Experimental Investigation on Technology of Force Measurement Using a Distributed-sting-balance in Wind Tunnel

Abstract

The processing and assembly error of using twin-trail support measurement modes can increase the internal stress of the system,and influence the measurement accuracy. According to the aerodynamic measurement demand of CTS wind tunnel experiment with twin-fuselage aircraft,the distributed-sting-balance force measurement technology based on multi-force built in wind tunnel is developed. A twin-sting-balance measurement system with the function which can eliminate the internal stress of the system is carried out. Two calibration methods for the sixcomponent twin-sting-balance measurement system are proposed. The reliability of the data processing and twinsting-balance system is performed with inspection loading,contrastive analysis and verification. The results show that the distributed twin-sting-balance force measurement technology can eliminate the inherent internal stress caused by the over-constraint of the twin-sting-balance system effectively. The twin-sting-balance system can obtain high stability of connection for each part and measurement. The measurement accuracy of both calibration methods is comparable,which can achieve the error level of single strain balance,and meet the precision requirement of the wind tunnel experiment. The wind tunnel experiment is conducted with the method of combination calibration taking into account the calibration capability of the calibration,and a satisfying measurement precision is obtained.

Keywords

• distributed support
• force measurement experimental technology
• twin-sting-balance
• elimination of the internal stress
• balance calibration