An introduction to Kongsberg Seatrials
Scaling and tuning
July 18th, 2024
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Agenda
Thruster scaling
• Prerequisites
• Definition
• Bollard pull x free run
• When to do scaling?
Tuning
• Prerequisites
• Definition
• Projects, docking or modifications
• Low speed x High speed
29.07.2024 WORLD CLASS - through people, technology and dedication Page 2
Thruster scaling
Prerequisites
Alongside
Rudder or azimuth steering
Zero pitch
At sea
Free and covered area
Load tests
Final DP test
Thruster scaling
Topology
Thruster scaling
Definition
Kw
-10V
Command(Thrust) 10V
0V
0%
-100% 100%
Feedback
Load
-10V
Command(Steering) 10V
0V
0º
-180º 180º
Feedback
Kw
Thruster scaling
Definition
DP signal control interfaces:
RPM
Pitch
Combinator
Force
SIN/COS signal
Thruster scaling
Bollard pull x Free run
Thruster scaling
Bollard pull x Free run
Thruster scaling
Bollard pull x Free run
Thruster scaling
Definition
75% DP LIMITATION
Thruster demand
100
90
80 75%
70
FEEDBACK (%)
60
50
40
30
20
10
0
0 10 20 30 40 50 60 70 80 90 100
COMMAND (%)
Thruster scaling
When to do scaling?
Thrusters or propellers serviced or overhauled?
Any modification on the driver configuration or thruster/propeller load level?
Potentiometer aged out, worn out or modified?
Last time pot-meter or thruster/propellers were serviced?
Tuning
Prerequisites
Alongside
Operational draught
Trim zero
At sea
Scaling done
Free and covered area
Light weather conditions
Final DP test
Tuning
Definition
Tuning
Definition
Vessel stability booklet
Masses
Drags
Tons
Gains
Pivot factor
DP-RP
Tuning
Projects, docking or modifications
Retrofit
Refit
DP1 to DP2
Added equipment to deck (containers, cranes, ROV, etc)
Modification to GA and draught
Tuning
Low speed x High speed
Auto-position
Follow target
Auto-track
Auto-pilot
Questions?
WORLD CLASS
THROUGH PEOPLE, TECHNOLOGY AND DEDICATION
