scholarly journals Feedback control for shaping density distributions of colloidal particles in microfluidic devices

Lab on a Chip ◽  
2019 ◽  
Vol 19 (13) ◽  
pp. 2168-2177 ◽  
Author(s):  
Yu Gao ◽  
Richard Lakerveld
Keyword(s):  
Feedback Control ◽  
Density Distribution ◽  
Control Strategy ◽  
Self Assembly ◽  
Colloidal Particles ◽  
Microfluidic Devices ◽  
Density Distributions ◽  
Automated Feedback ◽  
Feedback Control Strategy

An automated feedback control strategy for directed self-assembly is developed to obtain a desired density distribution.

scholarly journals An Optimal Feedback Control Strategy for Nonlinear, Distributed-Parameter Processes

Processes ◽  
2019 ◽  
Vol 7 (10) ◽  
pp. 758 ◽  
Author(s):  
Debaprasad Dutta ◽  
Simant Ranjan Upreti
Keyword(s):  
Feedback Control ◽  
Oil Recovery ◽  
Control Strategy ◽  
Moving Boundary ◽  
State Feedback Control ◽  
Optimal Feedback Control ◽  
Distributed Parameter ◽  
Optimal State ◽  
Non Linear ◽  
Feedback Control Strategy

In this work, an optimal state feedback control strategy is proposed for non-linear, distributed-parameter processes. For different values of a given parameter susceptible to upsets, the strategy involves off-line computation of a repository of optimal open-loop states and gains needed for the feedback adjustment of control. A gain is determined by minimizing the perturbation of the objective functional about the new optimal state and control corresponding to a process upset. When an upset is encountered in a running process, the repository is utilized to obtain the control adjustment required to steer the process to the new optimal state. The strategy is successfully applied to a highly non-linear, gas-based heavy oil recovery process controlled by the gas temperature with the state depending non-linearly on time and two spatial directions inside a moving boundary, and subject to pressure upsets. The results demonstrate that when the process has a pressure upset, the proposed strategy is able to determine control adjustments with negligible time delays and to navigate the process to the new optimal state.

scholarly journals Feedback control for defect-free alignment of colloidal particles

Lab on a Chip ◽  
2018 ◽  
Vol 18 (14) ◽  
pp. 2099-2110 ◽  
Author(s):  
Yu Gao ◽  
Richard Lakerveld
Keyword(s):  
Feedback Control ◽  
Microfluidic Device ◽  
Self Assembly ◽  
Colloidal Particles ◽  
Control Method ◽  
Feedback Control Method

A novel feedback control method to align colloidal particles reliably via directed self-assembly in a microfluidic device is presented.

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