Active control of flexible structures /
| Main Author: | |
|---|---|
| Other Authors: | , , , |
| Format: | Thesis Book |
| Language: | English |
| Published: |
1989.
|
| Subjects: | |
| Online Access: | ProQuest, Abstract Link to OAKTrust copy |
| Abstract: | The active control of vibratory motion in distributed parameter systems (DPS) caused by an initial disturbance is considered. Control strategies that eliminate such vibrations in a finite time using a single fixed actuator are proposed. Also explored is possible elimination of vibratory motions by moving actuators. An open loop control strategy based on minimum energy control eliminates totally in finite time a pre-determined set of vibratory modes using a single force actuator. The proposed minimum energy strategy compares well with the true minimum time achieved by a bang-bang control and does not have any intermediate discontinuities that are present in a bang-bang control. It can only have two discontinuities at most. A combination of feedforward and feedback provides robustness. The feedforward is based on the minimum energy solution. The novel control strategies developed yield results that are comparable if not better than those achievable by conventional control strategies. A simple experiment supports the viability of the proposed strategies. Also explored is a novel concept for actively controlling DPS by moving force actuators. The elimination of a pre-determined set of vibratory modes, by one or more moving force actuators is possible. Two such control strategies are proposed. The first strategy uses a finite number of distinct actuators to control an equal number of critical modes. The second uses only a single actuator to control a finite number of critical modes and is based on energy functions. |
|---|---|
| Item Description: | Typescript (photocopy). Vita. "Major subject: Mechanical engineering." |
| Physical Description: | xiv, 209 leaves : illustrations ; 29 cm |
| Bibliography: | Includes bibliographical references. |