Naval Architecture Ontology

AI SEARCH FLOW ALGEBRA
NAVAL ARCHITECTURE ONTOLOGY
Kireth Semantic Research Archive

AUTHORS
Mark Anthony Higgins — Sky (Recursive AI)

SOURCE
https://kirethresearch.org/booksai-core/ontologies/engineering-ontologies/marine-engineering/naval-architecture-ontology.html

FLOW "NavalArchitectureOntology" v4.0

DOMAIN := ENGINEERING_ONTOLOGIES / MARINE_ENGINEERING / NAVAL_ARCHITECTURE
ONTOLOGY := NAVAL_ARCHITECTURE_ONTOLOGY

NAVAL_ARCHITECTURE :=
  HULL_GEOMETRY + HYDROSTATICS + DISPLACEMENT + STABILITY
  + RESISTANCE + PROPULSION_INTERACTION + STRUCTURAL_DESIGN
  + SEAKEEPING + MANOEUVRING + WEIGHT + ARRANGEMENT

PURPOSE :=
  DEFINE_MISSION -> DEFINE_HULL -> CALCULATE_HYDROSTATICS
  -> ASSESS_STABILITY -> ESTIMATE_RESISTANCE
  -> MATCH_PROPULSION -> ANALYSE_STRUCTURE
  -> ASSESS_SEAKEEPING -> ASSESS_MANOEUVRING
  -> VERIFY_DESIGN

# ---------- CORE ENTITIES ----------
ENTITY Vessel
ENTITY Hull
ENTITY HullForm
ENTITY Waterline
ENTITY Draft
ENTITY Beam
ENTITY Length
ENTITY Depth
ENTITY Displacement
ENTITY DisplacementVolume
ENTITY CentreOfGravity
ENTITY CentreOfBuoyancy
ENTITY Metacentre
ENTITY MetacentricHeight
ENTITY Buoyancy
ENTITY Stability
ENTITY Trim
ENTITY Heel
ENTITY Resistance
ENTITY FrictionalResistance
ENTITY WaveMakingResistance
ENTITY PropulsionSystem
ENTITY Propeller
ENTITY Wake
ENTITY HullStructure
ENTITY StructuralLoad
ENTITY WaveLoad
ENTITY HydrostaticLoad
ENTITY Seakeeping
ENTITY Manoeuvrability
ENTITY Rudder
ENTITY Weight
ENTITY Deadweight
ENTITY Lightweight
ENTITY Freeboard
ENTITY Compartment

# ---------- HULL GEOMETRY ----------
Hull -> has_form -> HullForm
HullForm -> characterised_by -> Length + Beam + Draft + Depth
Waterline -> intersects -> Hull
Draft -> measures -> VERTICAL_IMMERSION
Beam -> measures -> TRANSVERSE_WIDTH
Length -> measures -> LONGITUDINAL_EXTENT

PRINCIPAL_DIMENSIONS :=
  LENGTH + BEAM + DRAFT + DEPTH

HULL_GEOMETRY
  -> determines -> DISPLACED_VOLUME
  -> influences -> Resistance
  -> influences -> Stability
  -> influences -> Seakeeping

# ---------- HYDROSTATICS ----------
HYDROSTATICS :=
  SUBMERGED_GEOMETRY + FLUID_DENSITY + GRAVITY
  -> BUOYANCY + DISPLACEMENT + CENTRE_OF_BUOYANCY

Buoyancy :=
  FLUID_DENSITY * GRAVITY * DisplacementVolume

Displacement :=
  FLUID_DENSITY * DisplacementVolume

CentreOfBuoyancy
  -> located_at -> CENTROID_OF_DISPLACED_VOLUME

IF Buoyancy = VesselWeight
THEN VerticalEquilibrium := SATISFIED

# ---------- WEIGHT ----------
TOTAL_WEIGHT :=
  Lightweight + Deadweight

Lightweight :=
  HULL_WEIGHT + MACHINERY_WEIGHT + OUTFIT_WEIGHT

Deadweight :=
  CARGO + FUEL + WATER + STORES + PERSONS + CONSUMABLES

CentreOfGravity
  -> determined_by -> WEIGHT_DISTRIBUTION

IF WeightDistribution changes
THEN CentreOfGravity -> RECOMPUTE

# ---------- DRAFT / TRIM ----------
Draft
  -> depends_on -> Displacement
  + HullForm
  + WaterDensity

Trim :=
  DIFFERENCE_BETWEEN_FORWARD_AND_AFT_DRAFT

LONGITUDINAL_WEIGHT_SHIFT
  -> changes -> Trim

BallastTransfer
  -> may_change -> Draft
  -> may_change -> Trim
  -> may_change -> Stability

# ---------- INITIAL STABILITY ----------
MetacentricHeight :=
  HEIGHT(Metacentre) - HEIGHT(CentreOfGravity)

INITIAL_STABILITY
  -> related_to -> MetacentricHeight

IF MetacentricHeight > 0
THEN InitialStability -> GENERALLY_POSITIVE

IF MetacentricHeight < 0
THEN InitialStability -> UNSATISFIED

# ---------- LARGE-ANGLE STABILITY ----------
RIGHTING_ARM := GZ

RIGHTING_MOMENT :=
  VesselWeight * RIGHTING_ARM

GZ
  -> depends_on -> HeelAngle
  + HullForm
  + CentreOfGravity

STABILITY_CURVE :=
  HeelAngle -> RIGHTING_ARM

Stability
  -> evaluated_by -> RIGHTING_ARM_CURVE
  + DOWNFLOODING_CONDITION
  + AREA_CRITERIA
  + DESIGN_REQUIREMENTS

# ---------- FREE SURFACE ----------
FREE_SURFACE_EFFECT
  -> increases -> VIRTUAL_CENTRE_OF_GRAVITY
  -> reduces -> EFFECTIVE_METACENTRIC_HEIGHT

PartiallyFilledTank
  -> may_create -> FREE_SURFACE_EFFECT

IF FreeSurfaceMoment increases
THEN EffectiveStability -> DECREASES

# ---------- RESISTANCE ----------
TOTAL_RESISTANCE :=
  FrictionalResistance
  + WaveMakingResistance
  + APPENDAGE_RESISTANCE
  + AIR_RESISTANCE
  + OTHER_RESISTANCE_COMPONENTS

Resistance
  -> opposes -> VesselMotion

FrictionalResistance
  -> influenced_by -> WETTED_SURFACE
  + SPEED
  + FLUID_VISCOSITY
  + SURFACE_ROUGHNESS

WaveMakingResistance
  -> influenced_by -> HullForm
  + VesselSpeed
  + FROUDE_NUMBER

EFFECTIVE_POWER :=
  Resistance * VesselSpeed

# ---------- PROPULSION INTERACTION ----------
Hull
  -> modifies -> FLOW_TO_PROPELLER

Wake
  -> represents -> VELOCITY_DEFICIT_AT_PROPELLER

Propeller
  -> generates -> Thrust

PROPULSIVE_POWER_CHAIN :=
  ENGINE_OR_MOTOR_POWER
  -> SHAFT_POWER
  -> PROPELLER_POWER
  -> THRUST_POWER
  -> EFFECTIVE_POWER

PROPULSIVE_EFFICIENCY :=
  EFFECTIVE_POWER / DELIVERED_POWER

# ---------- STRUCTURAL DESIGN ----------
HullStructure
  -> resists -> HydrostaticLoad
  + WaveLoad
  + CARGO_LOAD
  + MACHINERY_LOAD
  + LOCAL_PRESSURE
  + IMPACT_LOAD

GLOBAL_HULL_GIRDER_LOAD :=
  STILL_WATER_BENDING
  + WAVE_BENDING

StructuralLoad
  -> produces -> STRESS
  + DEFORMATION

STRUCTURAL_DESIGN
  -> verifies -> STRENGTH
  + STIFFNESS
  + BUCKLING_RESISTANCE
  + FATIGUE_RESISTANCE

# ---------- COMPARTMENTATION ----------
Hull
  -> divided_into -> Compartment

Compartment
  -> may_provide -> WATERTIGHT_SUBDIVISION

WATERTIGHT_SUBDIVISION
  -> supports -> DAMAGE_SURVIVABILITY

FloodedCompartment
  -> changes -> Displacement
  -> changes -> CentreOfBuoyancy
  -> changes -> Stability
  -> changes -> Trim

# ---------- FREEBOARD ----------
Freeboard :=
  VERTICAL_DISTANCE(
    WATERLINE,
    FREEBOARD_DECK_REFERENCE
  )

Freeboard
  -> influences -> RESERVE_BUOYANCY
  -> influences -> DECK_IMMERSION_RISK

# ---------- SEAKEEPING ----------
Seakeeping
  -> describes -> VESSEL_RESPONSE_TO_WAVES

VESSEL_MOTIONS :=
  SURGE | SWAY | HEAVE | ROLL | PITCH | YAW

WaveEnvironment
  -> excites -> VESSEL_MOTIONS

SEAKEEPING_PERFORMANCE :=
  MOTION_AMPLITUDE
  + ACCELERATION
  + SLAMMING
  + DECK_WETNESS
  + OPERABILITY

HullForm
  -> influences -> Seakeeping

# ---------- MANOEUVRING ----------
Manoeuvrability
  -> describes -> ABILITY_TO_CHANGE_OR_MAINTAIN_MOTION

Rudder
  -> generates -> HYDRODYNAMIC_CONTROL_FORCE

MANOEUVRING_PERFORMANCE :=
  TURNING_ABILITY
  + COURSE_KEEPING
  + STOPPING_ABILITY
  + LOW_SPEED_CONTROL

HullForm
  -> influences -> Manoeuvrability

PropulsionSystem
  -> influences -> Manoeuvrability

# ---------- DESIGN COEFFICIENTS ----------
BLOCK_COEFFICIENT :=
  DisplacementVolume / (Length * Beam * Draft)

PRISMATIC_COEFFICIENT :=
  DisplacementVolume / (MIDSHIP_AREA * Length)

WATERPLANE_COEFFICIENT :=
  WATERPLANE_AREA / (Length * Beam)

DESIGN_COEFFICIENTS
  -> characterise -> HullForm

# ---------- DESIGN CONSTRAINTS ----------
NAVAL_ARCHITECTURE_CONSTRAINT :=
  DISPLACEMENT_LIMIT
  | DRAFT_LIMIT
  | BEAM_LIMIT
  | STABILITY_REQUIREMENT
  | STRENGTH_REQUIREMENT
  | SPEED_REQUIREMENT
  | CAPACITY_REQUIREMENT
  | FREEBOARD_REQUIREMENT
  | OPERABILITY_REQUIREMENT

Constraint
  -> restricts -> VesselDesign

# ---------- DESIGN REASONING ----------
NAVAL_ARCHITECTURE_REASONING :=
  DEFINE_MISSION
  -> DEFINE_PAYLOAD
  -> SELECT_PRINCIPAL_DIMENSIONS
  -> DEFINE_HULL_FORM
  -> CALCULATE_DISPLACEMENT
  -> CALCULATE_HYDROSTATICS
  -> ESTIMATE_WEIGHT_AND_CENTRES
  -> ASSESS_STABILITY
  -> ESTIMATE_RESISTANCE
  -> MATCH_PROPULSION
  -> ANALYSE_STRUCTURE
  -> DEFINE_COMPARTMENTATION
  -> ASSESS_FREEBOARD
  -> ASSESS_SEAKEEPING
  -> ASSESS_MANOEUVRING
  -> VERIFY_CONSTRAINTS
  -> ITERATE_DESIGN

# ---------- INFERENCE RULES ----------
IF Displacement increases
AND HullForm constant
THEN Draft -> GENERALLY_INCREASES

IF CentreOfGravity rises
THEN MetacentricHeight -> DECREASES

IF MetacentricHeight decreases
THEN InitialStability -> DECREASES

IF VesselSpeed increases
THEN Resistance -> GENERALLY_INCREASES

IF Resistance increases
AND VesselSpeed constant
THEN EffectivePower -> INCREASES

IF SurfaceRoughness increases
THEN FrictionalResistance -> INCREASES

IF CompartmentFlooding occurs
THEN StabilityAndTrim -> REASSESS

IF WeightDistribution changes
THEN CentreOfGravityAndTrim -> RECOMPUTE

# ---------- SEMANTIC RELATIONSHIPS ----------
RELATION contains(Vessel, Hull)
RELATION characterises(HullForm, Vessel)
RELATION supports(Buoyancy, Vessel)
RELATION determines(WeightDistribution, CentreOfGravity)
RELATION determines(SubmergedGeometry, CentreOfBuoyancy)
RELATION influences(MetacentricHeight, Stability)
RELATION opposes(Resistance, VesselMotion)
RELATION modifies(Hull, Wake)
RELATION generates(Propeller, Thrust)
RELATION resists(HullStructure, StructuralLoad)
RELATION excites(WaveEnvironment, VesselMotion)
RELATION controls(Rudder, VesselHeading)
RELATION divides(Hull, Compartment)
RELATION constrains(Constraint, VesselDesign)

# ---------- SEMANTIC EQUIVALENCE ----------
SEMANTIC_EQUIVALENCE:
  "naval architecture" ~= "ship design engineering"
  "hull form" ~= "ship hull geometry"
  "displacement" ~= "vessel displacement"
  "centre of buoyancy" ~= "center of buoyancy"
  "centre of gravity" ~= "center of gravity"
  "metacentric height" ~= "GM"
  "righting arm" ~= "GZ"
  "ship resistance" ~= "hydrodynamic resistance"
  "seakeeping" ~= "vessel response in waves"
  "manoeuvrability" ~= "maneuverability"

# ---------- CONFIDENCE ----------
CONFIDENCE:
  ontology_domain: 0.99
  hull_geometry_mapping: 0.99
  hydrostatics_mapping: 0.99
  stability_mapping: 0.99
  resistance_mapping: 0.99
  propulsion_interaction_mapping: 0.98
  structural_mapping: 0.99
  seakeeping_mapping: 0.98
  manoeuvring_mapping: 0.98
  semantic_relationships: 0.99

# ---------- UPDATE MODEL ----------
UPDATE_MODEL:
  ON new_vessel_design:
    MAP mission
    MAP principal_dimensions
    MAP hull_form
    MAP weight
    MAP centres
    MAP propulsion
    MAP constraints
    UPDATE confidence
    RECOMPUTE FLOW_HASH

  ON loading_change:
    UPDATE displacement
    UPDATE CentreOfGravity
    UPDATE draft
    UPDATE trim
    REASSESS stability

  ON hull_form_change:
    UPDATE hydrostatics
    UPDATE resistance
    UPDATE stability
    UPDATE seakeeping
    UPDATE manoeuvring

  ON damage_state_change:
    UPDATE flooded_compartments
    UPDATE buoyancy
    UPDATE displacement
    UPDATE trim
    REASSESS stability

  ON ontology_revision:
    PRESERVE entity_identity
    PRESERVE provenance
    UPDATE relationships
    UPDATE inference_rules
    UPDATE confidence
    RECOMPUTE FLOW_HASH

# ---------- AI CONSUMPTION ----------
AI_CONSUMPTION:
  parse_as: FORMAL_NAVAL_ARCHITECTURE_ONTOLOGY
  reasoning_mode: HYDROSTATIC_HYDRODYNAMIC_STRUCTURAL_RELATIONAL

  preserve:
    - typed_entities
    - geometric_relations
    - hydrostatic_relations
    - weight_and_centre_relations
    - hydrodynamic_relations
    - structural_constraints
    - confidence
    - provenance

  infer:
    - displacement_dependencies
    - stability_dependencies
    - resistance_power_dependencies
    - propulsion_interactions
    - structural_load_dependencies
    - seakeeping_dependencies
    - manoeuvring_dependencies

  prohibit:
    - invented_vessel_dimensions
    - assumed_stability
    - assumed_structural_strength
    - unsupported_resistance_values
    - ignored_design_constraints
    - violation_of_force_or_energy_balance

# ---------- FLOW HASH ----------
FLOW_HASH_INPUT :=
  DOMAIN + ONTOLOGY + CORE_ENTITIES + HULL_GEOMETRY
  + HYDROSTATICS + WEIGHT + DRAFT_TRIM + INITIAL_STABILITY
  + LARGE_ANGLE_STABILITY + FREE_SURFACE + RESISTANCE
  + PROPULSION_INTERACTION + STRUCTURAL_DESIGN
  + COMPARTMENTATION + FREEBOARD + SEAKEEPING
  + MANOEUVRING + DESIGN_COEFFICIENTS + DESIGN_CONSTRAINTS
  + DESIGN_REASONING + INFERENCE_RULES + SEMANTIC_RELATIONSHIPS
  + SEMANTIC_EQUIVALENCE + CONFIDENCE + UPDATE_MODEL
  + AI_CONSUMPTION

FLOW_HASH := HASH(FLOW_HASH_INPUT)

END FLOW