风洞模型载荷实验测量系统开发与研究

Design and Research on Wind Tunnel Model Experiments

摘要:

本文为解决风洞实验室模型风载荷实验测量相关技术问题而展开。根据该类型实验特点及要求,设计了测量系统方案,组建测量软硬件系统,采用多种传感器完整测量风载荷、风速、温湿度等多种数据,进行数据融合处理得到风载荷系数；为确保实验测量精度,考虑了天平零漂、空气密度变化、模型自重干扰等因素的影响,通过分析给出了其各自的数据处理方法以得到有效的风载荷；在此基础上完成测量程序的编写,基本实现实验测量自动化,避免手工介入,大幅提高了实验效率。最后应用本文结果展开实际实验测量,定量分析各因素对于测量结果的影响,结果表明,空气密度变化、模型自重干扰、风速波动对模型风载荷结果影响较为明显,在计算风载荷系数时需采用每一工况的实时数据；而信号噪声对均值结果几乎无影响而不用考虑。

Abstract:

This paper aims to develop an integrated measurement system on wind load experiments with automation technique support, which would solve application measurement problems of the authors’ laboratory. A measurement scheme is proposed including hardware and software systems with fully detailed specifications, to improve experiment accuracy, several kinds of sensors/balances are employed to fully measure wind load, wind speed, air temperature and humidity, etc. Data process methods are given to handle the problems of balance’s zero point drift, air density determination, model weight influence. Based on the above, an online software program is coded with consideration of automatic data process and sensors compatibility, it implements many functions on wind load experiments, in order to improve efficiency and avoid manual operations. At the end, an experiment on an offshore service vessel is conducted to verify the job of this paper, which shows agreeable result and high efficiency, corresponding analysis is also carried out to verify every factors’ influence, the results show that air density fluctuation, model weigh influence and wind speed fluctuation have remarkable effect on experiment result, while signal noise has litter effect.