scholarly journals Design of Multivariable Control System of a Distillation Tower via Simulation Using MATLAB/Simulink

2019 ◽  
Vol 26 (3) ◽  
pp. 51-61
Author(s):  
Duraid F. Ahmed ◽  
Mohanad Y. Nawaf
Keyword(s):  
Control System ◽  
Flow Rate ◽  
Absolute Error ◽  
Multivariable Control ◽  
Reflux Ratio ◽  
Distillation Tower ◽  
Matlab Simulink ◽  
Set Point ◽  
Condenser Temperature ◽  
Fast Access

This paper deals with the multivariable control system of the distillation tower by applying multi-structures in MATLAB/Simulink for a binary mixture of benzene and toluene. Four structures configurations of the distillation are applied based on the level and temperature variables. The PID controller is used in all structures in multivariable. These structures are compared with different disturbances. The integral absolute error is a criterion to test the controller\\\’s performance under step change disturbances. The controller\\\’s performance was investigated by recording responses to disturbances in set-point of reflux ratio, flow-rate of top and bottom products. The step testing appears to be the single-ended temperature control with bottom and top-level structures to regulate the flow rate of the bottom and top products. The best structure is top-level, bottom level and condenser temperature because the column made more stable, the integral absolute error is minimum value and fast access to set-point value.

Parameter Estimation of Maneuvering Variables of SIGMA-Extended War Ship Using Kalman Filter

2018 ◽  
Vol 874 ◽  
pp. 96-102
Author(s):  
Aulia Siti Aisjah ◽  
Agoes Ahmad Masroeri ◽  
Nathanael Leon Gozali ◽  
Ridho Akbar ◽  
Devina Permata Sari ◽  
...  
Keyword(s):  
Parameter Estimation ◽  
Kalman Filter ◽  
Control System ◽  
Absolute Error ◽  
Sea State ◽  
Set Point ◽  
Extended Class ◽  
A Performance

SIGMA-class warship one of warship type is designed up to sea state 6. The ship was redesigned in enlarged dimensions, and called SIGMA extended class warships. A control system can give a performance of response in accordance to the set point when the value of controlled variable can be transmitted to the controller accurately. The characteristic of sensor is not usually able to tranmit a proper value, due to the noise on the sensor and also the environment disturbances. This paper describe a strategy of Kalman filter to estimate variables controlled when the presence noise on the compass or gyrocompas. The result of Kalman filter implementations give the magnitude of the integral absolute error of yaw and sway less than 5%, when there are noise on the measurement and the disturbances.

scholarly journals Anfis Based Material Flow Rate Control System for Weigh Feeder Conveyor

2016 ◽  
Vol 9 (2) ◽  
pp. 112
Author(s):  
Dibaj Al Rosyada ◽  
Misbah Misbah ◽  
Eliyani Eliyani
Keyword(s):  
Control System ◽  
Flow Rate ◽  
Weight Control ◽  
Fuzzy Logic Controller ◽  
Fuzzy Inference ◽  
Average Error ◽  
Inference System ◽  
Set Point ◽  
Amount Of Knowledge ◽  
Inference Systems

Weight control system on the feeder conveyor determines the factor of the quality of products within an industry. The dynamics of the flow rate of material through the feeder conveyor weigh requires a good level of performance controllers. The base of current controllers such as FLC (Fuzzy Logic Controller) requires a certain amount of knowledge and expertise in its design that will make it difficult to achieve good system performance. These difficulties can be overcome by using systems based on ANFIS (Adaptive Neuro-Fuzzy Inference System). By doing the learning offline, using ANFIS can be obtained by fuzzy inference systems to create a controller FLC. Microcontroller  have  FLC controller program, its integrated with notebook can monitor and control the notebook weigh feeder conveyor system. Designing a system that has been created will give good results with an average error value of 3.86% at the set-point of 1000 grams / minute, and the average error of 5.03% on set-point 2000 grams / minute in ten times testing.

scholarly journals Model-Based Flow Rate Control with Online Model Parameters Identification in Automatic Pouring Machine

Robotics ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 39
Author(s):  
Nobutoshi Kabasawa ◽  
Yoshiyuki Noda
Keyword(s):  
Control System ◽  
Flow Rate ◽  
Rate Control ◽  
Absolute Error ◽  
Inverse Model ◽  
Parameters Identification ◽  
Working Environment ◽  
Model Parameters ◽  
Tilting Angle ◽  
Flow Rate Control

In this study, we proposed an advanced control system for tilting-ladle-type automatic pouring machines in the casting industry. Automatic pouring machines have been introduced recently to improve the working environment of the pouring process. In the conventional study on pouring control, it has been confirmed that the pouring flow rate control contributes to improving the accuracy of the entire automatic pouring machine, such as the outflow liquid’s falling position from the ladle, the liquid’s weight filled in the mold, and the sprue cup’s liquid level. However, the conventional control system has problems: it is not easy to precisely pour the liquid in the ladle with a large tilting angle, and it takes time to adjust the control parameters. Therefore, we proposed the feedforward pouring flow rate control system, constructed by the pouring process’ inverse model with the online model parameters identification. In this approach, we derived the pouring process’ mathematical model, representing precisely the pouring process with the ladle’s large tilting angle. The model parameters in the pouring process’ inverse model in the controller are updated online via the model parameters identification. To verify the proposed pouring control system’s efficacy, we experimented using the tilting-ladle-type automatic pouring machine. In the experimental results, the mean absolute error between the outflow liquid’s weight and the reference weight was improved from 0.1346 at the first pouring to 0.0498 at the fifth pouring. Moreover, the model parameters were identified within 4 s. Therefore, it enables updating the controller’s parameters within each pouring motion interval by the proposed approach.

scholarly journals Use of Fixed and Variable Speed Pumps in Water Distribution Networks with Different Control Strategies

Water ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 479
Author(s):  
Christian X. Briceño-León ◽  
Pedro L. Iglesias-Rey ◽  
F. Javier Martinez-Solano ◽  
Daniel Mora-Melia ◽  
Vicente S. Fuertes-Miquel
Keyword(s):  
Control System ◽  
Flow Rate ◽  
Water Distribution ◽  
Control Strategies ◽  
Distribution Networks ◽  
Optimal Number ◽  
Variable Speed ◽  
Set Point ◽  
Pumping Station ◽  
Point Curve

The control system’s point is to bring the pumping curve close to the set-point curve. That concept is essential for proper design of a pumping station. An adequate design is focused not only on selecting the total number of pumps and the type of control to use (flow or pressure), but it also is important to determine the optimal number of fixed speed pumps (FSPs) and variable speed pumps (VSPs) for each flow rate. This work discusses the most common methods and procedures for control systems on a design of pumping stations with a proposed methodology. This methodology consists of expressing the characteristics of the pumping curve and the set-point curve in a dimensionless form so that the methodology is standardized for any pump model and set-point curve. These formulations allow us to discuss how the characteristic of a pump and the set-point curve of the network influence the optimal number of FSPs and VSPs in energy terms. In general, the objective of this work is to determine the most suitable total number of pumps in a pumping station design and to determine the optimal pumping configuration in every flow rate, thus the consumed energy would be the minimum. Additionally, this methodology develops an expression to estimate the performance of a frequency inverter when a VSP operates at different rotational speeds. This work will be applied to different study cases, and the obtained results allow us to question several usual procedures for pumping control system. In general, it can be concluded that the number of pumps of a pumping system cannot be inferred in a simple form without a deep analysis of a control system.

scholarly journals Optimization and Enhancement of Charging Control System of Electric Vehicle Using MATLAB SIMULINK

2021 ◽  
Vol 1105 (1) ◽  
pp. 012004
Author(s):  
R H Ali Faris ◽  
A A Ibrahim ◽  
N B Mohamad wasel ◽  
M M Abdulwahid ◽  
M F Mosleh
Keyword(s):  
Control System ◽  
Electric Vehicle ◽  
Matlab Simulink ◽  
Charging Control

Automatic control for DO and pH in the activated sludge process in a coke wastewater treatment plant

1998 ◽  
Vol 37 (12) ◽  
pp. 141-148 ◽  
Author(s):  
B. K. Lee ◽  
S. W. Sung ◽  
H. D. Chun ◽  
J. K. Koo
Keyword(s):  
Wastewater Treatment ◽  
Control System ◽  
Activated Sludge ◽  
Automatic Control ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Pi Controller ◽  
Activated Sludge Process ◽  
Set Point ◽  
Coke Wastewater

The objective of this study is to develop an automatic control system for dissolved oxygen (DO) and pH of the activated sludge process in a coke wastewater treatment plant. A discrete type autotuned proportional-integral (PI) controller using an auto-regressive exogenous (ARX) model as a process model was developed to maintain the DO concentration in aerators by controlling the speed of surface aerators. Also a nonlinear pH controller using the titration curve was used to control the pH of influent wastewater. This control system was tested in a pilot scale plant. During this pilot plant experiment, there was small deviation of pH and the electric power consumption of surface aerators was reduced up to 70% with respect to the full operation when the DO set point was 2 mg/l. For real plant operation with this system, the discrete PI controller showed good tracking for set point change. The electricity saving was more than 40% of the electricity consumption when considering surface aerators. As a result of maintaining the DO constantly at the set point by the automatic control system, the fluctuation of effluent quality was decreased and overall improvement of the effluent water quality was achieved.

Modeling and Simulation of Improved Vector Control System for PMSM

2014 ◽  
Vol 548-549 ◽  
pp. 819-823
Author(s):  
Xi Juan Wang ◽  
Tao Zhou ◽  
Jing Xiao Feng ◽  
Yu Peng Pei
Keyword(s):  
Control System ◽  
Control Theory ◽  
Modeling And Simulation ◽  
Vector Control ◽  
System Model ◽  
Excellent Performance ◽  
Matlab Simulink ◽  
Ac Motor ◽  
Control System Model ◽  
Vector Control System

In the AC control system, vector control theory is very popular as it makes the AC motor achieve the performance as perfect as DC motor [1]. In the paper, the vector control theory is briefly introduced, and then a vector control system model is builded in the matlab/simulink, and the SVPWM technique is adopted. The results show that the improved vector control sytem of PMSM has a excellent performance.

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