直升机水平飞行性能测试中的降维方法

I. Arush, M. Pavel, M. Mulder
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引用次数: 0

摘要

水平飞行所需动力的评估对于任何新的或改进的直升机性能飞行测试工作都是必不可少的。传统的飞行试验方法是基于对直升机在水平飞行中所需的诱导和剖面动力部件的过度简化。这种简单的方法包含了几个缺点,不仅使飞行架次的执行效率低下和耗时,而且还损害了所达到的精度水平。本文提出了一种替代的飞行试验方法,用于评估常规直升机的水平飞行性能,同时解决和纠正常规方法中所有已发现的缺陷。所提出的方法,被称为使用降维校正变量筛选(CVSDR),使用从基本量纲分析原理导出的36个校正变量的原始列表。使用降维工具减少了36个修正变量的列表,以只保留最有效的水平飞行预测器。本文利用一架MBB BO-105直升机的飞行试验数据对CVSDR方法进行了演示和测试。结果表明,CVSDR方法对水平飞行所需功率的预测精度比常规方法提高了约21%,同时将所需飞行时间的估计减少了至少60%。与传统方法不同,CVSDR不受与诱导功率估计相关的高速近似的限制,因此它也与低空速制度相关。这种低空速相关性允许CVSDR方法在水平飞行制度和悬停之间架起桥梁。虽然本文演示的是特定类型的直升机,但CVSDR方法适用于任何类型的常规直升机的平飞性能飞行试验。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A dimensionality reduction approach in helicopter level flight performance testing
Evaluation of the power required in level flight is essential to any new or modified helicopter performance flight-testing effort. The conventional flight-test method is based on an overly simplification of the induced and profile power components required for a helicopter in level flight. This simplistic approach incorporates several drawbacks that not only make execution of flight sorties inefficient and time consuming, but also compromise the level of accuracy achieved. This paper proposes an alternative flight-test method for evaluating the level-flight performance of a conventional helicopter while addressing and rectifying all identified deficiencies of the conventional method. The proposed method, referred to as the corrected-variables screening using dimensionality reduction (CVSDR), uses an original list of 36 corrected variables derived from basic dimensional analysis principles. This list of 36 corrected variables is reduced using tools of dimensionality reduction to keep only the most effective level-flight predictors. The CVSDR method is demonstrated and tested in this paper using flight-test data from a MBB BO-105 helicopter. It is shown that the CVSDR method predicts the power required for level flight about 21% more accurately than the conventional method while reducing the required flight time by an estimate of at least 60%. Unlike the conventional method, the CVSDR is not bounded by the high-speed approximation associated with the induced power estimation, therefore it is also relevant to the low airspeed regime. This low-airspeed relevancy allows the CVSDR method to bridge between the level-flight regime and the hover. Although demonstrated in this paper for a specific type of helicopter, the CVSDR method is applicable for level-flight performance flight testing of any type of conventional helicopter.
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