Feedforward and feedback optimal control with memory for offshore platforms under irregular wave forces

2009 ◽  
Vol 328 (4-5) ◽  
pp. 369-381 ◽  
Author(s):  
H. Ma ◽  
G.-Y. Tang ◽  
W. Hu
Keyword(s):  
Optimal Control ◽  
Wave Forces ◽  
Offshore Platforms ◽  
Irregular Wave ◽  
Feedback Optimal Control ◽  
With Memory

scholarly journals Online Output-Feedback Optimal Control of Linear Systems Based on Data-Driven Adaptive Learning

2020 ◽  
Vol 53 (2) ◽  
pp. 1596-1601
Author(s):  
Jun Zhao ◽  
Jing Na ◽  
Guanbin Gao ◽  
Shichang Han ◽  
Qiang Chen ◽  
...  
Keyword(s):  
Optimal Control ◽  
Linear Systems ◽  
Adaptive Learning ◽  
Output Feedback ◽  
Data Driven ◽  
Control Of Linear Systems ◽  
Feedback Optimal Control

Optimal Control of a Flexible Mechanism Using a Combined Feedforward-Feedback Strategy: Simulation and Experiment

1999 ◽  
Author(s):  
Hubertus v. Stein ◽  
Heinz Ulbrich
Keyword(s):  
Optimal Control ◽  
Control Strategy ◽  
System Performance ◽  
High Speed ◽  
Time Varying ◽  
Linkage Mechanism ◽  
Additional Degree ◽  
Control Approach ◽  
Feedback Optimal Control ◽  
Four Bar Linkage

Abstract Due to the elasticity of the links in modern high speed mechanisms, increasing operating speeds often lead to undesirable vibrations, which may render a required accuracy unattainable or, even worse, lead to a failure of the whole process. The dynamic effects e.g. may lead to intolerable deviations from the reference path or even to the instability of the system. Instead of suppressing the vibration by a stiffer design, active control methods may greatly improve the system performance and lead the way to a reduction of the mechanism’s weight. We investigate a four-bar-linkage mechanism and show that by introducing an additional degree of freedom for a controlled actuator and providing a suitable control strategy, the dynamically induced inaccuracies can be substantially reduced. The modelling of the four-bar-linkage mechanism as a hybrid multi body system and the modelling of the complete system (including the actuator) is briefly explained. From the combined feedforward-feedback optimal control approach presented in (v. Stein, Ulbrich, 1998) a time-varying output control law is derived that leads to a very good system performance for this linear discrete time-varying system. The experimental results show the effectiveness of the applied control strategy.

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