The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
A stratosail has no engine thrust but has the traction by the tether, and the size and direction of the traction have close relationship with the spatial shape of the tether, the wind field and the relative position between the super-pressure helium balloon and the stratosail. This increases some new difficulty in modeling the stratosail. In so doing, the stratosail' reliance on the local wind field...
The PID (proportional, integral, differential) control method is widely applied to missile attitude control. The usual empirical method for optimizing the three control parameters of Kp, Ki and Kd can not optimize them on line and in real time. The paper presents the PID parameter optimization method that uses RBF neural network, applies it to a missile's longitudinal control system parameter optimization...
The hypersonic flight vehicle is powered by ram jet engine whose work has high requirements for its attitude and flight conditions. For example, the control of its angle of attack and sideslip angle must be precise to a certain degree; its flight Mach number and dynamic pressure must be big enough. This paper explores the aerodynamic characteristics such as the variations of drag coefficient, lift...
A stratospheric satellite flies from east to west around the earth in the stratosphere, and a certain number of stratospheric satellites make up the global stratospheric balloon constellation. This paper presents the stratospheric satellite's trajectory control method. It also describes the working principles, component parts and functions of the stratospheric satellite. To establish the model of...
How to retain the high load precision of a motor-driven load simulator in the case of great change in load gradient is one of its key problems. In the past, the compound PID control method was used to improve its load precision. However, because of the influence of its time-varying character and non-linearity, the method does not produce ideal load speed or precision. Taking the characteristics of...
The comprehensive control platform of a simulator is the control center of a hardware in the loop simulation system, whose key technologies are timing precision and timing data synchronization. This paper achieves the precise timing using the high-precision timer under a real-time extension(RTX) system, designs the driving program of VMIC card under the RTX system, studies the data synchronization...
Proportion integral differential (PID) control is widely used for missile control systems, but it is difficult to achieve parameter optimization because the three control parameters Kp, Ki, Kd are empirically selected. Genetic algorithm is a search algorithm that is based on natural selection and genetics principles and randomly generates the initial population of the PID control parameters according...
In the full paper, we apply the single pixel imaging to the generation of infrared images to obtain some pertinent information on missile guidance. We point out that the high-resolution of single pixel imaging can accomplish multi-spectral imaging and has remarkable effect on improving the imaging effects of the seeker and resisting its infrared decoy and background interference because of its obvious...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.