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测试、鉴定并研究高速机动车对环境及在车内所产生的噪声，必须有“安静”的风洞．抑制风洞内的气流噪声，将它的本底噪声降低到车辆噪声以下；测试大厅中在足够低的频率以上获得应有的自由声场范围；所有的声学处理措施不影响风洞的空气动力性能；吸声构件中不含矿物性纤维材料；具有相应的阻燃性能并易于清洁．本文介绍了满足以上所有要求的斯图加特大学空气动力实验室风洞的声学设计和所采用的新型吸声材料，给出了构造大样及实测结果．
There must be “quiet” wind tunnels to test, identify and study the high-speed motor vehicles in the environment and in the car. Suppress the airflow noise in the wind tunnel and reduce its background noise below the noise of the vehicle; Obtain the proper free-sound field range at a sufficiently low frequency in the test hall; All acoustic measures shall not affect the aerodynamic performance of the wind tunnel ; Sound-absorbing member does not contain mineral fiber material; has the corresponding flame retardant properties and easy to clean. In this paper, we introduce the acoustic design of the wind tunnel in the Aerodynamics Laboratory of Stuttgart University to meet all the above requirements and the new sound-absorbing materials adopted.