PVDF压电薄膜新型微穿孔板主动吸声方法的仿真研究  

Simulation of Active Sound Absorption of a New PVDF Micro-Perforated Plate Structure

作　　者：段秀华 王焕钦 钱玉洁 孔德义[1] 

机构地区：[1]中国科学院合肥智能机械研究所传感技术联合国家重点实验室

出　　处：《机械设计与制造》2014年第2期24-27,共4页Machinery Design & Manufacture

基　　金：国家重点基础研究发展项目计划(973计划)(2011CB302104)

摘　　要：普通的单层微穿孔板结构参数固定后,吸声频带有限,多层微穿孔板可以拓宽吸声频带,但增大了吸声体的体积,同时增加了结构的复杂度。为此,提出了一种基于压电薄膜的新型单层微穿孔板结构,该结构利用形变可控的PVDF压电薄膜制作MPP,MPP的结构参数如孔径可以随入射频率的变化实时调节,并且PVDF压电薄膜本身可以作为主动吸声控制的执行器。同时提出了针对该结构的主动吸声方法,即通过跟踪入射频率的变化来控制孔径的微形变使其吸声系数实时最优化。通过对四种典型PVDF-MPP结构的数值仿真,表明该主动吸声方法的有效性,为工程上构建轻薄、高效的吸声体,提供了新思路。The traditional single-layer MPP has a limit sound absorbing band, and multi-layer can expand the bands of absorption, but it increases the volume and complexity of absorber, so a new micro-perforated plate structure was proposed based on the Polyvinylidene fluoride （PVDF） piezoelectric film （named PVDF-MPP）, of which the advantage is piezoelectric thin film that can be used for the actuator of active absorption control. An active control method was proposed based on this structure, by tracking the sound wave frequency＇s variation and controlling the micro-deformation of aperture, to achieve the maximum of the sound absorption coefficient in time. The simulation results to the four typical PVDF-MPP structures showed the validity of the control method, which can provide a new strategy to make a thinner and more efficient sound absorber.

关 键 词：PVDF压电薄膜 微穿孔板 孔径 吸声系数 主动吸声 

分 类 号：TH16[机械工程—机械制造及自动化]