风洞旋转轴天平信号处理系统设计

Design of Signal Processing System for Wind Tunnel Rotating Shaft Balance

摘要:

螺旋桨滑流带来的复杂气动力影响目前只能在风洞试验中获得,为了准确测量气动力、从而获得螺旋桨滑流的影响量,使用旋转轴天平直接与螺旋桨相连并高速同步旋转进行风洞试验。对旋转轴天平的试验原理、数据处理方法进行了深入研究,设计开发了风洞旋转轴天平信号处理系统。综合考虑了信号衰减、电磁环境等干扰问题,通过时钟背板触发启动采集,保证了信号采集的同步性,系统整体处理精度等指标都满足试验技术要求。还创新性地开发出了风洞动态数据连续测量技术,大幅提高了试验效率。经过多次风洞试验测试,实现了对旋转轴天平信号的调理、采集和处理功能,为高效率、低噪声的先进螺旋桨设计和涡桨飞机气动噪声设计提供了技术支持。

Abstract:

The complex aerodynamic influence caused by the propeller slipstream can only be obtained in wind tunnel tests at present. In order to accurately measure the aerodynamic force and obtain the influence of the propeller slipstream, a rotating shaft balance is directly connected to the propeller and rotates synchronously at a high speed to conduct the wind tunnel. test. In-depth research on the experimental principles and data processing methods of the rotating shaft balance was carried out, and the wind tunnel rotating shaft balance signal processing system was designed and developed. Comprehensive consideration of signal attenuation, electromagnetic environment and other interference issues, the acquisition is triggered by the clock backplane to ensure the synchronization of signal acquisition, and the overall processing accuracy of the system and other indicators meet the technical requirements of the test. It also innovatively developed the continuous measurement technology of wind tunnel dynamic data, which greatly improved the test efficiency. After many wind tunnel tests, the functions of conditioning, collecting and processing the signals of the rotating shaft balance have been realized, providing technical support for high-efficiency, low-noise advanced propeller design and turboprop aerodynamic noise design.