scholarly journals Adjustment of the PID Gains Vector Due to Parametric Variations in the Plant Model in Terms of Internal Product

2021 ◽  
Author(s):  
José Pinheiro de Moura ◽  
João Viana da Fonseca Neto
Keyword(s):  
Industrial Processes ◽  
Pid Controllers ◽  
Promising Alternative ◽  
Plant Model ◽  
Bulk Solids ◽  
Parameter Variations ◽  
Plant Transfer ◽  
Propagation Matrix ◽  
Plant Parameter ◽  
Specific Project

The tuning of the gains of a controller with proportional-integral-derivative (PID) actions has been prevalent in the industry. The adjustment of these gains in PID controllers is often determined by classical methods, such as Ziegler-Nichols, and trial and error. However, these methods fail to deliver satisfactory performance and often do not meet specific project demands because of the inherent complexity of industrial processes, such as plant parameter variations. To solve the tuning problem in highly complex industrial processes, a controller adjustment method based on the internal product of PID terms is proposed, and a propagation matrix (PM) is generated by the numerator coefficients of the plant transfer function (TF). In the proposed method, each term of the PID controller is influenced by each of the numerator and the denominator coefficients. Mathematical models of practical plants, such as unloading and resumption of bulk solids by car dumpers and bucket wheel resumption, were employed to evaluate the proposed method. The obtained results demonstrated an assertive improvement in the adjustment gains from PID actions, thereby validating it as a promising alternative to conventional methods.

scholarly journals Advanced Kinetic Modeling of Bio-co-polymer Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) Production Using Fructose and Propionate as Carbon Sources

Processes ◽  
2021 ◽  
Vol 9 (8) ◽  
pp. 1260
Author(s):  
Stefanie Duvigneau ◽  
Robert Dürr ◽  
Jessica Behrens ◽  
Achim Kienle
Keyword(s):  
Kinetic Model ◽  
Kinetic Modeling ◽  
Feed Rate ◽  
Raw Materials ◽  
Carbon Sources ◽  
Exhaust Gas ◽  
Current Yield ◽  
Promising Alternative ◽  
Parameter Variations ◽  
Online Measurements

Biopolymers are a promising alternative to petroleum-based plastic raw materials. They are bio-based, non-toxic and degradable under environmental conditions. In addition to the homopolymer poly(3-hydroxybutyrate) (PHB), there are a number of co-polymers that have a broad range of applications and are easier to process in comparison to PHB. The most prominent representative from this group of bio-copolymers is poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV). In this article, we show a new kinetic model that describes the PHBV production from fructose and propionic acid in Cupriavidus necator (C. necator). The developed model is used to analyze the effects of process parameter variations such as the CO2 amount in the exhaust gas and the feed rate. The presented model is a valuable tool to improve the microbial PHBV production process. Due to the coupling of CO2 online measurements in the exhaust gas to the biomass production, the model has the potential to predict the composition and the current yield of PHBV in the ongoing process.

Complementary Sensitivity Design of PID Controllers for Arbitrary-Order Transfer Functions With Time Delay

2008 ◽  
Author(s):  
Tooran Emami ◽  
John M. Watkins
Keyword(s):  
Time Delay ◽  
Transfer Functions ◽  
Linear Time ◽  
Order System ◽  
Pid Controllers ◽  
Single Input Single Output ◽  
Linear Time Invariant ◽  
Single Output ◽  
Plant Transfer ◽  
Time Invariant

A graphical technique for finding all proportional integral derivative (PID) controllers that stabilize a given single-input-single-output (SISO) linear time-invariant (LTI) system of any order system with time delay has been solved. In this paper a method is introduced that finds all PID controllers that also satisfy an H∞ complementary sensitivity constraint. This problem can be solved by finding all PID controllers that simultaneously stabilize the closed-loop characteristic polynomial and satisfy constraints defined by a set of related complex polynomials. A key advantage of this procedure is the fact that it does not require the plant transfer function, only its frequency response.

scholarly journals The Role of H-bonding in Phase Change Materials

2019 ◽  
Author(s):  
Karolina Matuszek ◽  
R. Vijayaraghavan ◽  
Mega Kar ◽  
Douglas Macfarlane
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Hirshfeld Surface ◽  
Industrial Processes ◽  
Heat Of Fusion ◽  
Organic Salts ◽  
Promising Alternative

Phase change materials (PCMs) which melt in the temperature range of 100-230 °C, are a promising alternative for the storage of thermal energy. In this range, large amounts of energy available from solar-thermal, or other forms of renewable heat, can be stored and applied to domestic or industrial processes, or to an Organic Rankine Cycle (ORC) engine to generate electricity. The amount of energy absorbed is related to the latent heat of fusion (ΔH<sub>f</sub>) and is often connected to the extent of hydrogen bonding in the PCM. Herein, we report fundamental studies, including crystal structure and Hirshfeld surface analysis, of a family of guanidinium organic salts that exhibit high values of ΔH<sub>f</sub>, demonstrating that the presence and strength of H-bonds between ions plays a key role in this property.

On the design of observers for insensitivity to plant parameter variations †

1973 ◽  
Vol 18 (3) ◽  
pp. 597-605 ◽  
Author(s):  
J. J. BONGIORNO
Keyword(s):  
Parameter Variations ◽  
Plant Parameter

Energy Savings in Industrial Processes: A Case Study of Strategies and Tuning Procedures for PI and PID Controllers

2012 ◽  
Vol 45 (3) ◽  
pp. 607-612
Author(s):  
F.J. Gomes ◽  
F.P. Queiroz ◽  
I.F. Lopes ◽  
A.A.R. Coelho
Keyword(s):  
Energy Savings ◽  
Industrial Processes ◽  
Pid Controllers

scholarly journals Simulation model of autonomous module of digital PID controller

2021 ◽  
pp. 89-93
Author(s):  
Konstantin Anatolyevich Kuzmin ◽  
Sergey Mikhaylovich Morozov ◽  
Elena Vitalyevna Balmashnova ◽  
Diana Dmitrievna Zueva
Keyword(s):  
Control Systems ◽  
Pid Controller ◽  
Industrial Processes ◽  
Pid Controllers ◽  
Industrial Control ◽  
High Quality ◽  
Industrial Control Systems ◽  
Wide Range ◽  
Digital Pid

Three-channel PID controllers are widely used in industrial control systems. It is noted that the popularity of PID controllers in the control of industrial processes is explained by their ability to ensure high quality of processes in a wide range of modes, as well as functional simplicity that allows engineers to operate them without any problems.

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