Subsonic Ultra Green Aircraft Research: Phase II- Volume III-Truss Braced Wing Aeroelastic Test Report

Subsonic Ultra Green Aircraft Research: Phase II- Volume III-Truss Braced Wing Aeroelastic Test Report
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亚音速超绿色飞机研究：第二阶段-第三卷-桁架支撑翼气动弹性测试报告

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发表时间：
2014
期刊：
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通讯作者：
Christopher K. Droney
Christopher K. Droney
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文献类型：
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作者：
M. Bradley;T. J. Allen;Christopher K. Droney

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本试验报告总结了由波音公司亚音速超绿色飞机研究（SUGAR）团队完成的桁架支撑机翼（TBW）气动弹性试验（任务3.1）工作，包括2012年2月至2014年6月的时间段。该团队由波音研究与技术公司、波音商用飞机公司、弗吉尼亚理工大学和NextGen航空公司组成。该模型由NextGen Aeronautics制造，旨在满足全尺寸TBW FEM的动态缩放要求。动态缩放SUGAR TBW半模型的测试分为2013年12月的开环测试和2014年1月至2014年4月的闭环测试。结果表明，颤振机制主要是一个合并的第二次弯曲模式和第一次扭转模式约10 Hz，通过分析预测。结果还表明，随着攻角的变化，颤振速度的显着变化。这种非线性行为可以通过在颤振分析中将预载荷和大位移变化包括到结构刚度和质量矩阵中来解释。从试验系统ID和FEM19状态空间模型导出的控制律成功地抑制了颤振。控制律对各种马赫数、动压和攻角都是鲁棒的，并能抑制颤振。
This Test Report summarizes the Truss Braced Wing (TBW) Aeroelastic Test (Task 3.1) work accomplished by the Boeing Subsonic Ultra Green Aircraft Research (SUGAR) team, which includes the time period of February 2012 through June 2014. The team consisted of Boeing Research and Technology, Boeing Commercial Airplanes, Virginia Tech, and NextGen Aeronautics. The model was fabricated by NextGen Aeronautics and designed to meet dynamically scaled requirements from the sized full scale TBW FEM. The test of the dynamically scaled SUGAR TBW half model was broken up into open loop testing in December 2013 and closed loop testing from January 2014 to April 2014. Results showed the flutter mechanism to primarily be a coalescence of 2nd bending mode and 1st torsion mode around 10 Hz, as predicted by analysis. Results also showed significant change in flutter speed as angle of attack was varied. This nonlinear behavior can be explained by including preload and large displacement changes to the structural stiffness and mass matrices in the flutter analysis. Control laws derived from both test system ID and FEM19 state space models were successful in suppressing flutter. The control laws were robust and suppressed flutter for a variety of Mach, dynamic pressures, and angle of attacks investigated.