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 novel dynamic decoupling control method based on Linear Extended State Observer(LESO) for attitude stabilization of coaxial tri-rotor UAV is presented. Coaxial tri-rotor UAV system is a strong coupling, susceptible to disturbance, and multi-input multi-output (MIMO) system. High performance stabilization of such UAV is effected by virous uncertainties and disturbances which are difficult to measure...
The influences of coupling in a launch vehicle between longitudinal, yaw and roll channels are more serious in the region of powered or active flight phase. Due to large speed, the effect of undesired roll and yaw angles induced from coupling dynamics may cause fluctuations on the performance of a desired command tracking trajectory in the longitudinal motion. In this study, the moment of inertia...
The aim of this paper is to design a boundary controller at the top end for global stabilization of two-dimensional marine risers under environmental disturbances. Based on the energy approach, equations of motion of the risers including bending couplings are derived. Due to these couplings, the riser dynamics exhibit mutual effects between transverse motions. The Lyapunov direct method is used to...
Although, for problems with different dimensional fields (from macro to nano, and smaller), the use of solution methods based on continuum mechanics seems essential, however, these approaches don't provide the correct physics in atomic scales. Moreover, to achieve the required precision when micro dimensions are involved, methods based on quantum mechanics should be employed. The present report offers...
The dynamic behavior of the rotor-bearing system of the slider-crank mechanism was studied in this paper. Based on the finite element method, a model of the rotor-bearing system was developed. The calculation results of the numerical simulation demonstrated that dynamic response of the shaft depended on both the bearing stiffness and the dynamic property of the slider-crank such as rotor rotate speed.
Control of relative position and orientation are usually split into two parts in rendezvous and docking missions. It is simple but not precise enough. Based on dual number, this paper derives coupled dynamics equations of two spacecrafts in which the coupling effect of relative position and orientation is indicated. Furthermore, an incremental PID control law is designed to control the coupled system...
In this paper, a method is presented for the dynamic modeling of parallel robots with flexible links and rigid platform. For a 3-RRR planar parallel manipulator, it is divided as three flexible sub-structures and a rigid moving platform. Because flexible sub-structures are connected by the rigid platform, the geometrical constraint relationship between them represent the influences each other. It...
This paper proposes a brand new T-S fuzzy model-based approach to achieve synchronization and desynchronization of coupled dynamical systems. The T-S fuzzy models are given to exactly represent the coupled dynamical systems. We analyze the overall fuzzy synchronization and desynchronization system by applying Lyapunov theory and derive stability conditions by solving linear matrix inequalities (LMI)...
A co-simulation method for rigid-flexible coupling system is proposed in this paper, it is simple and easily carried out. In order to solve the dynamics of 3-TPT parallel robot more accurately, its three driven links are regard as flexible bodies and the other parts are rigid bodies to form the rigid-flexible coupling system, and the dynamics equation of the coupling system is educed by Lagrange's...
This paper presents a dynamic model of a flexible hub-beam system with a tip mass. With the consideration of the second-order term of the coupling deformation field, dynamic equations of the flexible hub-beam system are developed by using assumed mode method (AMM) and Lagrangian principle. The corresponding dynamics model of the tip mass is developed in a consistent manner. Numerical simulations and...
The paper presents comparison of two control techniques (a) sliding mode and (b) forced dynamics for control of electric drives employing permanent magnet synchronous motors with flexible coupling. The designed controllers are of the cascade structure, comprising an inner speed control loop and an outer position control loop. The inner speed control loop for both controllers is based on forced dynamics...
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.