Showing papers by "N.H. McClamroch published in 1982"
14 Jun 1982
TL;DR: In this paper, the problem of designing feedback controllers for elastic structures is addressed, where the objective is accurate and robust displacement control of the structure, and the locations of the assigned closed loop poles are specified which guarantee robustness to variations in the actuator time constant and to uncertainties in the structural stiffness.
Abstract: The issue of design of feedback controllers for elastic structures is addressed, where the objective is accurate and robust displacement control of the structure. Motivation for the work arises from study of control of multi-story buildings as part of the pseudo-dynamic-test method. If the force actuators have "fast" dynamics suitable control may be achieved by feedback of structural displacements and velocities, usilng a PID type controller logic. If the force actuators have "slow" dynamics it is suggested that structural accelerations also be fed back to the controller. Locations of the assigned closed loop poles are specified which guarantee robustness to variations in the actuator time constant and to uncertainties in the structural stiffness. Simplifying assumptions are made so that results are obtained using elementary arguments.
01 Dec 1982
TL;DR: In this paper, a framework for sampled data control of large space structures, in terms of discrete time recursive equations in second order form, is developed for analyzing the simplest control scheme where the loop is closed using constant gain output velocity feedback.
Abstract: A framework is developed for sampled data control of large space structures, in terms of discrete time recursive equations in second order form. This framework is used to analyze the simplest control scheme where the loop is closed using constant gain output velocity feedback. It is shown that the closed loop is stable if the feedback gain is positive definite and not too large, and if the output velocity feedback is properly specified. Properties of such a stabilizing controller establish the advantage of analog control of the form considered.