Research Progress and Prospects for Vehicle Dynamic Stability Parameters

Abstract:

Dynamic stability parameters (dynamic derivatives) are important indicators for the control system design, orbit design and longitudinal and horizontal dynamic stability analysis of aircrafts. Methods that evaluate the quality and dynamics of an aircraft typically include flight experiment, wind tunnel testing and theoretical calculation, with one of the most important part of them being the obtainment of dynamic derivatives. Project estimation method derivative action is not considered suitable for boundary layer transition, flow separation and re-attached and the complex situation leeward area vortex small angle of attack linear range. Frequency domain is a dynamic non-scheduled periodic invariant system to get moving derivative calculation method, but the accuracy of the unsteady flow is much lower than the time-domain calculations. Currently, unsteady CFD approach represents a time-domain nonlinear aerodynamic characteristics predicted the most advanced level. Derivative prediction efficiency and adaptability under conditions of high angle of attack of the development trend of nonlinear dynamic derivatives were analyzed. As a global trend, obtaining dynamic parameters through numerical calculation is becoming a prevailing approach to dynamic parameter research.

• Periodical: Applied Mechanics and Materials (Volume 729)
• Pages: 95-100
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.729.95
• Online since: January 2015
• Authors: Xu Liu, Wei Liu, Yun Fei Zhao
• Keywords: Dynamic Derivative, Frequency Domain, Time Domain, Unsteady Flow

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