吸声尖劈测试用驻波管系统研制及试验研究

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 Standing Wave Tude System for Sound Absorbing Wedge

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.