风洞声学测量系统研制

Development of acoustic measurement system for wind tunnel

作为5.5m×4m大型低速航空声学风洞的重要组成部分,声学测量系统主要用于准确识别试验模型气动噪声产生的区域,同时完成不同条件下的风洞背景噪声测试。根据国内外声学测量技术的现状,结合气动声学试验的特殊要求,研制了一套高性能的声学测量系统,用于完成气动噪声源定位和风洞背景噪声的准确测量。试验结果表明,该测量系统能够满足风洞声学试验的测试要求。分布式测试结构提高了系统的可靠性和信噪比;即插即用测试技术的应用有效减少了系统的搭建、配置和编程工作,提高了系统的灵活性和可配置性;多线程并行处理算法的设计和TDMS技术的使用实现了153.6MB/s的数据实时流盘,同时构建的分组存储技术为海量数据的有序存储和快速检索提供了保证。

The acoustic measurement system is an important component of the in 5.5m×4m large-scale low-speed aeroacoustic wind tunnel,which is mainly used to accurately identify the ar-ea upon the test model where the aerodynamic noise is generated and measure the background noise of the wind tunnel under different conditions.According to the current status of the acous-tic measurement technology at home and abroad,combined with the specific requirements of aeroacoustics test,a high performance acoustic measurement system has been developed to per-form accurate measurement of aerodynamic noise source location and wind tunnel background noise.Test results show that the measurement system can meet the test requirements in the acoustic wind tunnel.Distributed structure greatly improves the reliability and SNR of the sys-tem.Plug and play technique effectively reduces the construction,configuration and programming work to improve the flexibility and configurability of the system.Multi-threaded parallel processing algo-rithm and TDMS technology can realize the real-time streaming data up to 153.6MB/s,and the packet storage technology provides a guarantee for the orderly storage and fast retrieval of massive data.