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Motion Monitor, relying on the MRU motion reference unit, collects six degrees of freedom motion data of the hull: Roll, Pitch, Yaw, Heave, Sway, and Surge. It is a standard safety monitoring system for offshore engineering vessels, wind power maintenance vessels, drilling platforms, research vessels, and large commercial ships. Its core functions are divided into six categories: real-time monitoring, safety early warning, operation assistance, hull structure protection, data recording and analysis, and system linkage.
I. Real-time Measurement and Visualization of Six Degrees of Freedom Motion (Basic Core)
Continuous Acquisition of Attitude, Displacement, and Acceleration in All Dimensions
Angle: Roll/Pitch amplitude, period, angular velocity; Yaw turning rate
Vertical: Local heave displacement of deck, helicopter platform, boarding ramp, and crane hook (multi-point custom monitoring possible)
Plane: Hull fore-and-aft sway, lateral sway offset, and three-axis acceleration
Angular Motion (Attitude)
Roll: Hull lateral sway angle, period, and angular velocity
Pitch Pitch: The angle and period of the ship’s bow and stern.
Yaw: The yaw of the bow (bow sway).
Linear Motion (Displacement/Heave):
Heave: The vertical displacement, velocity, and acceleration of the ship (the most critical parameter for offshore operations).
Surge: The horizontal drift of the ship from front to back.
Sway: The horizontal drift of the ship from side to side.
Additional Outputs: Instantaneous acceleration, motion period, peak value, and RMS root mean square statistical values at each point, displayed in real-time on the interface.
Human-Machine Interface: Real-time curves, numerical dashboard, and traffic light risk indicators; supports individual display of multiple points (boarding area, helicopter deck, crane operation area); automatically calculates the effective value, peak value, and average period of motion RMS, replacing the crude method of judging risk solely by wave height.
Arm Length Compensation Algorithm: Sensors do not need to be installed at the ship’s center of gravity; the software automatically compensates for the distance between the installation location and the operation point, accurately calculating the actual motion amplitude at any point on the deck. II. Over-Limit Audible and Visual Alarms and Safety Risk Warnings (Core Safety Functions)
Customizable safety thresholds for various motion parameters, with tiered alarms for exceeding limits: Warning (yellow light), Danger Alarm (red light + buzzer).
Typical Alarm Scenarios
Personnel Transfer Safety Alarm (Wind Power Maintenance Vessel, Supply Vessel)
An alarm is triggered when the relative motion between the two ends of the boarding ramp exceeds the limit, prohibiting personnel from transferring across the vessel to prevent falls and injuries; outputting a motion risk index for intuitive assessment of the operational window.
Helicopter Landing Deck Alarm: Monitors deck heave and roll amplitude; an alarm is immediately triggered if the amplitude exceeds the helicopter landing envelope, prohibiting aircraft takeoff and landing to avoid collisions and overturning accidents.
Crane/Lifting Operation Protection: An alarm is triggered when the lifting point heave is too large, activating the active heave compensation winch to prevent cargo from colliding with the hull, cable breakage, or cargo falling into the water.
Severe Sea State Alarm: When roll is severe, the captain is reminded to reduce speed and adjust course to reduce roll; preventing large-angle roll from causing cargo displacement and equipment tipping over.
Mooring/Awake Monitoring: Monitors continuous swaying of the hull while moored at the dock, anticipating cable overload and fender damage, and adjusting cable tension in advance.
III. Key Offshore Operation Auxiliary Decision-Making Functions
Extended Safe Operating Window: Directly measures the actual hull response motion without relying on predicted wave height, extending boarding, hoisting, and take-off/landing operation time under the same sea conditions, improving vessel operational efficiency.
Anti-roll Device Linkage Control: Outputs roll rate and angle data to anti-roll fins and anti-roll tanks, providing feedforward control signals to suppress ship roll in advance, reducing crew seasickness and improving sailing comfort.
DP Dynamic Positioning Assistance: Outputs real-time six-axis hull motion data to the DP system, correcting positioning filtering algorithms, improving platform positioning accuracy, and ensuring stable drilling and underwater ROV operations.
Marine Surveying Equipment Motion Compensation: Provides attitude data to multibeam echo sounders, side-scan sonar, and marine exploration equipment, correcting survey point errors and ensuring accurate seabed measurement data.
Marine Surveying Equipment Motion Compensation: Provides attitude data to multibeam echo sounders, side-scan sonar, and marine exploration equipment, correcting survey point errors and ensuring accurate seabed measurement data. ROV/Underwater Equipment Deployment and Retrieval Monitoring: Real-time calculation of the relative motion between the mother ship and the underwater robot to avoid collision risks during deployment and retrieval.
IV. Hull Structural Health and Fatigue Monitoring (Ocean-going/Heavy Offshore Vessels)
Wave Load Linkage Analysis: Fusion of motion data with hull stress, bending moment, and torque sensor data to calculate the instantaneous impact load of waves on the hull.
Cumulative Hull Fatigue Life Statistics: Long-term recording of the duration of severe rolling and heave conditions, using rainflow counting to statistically analyze stress cycles, assessing the fatigue life of the hull structure, planning dry-docking repairs in advance, and preventing hull cracks and structural failure.
Extreme Sea State Recording: Automatically captures peak motion data under giant waves as a basis for hull structural design verification and classification society inspection.
V. Data Storage, Playback, and Post-Event Analysis Management
High-Frequency Continuous Recording: Sampling and storing all motion time-series data at up to 10Hz, long-term storage of historical operating conditions, storage duration limited only by hard drive capacity (KONGSBERG).
Complete Data Export: Supports binary to Excel and Matlab-readable formats for project review, sea state statistics, and ship performance simulation.
Working Condition Replay Function: Replays the complete motion curve after an accident, equipment damage, or personnel emergency, facilitating accident tracing and liability investigation.
Long-Term Statistical Reports: Automatically calculates motion duration, executable days, and over-limit alarm frequency under different sea states throughout the year, used for fleet operation assessment and route optimization.
VI. Multi-System Communication Linkage Expansion Functions
Multi-Standard Protocol Output: Supports NMEA, Ethernet TCP/IP, serial port, Modbus, and CAN bus, allowing integration with engine room monitoring, navigation, DP, crane, and helicopter management systems.
Multi-Terminal Synchronous Display: Real-time motion data is synchronized between the bridge, control room, deck operations control console, and captain’s terminal, enabling all personnel to monitor operational risks.
Optional Weather Fusion: Integrates with wind speed, wave height, and current direction sensors to jointly display the complete environmental and ship response conditions, assisting the captain in comprehensive judgment.
VII. Hull Structure Fatigue Monitoring (Extended Functionality for Offshore Engineering/Large Transport Vessels)
Equipped with hull stress sensors, motion data is linked with hull load analysis:
Wave Load Correlation: Roll and heave data are matched with hull bending moment, torsional moment, and shear force.
Fatigue Life Accumulation: Rainflow counting method is used to statistically analyze alternating stress cycles, calculating the hull’s fatigue life and remaining structural life.
Extreme Sea State Recording: Records hull overload events under extremely large waves, guiding the vessel to avoid severe sea areas and reducing hull damage.
VIII. Multi-System Signal Interaction and Linkage Control
Features standardized marine interfaces for Ethernet/RS485/Modbus, enabling interoperability among all shipboard devices:
Provides real-time attitude monitoring for the DP dynamic positioning system, improving the vessel’s positioning accuracy and offsetting wave drift.
Offshore Crane Heave Compensation System: Real-time Heave data feedback eliminates the lifting device’s vertical sway, protecting cargo and equipment.
Multi-beam/ Seismic exploration equipment: Motion compensation correction of depth sounding and mapping data eliminates measurement errors caused by ship roll.
Helicopter deck lighting interlock: Automatically shuts off landing and takeoff indicator lights and locks deck safety railings when exceeding limits.
Synchronous display across multiple terminals (central control, bridge, deck local terminals) allows crew, captain, and deckhands to view status simultaneously.
IX. Scenario-Specific Application Functions
1) Offshore Wind Turbine Maintenance Vessel (CTV)
Navigation phase: Real-time motion trend analysis optimizes speed and reduces rolling, minimizing seasickness for crew.
Wind turbine boarding phase: Continuously calculates transfer index; exceeding limits prohibits personnel from boarding, significantly reducing the risk of falls.
2) Drilling Vessel / Platform Supply Vessels
Riser and BOP Motion Monitoring: Prevents excessive stretching and collisions of pipelines.
Early Warning of Severe Sea Conditions: Allows for timely cessation of drilling and tripping operations.
3) Crane Pipelaying Vessels
Independent Motion Monitoring of Crane Bases: Protects large marine engineering components and submarine cables.
Real-time Attitude Compensation for Pipelaying Operations: Prevents pipeline bending and damage.
4) Helicopter Platform Vessels (FPSO, Drilling Platforms)
Dedicated Deck Motion Monitoring System: Mandatory compliance equipment for civil aviation/maritime helicopters, meeting maritime safety regulations for takeoff and landing.
5) Container/Tankers (Ocean-going Merchant Ships)
Monitoring of Ship Sway During Ocean Voyages: Predicts cargo displacement risks during ocean voyages.
Port Mooring Monitoring: Adjusts mooring lines in advance when swells are excessive to prevent ship collisions with docks.
X. Operation and Maintenance & Diagnostic Functions
MRU Sensor self-diagnosis: Real-time monitoring of sensor faults, signal loss, and offset, with fault pop-up alarms.
Multi-point sensor lever arm compensation: Supports off-center sensor installation; software corrects position errors to ensure measurement accuracy.
Customizable human-machine interface: Freely configure monitoring points, display curves, and alarm thresholds to adapt to different ship operation needs.
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