In this article, the issue of attitude control and active vibration suppression of a nonlinear flexible spacecraft is assessed through piezoelectric patches as actuator and sensors. Two controller loops are applied: the inner loop, to make the panel vibration damped through piezoelectric patches; and the outer loop, to perform spacecraft maneuver using the reaction wheel acting on the hub. An o...

This paper concerns the problem of output consensus in nonlinear non-minimum phase systems. The main contribution of the paper is to guarantee achieving consensus in the presence of unstable zero dynamics. To achieve this goal, an output redefinition method is proposed. The new outputs of agents are functions of original outputs and internal states and defined such that the dynamics of agents a...

Perfect output tracking, which requires inversion of the input–output dynamics, is not always a practical control objective. Difficulties are encountered for systems with zeros which are unstable, or stable but lightly damped. When the zeros are unacceptable in the above sense, perfect output tracking would require the control to be either unbounded, or bounded but highly oscillatory. In this p...

ABSTRACT: This paper concerns the problem of output consensus in nonlinear non-minimum phase systems. The main contribution of the paper is to guarantee achieving consensus in the presence of unstable zero dynamics. To achieve this goal, an output redefinition method is proposed. The new outputs of agents are functions of original outputs and internal states and defined such that the dynamics o...

The force control of a constrained one-link flexible arm is considered based on a linear distributed parameter model. To overcome the inherent limitations caused by the non-minimum phase nature of the noncollocation of the joint torque input and the tip contact force output, a passive transfer function is obtained by using the methods of feedback and output redefinition. A passivity-based PD co...

This paper proposes an approximate output tracking control for a class of PWM switched dc-dc converters driving LED lighting systems. The proposed model provides a discrete-time response of the one-cycle average (OCA) value of output signal of the system. Typically, the proposed model has unstable zero dynamics, as well as a nonlinear dependence on the duty ratio control input. Using scheduled ...

since the collapse of the soviet :union:, russia has been affected by intensifying regional and international developments than ever before. because of new opportunities and threats caused by these developments, russia faced with the problem of structural adoption whit systemic new realities, accompanying whit redefinition of its position and review of foreign policy approaches. conceptual and ...

Mining is known to cause high ecological and social impacts especially due its extractive nature on one hand resources reserves mostly being located in developing or emerging economies the other hand. Thus, it can be considered have a paramount role terms of making significant contribution sustainable development. Bearing mind growing economic output generated by humans world population, no won...