Purpose

This paper aims to present an investigation on flight quality analysis and design of tilt-rotor aircraft combined with corresponding flight quality specifications.

Design/methodology/approach

From the perspective of modal characteristics of tilt-rotor aircraft, it focuses on the analysis of the change rules of the longitudinal short-term motion mode, lateral roll convergence mode, spiral mode and Dutch roll mode. Then, the flight quality design research is carried out using the explicit model tracking control method. The quantitative relationship between flight quality requirements and explicit model is established. Accordingly, the closed-loop flight quality of XV-15 tilt-rotor aircraft is evaluated.

Findings

The stability of spiral mode is the result of the interaction of various aerodynamic derivatives and spiral instability occurs in helicopter mode. The other motion modes are stable in full flight mode and meet the requirements of level 1 specified in ADS-33E-PRF and MIL-F-8785C flight quality specifications. There is a quantitative relationship between flight quality requirements and explicit model, and the flight quality of tilt-rotor aircraft is improved through the explicit model tracking control method.

Practical implications

The presented analysis results showed the influence of motion modes and flight quality and the effectiveness of explicit model tracking control method in flight quality improvement, which could be considered as new information for further flight quality design of tilt-rotor aircraft.

Originality/value

The originality of the paper lies in the proposed design and analysis method of the flight quality of tilt-rotor aircraft from the direction of the influence of its aerodynamic derivatives and motion modes.

中文翻译：

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倾转旋翼飞机飞行质量调查

目的

本文旨在结合相应的飞行质量规范，对倾转旋翼飞机的飞行质量分析和设计进行研究。

设计/方法/方法

从倾转旋翼飞行器模态特性的角度，重点分析了纵向短时运动模态、横向滚转收敛模态、螺旋模态和荷兰滚转模态的变化规律。然后，采用显式模型跟踪控制方法进行飞行质量设计研究。建立了飞行质量要求与显式模型之间的定量关系。据此，对XV-15倾转旋翼飞机的闭环飞行质量进行评价。

发现

螺旋模式的稳定性是各种气动导数相互作用的结果，在直升机模式下会出现螺旋不稳定。其他运动模式在全飞行模式下稳定，满足ADS-33E-PRF和MIL-F-8785C飞行质量规范中规定的1级要求。飞行质量要求与显式模型之间存在定量关系，通过显式模型跟踪控制方法提高倾转旋翼飞机的飞行质量。

实际影响

所提出的分析结果表明了运动模式和飞行质量的影响以及显式模型跟踪控制方法在飞行质量改进中的有效性，可为倾转旋翼飞机进一步的飞行质量设计提供新的信息。

原创性/价值

论文的独创性在于从倾转旋翼飞机气动导数和运动模式的影响方向提出了倾转旋翼飞机飞行质量的设计分析方法。