吸声尖劈测试用驻波管系统研制及试验研究  

Research and Development and Related Experimental Study of Standing Wave Tude System for Sound Absorbing Wedge

作　　者：姚磊[1] 童宪[2] 裘剑敏[1] 罗丰[1] 王欢 

机构地区：[1]浙江省计量科学研究院,杭州310013 [2]中国计量学院,杭州310018 [3]上海声望声学工程有限公司,上海200335

出　　处：《噪声与振动控制》2012年第3期206-211,共6页Noise and Vibration Control

摘　　要：主要介绍吸声尖劈测试用驻波管系统的研制及相关试验的研究工作。本系统的构建与测试基于驻波比原理,管体矩形截面为0.6 m×0.6 m,长度为7.2 m。系统通过传声器传动系统实现管内声压随距离变化的自动测量,距离分辨率可达0.3 mm(5 mm/s移动速度下),在40 Hz^280 Hz频段内可对材料的吸声系数、声阻抗、反射系数、声导纳进行测试,克服传统驻波比测量方法测试精度不高、测量效率低的缺点,为高效、准确测量材料吸声性能提供很好的途径。目前还未见国内关于类似系统的报道,依据相关国家校准规范经第三方计量部门鉴定,各项技术指标均满足要求。同时还通过试验研究得出对实际吸声尖劈测试具有借鉴意义的结论。Research and development and related experimental study of a standing wave tube system applied in sound absorbing wedge measurement were discussed in this article. Based on standing wave ratio principle, the tube system with 0.6 m-0.6 m rectangular cross-section and 7.2 m length was constituted. Sound pressure along the axial distance in the tube was measured through the microphone driven by an automatic driving system which has a distance resolution of 0.3 mm at 5 mm/s velocity. The acoustical parameters, such as sound absorbing coefficient, acoustic impedance, reflection factor and acoustic admittance can be obtained through the system within frequency band 40-280 Hz. The system overcame the shortcomings of traditional standing-wave measurement methods, which are the low measurement efficiency and low measurement precision. A new efficient and precise method was then provided for sound absorbing test. No similar system has been found in our country so far. The system was calibrated by a superior metrology institute and the technical data can meet the demands. Furthermore, the experiment related to the system was done and some referential conclusions for sound absorption measurement were obtained.

关 键 词：声学 吸声尖劈 驻波管 驻波比 吸声系数 

分 类 号：TU112.22[建筑科学—建筑理论]