电传飞机飞行品质低阶等效系统算法研究

Low Order Equivalent System Identification Method to Evaluate Flying Qualities of Fly-by-Wire Aircraft

摘要:

研究了从飞行试验数据辨识电传飞机动力学模型的低阶等效系统参数的方法。采用频域相干性分析和高精度有限傅立叶变换对试验数据进行了精确的频谱分析。频域方程误差法、输出误差法和单纯形法相结合，为计算电传飞机的低阶等效系统提供了一个实用有效的算法，并使用某型电传飞机试验数据进行了可靠性和有效性验证。结果表明：使用本文的方法辨识的低阶等效系统模型能够准确地描述真实电传飞机的动力学特性。本文的研究内容为电传飞机飞行品质试验方法提供了技术支持。

Abstract:

This article carries on a research on the identification of low order equivalent system dynamic models of fly-by-wire aircraft from flight test data. Frequency domain spectral analysis method is conducted and practical transfer function models are proposed in the article. A frequency domain identification technique is developed by using the output error and equation error parameter identification integrated with Simplex method. The algorithm is validated based on certain aircraft flight test data. The results show good consistency with flight test data and the low order equivalent system identified can properly describe the dynamic response characteristics of fly-by-wire aircraft. This work could provide technique support for flying quality evaluation of fly-by-wire aircraft.