A Network Virtual Machine for Real-Time Coordination Services
- Real-Time Design and Simulation of An Actuator Failure
Compensation Algorithm for A Rocket Fairing Vibration Reduction
Active vibration control for a rocket fairing system requires
tight timing constraints to guarantee desired system real-time
performance. Actuator failures can cause performance
deterioration or dysfunction of a fairing system, which needs
to be effectively compensated in a timely manner.
In this paper, the actuator failure compensation problem is
formulated and an adaptive actuator failure compensation scheme is
evaluated for a typical actuator failure model that the actuator
output is stuck at some unknown values at unknown time instants.
The adaptive compensation controller is implemented as a task
competing with other tasks for system resources in a real-time
context. The effects of timing constraints such as sampling interval
and control latency are illustrated by simulation on a real-time
simulator. A timing compensation scheme is implemented to
compensate for the detrimental effects caused by real-time constraints.
The effectiveness of timing compensation together with failure
compensation is demonstrated by simulation results.
- Adaptive Actuator Failure Compensation for Vibration Suppression
Control of A Vibroacoustic Structure Model
Actuator failures may lead to performance deterioration of control
systems. A desirable feedback control scheme should be able to coordinate the
remaining actuators to compensate for the damaging effects of the faulty
actuators. This paper develops an
adaptive failure compensation technique for vibration suppression
control of a vibroacoustic structure model with uncertain actuator
failures. A baseline vibration suppression controller is studied first and
the deleterious impact of unknown actuator failures on system performance is
evaluated. An adaptive actuator failure compensation scheme is then developed
to modify the baseline controller design to accommodate actuator
failures whose values, pattern and time instants are uncertain. Simulation
results show that the adaptive design is able to ensure desired system
performance in the presence of actuator failure uncertainties.
- Actuator Failure Compensation Schemes for Vibration Control of A
Rocket Fairing Model
In this paper, the
actuator failure compensation problem is formulated for active vibration control
of a launch vehicle payload fairing. Performance of a nominal optimal control
scheme for active vibration control is analyzed in light of a typical actuator failure
model that certain actuator outputs are stuck at unknown fixed values at unknown time
instants. Three stabilizing control schemes handling
uncertain actuator failures are developed to
ensure closed-loop system signal boundedness in the presence of uncertain
Simulation results are presented to demonstrate their effectiveness.