Comparison of Damping Estimation Techniques for Flight Tests
Comparison of Damping Estimation Techniques for Flight Tests
复制标题
飞行试验阻尼估计技术的比较
DOI：
10.1109/ibcast.2019.8667242
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Muhammad Ajmal
中科院分区：
文献类型：
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作者：
Usman Zaheer;Muhammad Ajmal
阻尼估计在飞机颤振试飞中起着非常关键的作用。高阻尼结构比低阻尼结构更稳定。在航空航天界，阻尼计算采用不同的方法。本文介绍并比较了两种阻尼估计方法：随机减量法和半功率法。半功率方法进一步评估与输出和传递函数的计算。时域分析采用随机减量法，频域分析采用半功率法。每种技术都有自己的优点和缺点。结合实际试飞数据对这些技术进行了分析和讨论。这两种技术在相似的测试条件下提供了相当的数据结果。然而，RDD技术提供了更好的阻尼估计密集的模式和差的信号噪声比。
Damping estimation plays a very critical role in flutter flight testing of an aircraft. Highly damped structures are more stable than lightly damped structures. Different techniques are used in aerospace community for the computation of damping. This paper describes and compares two damping estimation techniques which are Random Decrement & Half Power method. Half power method was further evaluated with output only and transfer function based computation. Random decrement method (RDD) was used for the time domain data analysis whereas half power method was used for frequency domain analysis. Each technique has its own merits and demerits. These techniques have been analyzed and discussed based on the actual flight test data. Both techniques provided comparable results for the data at similar test conditions. However, RDD technique gives better damping estimation for closely spaced modes and poor signal to noise ratios.