ABSTRACT
Vibration damping for a thin piezoactuated cantilever plate is pursued through either purely passive or purely active control. The design is carried out by using suitable reduced order models of the coupled electro-mechanical structure. Simulation results are presented in order to evaluate the proposed control laws.
Key Words Vibration damping, piezoelectric finite-elements, LQG control.
ABSTRACT
This article addresses the need for optimal actuation in distributed-parameter systems dominated by conductive heat transfer,such as in thermal processing of materials.An LQR-based approach is developed,which determines the optimal location and the power of the actuator at successive time periods,by piece-wise minimization of the quadratic performance indices corresponding to theses subintervals.This algorithm is applied to a finite dimensional representation of the temperature state and heat input distributions,yielding a suboptimal but computationally efficient heat source guidance strategy.This is shown to warrant superior temperature tracking performance over fixed —location actuation,by FEA simulations.
ABSTRACT
In this short note we announce an existence and uniqueness result for solutions to a class of second order distributed parameter systems with sudden changes in the input term. Such systems are often encountered in exible structures and structure- uid interaction systems that utilize smart actuators.
ABSTRACT
This paper deals with the application of in…nite-dimensional delay dynami-cal systems in the study of multiple regenerative chatter machining. Bifurcation equations describing the dynamics when linearized stability is lost have been derived. Two cases are considered. First, when Hopf’s conditions hold, and second when one of them is violated.
Key Words. Regenerative chatter, degenerate bifurcation, delay di¤erential equations.