摘要
在声屏障声学设计和测量规范的基础上,分析公路交通线声源对受声点声级的影响,提出线声源有效长度的概念。综合考虑位置,高度,长度等因素对声屏障降噪性及经济性的影响,建立以经济性为目标函数,降噪要求为约束条件的数学模型,运用MATLAB软件进行优化设计。根据公路交通噪声1/3倍频程谱分析插入损失,使结果更精确。通过算例对比,验证考虑线声源有效长度的优化方案在经济性和降噪性方面的优越性。
Based on the specifications of survey and design of noise barriers,the effects of the linear acoustic source of highway traffic on the noise level at the barrier are analyzed.The concept of effective length of linear sound source is proposed.Considering the impact of its position,height and length on the cost and noise reduction effect of the sound barrier,a mathematical model is set up with the cost of the noise barrier as an objective function and noise reduction as acoustic constrains.The MATLAB software is used for optimal design.The third-octave band of a representative spectrum is used to calculate the insertion loss,which makes the result more accurate.This method of design,considering the effective length of linear sound source,is proved to be superior in the aspects of economy and noise reduction.
出处
《噪声与振动控制》
CSCD
北大核心
2011年第1期153-156,共4页
Noise and Vibration Control
基金
国家自然科学基金(0672107)
关键词
声学
交通噪声
插入损失
优化
噪声衰减
有效长度
acoustics
traffic noise
insertion reduction
optimization
noise reduction
effective length
