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Review of Numerical Simulations on Aircraft Dynamic Stability Derivatives

机译:飞机动态稳定衍生物数值模拟综述

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The dynamic stability derivatives of flight vehicle are directly related to unsteady aerodynamics during maneuverability, and are considered as key parameters to both the aerodynamics, control system design and flight qualities evaluation. As the rapid development of new conceptual aircraft configurations, higher precision and efficiency calculations of the dynamic stability derivatives are urgently required. Limited by high costs and risks, the traditional experimental ways of flight test and wind tunnel test cannot be widely used, thus the numerical calculation on dynamic stability derivatives have become the primarily approaches. This paper reviews the numerically methods applied in the estimation of aircraft dynamic stability derivatives, includes the early analytical method, the empirical and semi-empirical methods and the widely used modern time domain and frequency domain methods, deeply highlighting the advantages and drawbacks of these methods of the actual applications on various aircrafts. The early analytical method by using potential theory can be used to calculate dynamic stability derivatives and will never work for current geometries. The empirical and semi-empirical methods are available with simple mathematical model and existed data. They have the advantage to be simple and rapid to compute and can be well adapted for initial evaluation of aircraft conceptual design. The time domain analysis based on solving Euler or NS equations with CFD technique are the most widely used methods to obtain the aircraft dynamic stability derivatives. With a variety of different strategies, they can calculate the combined and single dynamic derivatives to satisfy the demand of aircraft design in each stage. Even they are accurate and better in adaptability, the huge time cost on the periodic unsteady flow limits the application. To overcome this problem, the frequency domain methods based on harmonic oscillation are developed. They only use the results at several sample points during the unsteady cycle to reconstruct the periodic unsteady flows to further efficiently obtain the dynamic stability derivatives. These frequency domain methods are currently available only in harmonic oscillation cases. This paper also discusses and analyses the existing problems and possible development directions of the numerical methods to calculate aircraft dynamic stability derivatives from four aspects: theory, calculating elaboration, efficiency and accuracy, and application.
机译:飞行车辆的动态稳定性衍生物在机动性期间与不稳定的空气动力学直接相关,并且被认为是空气动力学,控制系统设计和飞行质量评估的关键参数。随着新概念飞机配置的快速发展,迫切需要更高的动态稳定性衍生物的精度和效率计算。受高成本和风险的限制,飞行试验和风洞试验的传统实验方式不能广泛使用,因此动态稳定性衍生物的数值计算已成为主要方法。本文评价在飞机动态稳定衍生物估计中应用的数控方法,包括早期分析方法,经验和半经验方法和广泛使用的现代时域和频域方法,深深突出了这些方法的优点和缺点各种飞机上的实际应用。使用潜在理论的早期分析方法可用于计算动态稳定性衍生物,永远不会用于当前几何形状。具有简单数学模型和存在数据的实证和半经验方法。它们具有简单且快速地计算的优势,可以很好地适应飞机概念设计的初始评估。基于求解欧拉或NS方程的时域分析是具有CFD技术的最广泛使用的方法,以获得飞机动态稳定性衍生物。通过各种不同的策略,它们可以计算组合和单一的动态衍生物,以满足每阶段飞机设计的需求。即使是它们的适应性准确且更好,周期性不稳定流量的巨大时间成本限制了应用。为了克服这个问题,开发了基于谐波振荡的频域方法。它们在不稳定的循环期间仅使用在几个采样点处的结果来重建周期性不稳定流以进一步有效地获得动态稳定性衍生物。这些频域方法目前仅在谐波振荡案例中可用。本文还讨论并分析了从四个方面计算了数值方法的现有问题和可能的发展方向,从而计算了飞机动态稳定性衍生物:理论,计算阐述,效率和准确性和应用。

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