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On-line retuning of PID controllers with fixed threshold samplers.
ISA Trans
August 2023
Departamento de Informática y Automática, UNED, Madrid, Spain. Electronic address:
The appearance of limit cycle oscillations in control systems with fixed threshold based samplers degrades the performance of the control loop, accelerates the wear out of actuators, and introduces an unnecessary communication overhead in distributed control systems. In this paper, the role of the input signals to the control loop is taken into account when analyzing the existence of limit cycles induced by fixed threshold samplers. With this analysis, a methodology to re-tune PID controllers while running to avoid limit cycle oscillations generated by ramp-like excitation signals is presented.
View Article and Find Full Text PDFA Hierarchical Approach to Monitoring Control Performance and Plant-Model Mismatch.
ESCAPE
January 2022
Davidson School of Chemical Engineering, Purdue University, West Lafayette, IN 47907, USA.
Controllers are often tuned during plant commissioning, with a fixed process model. However, over time degradation can occur in the process, the process model and the controller, making it necessary to either re-tune the controller or re-identify the process model. Authors have proposed a variety of approaches to identify plant-model mismatch (PMM) and control performance degradation (CPD).
View Article and Find Full Text PDFAuto-Regression Model-Based Off-Line PID Controller Tuning: An Adaptive Strategy for DC Motor Control.
Micromachines (Basel)
August 2022
Department of Mechatronics and Automation, University of Szeged, 6724 Szeged, Hungary.
Brushed (B) and Brushless (BL) DC motors constitute the cornerstone of mechatronic systems regardless their sizes (including miniaturized), in which both position and speed control tasks require the application of sophisticated algorithms. This manuscript addresses the initial step using time series analysis to forecast Back EMF values, thereby enabling the elaboration of real-time adaptive fine-tuning strategies for PID controllers in such a control system design problem. An Auto-Regressive Moving Average (ARMA) model is developed to estimate the DC motor parameter, which evolves in time due to the system's imperfection (i.
View Article and Find Full Text PDFAn end-to-end computer vision methodology for quantitative metallography.
Sci Rep
March 2022
Scientific Computing Center, Nuclear Research Center-Negev, Be'er-Sheva, Israel.
Metallography is crucial for a proper assessment of material properties. It mainly involves investigating the spatial distribution of grains and the occurrence and characteristics of inclusions or precipitates. This work presents a holistic few-shot artificial intelligence model for Quantitative Metallography, including Anomaly Detection, that automatically quantifies the degree of the anomaly of impurities in alloys.
View Article and Find Full Text PDFEffect of Weight Loss by Low-Calorie Diet on Cardiovascular Health in Type 2 Diabetes: An Interventional Cohort Study.
Nutrients
April 2021
Translational and Clinical Research Institute, Magnetic Resonance Centre, Newcastle University, Newcastle upon Tyne NE4 5PL, UK.
Cardiovascular disease (CVD) remains a major problem for people with type 2 diabetes (T2DM), and the leading cause of death worldwide. We aimed to determine cardiovascular benefits of weight loss with or without remission of diabetes, and to assess utility of plasma biomarkers. 29 people with T2DM were studied at baseline and after dietary weight loss.
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