A Steering Control System to Minimize Propulsion Losses of High-Speed Containerships—Part I: System Dynamics

1982 ◽  
Vol 104 (1) ◽  
pp. 1-8 ◽  
Author(s):  
R. E. Reid ◽  
J. W. Moore
Keyword(s):  
Control System ◽  
Modeling And Simulation ◽  
Time Domain ◽  
High Speed ◽  
Steering System ◽  
Performance Criteria ◽  
Domain Modeling ◽  
Added Resistance ◽  
Steering Control ◽  
Time Domain Modeling

The problem of steering control of high-speed containerships to minimize propulsion losses is addressed. The approach involves time domain modeling and simulation. A dynamic model of a containership and steering system in a seaway is constructed. Performance criteria for added resistance associated with yawing and steering are discussed. Losses resulting from yawing of the uncontrolled ship in heavy weather are shown by simulation to be significant. The results presented form a basis for design of a controller to minimize steering related losses.

Time-Domain Modeling and Simulation of Partial Discharge on Medium-Voltage Cables by Vector Fitting Method

2014 ◽  
Vol 50 (2) ◽  
pp. 993-996 ◽  
Author(s):  
Tang Ming ◽  
Sun Jianyang ◽  
Guo Jianzhao ◽  
Li Hongjie ◽  
Zhang Wei ◽  
...  
Keyword(s):  
Modeling And Simulation ◽  
Time Domain ◽  
Partial Discharge ◽  
Domain Modeling ◽  
Medium Voltage ◽  
Vector Fitting ◽  
Fitting Method ◽  
Time Domain Modeling

A Steering Control System to Minimize Propulsion Losses of High-Speed Containerships—Part II: Controller Design

1982 ◽  
Vol 104 (1) ◽  
pp. 9-18 ◽  
Author(s):  
R. E. Reid ◽  
J. W. Moore
Keyword(s):  
High Speed ◽  
Linear Models ◽  
Controller Design ◽  
Weather Conditions ◽  
Adaptive Controller ◽  
Frequency Domain Analysis ◽  
Domain Modeling ◽  
Steering Control ◽  
The Face ◽  
Time Domain Modeling

An approach to design of steering controls for high-speed containerships to minimize propulsion losses is described. It involves time domain modeling and simulation, frequency domain analysis, and control structure investigation. A design process based on the use of linear modern and classical control techniques with locally linear models to minimize propulsion losses at important design conditions on the ship’s operating envelope is discussed. An adaptive controller to provide envelope-wide control in the face of changing environmental conditions and ship characteristics is described. Results from simulations and full-scale sea tests are summarized. On the basis of these preliminary results it appears that the adaptive controller works well under different speed and weather conditions and offers the potential for a reduction in propulsion losses over an existing PID autopilot.

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