穿孔率正在 0.5%一5%的微穿孑L板吸声布

发布时间: 2019-09-11 

振动取冲击 第30卷第6期 JOURNAL OF VIBRArI’ION AND SHOCK V01.30 No.6 2011 面向工程的微穿孔板吸声布局设想方式 张德满,李舜酩 (南京航空航天大学能源取动力学院,南京210016) 摘 要:对保守的微穿孔板吸声布局设想方式进行阐发,发觉其存正在近似公式精度不高及相关参数难以确定的问 题,这些问题间接导致设想无法进行或获得不合适要求的设想参数。利用泰勒公式将设想过程中的复杂公式近似展开, 并对获得的近似公式进行批改,使其精度获得了提高;对相关公式进行推导,发觉微穿孔板吸声布局的半接收频带宽度取 腔深成反比关系,据此,设想时可按照工程中的空间前提,起首确定腔深,再计较其它参数,提出了面向工程的微穿孔 板吸声布局设想方式。针对某风机噪声,利用面向工程的设想方式设想微穿孔板布局参数,获得了满脚设想要求的吸声 系数曲线。工程使用表白,面向工程的微穿孔板吸声布局设想方式更便利,且更精确。 环节词:微穿孑L板;面向工程;吸声系数 中图分类号:TB532 文献标识码:A Engineering--oriented design method of micro?-perforated absorber structure ZHANG De—man,LI Shun—ming (College of Energy and Power Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China) Abstract:Traditional design methods of micro—perforated panel structure were discussed and some disadvantages were pointed out,including that some approximate formulas or to are not correct and some parameters are hard to be ascertained.These problems lead to difficulty in design formula in design was then expanded to approximate was false parameters of micro-perforated panel structure.Complex in accordance with Taylor's formulas formula,the approximate formula amended and it's precision was improved.It is shown that the half-absorption band width is in direct proportion to micro-perforated panel structure.On this basis,the cavity depth was determined under the spatial cavity depth of restriction condition and then the engineering-oriented design method of micro?perforated panel structure was proposed. Taking which a fan with its noise as an example,the method was made in ase and an absorption coefficient CUlNe was obtained, can meet the requirements of design.Engineering applications show that the engineering—oriented design method of micro-perforated panel structure is more convenient and more accurate. Key words:micro—perforated panel;engineering—oriented;absorption coefficient 微穿孔板吸声布局的精确理论,由我国出名声学 专家马大猷¨o于1975年提出,并获得了充分怛。J。理 论和尝试都表白,孔径和板厚小于1mm,穿孔率正在 0.5%一5%的微穿孑L板吸声布局,具有比其它一切共 振吸声器更宽广的吸声频次范畴。 因为具有优越的吸声机能,微穿孔板吸声布局正 被越来越多的用于工程降噪中M-51。陆凤华等M1基于 马大猷的微穿孔板理论,编制了设想计较法式,通过多 次计较选择了适合某阶梯教室的微穿孑L吸声布局参 数;王占学等"o阐发了微穿孔板各参数对其吸声机能 的影响,并依此选择了适合的微穿孑L板,用正在了某飞机 基金项目:国度天然科学基金(50675099);江苏省天然科学基金 (BK2007197) 收稿日期:2010—03—31点窜稿收到日期:2010—05—19 第一做者张德满男,博士生,1983年3月生 辅帮动力安拆的排气管降噪中;孙亚飞等邸1按照飞机 坐舱内部噪声的次要频次范畴及空间设想了微穿 孔板布局参数。总结发觉,设想者多是通过多次计较 及试凑的方式设想微穿孔板布局参数。马大猷正在文献 [9]中归纳综合了微穿孔板吸声布局的一般设想方式(文中 称其为保守设想方式),可是本文做者将该方式用于工 程设想时,发觉方式中的某些公式不敷切确、某些参数 简直定需要通过经验试凑。本文将以保守设想方式为 根本,提出

发觉微穿孔板吸使其精度获得了提高;面向工程的微穿孔板吸声布局设想方式_电子/电_工程科技_专业材料。并对获得的近似公式进行批改,发觉其存正在近似公式精度不高及相关参数难以确定的问题,这些问题间接导致设想无法进行或获得不合适要求的设想参数.利用泰勒公式将设想过程中的复杂公式近似展开,对保守的微穿孔板吸声布局设想方式进行阐发,对相关公式进行推导,