汽车驾驶室吸声材料的吸声系数计算方法.pdf

学兔aw. xidi.cm
第50卷第12期
机槭工程学报
Vol50 No 12
2014年6月
JOURNAL OF MECHANICAL ENGINEERING
Jun
2014
DOI:10.3901/JME.2014.12.104
汽车驾驶室吸声材料的吸声系数计算方法
刘刚田12吉晓民
(1.西安理工大学机械与精密仪器工程学院西安710048
2.河南科技大学机电工程学院洛阳471023)
摘要:针对汽车驾驶室吸声材料的吸声系数的一种简便计算方法进行研究。根据吸声材料声阻抗率布置,得到吸声材料流阻
率和孔隙率的计算公式,利用 Matlab循环程序计算出流阻率和孔隙率,根据求得的吸声材料的流阻率和孔隙率,可以理论
计算出汽车驾驶室吸声材料的吸声系数,为理论计算汽车驾驶室吸声材料的吸声系数提供一种简便方法。同时系统研究材料
的吸声系数与吸声材料自身的流阻率、孔隙率和厚度以及入射声波频率的关系,在低频时吸声系数与材料的孔隙率和厚度成
正比;当入射声波在0~500Hz范围内,驾驶室吸声材料的系数随流阻率的减小略有下降,但下降幅度并不显著;随着入射
声波频率的提高,驾驶室吸声材料的吸声系数一般呈上升趋势。
关键词:汽车驾驶室;吸声系数;流阻率;孔隙率
中图分类号:TB53
Method for Calculating Sound Absorption Coefficient of the Sound
Absorbing Materials in the Automobile Cab
LIU Gangti
JX
(1. School of Mechanical and Precision Instrument Engineering, Xi' an University of Technology, Xi'an 710048
2. School of Mechatronics Engineering, Henan University of Science &Technology, Luoyang 471023)
Abstract: A simple method to calculate sound absorption coefficient of the sound absorbing materials of the automobile cab is
proposed. Based on the acoustic impedance arrangement of the sound absorbing materials, the formula for resistivity and porosity
flow of the sound absorbing materials is obtained; then Matlab cycle is used to calculate flow resistivity and porosity, and based on
le obtained figures, sound absorption coefficient of the sound absorbing materials in the automobile cab can be calculated
theoretically; thus providing a simple method for he alculation of sound absorption coefficient of the sound absorbing materials in
the automobile cab in theory. At the same time, the relationship of the sound absorption coefficient of the material, the resistivity
porosity and thickness and incident wave frequency of the sound-absorbing material is studied. Under the low frequency, the sound
absorption coefficient and porosity and thickness is proportional. When the incident sound wave is in the range of0-500 Hz, the
coefficient of the cab sound absorption material decreases sli htly with resistivity but the rate of decline is not significant; with the
increasing frequency of incident sound wave, the sound absorption coefficient of the cab sound-absorbing material generally has an
upward trend
Key words: automobile cab; sound absorbing coefficient; flow resistivity; porosity
统,简称人机系统?。汽车驾驶室最能体现人机工
0前言
程的设计优化,特别是汽车驾驶室的内部噪声不仅
影响乘坐人员的身体健康,而且会降低工作人员的
人机工程学的主要研究对象是人-机-环境系劳动效率,导致驾驶出错率增加,这是各种交通事
故的主要根源。因此对汽车驾驶室内部噪声环境进
国家自然科学基金(51075124)和河南省科技攻关计划(11210221051)资
行人机工程设计显得尤为重要的。汽车驾驶室的噪
助项目。20131012收到初稿,20140411收到修改稿