scholarly journals Closed-loop model identification of cooperative manipulators holding deformable objects

2017 ◽  
Vol 260 ◽  
pp. 012035
Author(s):  
A A Alkathiri ◽  
R Akmeliawati ◽  
N Z Azlan
Keyword(s):  
Closed Loop ◽  
Model Identification ◽  
Deformable Objects ◽  
Loop Model ◽  
Cooperative Manipulators

Closed-loop model identification and PID/PI tuning for robust anti-slug control

2013 ◽  
Vol 46 (32) ◽  
pp. 233-240 ◽  
Author(s):  
Esmaeil Jahanshahi ◽  
Sigurd Skogestad
Keyword(s):  
Closed Loop ◽  
Model Identification ◽  
Loop Model

Discrete-Time Closed-Loop Model Identification of Fixed-Structure Unstable Multivariable Systems

2007 ◽  
Author(s):  
Huzefa Shakir ◽  
Won-Jong Kim
Keyword(s):  
System Identification ◽  
Discrete Time ◽  
Closed Loop ◽  
Model Identification ◽  
Order Reduction ◽  
Loop System ◽  
Loop Model ◽  
Frequency Range ◽  
Closed Loop System ◽  
Closed Loop Identification

This paper presents improved empirical representations of a general class of open-loop unstable systems using closed-loop system identification. A multi-axis magnetic-levitation (maglev) nanopositioning system with an extended translational travel range is used as a test bed to verify the closed-loop system-identification method proposed in this paper. A closed-loop identification technique employing the Box-Jenkins (BJ) method and a known controller structure is developed for model identification and validation. Direct and coupling transfer functions (TFs) are then derived from the experimental input-output time sequences and the knowledge of controller dynamics. A persistently excited signal with a frequency range of [0, 2500] Hz is used as a reference input. An order-reduction algorithm is applied to obtain TFs with predefined orders, which give a close match in the frequency range of interest without missing any significant plant dynamics. The entire analysis is performed in the discrete-time domain in order to avoid any errors due to continuous-to-discrete-time conversion and vice versa. Continuous-time TFs are used only for order-reduction and performance analysis of the identified plant TFs. Experimental results in the time as well as frequency domains verified the accuracy of the plant TFs and demonstrated the effectiveness of the closed-loop identification and order-reduction methods.

scholarly journals A computationally efficient physiologically comprehensive 3D–0D closed-loop model of the heart and circulation

2021 ◽  
Vol 386 ◽  
pp. 114092
Author(s):  
Christoph M. Augustin ◽  
Matthias A.F. Gsell ◽  
Elias Karabelas ◽  
Erik Willemen ◽  
Frits W. Prinzen ◽  
...  
Keyword(s):  
Closed Loop ◽  
Loop Model ◽  
Computationally Efficient

The application of compound proportional resonant control strategy in multiple PV inverters system

2018 ◽  
Vol 32 (34n36) ◽  
pp. 1840098
Author(s):  
Yuan Li ◽  
Huifang Shen ◽  
Chao Xiong ◽  
Yaofei Han ◽  
Guofeng He
Keyword(s):  
Control Strategy ◽  
Closed Loop ◽  
Control Strategies ◽  
Integrated Control ◽  
Reference Signal ◽  
Loop Model ◽  
Harmonic Compensation ◽  
Feed Forward ◽  
Feed Forward Control ◽  
Set Up

In order to eliminate the effect on the grid current caused by the background harmonic voltage and the reference signal on the grid connected multi-inverter, this paper adopts the double closed-loop feed-forward control strategy. This strategy is based on the inductor voltage and the grid-connected current, and the integrated control strategy of quasi-proportional resonance loop parallel to a specific harmonic compensation loop. Based on the closed-loop model of multiple inverters, the change curves of the transfer function of the two control strategies are compared with the feed-forward control and the composite proportional resonance. The two corresponding control methods are used to analyze the current quality of the multi-inverter impact. Finally, the MATLAB/Simulink simulation model is set up to verify the proposed control strategies. The simulation results show that the proposed method can achieve better tracking of the sinusoidal command signal at the fundamental frequency, and enhance the anti-interference ability of the system at the 3rd, 5th, and 7th harmonic frequency.

scholarly journals Finite frequency H∞control design for nonlinear systems

2021 ◽  
Vol 12 (1) ◽  
pp. 567
Author(s):  
Zineb Lahlou ◽  
Abderrahim EL-Amrani ◽  
Ismail Boumhidi
Keyword(s):  
Nonlinear Systems ◽  
Continuous Time ◽  
Closed Loop ◽  
Sufficient Conditions ◽  
Control Design ◽  
Loop Model ◽  
Finite Frequency

The work deals finite frequency H<sub>∞</sub> control design for continuous time nonlinear systems, we provide sufficient conditions, ensuring that the closed-loop model is stable. Simulations will be gifted to show level of attenuation that a H<sub>∞</sub> lower can be by our method obtained developed where further comparison.

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