scholarly journals Three-level algorithm to control COVID-19 spreading

2021 ◽  
Author(s):  
Giovanni M. Dieguez ◽  
Cristiane M. Batistela ◽  
José Roberto C. Piqueira
Keyword(s):  
Control Strategy ◽  
Control Algorithm ◽  
Compartmental Model ◽  
Public Policies ◽  
Physical Contact ◽  
Level Control ◽  
Model Simulations ◽  
Simple Heuristic ◽  
Model Dynamics

Abstract As the main ways of the coronavirus (COVID-19) spreading are airand physical contact, actions to mitigate and suppress its spreading must bedeveloped in order to change population behavior, providing efficient controlstrategies. Here, these actions are described as a simple heuristic frameworkto establish public policies. The possible effects of these actions are modeledas a stratified control algorithm applied to an extension of the Susceptible-Infected-Removed (SIR) compartmental model. The model dynamics is an-alyzed and validated with simulations considering parameters obtained fromepidemiological data from Brazil and Uruguay. Model simulations allow theproposition of a three-level control strategy that, as the numerical experimentsshow, presents promising results for the development of strategies to reducethe spread of COVID-19.

scholarly journals Three-level algorithm to control COVID-19 spreading

2021 ◽  
Author(s):  
Giovanni M. Dieguez ◽  
Cristiane M. Batistela ◽  
José Roberto C. Piqueira
Keyword(s):  
Control Strategy ◽  
Control Algorithm ◽  
Compartmental Model ◽  
Control Strategies ◽  
Epidemiological Data ◽  
Physical Contact ◽  
Level Control ◽  
Model Dynamics ◽  
Efficient Control ◽  
Frame Work

Abstract As the main ways of the coronavirus (COVID-19) spreading are air and physical contact, actions to mitigate and suppress its spreading must be developed in order to change population behavior, providing efficient control strategies. Here, these actions are described as a simple heuristic frame work to establish public policies. The possible effects of these actions are modeled as a stratified control algorithm applied to an extension of the Susceptible-Infected-Removed (SIR) compartmental model. The model dynamics is analyzed and validated with simulations considering parameters obtained from epidemiological data from Brazil and Uruguay. Model simulations allow the proposition of a three-level control strategy that, as the numerical experiment sshow, presents promising results for the development of strategies to reduce the spread of COVID-19.

Speed regulation control of tractors’ new dual-flow transmission system based on slip rate resistance classification

2021 ◽  
pp. 095440702110105
Author(s):  
Guang Xia ◽  
Yan Xia ◽  
Xiwen Tang ◽  
Linfeng Zhao ◽  
Baoqun Sun
Keyword(s):  
Control Strategy ◽  
Control Algorithm ◽  
Production Efficiency ◽  
Sliding Mode ◽  
Slip Rate ◽  
Speed Control ◽  
Working Environment ◽  
Vehicle Speed ◽  
Speed Change ◽  
Simulation Results

Fluctuations in operation resistance during the operating process lead to reduced efficiency in tractor production. To address this problem, the project team independently developed and designed a new type of hydraulic mechanical continuously variable transmission (HMCVT). Based on introducing the mechanical structure and transmission principle of the HMCVT system, the priority of slip rate control and vehicle speed control is determined by classifying the slip rate. In the process of vehicle speed control, the driving mode of HMCVT system suitable for the current resistance state is determined by classifying the operation resistance. The speed change rule under HMT and HST modes is formulated with the goal of the highest production efficiency, and the displacement ratio adjustment surfaces under HMT and HST modes are determined. A sliding mode control algorithm based on feedforward compensation is proposed to address the problem that the oil pressure fluctuation has influences on the adjustment accuracy of hydraulic pump displacement. The simulation results of Simulink show that this algorithm can not only accurately follow the expected signal changes, but has better tracking stability than traditional PID control algorithm. The HMCVT system and speed control strategy models were built, and simulation results show that the speed control strategy can restrict the slip rate of driving wheels within the allowable range when load or road conditions change. When the tractor speed is lower than the lower limit of the high-efficiency speed range, the speed change law formulated in this paper can improve the tractor speed faster than the traditional rule, and effectively ensure the production efficiency. The research results are of great significance for improving tractor’s adaptability to complex and changeable working environment and promoting agricultural production efficiency.

The Research of Air Precooling System Based on Generalize Predictive Control Strategy

2013 ◽  
Vol 433-435 ◽  
pp. 1091-1098
Author(s):  
Wei Bo Yu ◽  
Cui Yuan Feng ◽  
Ting Ting Yang ◽  
Hong Jun Li
Keyword(s):  
Predictive Control ◽  
Control Strategy ◽  
Control Algorithm ◽  
Exchange Process ◽  
Generalized Predictive Control ◽  
Matlab Simulation ◽  
Control Effect ◽  
Heat Exchange Process ◽  
Complex Control System ◽  
And Control

The air precooling system heat exchange process is a complex control system with features such as: nonlinear, lag and random interference. So choose Generalized Predictive Control Algorithm that has low model dependence, good robustness and control effect, as well as easy to implement. But due to the large amount of calculation of traditional generalized predictive control and can't juggle quickness and overshoot problem, an improved generalized predictive control algorithm is proposed, then carry out the MATLAB simulation, the experimental results show that the algorithm can not only greatly reduce the amount of computation, but also can restrain the overshoot and its rapidity.

The Study of Control Strategy for Sensor-Less PMSM

2014 ◽  
Vol 1006-1007 ◽  
pp. 575-580
Author(s):  
Qing Xie Chen ◽  
Jing Jing Chen ◽  
Yi Biao Fan
Keyword(s):  
Control System ◽  
Permanent Magnet ◽  
High Precision ◽  
Control Strategy ◽  
Control Algorithm ◽  
Simulation Experiment ◽  
Permanent Magnet Synchronous Motor ◽  
Synchronous Motor ◽  
Single Chip

Targeting development of control system of a permanent magnet synchronous motor applied to high precision requirement, A strategy is researched to develop a single chip with built-in sensor-less control algorithm which is used as the control core of PMSM control system, the composition of the hardware and the realization of software of the chip are designed, and the simulation experiment is carried out to verify feasibility and rationality of the control strategy as well.

DC-Bus Dual-Level Control Strategy for PV Power System With Dual-Mode Operation

2019 ◽  
Vol 34 (1) ◽  
pp. 267-276 ◽  
Author(s):  
Terng-Wei Tsai ◽  
Cheng-Jhen Yang ◽  
Yi-Chan Li ◽  
Yaow-Ming Chen ◽  
Yung-Ruei Chang
Keyword(s):  
Power System ◽  
Control Strategy ◽  
Level Control ◽  
Dual Mode ◽  
Mode Operation ◽  
Dc Bus

scholarly journals A Stabilization Method Based on an Adaptive Feedforward Controller for the Underactuated Bipedal Walking with Variable Step-Length on Compliant Discontinuous Ground

Complexity ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-16
Author(s):  
Yang Wang ◽  
Daojin Yao ◽  
Jie He ◽  
Xiaohui Xiao
Keyword(s):  
Control Strategy ◽  
Control Method ◽  
Ground Surface ◽  
Step Length ◽  
Bipedal Walking ◽  
Level Control ◽  
Stabilization Method ◽  
Feedforward Controller ◽  
High Level ◽  
Adaptive Feedforward

Both compliance and discontinuity are the common characteristics of the real ground surface. This paper proposes a stabilization method for the underactuated bipedal locomotion on the discontinuous compliant ground. Unlike a totally new control method, the method is actually a high-level control strategy developed based on an existing low-level controller meant for the continuous compliant ground. As a result, although the ground environment is more complex, the calculation cost for the robot walking control system is not increased. With the high-level control strategy, the robot is able to adjust its step-length and velocity simultaneously to stride over the discontinuous areas on the compliant ground surface. The effectiveness of the developed method is validated with a numerical simulation and a physical experiment.

scholarly journals PID Controller Implemented in Festo CDPX

2019 ◽  
Vol 260 ◽  
pp. 02008
Author(s):  
Primož Podržaj
Keyword(s):  
Control Systems ◽  
Pid Controller ◽  
Control Algorithm ◽  
Closed Loop ◽  
Pi Control ◽  
Programmable Logic ◽  
Educational Tool ◽  
Level Control ◽  
Loop Control ◽  
Machine Interface

In this paper, we describe the procedure for the implementation of the PID controller in the Festo CDPX operator unit. These units enable the execution of the control algorithm and human machine interface in a single unit. In our laboratory the unit is used to teach the students about the basics of control systems. For this purpose, one of the most common closed loop control systems for the education purposes was selected. It is a water level control system. In this paper the design of the whole system is presented. The need for a PI control algorithm is also explained. The programming of the operator unit CDPX, both in Festo CoDeSys and Designer Studio is explained. Such a simple system has turned out to be a great educational tool for Control Theory and Programmable Logic Controller related subjects.

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