结构参数对共振式消声器共振频率影响的修正  

Correction on Resonance Frequency of Resonant Silencer Having Different Structural Parameters

作　　者：曹倩倩[1] 李舜酩[1] 胡伊贤[1] 王勇[1] 

机构地区：[1]南京航空航天大学能源与动力学院,江苏南京210016

出　　处：《机械设计与制造》2014年第5期56-59,共4页Machinery Design & Manufacture

摘　　要：由于古典集中参数频率计算公式存在估算精度较低的问题,针对共振式消声器共振频率古典集中参数计算公式,以三维有限元软件计算结果为基础,提出了新的连接管长度修正公式,将共振频率预测误差降低在3%以内,解决了精度较低的问题。针对某发动机排气噪声超出企业标准限值,运用流体和声学有限元仿真分析的方法,结合台架试验并综合使用共振式消声器共振频率修正公式,对复杂排气消声器进行分析与改进,取得了良好的改进效果,验证了新的修正公式能够满足工程实际需要。Since the estimation precision of classical lumped parameter frequency calculation formula is low, it aiming for the lumped-parameter calculation formula of the resonance frequency, with three dimensional finite element methods, a new connection tube length correction formula is put forward; the resonance frequency of the prediction error is reduced to less than 3%. By the ncw formula, the classical lumped parameter frequency calculation formula estimating low precision problem is solved. For exhaust noise exceeding the national standard limits, with the resonance muffler resonance frequency correction formula and bench test, by using CFD and acoustic finite element method, the acoustic pe^orrnance of exhaust muffler was analyzed and optimized. Good improvements is achieved, meantime the new correction formula is validated.

关 键 词：共振式消声器 共振频率 结构参数 声学性能 

分 类 号：TH16[机械工程—机械制造及自动化] TB535.2[理学—物理]