Actuator Placement with Failure Consideration for Static Shape Control of Truss Structures

摘要

ACTIVE control using actuators to obtain high accuracy of the static shape of large space structures is proposed. Unlike vi-. bration control, high-control performance in static shape control is primarily determined by actuator location. A great deal of effort has been made in the last few years on techniques for solving for the optimal actuator placement or the integer optimization problem.1>2 What seems to be lacking, however, is to evaluate the fault tolerance of the obtained actuator placement. In this Note, actuator failures are taken into consideration in the process of optimization.3 In space applications actuator failure may occur, for example, at liftoff of the rocket, in the process of deployment and construction of the space structures and during operation of the actuators. Because it is so costly to repair or exchange a failed actuator in space, the actuators should be located so as to meet mission requirements even in the event of failure.