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This paper details a method for identifying a set of piece-wise affine linear models that can be used for control design for flapping-winged flight. The paper focuses on diving maneuvers as the application for these models. The flight conditions during the dive are segmented into separate dynamically similar regions, and least-squares is used to estimate affine linear models for each modeling region...
A new method for global nonlinear aerodynamic model identification is presented. Aerodynamic model of aircraft is analyzed, and a simple and effective aerodynamic model is presented. The aerodynamic model of aircraft is then depicted in NARMAX (Nonlinear Auto Regressive Moving Average model with eXogenous inputs) form inside a Linear Regression framework. The items and coefficients of the aerodynamic...
Aircraft simulation platform is the most important supporting technology in the aircraft development process. This simulation platform can be used for validating the design of subsystem and also it provides the necessary data for the Aircraft design. Wind has great impact on the flight parameter. In order to accurately simulate the wind model and calculate the flight parameters, a simulation modeling...
The laminar-to-turbulent transition is one of the most complex but important flows. In order to deeply apprehend the wind turbine airfoil flow characteristics and the transition phenomenon, a two-equation transition model is applied in this article to simulate the flow over a wind turbine S814 airfoil. Typical angle of attack and both steady and unsteady transition models are tried. The predictions...
Reynolds number has a great impact on the performance of the scale model which is smaller than the original wind turbine. In this paper, three-dimensional numerical simulation by using the software FLUENT was applied to obtain the aerodynamic performances of the scale model. A prediction of Reynolds number impact on the scale model was presented and the results agreed well with the conclusion of a...
The atmospheric environment simulation is one of the important parts of synthetic natural environment (SNE) simulation, and plays an important role in the design optimization of weapon system, the simulation of military operations, the assessment of the disaster prevention and reduction decision-making, and so on. The reliability of atmospheric environment simulation depends on how effective to represent...
Tracking reentry vehicle with strong maneuvers on-line is a challenging task. The key is to develop suitable dynamic models and estimation methods. Two kinds of modeling methods are discussed for reentry tracking, and the unscented filter (UKF) is introduced to the nonlinear tracking system. To reduce the computational load, three simplifications of UKF are developed. Furthermore, the feasibility...
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