method is proposed. Four side simply supported plates are arranged on the sandwich boundary in the double layer plate structure, which is used to replace the active acoustic boundary. The control force is applied to the simple supported plate. The calculation model of the active sound insulation double layer plate structure is established by using the theory of acoustic elasticity. The minimum radiation sound power and the minimum interlayer sound power are respectively taken as the control targets to optimize the control force, and the sound transmission loss of the sandwich structure and the response of the subsystems before and after the control are calculated and analyzed. The influence of the size of active acoustic boundary on the sound insulation performance of the system is also studied. The calculation results show that the active acoustic boundary control strategy can effectively improve the sound insulation performance of the double-layer structure, and the minimum radiation sound power is better than the minimum sound power of the sandwich sound field. The active acoustic boundary has little effect on the vibration response of the incident plate, the vibration kinetic energy of the radiation panel and the sound power of the interlayer sound field are effectively suppressed; the active acoustic boundary of different sizes improves the sound insulation performance of the sandwich structure; for the low frequency band, For other frequencies, the influence of active acoustic boundary on sound transmission loss and response of each subsystem is not regular. The size of active acoustic boundary can be optimized to improve the performance of acoustic insulation in specific frequency band.
【作者单位】：南京航空航天大学机械结构力学及控制国家重点实验室;中国工程物理研究院总体工程研究所;
【基金】：江苏省普通高校研究生科研创新计划资助项目(CXZZ13_0147) 2015年度省产学研前瞻联合研究项目(BY2015003-01) 机械结构力学及控制国家重点实验室(南京航空航天大学)自主研究课题资助(0515G01) 国家自然基金(11172131;11232007) 中央高校基本科研业务费专项资金资助江苏高校优势学科建设工程资助项目
【分类号】：TB535

【相似文献】