A Genetic Fuzzy Controller for Vehicle Automatic Steering Control

2007 ◽  
Vol 56 (2) ◽  
pp. 529-543 ◽  
Author(s):  
Lin Cai ◽  
A. B. Rad ◽  
Wai-Lok Chan
Keyword(s):  
Fuzzy Controller ◽  
Steering Control ◽  
Automatic Steering

Anomalous Behavior of Merchant Ship Steering Systems

1970 ◽  
Vol 7 (02) ◽  
pp. 205-215 ◽  
Author(s):  
Robert Taggart
Keyword(s):  
High Speed ◽  
Mechanical Characteristics ◽  
Anomalous Behavior ◽  
Similar Response ◽  
Steering Control ◽  
Unstable Condition ◽  
Ship Steering ◽  
Merchant Ship ◽  
Automatic Steering ◽  
And Control

An unusual combination of circumstances occurring during an Atlantic crossing of a highspeed containership created a situation where the rudder, acting in response to automatic steering control demands, caused excessive ship rolling. Further investigation revealed the existence of an unstable condition due to a combination of asymmetrical hydrodynamic and mechanical characteristics and the interrelationship of ship motion and control actuation. Similar response has been noted on other high-speed vessels and is a cause for major concern in future containership operations. The elements involved in creating these conditions have been examined in detail and a plausible explanation has been evolved as to how they can combine to produce the observed results. With an understanding of the causes of this anomalous behavior it is possible to devise means for preventing its occurrence in future designs.

Energy Losses Related to Automatic Steering of Ships in Waves—Part II: Performance of Controllers Designed to a New Criterion

1983 ◽  
Vol 105 (3) ◽  
pp. 325-332 ◽  
Author(s):  
R. E. Reid ◽  
B. C. Mears ◽  
D. E. Griffin
Keyword(s):  
High Speed ◽  
Load Condition ◽  
Performance Criterion ◽  
Sensitivity Analyses ◽  
Energy Losses ◽  
Steering Control ◽  
Linear Quadratic ◽  
Linear Quadratic Gaussian ◽  
Automatic Steering ◽  
New Criterion

Minimization of energy losses associated with the steering control of modern ship types is discussed on the basis of frequency-domain sensitivity analyses and time-domain simulation studies. A high-speed containership and large tankers in the full-load condition are analyzed. A new performance criterion for minimization of steering-related propulsion losses is presented, and controllers designed to it using linear quadratic Gaussian (LQG) techniques. In the case of the containership, the resulting controller is shown to have the potential to reduce the net losses related to steering below those of the uncontrolled ship through proper use of the rudder in some conditions. While this does not seem possible for the tankers, the results indicate that a controller designed to the new criterion results in lower losses than a controller based on a form of criterion to which new autopilots for tankers are presently being designed. The implications for both autopilot and steering gear servo-design based on these results are discussed.

Energy Losses due to Limit-Cycle Behavior of a Large Tanker Under Automatic Steering Control

1983 ◽  
Vol 105 (2) ◽  
pp. 222-229 ◽  
Author(s):  
R. E. Reid ◽  
M. Youhanaie
Keyword(s):  
Limit Cycle ◽  
Computer Time ◽  
Steering System ◽  
Simulation Studies ◽  
Time Domain Simulation ◽  
Steering Control ◽  
Wide Range ◽  
Calm Water ◽  
Automatic Steering ◽  
Limit Cycle Behavior

The problem of limit-cycle behavior of a 250,000-dwt tanker in full-load and ballast conditions under automatic steering control in calm water is addressed. The approach presented involves digital computer time domain simulation studies of the yaw-sway-surge-rudder coupled motions of the ship emanating from nonlinearities in the steering system. It is shown that the amplitude of limit cycle in yaw remains, in general, within acceptable limits for open-seas navigation for a fairly wide range of autopilot bandwidths. Propulsion losses resulting from limit-cycle behavior in calm water are shown also to be, in general, small relative to the losses experienced in some conditions in waves. It is shown, however, that whereas increasing bandwidth reduces limit-cycle behavior in calm water, it can be expected to increase propulsion losses in heavy weather. The problem this poses in. design of steering gear controls and autopilot for this type of ship is discussed.

Analysis of Automatic Steering Control for Highway Vehicles with Look-down Lateral Reference Systems

1996 ◽  
Vol 26 (4) ◽  
pp. 243-269 ◽  
Author(s):  
JÜRGEN GULDNER ◽  
HAN-SHUE TAN ◽  
SATYAJIT PATWARDHAN
Keyword(s):  
Reference Systems ◽  
Steering Control ◽  
Automatic Steering
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