scholarly journals An Investigation of a Nonlinear Fuel Oil Viscosity and Temperature Control System for Ships

2019 ◽  
Vol 95 ◽  
pp. 03006
Author(s):  
Zhuohang Ye ◽  
Xiaobing Mao ◽  
Hai Huang ◽  
Xianzhen Liu
Keyword(s):  
Heat Transfer ◽  
Control System ◽  
Sliding Mode ◽  
Variable Structure ◽  
Fuel Oil ◽  
Temperature Control System ◽  
Transfer Model ◽  
Oil Viscosity ◽  
Single Input ◽  
Sliding Mode Variable Structure

In this paper, the differential equation of the fuel oil viscosity and temperature control system was derived, according to the working processes and principles of the heating of heavy oil in ocean vessels. By analyzing the characteristics of the heat transfer model, a multi-input coupling nonlinear heat transfer model was developed, in which the temperatures at the inlet and the outlet of the heavy oil heater were used as the state variables, while the openings of the regulating valve of the mixed oil tank and the steam flow rate regulating valve of the heater were used as the control inputs. This model can be decomposed into a single-input nonlinear system and single-input second-order linear system for further investigation, and the sliding mode variable structure controller can then be solved by performing linear reductions on the nonlinear model. Finally, using KING VIKW software, experiments were performed in order to examine the controlling performances of the PID and sliding mode variable structure ( SMVS ) controller respectively. The results show that the sliding mode variable structure controller exhibits a series of superiorities, which mainly include a small overshoot, fast response and strong anti-interference capability.

Application Analysis of the Fuel Viscosity and Temperature Control System Based on the Sliding Mode Theory

2012 ◽  
Vol 503-504 ◽  
pp. 1116-1119
Author(s):  
Zhuan Zhao Liu ◽  
De Shang Chang ◽  
Xin Jian Liu
Keyword(s):  
Control System ◽  
Temperature Control ◽  
Sliding Mode ◽  
Variable Structure Control ◽  
Variable Structure ◽  
Fuel Oil ◽  
Temperature Control System ◽  
Structure Control ◽  
Heat Transfer Theory ◽  
Sliding Mode Variable Structure

With the shortage of the petroleum resources day by day, the fuel oil price is becoming higher and higher. The ship companies want to use the heavy diesel oil and inferior fuel with lower price for the marine diesel. Temperature is a variable with great inertia. Using the PID control algorithm, which will lead to the consequence of over correction in the controlling process, the advantage of sliding mode variable structure control is the small over correction. In this paper, based on thermodynamics and heat transfer theory, the mathematical model of temperature control system is built, the sliding mode movement equation and the sliding mode variable structure controller is obtained. This makes the application of temperature control take the advantage of sliding mode variable structure control.

scholarly journals A Speed Control Method for Underwater Vehicle under Hydraulic Flexible Traction

2015 ◽  
Vol 2015 ◽  
pp. 1-16
Author(s):  
Yin Zhao ◽  
Ying-kai Xia ◽  
Ying Chen ◽  
Guo-Hua Xu
Keyword(s):  
Control System ◽  
Control Theory ◽  
Control Method ◽  
Sliding Mode ◽  
Variable Structure ◽  
Speed Control ◽  
Underwater Vehicle ◽  
Vehicle Speed ◽  
Sliding Mode Variable Structure ◽  
Traction System

Underwater vehicle speed control methodology method is the focus of research in this study. Driven by a hydraulic flexible traction system, the underwater vehicle advances steadily on underwater guide rails, simulating an underwater environment for the carried device. Considering the influence of steel rope viscoelasticity and the control system traction structure feature, a mathematical model of the underwater vehicle driven by hydraulic flexible traction system is established. A speed control strategy is then proposed based on the sliding mode variable structure of fuzzy reaching law, according to nonlinearity and external variable load of the vehicle speed control system. Sliding mode variable structure control theory for the nonlinear system allows an improved control effect for movements in “sliding mode” when compared with conventional control. The fuzzy control theory is also introduced, weakening output chattering caused by the sliding mode control switchover while producing high output stability. Matlab mathematical simulation and practical test verification indicate the speed control method as effective in obtaining accurate control results, thus inferring strong practical significance for engineering applications.

scholarly journals Cooperative control method of multi-missile formation under uncontrollable speed

2021 ◽  
Vol 39 (2) ◽  
pp. 249-257
Author(s):  
Zhenlin Zhang ◽  
Ke Zhang ◽  
Meibo Lyu ◽  
Minghao Wang ◽  
Zhiguo Han
Keyword(s):  
Control System ◽  
Control Theory ◽  
Coordinate System ◽  
Relative Position ◽  
Formation Control ◽  
Sliding Mode ◽  
Variable Structure ◽  
Dynamic Surface Control ◽  
Dynamic Surface ◽  
Sliding Mode Variable Structure

Under the missile speed is uncontrollable, a design method of multi-missile formation flight controller based on the sliding mode variable structure control theory and adaptive dynamic surface control theory is proposed. Firstly, according to the relative position of the leader and the follower in the inertial frame, the tracking error model for the relative position and the expected relative position between the leader and the follower is obtained, and the multi-missile formation control system in the inertial coordinate system is obtained. Secondly, in order to obtain the expression of the formation control system in the ballistic coordinate system, the acceleration of the missile in the ballistic coordinate system is converted to the inertial coordinate system. Combining with the tracking of the relative position and the desired relative position of the leader and the followers, we can obtain the simplified error model for the formation control system. Then the sliding mode variable structure control theory and the adaptive dynamic surface control theory are used to design the formation controllers for the leader and follower missiles respectively, and the stability of the present controller is analysed via the Lyapunov stability theory. Finally, the designed formation controllers are used for the leader and follower missiles to simulate the parameters. The results verify the feasibility and effectiveness of the present method.

Design and Simulation for Electro-Hydraulic Proportional Tension Control System

2015 ◽  
Vol 779 ◽  
pp. 250-255
Author(s):  
Yong Liang Liu ◽  
Rui Bo Yuan ◽  
Ze Yin Shan
Keyword(s):  
Control System ◽  
Sliding Mode ◽  
Variable Structure ◽  
Tension Control ◽  
Time Varying ◽  
Simulink Simulation ◽  
Sliding Mode Variable Structure ◽  
Tension Control System ◽  
Better Than ◽  
Lead Sheet

Sliding Mode Variable Structure(SMC) based on index approaching rate to control tension is used in this paper,because the lead sheet uncoiler electro-hydraulic tension control system parameters exist many problems,such as:time-varying,coupling multiple interference and so on.Through Matlab/Simulink simulation tool to make simulationanalysis for the electro-hydraulic proportional tensio control model,and comparing with PIDcontrol.The simulation results shows that SMC control is better than PID control.The system can be strongly adaped to parameters time-varying interference and has strong robustness.

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