Complete TwinShip ontology for digital twins of ships. This is an aggregate ontology that imports the base foundation (twinship-base) plus all domain modules. Use this ontology to get the complete TwinShip conceptual model including vessels and weather. For modular development, import twinship-base and specific modules instead. ## Modeling Approach - Restriction-Based Design The TwinShip ontology follows a restriction-based modeling approach using OWL class restrictions (owl:Restriction with owl:someValuesFrom, etc.) rather than simple rdfs:domain and rdfs:range assertions. This is the recommended OWL engineering practice as it provides: - **Precise Semantics**: Restrictions state that instances of a class CAN have certain properties, without forcing classification - **Avoids Unintended Inferences**: Using rdfs:domain would cause any entity using a property to be automatically classified as a member of the domain class - **Flexible Modeling**: Multiple classes can use the same property with different constraints - **OWL Best Practice**: Aligns with OWL 2 design patterns and enables proper use of reasoners ## Visualization and Documentation Most ontology visualization and documentation tools (WIDOCO, WebVOWL) were designed for RDFS-style ontologies and provide limited support for OWL restriction patterns. They expect simple rdfs:domain and rdfs:range assertions to generate diagrams. To address this limitation while maintaining correct OWL semantics, we maintain two versions: 1. **Source Version** (in model/ folder): Uses proper OWL restrictions - this is the authoritative version for reasoning and semantic operations 2. **Visualization Version** (auto-generated): A simplified version with explicit rdfs:domain/rdfs:range assertions extracted from restrictions, used solely for documentation generation Both versions are kept synchronized through automated scripts.
TwinShip Ontology
Complete TwinShip ontology for digital twins of ships. This is an aggregate ontology that imports the base foundation (twinship-base) plus all domain modules. Use this ontology to get the complete TwinShip conceptual model including vessels and weather. For modular development, import twinship-base and specific modules instead. Modeling Approach Note: The TwinShip ontology follows a restriction-based modeling approach using OWL class restrictions rather than simple rdfs:domain and rdfs:range assertions. This is the recommended OWL engineering practice as it provides precise semantics and avoids unintended inferences that would occur with rdfs:domain (where any entity using a property would automatically be classified as a member of the domain class). Since most documentation and visualization tools (WIDOCO, WebVOWL) provide limited support for rendering OWL restrictions, we maintain two versions: 1. Source Ontology (This File): Uses proper OWL restrictions - this is the authoritative version for reasoning and semantic operations. 2. Visualization Version (Auto-Generated): A simplified version with explicit rdfs:domain/rdfs:range assertions extracted from restrictions, used solely for generating documentation and diagrams. Both versions are kept synchronized through automated scripts. See twinship-base for detailed explanation of this modeling practice.
Alternative label for the ontology resource.
An alternative lexical label for a resource.
A notation, such as a code or identifier, used to uniquely identify a concept.
Relates two inanimate physical objects that are directly connected.
Relates a component to the ship or system it is part of.
Relates an engine or system to the fuel it consumes.
Relates a ship or system to a component that is part of it.
Relates an entity to its owner (typically an Organization).
Parent property for all TwinShip-specific object properties.
Parent property for all TwinShip-specific datatype properties. All measurement and data properties should be subproperties of this.
Air Lubrication System power in kilowatts. Value -1 indicates unknown.
Air Lubrication System power reduction efficiency as a percentage. Value -1 indicates unknown.
twinship ALS power reduction efficiency percentage
Ammonia fuel cell power capacity in kilowatt-hours. Value -1 indicates unknown.
Auxiliary load hotel load power demand in kilowatts. Value -1 indicates unknown.
Auxiliary load ship services power demand in kilowatts. Value -1 indicates unknown.
twinship AUXLD ship services power in kW
Diesel Oil mode for auxiliary engine. Values: 1 (active), 0 (inactive), -1 (unknown).
Net fuel consumption rate for auxiliary engine in kg per hour. Value -1 indicates unknown.
twinship auxiliary fuel rate mass net kg per hr
Boiler fuel mode indicator. Values: 1 (active), 0 (inactive), -1 (unknown).
Boiler BLR fuel mode for boiler system. Inherits semantics from twBLRFuelMode.
Boiler Diesel Oil input temperature in degrees Celsius. Value -1 indicates unknown.
twinship boiler DO temperature in degrees C
Boiler DO temperature return in degrees Celsius. Value -1 indicates unknown.
twinship boiler DO temperature return in degrees C
Boiler Diesel Oil volume flow in litres per hour. Value -1 indicates unknown.
Boiler DO volume return in litres per hour. Value -1 indicates unknown.
twinship boiler DO vol return in litre per hr
Boiler emergency Diesel Oil mode. Values: 1 (active), 0 (inactive), -1 (unknown).
Boiler fuel temperature in degrees Celsius. Value -1 indicates unknown.
Boiler fuel volume flow in litres per hour. Value -1 indicates unknown.
Indicates if boiler is using Marine Gas Oil. Values: 1 (yes), 0 (no), -1 (unknown).
Boiler Marine Gas Oil mass flow in kg per hour. Value -1 indicates unknown.
Boiler fuel mass flow in kg per hour. Value -1 indicates unknown.
Maximum boiler power output in kilowatts. Value -1 indicates unknown.
Maximum boiler motor speed in revolutions per minute. Value -1 indicates unknown.
twinship boiler speed max in rev per min
Bow thruster BLR fuel mode. Values: 1 (active), 0 (inactive), -1 (unknown).
Bow thruster Diesel Oil input temperature in degrees Celsius. Value -1 indicates unknown.
twinship bow thruster DO temperature in degrees C
Bow thruster Diesel Oil volume flow in litres per hour. Value -1 indicates unknown.
twinship bow thruster DO vol in litre per hr
Bow thruster emergency Diesel Oil mode. Values: 1 (active), 0 (inactive), -1 (unknown).
Bow thruster fuel temperature in degrees Celsius. Value -1 indicates unknown.
twinship bow thruster fuel temp in degrees C
Bow thruster fuel volume flow in litres per hour. Value -1 indicates unknown.
twinship bow thruster fuel vol litre per hr
Indicates if bow thruster is using Marine Gas Oil. Values: 1 (yes), 0 (no), -1 (unknown).
Bow thruster Marine Gas Oil mass flow in kg per hour. Value -1 indicates unknown.
twinship bow thruster MGO mass in kg per hr
Bow thruster fuel mass flow in kg per hour. Value -1 indicates unknown.
Maximum bow thruster power output in kilowatts. Value -1 indicates unknown.
Maximum bow thruster motor speed in revolutions per minute. Value -1 indicates unknown.
twinship bow thruster speed max in rev per min
Common Diesel Oil mode across systems. Values: 1 (active), 0 (inactive), -1 (unknown).
A code representing the type of bunkered fuel.
Common fuel mode indicator across systems. Values: 1 (active), 0 (inactive), -1 (unknown).
Composite exhaust gas boiler BLR fuel mode. Values: 1 (active), 0 (inactive), -1 (unknown).
twinship composite exhaust gas boiler BLR fuel mode
Composite exhaust gas boiler Diesel Oil input temperature in degrees Celsius. Value -1 indicates unknown.
twinship composite exhaust gas boiler DO temperature in degrees C
Composite exhaust gas boiler Diesel Oil volume flow in litres per hour. Value -1 indicates unknown.
twinship composite exhaust gas boiler DO vol in litre per hr
Composite exhaust gas boiler emergency Diesel Oil mode. Values: 1 (active), 0 (inactive), -1 (unknown).
twinship composite exhaust gas boiler emergency DO mode
Composite exhaust gas boiler fuel temperature in degrees Celsius. Value -1 indicates unknown.
twinship composite exhaust gas boiler fuel temp in degrees C
Composite exhaust gas boiler fuel volume flow in litres per hour. Value -1 indicates unknown.
twinship composite exhaust gas boiler fuel vol litre per hr
Indicates if composite exhaust gas boiler is using Marine Gas Oil. Values: 1 (yes), 0 (no), -1 (unknown).
twinship composite exhaust gas boiler MGO in use
Composite exhaust gas boiler Marine Gas Oil mass flow in kg per hour. Value -1 indicates unknown.
twinship composite exhaust gas boiler MGO mass in kg per hr
Composite exhaust gas boiler fuel mass flow in kg per hour. Value -1 indicates unknown.
twinship composite exhaust gas boiler mass in kg per hr
Maximum composite exhaust gas boiler power output in kilowatts. Value -1 indicates unknown.
twinship composite exhaust gas boiler power max in kW
Maximum composite exhaust gas boiler motor speed in revolutions per minute. Value -1 indicates unknown.
twinship composite exhaust gas boiler speed max in rev per min
DC bus maximum current. Value -1 indicates unknown.
DC bus maximum voltage. Value -1 indicates unknown.
DC bus minimum voltage. Value -1 indicates unknown.
DC bus nominal voltage. Value -1 indicates unknown.
Diesel Oil mode indicator. Values: 1 (active), 0 (inactive), -1 (unknown).
Diesel Oil temperature input in degrees Celsius. See also twDOTemperatureRetInDegC for return temperature. Value -1 indicates unknown.
Diesel Oil volume input flow in litres per hour. See also twDOVolRetInLitrePerHr for return volume. Value -1 indicates unknown.
Dynamic Wing power in kilowatts. Value -1 indicates unknown.
Dynamic Wing power reduction efficiency as a percentage. Value -1 indicates unknown.
twinship DW power reduction efficiency percentage
Maximum diesel engine power output in kilowatts. Value -1 indicates unknown.
Diesel engine rotational speed in revolutions per minute. Value -1 indicates unknown.
twinship diesel engine speed in rev per min
Maximum vessel displacement in metric tons. Value -1 indicates unknown.
Electric motor power capacity in megawatt-hours. Value -1 indicates unknown.
Electric motor shaft rotational speed in revolutions per minute. Value -1 indicates unknown.
Electric motor shaft torque in kilonewtons. Value -1 indicates unknown.
Energy Storage System C-rate (charge/discharge rate relative to capacity). Value -1 indicates unknown.
Energy Storage System total capacity in megawatt-hours. Value -1 indicates unknown.
Energy Storage System rated cycle life (number of charge/discharge cycles). Value -1 indicates unknown.
Energy Storage System maximum depth of discharge as a percentage. Value -1 indicates unknown.
twinship ESS depth of discharge percentage
Energy Storage System total volume in cubic metres. Value -1 indicates unknown.
Energy Storage System total weight in kilograms. Value -1 indicates unknown.
Electrical efficiency as a percentage. Value -1 indicates unknown.
twinship electrical efficiency percentage
Emergency Diesel Oil mode flag. Values: 1 (active), 0 (inactive), -1 (unknown).
Emergency diesel generator BLR fuel mode. Values: 1 (active), 0 (inactive), -1 (unknown).
twinship emergency diesel generator BLR fuel mode
Emergency diesel generator Diesel Oil input temperature in degrees Celsius. Value -1 indicates unknown.
twinship emergency diesel generator DO temperature in degrees C
Emergency diesel generator Diesel Oil volume flow in litres per hour. Value -1 indicates unknown.
twinship emergency diesel generator DO vol in litre per hr
Emergency diesel generator emergency Diesel Oil mode. Values: 1 (active), 0 (inactive), -1 (unknown).
twinship emergency diesel generator emergency DO mode
Emergency diesel generator fuel temperature in degrees Celsius. Value -1 indicates unknown.
twinship emergency diesel generator fuel temp in degrees C
Emergency diesel generator fuel volume flow in litres per hour. Value -1 indicates unknown.
twinship emergency diesel generator fuel vol litre per hr
Indicates if emergency diesel generator is using Marine Gas Oil. Values: 1 (yes), 0 (no), -1 (unknown).
twinship emergency diesel generator MGO in use
Emergency diesel generator Marine Gas Oil mass flow in kg per hour. Value -1 indicates unknown.
twinship emergency diesel generator MGO mass in kg per hr
Emergency diesel generator fuel mass flow in kg per hour. Value -1 indicates unknown.
twinship emergency diesel generator mass in kg per hr
Maximum emergency diesel generator power output in kilowatts. Value -1 indicates unknown.
twinship emergency diesel generator power max in kW
Maximum emergency diesel generator speed in revolutions per minute. Value -1 indicates unknown.
twinship emergency diesel generator speed max in rev per min
Emergency mass flow in kg per hour. Value -1 indicates unknown.
Emergency mass return flow in kg per hour. Value -1 indicates unknown.
twinship emergency mass return in kg per hr
Frequency converter output frequency in hertz. Value -1 indicates unknown.
Frequency converter voltage in volts. Value -1 indicates unknown.
Maximum flow rate in kilograms per hour. Value -1 indicates unknown.
The maximum pumping rate of the fuel being supplied by the bunker barge. Measurement is cubic meters per hour, or metric tonne per hour. (Numeric field, integer).
Fuel consumption rate in metric tons per hour. Value -1 indicates unknown.
twinship fuel consumption rate in MT per hr
Fuel consumed by Main Engine, measured in metric tons since last reporting.
Total fuel consumption in metric tons. Value -1 indicates unknown.
Density of fuel at 15 degrees Celsius, measured in metric tons per cubic meter.
Fuel density at 15 degrees Celsius in kilograms per litre. Value -1 indicates unknown.
twinship fuel density grav 15C kg per litre
Methane (CH4) emission factor in grams per kilogram of fuel. Value -1 indicates unknown.
twinship fuel emission factor CH4 in g per kg of fuel
Carbon dioxide (CO2) emission factor in grams per kilogram of fuel. Value -1 indicates unknown.
twinship fuel emission factor CO2 in g per kg of fuel
Nitrous oxide (N2O) emission factor in grams per kilogram of fuel. Value -1 indicates unknown.
twinship fuel emission factor N2O in g per kg of fuel
Maximum fuel flow temperature in degrees Celsius. Value -1 indicates unknown.
twinship fuel flow temperature max in degrees C
Fuel Lower Heating Value in kilojoules per kilogram. Value -1 indicates unknown.
Fuel sulphur content as a percentage. Value -1 indicates unknown.
Fuel temperature in degrees Celsius. Value -1 indicates unknown.
Fuel volume flow in litres per hour. Value -1 indicates unknown.
Gate Rudder System power in kilowatts. Value -1 indicates unknown.
Gate Rudder System power reduction efficiency as a percentage. Value -1 indicates unknown.
twinship GRS power reduction efficiency percentage
Gearbox efficiency. Value -1 indicates unknown.
Gearbox gear ratio as a string (e.g., '3.5:1'). Value '-1' indicates unknown.
Indicates if gearbox has shaft generator. Values: 1 (yes), 0 (no), -1 (unknown).
Generator output frequency. Value -1 indicates unknown.
The measure of the production of a generator not used for propulsion, in kilowatt hours since last reporting.
Maximum generator power output in kilowatts. Value -1 indicates unknown.
Generator rotational speed in revolutions per minute. Value -1 indicates unknown.
Generator output voltage in volts. Value -1 indicates unknown.
The pressure of the air supplied to the main engine for combustion or other purposes, measured at the designated point in the air system.
Maximum inlet air pressure in hectopascals. Value -1 indicates unknown.
The measure of air temperature in degrees Celsius at ship location.
Inlet air temperature in degrees Celsius. Value -1 indicates unknown.
twinship inlet air temperature in degrees C
Maximum inlet air temperature in degrees Celsius. Value -1 indicates unknown.
twinship inlet air temperature max in degrees C
Maximum LT cooling seawater 1 temperature in degrees Celsius. Value -1 indicates unknown.
twinship LT cooling seawater 1 temperature max in degrees C
Maximum LT cooling seawater 2 temperature in degrees Celsius. Value -1 indicates unknown.
twinship LT cooling seawater 2 temperature max in degrees C
Maximum low-temperature cooling seawater temperature in degrees Celsius. Value -1 indicates unknown.
twinship LT cooling seawater temperature max in degrees C
Indicates if Marine Gas Oil is in use. Values: 1 (yes), 0 (no), -1 (unknown).
Marine Gas Oil mass flow in kilograms per hour. Value -1 indicates unknown.
The temperature of the cooling water circulating through the main engine, measured at the designated point in the cooling system.
Main engine cooling water temperature in degrees Celsius. Value -1 indicates unknown.
twinship ME cooling water temperature in degrees C
Maximum main engine cooling water temperature in degrees Celsius. Value -1 indicates unknown.
twinship ME cooling water temperature max in degrees C
On Shore Power capacity in kilowatt-hours. Value -1 indicates unknown.
On Shore Power connection time in hours. Value -1 indicates unknown.
Maximum power output in kilowatts. Value -1 indicates unknown.
Total propulsion power in kilowatts. Value -1 indicates unknown.
Maximum pressure in hectopascals. Value -1 indicates unknown.
Number of propeller blades. Value -1 indicates unknown.
Propeller diameter in millimetres. Value -1 indicates unknown.
Propeller efficiency (0-1 ratio). Value -1 indicates unknown.
Propeller expanded area ratio as a percentage. Value -1 indicates unknown.
twinship propeller expanded area ratio percentage
Propeller hub diameter ratio (hub diameter / propeller diameter). Typical values around 0.16-0.20. Value -1 indicates unknown.
Propeller pitch to diameter ratio. Value -1 indicates unknown.
Maximum propeller pitch as a percentage of design pitch. Value -1 indicates unknown.
twinship propeller pitch max in percentage
Propeller skew angle in degrees. Value -1 indicates unknown.
Rudder angle in degrees. Value -1 indicates unknown.
SCR catalyst volume in cubic metres. Value -1 indicates unknown.
SCR exhaust gas flowrate in kilograms per hour. Value -1 indicates unknown.
twinship SCR exhaust gas flowrate in kg per hr
SCR NOx reduction efficiency. Value -1 indicates unknown.
SCR operating temperature in degrees centigrade. Value -1 indicates unknown.
The temperature of the scavenger air in the air receiver of the main engine, measured at the designated point in the scavenger air system.
Acavenger air receiver temperature in degrees Celsius. Value -1 indicates unknown.
twinship scavenger air rec temperature in degrees C
Main Engine Scavenger Air Receiver Temperature
Maximum scavenger air receiver temperature in degrees Celsius. Value -1 indicates unknown.
twinship scavenger air rec temperature max in degrees C
Shaft generator BLR fuel mode. Values: 1 (active), 0 (inactive), -1 (unknown).
Shaft generator Diesel Oil input temperature in degrees Celsius. Value -1 indicates unknown.
twinship shaft generator DO temperature in degrees C
Shaft generator Diesel Oil volume flow in litres per hour. Value -1 indicates unknown.
twinship shaft generator DO vol in litre per hr
Shaft generator emergency Diesel Oil mode. Values: 1 (active), 0 (inactive), -1 (unknown).
twinship shaft generator emergency DO mode
The temperature of the fuel bunkers in the bunker tanker / supplying barge. Measured in degree Celsius. (Numeric value with two decimals).
Shaft generator fuel temperature in degrees Celsius. Value -1 indicates unknown.
twinship shaft generator fuel temp in degrees C
Shaft generator fuel volume flow in litres per hour. Value -1 indicates unknown.
twinship shaft generator fuel vol litre per hr
Indicates if shaft generator is using Marine Gas Oil. Values: 1 (yes), 0 (no), -1 (unknown).
Shaft generator Marine Gas Oil mass flow in kg per hour. Value -1 indicates unknown.
twinship shaft generator MGO mass in kg per hr
Shaft generator fuel mass flow in kg per hour. Value -1 indicates unknown.
twinship shaft generator mass in kg per hr
Maximum shaft generator power output in kilowatts. Value -1 indicates unknown.
twinship shaft generator power max in kW
Maximum shaft generator speed in revolutions per minute. Value -1 indicates unknown.
twinship shaft generator speed max in rev per min
The actual power delivered by the main engine to the propulsion shaft, measured at the output flange of the engine.
Maximum shaft power in kilowatts. Value -1 indicates unknown.
The average of each propeller(s) speed measured in Revolutions Per Minute (RPM).
Maximum shaft rotational speed in revolutions per minute. Value -1 indicates unknown.
The torque transmitted by the main engine to the propulsion shaft, measured at the output flange of the engine.
Maximum shaft torque in kilonewton-metres. Value -1 indicates unknown.
Maximum rotational speed in revolutions per minute. Value -1 indicates unknown.
Stern thruster BLR fuel mode. Values: 1 (active), 0 (inactive), -1 (unknown).
Stern thruster Diesel Oil input temperature in degrees Celsius. Value -1 indicates unknown.
twinship stern thruster DO temperature in degrees C
Stern thruster Diesel Oil volume flow in litres per hour. Value -1 indicates unknown.
twinship stern thruster DO vol in litre per hr
Stern thruster emergency Diesel Oil mode. Values: 1 (active), 0 (inactive), -1 (unknown).
twinship stern thruster emergency DO mode
Stern thruster fuel temperature in degrees Celsius. Value -1 indicates unknown.
twinship stern thruster fuel temp in degrees C
Stern thruster fuel volume flow in litres per hour. Value -1 indicates unknown.
twinship stern thruster fuel vol litre per hr
Indicates if stern thruster is using Marine Gas Oil. Values: 1 (yes), 0 (no), -1 (unknown).
Stern thruster Marine Gas Oil mass flow in kg per hour. Value -1 indicates unknown.
twinship stern thruster MGO mass in kg per hr
Stern thruster fuel mass flow in kg per hour. Value -1 indicates unknown.
twinship stern thruster mass in kg per hr
Maximum stern thruster power output in kilowatts. Value -1 indicates unknown.
Maximum stern thruster motor speed in revolutions per minute. Value -1 indicates unknown.
twinship stern thruster speed max in rev per min
Maximum temperature in degrees Celsius. Value -1 indicates unknown.
Maximum torque in kilonewton-metres. Value -1 indicates unknown.
Maximum depth of water under the vessel in metres. Value -1 indicates unknown.
Maximum vessel draft at the aft in metres. Value -1 indicates unknown.
Maximum vessel draft at the fore in metres. Value -1 indicates unknown.
Maximum vessel draft at midship port side in metres. Value -1 indicates unknown.
Maximum vessel draft at midship starboard side in metres. Value -1 indicates unknown.
Wind Assisted Propulsion System power in kilowatts. Value -1 indicates unknown.
Wind Assisted Propulsion System power reduction efficiency as a percentage. Value -1 indicates unknown.
twinship WASP power reduction efficiency percentage
A system is a complex of functional parts working together. Each part contributes to the realisation of the system's function (though not necessarily every part in every performance of the system).
Classifies an electrical system or component as using alternating current (AC).
Auxiliary electrical loads including ship services and hotel load. Represents the non-propulsion electrical demand on the power management system.
Reduces hull friction by creating a layer of air bubbles under the hull, improving fuel efficiency.
Auxiliary engine system for power generation. Typically diesel engines, so individuals are often typed as both AuxiliaryEngineSystem and DieselEngine.
DC bus bidirectional converter that converts between AC and DC power, enabling charging and discharging of energy storage systems through the main switchboard.
A vessel's boiler system for generating steam.
Classifies a thruster or maneuvering device as bow-mounted.
A dedicated bow thruster for vessel maneuvering. Uses existing bow thruster datatype properties.
Controllable Pitch Propeller - a propeller where the blade pitch can be adjusted while rotating to optimize thrust and efficiency.
Classifies an electrical system or component as using direct current (DC).
Classifies a diesel-electric propulsion configuration where engines drive generators to produce electricity, which then powers electric motors for propulsion. Counterpart to MechanicalConfiguration for conventional direct-drive or geared propulsion.
A diesel-powered internal combustion engine.
A direct drive mechanism where the engine is directly coupled to the propeller shaft without a reduction gearbox.
Active aerodynamic or hydrodynamic drag reduction device for improving vessel efficiency.
Classifies a component as an energy storage device, capable of storing and releasing electrical energy.
Base class for systems that improve vessel efficiency without generating primary propulsion power. Includes wind-assisted propulsion, air lubrication, and aerodynamic/hydrodynamic devices.
The propulsion shaft connecting an electric motor to a propeller. Carries shaft speed and torque properties.
AC electric motor that drives a propeller via a shaft. The diesel-electric equivalent of MainEngineSystem in the propulsion chain.
Classifies a component as an emissions reduction system (e.g., SCR, scrubbers, carbon capture).
Battery or hybrid energy storage providing peak power, backup, and load balancing for diesel-electric vessels. Connected to the main switchboard via a bidirectional converter.
A system that manages or distributes energy on a vessel (e.g., PMS, shaft generators, electrical distribution).
A machine that converts energy into mechanical motion.
Fixed Pitch Propeller - a propeller with blades permanently set at a fixed angle.
A collection of ships operated by the same organization.
A four-stroke internal combustion engine.
Converts DC/AC electrical power to the frequency needed by electric motors in a diesel-electric propulsion system.
Fuel type (e.g., HFO, MGO, MDO). Defined as individuals to allow engines and components to reference specific fuel types via the consume property.
Fuel cell system for supplementary or backup power generation. Converts chemical energy from fuel (e.g., ammonia, hydrogen) directly into electrical energy.
A combined rudder and propulsion enhancement device. Unlike traditional rudders, gate rudders provide both steering and thrust augmentation.
A mechanical device for transmitting and modifying rotational motion. Subclasses include DirectDrive, Reduction, SingleSpeed, and TISO (Twin-In Single-Out).
An integrated engine and generator unit that produces electrical power. The diesel-electric equivalent of MainEngineSystem — its primary purpose is electrical energy production rather than mechanical propulsion. Subclass of EngineSystem because it is physically a diesel engine that consumes fuel and has combustion/shaft properties.
Classifies a load as hotel load (HVAC, lighting, galley, passenger comfort systems, etc.).
Main propulsion engine system. Includes shaft-related properties (power, torque, speed) as the main engine drives the propeller shaft.
Equipment used for vessel maneuvering, such as bow and stern thrusters.
Classifies the mechanical configuration or arrangement of an engine (e.g., inline, V-type, opposed). Used alongside stroke type classifications.
Shore power connection for zero-emission port operations. Allows a vessel to receive electrical power from the shore grid.
An organized group of people with a particular purpose, such as a shipping company or vessel operator.
Power Take-Off - a component or system that derives power from the main propulsion system.
Power Management System - manages electrical power distribution on a vessel.
A rotating device with blades that converts rotational motion into thrust. Subclasses: CPP (Controllable Pitch Propeller) and FPP (Fixed Pitch Propeller).
A shaft generator connected to a reduction gearbox via power take-off (PTO). Generates electrical power from the main propulsion system.
A reduction gearbox that reduces input speed to output speed.
Roll-on/Roll-off Passenger vessel - a ferry that carries both vehicles and passengers.
Roll-on/Roll-off vessel - a cargo ship designed to carry wheeled cargo that is driven on and off the ship.
Selective Catalytic Reduction (SCR) system for NOx emissions reduction using a catalytic process.
A generator that derives power from the propulsion shaft. Subclass RGShaftGenerator is connected via reduction gearbox with PTO (Power Take-Off).
Classifies a load as ship services (navigation, machinery support, safety systems, etc.).
A single-speed gearbox with a fixed gear ratio.
Classifies a wind-assisted propulsion system as a suction sail (Flettner rotor or similar technology).
Twin-In Single-Out gearbox - combines power from two engines to a single output shaft.
A vessel designed for transporting liquid cargo in bulk, such as oil, chemicals, or liquefied gas.
Base class for all physical objects in the TwinShip ontology. Subclass of IDO InanimatePhysicalObject. All vessel systems, components, and physical entities extend this class.
Base class for all organizations in the TwinShip ontology. Subclass of IDO Organization.
Base class for all systems in the TwinShip ontology. Subclass of IDO System.
A two-stroke internal combustion engine.
Wind-assisted propulsion system (WASP) such as suction sails or rotor sails that harness wind energy to supplement vessel propulsion.
Ammonia fuel. A zero-carbon fuel option for maritime applications.
Bio-diesel / Bio-fuel. A renewable fuel alternative for maritime applications.
The date and time when the resource was created.
The date and time when the resource was last updated.