The Experts below are selected from a list of 387405 Experts worldwide ranked by ideXlab platform
Z Q Sun - One of the best experts on this subject based on the ideXlab platform.
-
vibration control for a flexible link robot arm with deflection feedback
International Journal of Non-linear Mechanics, 2003Co-Authors: S K Tso, T W Yang, Z Q SunAbstract:The use of flexible links in a robot inevitably causes the elastic deflection and vibration of the endpoint of the robot during high-speed operations. The deflection and vibration will tend to degrade the positioning performance of the robot. In this paper, an optical sensing System consisting of a laser diode and a position sensitive detector is introduced for the real-time measurement of the Dynamic deflection. Utilising a non-linear, coupled and measurement-based Dynamic System Model, a Lyapunov-type controller based on the deflection feedback is then proposed to damp out the tip oscillations and regulate the endpoint of the flexible robot. Experimental tests are conducted for a flexible one-link robot arm with a payload mass at the tip. The results demonstrate the effectiveness of the proposed measuring and control schemes.
Xin Xin - One of the best experts on this subject based on the ideXlab platform.
-
a switched Dynamical System approach towards the economic dispatch of renewable hybrid power Systems
International Journal of Electrical Power & Energy Systems, 2018Co-Authors: Kanjian Zhang, Ming Cheng, Xin XinAbstract:Abstract This paper considers an economic dispatch problem of renewable hybrid power Systems. According to the analysis of the renewable hybrid power System Dynamic behavior, the problem is Modelled as an optimal control problem of switched Dynamic Systems. As is known to all, the frequent switching may cause that the engine wear is increased, and the service life is reduced. Then, some switching constraints are imposed to the switched Dynamic System Model. However, these switching constraints lead to a non-connected feasible region for the optimal control problem with unknown switching instants, integer variables, and continuous variables. Thus, it is difficult to solve such problem by using conventional optimization methods, such as sequential quadratic programming. To overcome this difficulty, by using the time-scaling transformation technology and introducing an auxiliary continuous vector derive a more tractable equivalent problem, in which the variable switching instants and the switching sequence are replaced with conventional continuous parameter variables. Then, based on an exact penalty function, an alternative computational method is developed for solving the problem. Finally, three numerical examples are solved by using the proposed algorithm. The numerical results show that although the optimal costs with switching constraints slightly higher than the optimal costs without switching constraints, the proposed algorithm can effectively avoid the additional switches. In addition, the numerical results also show that the switched Dynamical System approach is low time-consuming and obtains a better cost function value than the existing approaches.
S K Tso - One of the best experts on this subject based on the ideXlab platform.
-
vibration control for a flexible link robot arm with deflection feedback
International Journal of Non-linear Mechanics, 2003Co-Authors: S K Tso, T W Yang, Z Q SunAbstract:The use of flexible links in a robot inevitably causes the elastic deflection and vibration of the endpoint of the robot during high-speed operations. The deflection and vibration will tend to degrade the positioning performance of the robot. In this paper, an optical sensing System consisting of a laser diode and a position sensitive detector is introduced for the real-time measurement of the Dynamic deflection. Utilising a non-linear, coupled and measurement-based Dynamic System Model, a Lyapunov-type controller based on the deflection feedback is then proposed to damp out the tip oscillations and regulate the endpoint of the flexible robot. Experimental tests are conducted for a flexible one-link robot arm with a payload mass at the tip. The results demonstrate the effectiveness of the proposed measuring and control schemes.
Harald Aschemann - One of the best experts on this subject based on the ideXlab platform.
-
an interval observer approach for the online temperature estimation in solid oxide fuel cell stacks
European Control Conference, 2018Co-Authors: Andreas Rauh, Julia Kersten, Harald AschemannAbstract:Interval observers that are based on the structural property of cooperativity allow for the computation of guaranteed lower and upper bounds for all state trajectories of Dynamic Systems by defining two sets of bounding Systems for the Dynamic behavior. In such a way, they remove the disadvantage of predictor-corrector interval estimation schemes which often suffer from the fact that the Dynamic System Model has to be evaluated over finitely large domains of state variables and parameters (often interval boxes or zonotopes). This evaluation typically results in overestimation that includes unphysical parts of the state-space in the computed results. To counteract this so-called wrapping effect, computationally expensive, problem-specific algorithms need to be implemented. However, this drawback can be removed for Systems that have certain monotonicity and stability properties. In this paper, it is shown that appropriately defined System Models for the thermal behavior of high-temperature fuel cells belong to this class of Systems. The corresponding interval observer design is presented methodologically and demonstrated with the help of measured data from a test rig available at the Chair of Mechatronics at the University of Rostock.
Jacob Brouwer - One of the best experts on this subject based on the ideXlab platform.
-
novel solid oxide fuel cell System controller for rapid load following
Journal of Power Sources, 2007Co-Authors: Fabian Mueller, Faryar Jabbari, Robert Gaynor, Jacob BrouwerAbstract:Abstract A novel SOFC System control strategy has been developed for rapid load following. The strategy was motivated from the performance of a baseline control strategy developed from control concepts in the literature. The basis for the fuel cell System control concepts are explained by a simplified order of magnitude time scale analysis. The control concepts are then investigated in a detailed quasi-two-dimensional integrated Dynamic System Model that resolves the physics of heat transfer, chemical kinetics, mass convection and electrochemistry within the System. The baseline control strategy is based on the standard operating method of constant utilization with no control of the combustor temperature. Simulation indicates that with this control strategy large combustor transients can take place during load transients because the fuel flow to the combustor increases faster than the air flow. To alleviate this problem, a novel control structure that maintains the combustor temperature within acceptable ranges without any supplementary hardware was introduced. The combustor temperature is controlled by manipulating the current to change the combustor inlet stoichiometry. The load following capability of SOFC Systems is inherently limited by anode compartment fuel depletion during the time of fuel delivery delay. This research indicates that future SOFC Systems with proper System and control configurations can exhibit excellent load following characteristics.
