摘要
传统的隔声测量方法对测试条件及样品本身均要求较高。利用自行开发的LabWindows虚拟仪器测量系统,采用逆滤波器原理,对扬声器频响在高低频分别进行了补偿,得到了波形较为完美的Butter-worth宽频脉冲。在半消声室环境内,利用其作为入射波对铝板的隔声量进行了测试,测试结果表明,在200～5000 Hz的频率范围内,隔声测试结果和理论值吻合较好,平均偏差较小,最大偏差仅为1.2 dB,实现了非隔声室条件下大面积样品的测试,值得工程应用和推广。
The conventional measurement methods on sound transmission loss heed a high requirement on measuring conditions as well as the sample.The self-developed LabWindows measuring system was utilized to emit the broadband Butterworth pulse with the characteristics of good waveform,during which the inverse filter principle was adopted to compensate the loudspeaker frequency response at high and low frequency band.The sound insulation measurement on aluminum plate was conducted in semi free-field room.The results show that the measurement has a good agreement with the theoretical solutions between 200 Hz and 5000 Hz,the maximum deviation is only 1.2 dB,which realized the measurement in non-sound insulation room condition and can be applied to practical engineering.
出处
《测控技术》
CSCD
北大核心
2011年第3期87-89,93,共4页
Measurement & Control Technology
基金
国家自然科学基金资助项目(10674111)
西北工业大学博士论文创新基金资助项目(CX200802)
西北工业大学研究生创业种子基金资助项目(Z2010007)
