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Difficulties in achieving the maximum level of efficiency in power extraction from available wind resources warrant the collective attention of modern control and power systems engineers. A strong movement towards sustainable energy resources, and advances in control system methodologies, make previously unattainable levels of efficiency possible. One such promising method is sliding mode control...
For the aerodynamic parameters identification of projectile and rocket under the influence of random wind, based on the control system sensitivity theory, the formation of the sensitivity and related mathematical models according to realistic systems are formulated. Sensitivity principle of the control system theory is applied to the identification of resistance coefficient. Analyzing missile system...
Three-dimensional unsteady Reynolds averaged incompressible Navier-Stokes equations are used to simulate the aerodynamic performance of a horizontal axis wind turbine. The numerical method that adopted in this paper is proved to be effective to predict horizontal axis wind turbine aerodynamic characteristics by contrasting the numerical results to the wind turbine experimental data. And the curve...
Trajectory correction fuze is the integrated guidance and control and the new fuze technology which can correct trajectory through the fuze. In order to improve solution precision for trajectory correction fuze, a resistance coefficient identification method based on the sensitivity theory of control system is put forward. Combined with test data of the ballistic parameters, resistance coefficient...
Disturbance error mathematic model of unmanned hypersonic test vehicle (UHTV) is analyzed in the paper. To meet the requirement of UHTV flight integration test, the separation disturbance model, the stochastic wind speed model, and uncertainty model of elastic effect are designed. The aerodynamic uncertainty parameters during engine on and off in level flight are given.
Measurement technique for natural ventilation rate cannot support the building's own ventilation potential. Therefore, it is necessary to find a simpler, feasible and precise field-measurement technique. This paper presents the feasibility of using an "artificial airflow passage" to measure the air rate through one outlet, which changes the "random" airflow into "regular"...
This paper presents an experimental investigation of temperature and velocity distribution around a semi-cylindrical diffuser in a large space building. The airflow and temperature distribution characteristics and the relationship between temperature field and velocity field around the diffuser under different supply air volume were experimentally investigated; The temperature boundary layer and velocity...
The design of flight control system for high dynamic aircraft (HDA) requires a more efficient positional accuracy and quicker response of rudder system. Design and experimental studies on electric rudder load simulator is an essential method to study the performance of HDA rudder system. The performance of a real rudder system can be tested by simulating aerodynamic loads under various high dynamic...
Random wind is one of the important factors causing rocket fall points distribution. For the large and complex system, it is difficult to analyze the reliability using the analytic methods, but the computer simulation is an effective way. In this paper, simulation for flight control system is studied in detail by considering wind as typical random process. The engineered model of wind is established...
The ramjet is a new type propulsion system for high-speed flight test aircraft. The ultimate success of sustained high-speed flight will depend on configuring a fine and stable attitude flight control and robust airframe-propulsion-control combination. The mathematical models of high-speed aerodynamic forces and moments were established. A bank-to-turn autopilot structure was used for the longitudinal...
An attitude control system for the unmanned hypersonic test vehicle is presented. The key issues of hypersonic vehicle attitude establishment and linear control concept relating to Supersonic Combustion Ramjet test are considered. Robust controller is designed using mixed sensitivity method. The robustness is evaluated by use of CFD data and simulation results developed to date are presented.
The objective of this paper is to accomplish the modeling and coupling effect analysis of a high-speed aircraft. A 2D model of the high-speed aircraft is assumed. The description of the aerodynamic characteristics including forces and moments system models is included in this paper. The analysis and policies of decoupling are put forward based on the data of the high-speed aircraft. Results show that...
In the flight of cannonball and rocket, due to various random factors the ballistic dynamic parameters in the flight dynamics model will occur randomly. Based on sensitivity function theory of control system and taking the angle movement into account, the algorithm of the sensitivity of the ballistic parameters for the aerodynamic parameters is brought out. In the same time, the degree of aerodynamic...
This paper deals with a problem of turbine engine fault detection in dynamic process by using LPV mathematical model to exactly describe turbine engine dynamic characteristics, eliminate the effects of modeling error. Design robust fault detection filter (FDF) with eigenstructure assignment and realizes disturbance de-coupled with model uncertainty. The simulation results of turbine engine control...
This paper describes the development procedure of a Six-Degree-of-Freedom simulation of a hypersonic cruise vehicle (HCV). The model and Computational Fluid Dynamics (CFD) simulation are developed to make conceptual design studies of hypersonic vehicles with scramjet. A description of the aerodynamic forces and moments system models formulated is included in this paper. As a preliminary step towards...
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