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Detailed Uncertainty Analysis of the Ares I A106 Liftoff/Transition Database

机译:Ares I A106升空/过渡数据库的详细不确定度分析

摘要

The Ares I A106 Liftoff/Transition Force and Moment Aerodynamics Database describes the aerodynamics of the Ares I Crew Launch Vehicle (CLV) from the moment of liftoff through the transition from high to low total angles of attack at low subsonic Mach numbers. The database includes uncertainty estimates that were developed using a detailed uncertainty quantification procedure. The Ares I Aerodynamics Panel developed both the database and the uncertainties from wind tunnel test data acquired in the NASA Langley Research Center s 14- by 22-Foot Subsonic Wind Tunnel Test 591 using a 1.75 percent scale model of the Ares I and the tower assembly. The uncertainty modeling contains three primary uncertainty sources: experimental uncertainty, database modeling uncertainty, and database query interpolation uncertainty. The final database and uncertainty model represent a significant improvement in the quality of the aerodynamic predictions for this regime of flight over the estimates previously used by the Ares Project. The maximum possible aerodynamic force pushing the vehicle towards the launch tower assembly in a dispersed case using this database saw a 40 percent reduction from the worst-case scenario in previously released data for Ares I.
机译:Ares I A106升空/过渡力和力矩空气动力学数据库描述了Ares I Crew运载火箭(CLV)从升空时刻到低亚音速马赫数从高总攻角过渡到低攻角的空气动力学。该数据库包括使用详细的不确定性量化程序开发的不确定性估计。 Ares I空气动力学小组使用Ares I和塔架组件的1.75%比例模型,开发了数据库和来自NASA Langley研究中心的14英尺至22英尺亚音速风洞测试591中获得的风洞测试数据的不确定性。 。不确定性建模包含三个主要不确定性源:实验不确定性,数据库建模不确定性和数据库查询插值不确定性。最终的数据库和不确定性模型表示该飞行状态的空气动力学预测质量比以前由Ares项目使用的估计有了显着提高。使用此数据库,在分散的情况下,将车辆推向发射塔组件的最大可能的空气动力比以前发布的Ares I数据中的最坏情况降低了40%。

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    Hanke Jeremy L.;

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  • 年度 2011
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