It is desired to develop a test technique that could replicate the actual free-flight in the wind tunnel. The Wind Tunnel Based Virtual Flight Testing (WTBVFT) would provide this capability. The WTBVFT environment calls for a specialized test model support system, which allows for "free" three-dimensional rotation of the test model. Actual flight hardware could be mounted in the test model and "virtually fly in the wind tunnel" under its own flight control. This paper discusses the simulation method for WTBVFT. Preliminary simulation analyses using 3-DOF pitching motion models in the vertical plane have been conducted with positive results. The objective was to compare the response of a free-flight vehicle with the WTBVFT environment simulation. Test cases included open-loop airframe and closed-loop autopilot controlled cases. These results indicate that for typical autopilot controlled cases the WTBVFT environment is capable of replicating the actual free-flight behavior within acceptable differences.%风洞虚拟飞行试验是把飞行器模型安装在风洞中具有三个转动自由度的专用支撑装置上,让三个角位移可以自由转动或者按照飞行器的飞行要求实时操纵控制舵面,来实现较为逼真的模拟飞行器真实机动运动过程,进而达到探索其气动/运动耦合机理的目的.发展风洞虚拟飞行试验,其模拟方法是必须要解决的核心理论问题.针对某典型导弹,开展了铅垂平面内三自由度俯仰运动的开环控制和闭环控制飞行仿真模拟,分析了风洞虚拟飞行试验和真实飞行之间的主要差异及其影响,研究了风洞虚拟飞行试验的模拟方法.结果表明:对铅垂平面内的三自由度俯仰运动,采用俯仰角速度反馈的经典三回路自动驾驶仪闭环控制方式,风洞虚拟飞行试验能够较为逼真地模拟真实飞行过程.
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