Adaptive Smith Predictor Control Scheme for a Nonlinear Hydraulic System

2021 ◽  
Author(s):  
D. Krata ◽  
M. Ochman ◽  
M. Panek ◽  
M. Skoczen ◽  
K. Spyra ◽  
...  
Keyword(s):  
Hydraulic System ◽  
Smith Predictor ◽  
Control Scheme

scholarly journals Multitechnique Concise Robust Control for the Insulation Containment Space Pressure Control of LNG Carrier

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Zuojing Su ◽  
Xianku Zhang ◽  
Xu Han
Keyword(s):  
Time Delay ◽  
Robust Control ◽  
Energy Saving ◽  
Pressure Control ◽  
Smith Predictor ◽  
Mapping Technique ◽  
Delay Model ◽  
Nonlinear Feedback ◽  
Maintenance System ◽  
Control Scheme

In this note, a novel multitechnique concise robust control scheme, based on the mirror mapping technique (MMT), closed-loop gain shaping algorithm (CGSA), Smith predictor (SP), and nonlinear feedback technique (NFT), is proposed for the pressure control of the liquefied natural gas (LNG) carrier insulation containment space. Firstly, a kind of integral unstable time-delay model is obtained by linearizing the nonlinear model of the pressure maintenance system around its equilibrium. By using the MMT and CGSA, one acquires the corresponding stable mirror mapping model of the unstable linear model and the designed controller. And the SP is introduced to tackle the time-delay problem. In addition, for the purpose of energy saving, the NFT is added into the control scheme. Finally, a set of experiments has been employed to illustrate the control effects, and the results show that it can achieve satisfying performance in aspects of disturbance rejection and energy saving.

Smith Predictor Position Control for the Inlet Guide Vane of Centrifugal Air Compressors

2006 ◽  
Author(s):  
Angela Sodemann ◽  
Yaoyu Li ◽  
Xin Wu ◽  
Rick Lancaster ◽  
Mark Rucker ◽  
...  
Keyword(s):  
Process Model ◽  
Position Control ◽  
Guide Vane ◽  
External Disturbance ◽  
Pi Controller ◽  
Smith Predictor ◽  
Inlet Guide Vane ◽  
Model Modification ◽  
Control Scheme ◽  
Air Compressors

Fast and accurate positioning of Inlet Guide Vane (IGV) is critical for flow regulation in centrifugal air compressors, especially for surge avoidance control. Both transport delay and external disturbance are present for IGV position control on a compressed air system. A Smith Predictor based control scheme with the process-model modification is applied to this problem. The adopted control scheme can both compensate for the time delay and effectively reject step disturbances present in the IGV system. Simulation was conducted using simple PI controller and a PI controller with the Smith Predictor with process-model modification. It showed that the proposed control scheme can achieve zero steady-state error with the presence of external disturbance and the settling time was shortened. Robust stability and performance of the system was discussed.

Research on Fuzzy Adaptive Control of Multi-Cylinder Synchronous Hydraulic System

2013 ◽  
Vol 456 ◽  
pp. 244-247
Author(s):  
Guo Hua Zhao
Keyword(s):  
Adaptive Control ◽  
Hydraulic System ◽  
Rolling Process ◽  
Pi Control ◽  
Control Effect ◽  
Fuzzy Adaptive Control ◽  
Control Scheme ◽  
Hydraulic Servo ◽  
On Line ◽  
Fuzzy Adaptive

In large continuous rolling process, that the roller can be accurately control have an important impact on production. In allusion to the characteristics of variable and nonlinear of hydraulic servo system parameters for controlling roller position, fuzzy PI control and adjusting the parameters in on-line are used, in order to realize the three cylinder synchronous control. The research results indicate: for system with external force disturbance, the fuzzy adaptive control has a strong anti-interference ability, and improve the robustness of the control system of multi-cylinder synchronization, as a result, to obtain the satisfactory control effect. To be carried out simulation with Matlab, the results show that the fuzzy PI control scheme is a high precision, efficient and feasible method, and can obtain the satisfactory results.

Synchronous Control of Airbag Ejection Mechanism for Underwater Logging Device

2013 ◽  
Vol 706-708 ◽  
pp. 1051-1054
Author(s):  
Chun Fang Dong ◽  
Guo Hong Feng ◽  
Juan Lu
Keyword(s):  
Control Method ◽  
Mathematic Model ◽  
Smith Predictor ◽  
Control Parameters ◽  
Robust Performance ◽  
Synchronous Control ◽  
Tuning Method ◽  
Control Scheme ◽  
Fuzzy Pi Controller ◽  
Ejection Mechanism

For the characteristics of electro-hydraulic position synchronous control system with long pipelines of the underwater logging device’s airbag ejection mechanism, the mathematic model of the single cylinder subsystem considering pipeline effect is established. On this basis, the tracking controller of subsystem is designed by combining a disturbance observer with a Smith predictor and the tuning method of control parameters is given using ITAE criterion. The fuzzy PI controller is designed based on a composite synchronous control scheme. The simulation results show that the proposed control method has good robust performance and can meet the requirement of high precision synchronous.

Research on Control Scheme of Daul-Cyinder Reverse Synchronous Hydraulic System

2013 ◽  
Vol 423-426 ◽  
pp. 2886-2889
Author(s):  
Guo Hua Zhao
Keyword(s):  
Error Correction ◽  
Hydraulic System ◽  
Synchronization Error ◽  
Synchronization Control ◽  
Synchronous Control ◽  
Control Scheme ◽  
Static Performance ◽  
Hydraulic Cylinders ◽  
Feedback Correction ◽  
Control Feedback

In view of the asymmetric reverse synchronization control problem of two hydraulic cylinders, several kinds of synchronous control scheme are put forward,that are total feedback and synchronization error correction,main/auxiliary control feedback and unilateral correction,respective feedback correction and total feedback and total correction.Through research and analysis, we reach the conclusion to make the system to achieve better dynamic and static performance, total feedback synchronization error correction or main/auxiliary control unilateral correction synchronous control scheme is better solution.

scholarly journals Performance evaluation of two degree of freedom conventional controller adopting the smith principle for first order process with dead time

2019 ◽  
Vol 9 (4) ◽  
pp. 3002 ◽  
Author(s):  
Belinda Sharon Bright ◽  
R. Swarnalatha
Keyword(s):  
Degrees Of Freedom ◽  
Dead Time ◽  
Smith Predictor ◽  
System Structure ◽  
Order Process ◽  
First Order ◽  
Time Uncertainty ◽  
Control Scheme ◽  
Control Schemes ◽  
Two Degree Of Freedom

The Proportional Integral Derivative Controller is a typical controller implemented frequently in many services and integrating the Smith predictor is an extremely useful control system structure for processes with dead time. This paper has evaluated two control schemes with the modified structures of the Smith predictor incorporating dead time compensators and conventional controllers for first order process with dead time. The disturbance response and the set point response for both the control schemes were decoupled from each other. Therefore two degrees of freedom control design was formulated, and hence the responses could be designed separately. The two control schemes have mainly two variables to be adjusted that decide the robustness and closed-loop behaviour. This paper also contains the calculation of various parameters that were used in each scheme. A comparison of the two control schemes along with the general Smith predictor control scheme was made using Simulink/Matlab. The conclusion is the second control scheme gave better response overall for the processes with dead time having dead time uncertainty and for the processes with dead time without dead time uncertainty.

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