21 | Introduction
The main task of the Ramp Block is to change the actual Set Point to the new Set Point by increasing or decreasing as
fast as the thruster is able to follow. Second task of the Ramp Block is to check whether the feedback signal matches
the Set Point. The Ramp Block also calculates the force after ramp. This is the force that is actually delivered by the
thrusters.
III.6.10 Current Calculation
The Current Block receives the thruster forces from the Ramp Block and output the current force to the Summarize
Block.
The main task of the Current Block is to calculate the average output thrust over a longer time period. When the wind
and other known external forces are subtracted from this, the current force remains.
Figure 7: Current Block
The calculation is done by filtering the thruster Set Points over longer periods of time to calculate the average force that
is required to keep the vessel in position. From this thrust all known forces are subtracted to calculate the remaining
force, which is most likely caused by water flow.
Содержание Alphatron Marine AlphaDynaPos
Страница 1: ...AlphaDynaPos Ship Automation and Navigation system Operation Manual www jrc am ...
Страница 5: ...5 Contents 4 2 Appendix B Checklist for Taking DP system into Operation 85 ...
Страница 13: ...13 Introduction III 3 System Overview DP2 Figure 2 system Overview DP2 ...
Страница 14: ...14 Introduction III 4 Sensor Overview Figure 3 Sensor Overview ...