combined diesel and diesel
Enable an agent to recognise combined diesel and diesel propulsion, assess its available operating modes, and identify actions permitted by its mechanical and control constraints.
Bundle → Layer → Finding → Questions Filled
6 bundles · 11 layers · 15 findings · 26 questions
Combined drive identity Recognise CODAD through actual engine-to-shaft connections.
Power-path topology
Describe where diesel outputs converge.
Shared-shaft combination
Record evidence that multiple diesel inputs can deliver torque concurrently to a common shaft.
- Which diesel engines connect to each combining gearbox and shaft output? definition
- Which drawing or manufacturer record demonstrates simultaneous power contribution? provenance
Architecture boundaries
Separate the CODAD subsystem from neighbouring propulsion arrangements.
Classification boundary
Identify whether the label describes an entire propulsion plant or a mechanically combined diesel subsystem.
- Can the engines power the shared output individually as well as simultaneously? boundary
- Do electrical drives, gas turbines or independent shafts require a separate surrounding architecture model? boundary
Torque combination and isolation Describe the mechanical conditions for joining and separating diesel inputs.
Combining-gear capability
Relate engine ratings to admissible input and output loading.
Gear-loading envelope
Record ratios and torque-speed limits for each approved engine combination.
- What ratios relate each diesel input speed to shaft speed? measurement
- What input, output and transient limits constrain simultaneous engine loading? measurement
Input separation
Describe coupling mechanisms and isolation effectiveness.
Engine disconnection
Record how an inactive or failed diesel is separated from the operating drivetrain.
- Which clutch, coupling or other mechanism connects and disconnects each diesel input? definition
- Under what documented conditions can an input be isolated, and can the shared drivetrain back-drive it? action
Mode control and transitions Represent permitted engine combinations and their controlled transitions.
Operating-mode state
Distinguish requested propulsion mode from confirmed mechanical state.
Confirmed engine combination
Record active engines, coupling feedback and load-sharing status together.
- Which combinations are approved, and which combination is currently confirmed by engine and coupling feedback? definition
- How is load allocated between engaged engines, and what deviation is permitted? measurement
Engagement and disengagement
Capture prerequisites and authority for changing diesel participation.
Transition permissives
Associate each mode change with installation-specific speed, load, service and control requirements.
- What speed matching, load reduction and auxiliary-service conditions must be met before engagement or disengagement? action
- Which interlocks, control station and abort conditions govern the requested transition? action
Mode-dependent performance Assess useful shaft output and fuel use for each diesel combination.
Deliverable shaft output
Resolve usable output at the common shaft.
Power by engine combination
Record continuous and time-limited output without equating installed engine power with delivered shaft power.
- What shaft power and speed are available continuously and temporarily in each approved combination? measurement
- Which transmission losses, environmental deratings and propulsor constraints qualify those values? boundary
Fuel and load selection
Compare engine combinations at equivalent useful output.
Supported mode preference
Require installation evidence before preferring fewer or more running engines for a given demand.
- What measured fuel rates distinguish individual and combined operation at matched shaft power and speed? measurement
- Which minimum-load, transient-response or reserve-power requirements constrain the preferred combination? action
Degraded operation and assurance Determine what propulsion remains available and what evidence permits continued operation.
Failure propagation
Separate loss of one diesel input from loss of a shared drive dependency.
Remaining propulsion paths
Map engine, coupling, gearbox and auxiliary-service failures to surviving permitted modes.
- After a specified engine or coupling failure, which power paths remain usable and at what limits? action
- Which shared lubrication, cooling, fuel, control or gearbox dependencies can disable all inputs to the shaft? boundary
Maintenance and operating authority
Link condition evidence and isolation status to operating permission.
Condition-based restrictions
Record combining-gear and coupling condition evidence, applicable restrictions and verified maintenance boundaries.
- Which oil condition, temperature, vibration or clutch-slip observations trigger restrictions under the applicable documentation? measurement
- What verified isolation prevents shared-shaft rotation or auxiliary energy from reaching equipment under maintenance? action
- Which issuing bodies, approval records and acceptance tests establish the installation's permitted modes and return-to-service criteria? provenance
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Check these first
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these check these first hold for the sense of combined diesel and diesel this model covers, and on what evidence? provenance
Identifiers and schemes
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these identifiers and schemes hold for the sense of combined diesel and diesel this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these real-world use hold for the sense of combined diesel and diesel this model covers, and on what evidence? provenance
Failure modes and hazards
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these failure modes and hazards hold for the sense of combined diesel and diesel this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of combined diesel and diesel this model covers, and on what evidence? provenance
Classifiers Filled
- Family
- Thing Registry
- Category
- Physical world and living systems
- Entry kind
- thing
- Plane
- PHY
- Domain
- PHY.OBJ
What it is Filled
Combined diesel and diesel (CODAD) is a marine propulsion arrangement in which two or more diesel engines can transmit mechanical power simultaneously through combining gearing to a common propeller shaft, with fewer engines operating when less power is required.
In scope
- Diesel-engine grouping and mechanical power paths to shared shaft outputs
- Combining gears, coupling arrangements and engine isolation capabilities
- Permitted engine combinations, load sharing and mode transitions
- Mode-dependent shaft power, operating limits and fuel-use evidence
- Propulsion availability, shared dependencies and maintenance restrictions
Out of scope
- Internal design and overhaul procedures of individual diesel engines
- Whole-vessel hull resistance, navigation and mission planning
- Detailed propeller design and hydrodynamic optimisation
- Diesel-electric generation and electric propulsion architectures
- Combined propulsion architectures incorporating gas turbines
- Product catalogues and individual vessel identity records
Why it exists Filled
Enable an agent to recognise combined diesel and diesel propulsion, assess its available operating modes, and identify actions permitted by its mechanical and control constraints.
Distinguishing features Filled
- At least two diesel engines have mechanical paths capable of contributing power simultaneously to a common propeller shaft.
- The arrangement supports individual-engine operation as well as combined operation; two mutually exclusive engine inputs alone do not establish CODAD.
- Two diesel engines driving separate shafts without a combining path do not establish CODAD.
- The defining power combination occurs mechanically through gearing, rather than solely through generators and an electrical bus.
- A gas turbine contributing to the same combined drive requires classification beyond the diesel-only CODAD subsystem.
What robots and AI may and may not do Filled
Must not
- Start, stop or couple engines without the engineer's authority.
- Override alarms or protective trips in the engine room.
- Misstate the propulsion type of a ship in records.
Only with a human decision
- Changing propulsion modes during manoeuvres in confined waters.
- Shutting down propulsion at sea.
May
- Explain the propulsion arrangement and identify ships that use it from documented sources.
- Report the state and faults of a ship's diesel plant for its operator.
- Operate engines and gearboxes the agent is authorized to control.
Moral aspects Filled
- Propulsion failure at sea endangers crews and other ships.
- Diesel emissions affect air quality in ports.
Who is affected
- Ship crews
- Other ships nearby
- Port communities
Owners Filled
Steward
The ship operator; the chief engineer answers for the plant on board.
Links to other meta-models Filled
parent
- Q29380218 - registry parent class
What else AI and robots need to interact with it Filled
Identity and identifiers required Filled
- Vercy registry: vr.tr.combined-diesel-and-diesel
- Wikidata: Q1023956 (https://www.wikidata.org/wiki/Q1023956)
Direct properties required Filled
- Engine-to-shaft topology: Engine → coupling → gear input → shaft output
- Diesel inputs per combining group: Count of diesel engines
- Permitted engine combinations: Documented sets of engaged engines for each shaft output
- Current drive configuration: Stopped, individual-engine, combined, transitioning, degraded, tripped, unknown
- Available shaft power by mode: kW at specified shaft speed and operating conditions
- Gear-input and shaft limits: Torque in N·m; rotational speed in rpm; duration in s or h
- Engine load distribution: kW and percentage of applicable rating per engaged engine
- Coupling availability: Engaged, disengaged, transitioning, failed, isolated, unknown
- Fuel use at matched shaft demand: kg/h at specified shaft kW, rpm and ambient conditions
- Approved operating envelope: Installation → applicable manuals, class approvals and acceptance records
Recognition required Filled
- Several diesel engines connected through a combining gearbox to the shafts.
- Funnel exhaust arrangements for multiple diesels.
Capabilities and actions required Filled
- Classify a documented propulsion arrangement against CODAD boundary tests.
- Trace which diesel engines can supply each shaft individually and together.
- Compare permitted engine combinations for a specified shaft-power demand.
- Assess whether a requested mode transition satisfies documented prerequisites.
- Estimate remaining propulsion capability after an engine or shared-component outage.
- Identify evidence and isolation requirements before recommending maintenance or return to service.
Hazards and failure modes required Filled
- Engine room fire from fuel or lubricant leaks.
- Gearbox or clutch failure leading to loss of propulsion.
- Noise and exhaust exposure for engine room crews.
Standards and interfaces required Filled
- Convention on the International Regulations for Preventing Collisions at Sea (COLREGs), International Maritime Organization.
Context of use required Filled
- Combined diesel and diesel propulsion is used in marine vessels where multiple diesel engines supply mechanical power to a common propeller shaft.
- It allows available propulsion power to match operating demand by changing the number of connected engines.
- The arrangement is relevant when assessing machinery layout, operating flexibility and propulsion availability.
Sources Filled
- Wikidata item Q1023956: combined diesel and diesel - identity and sense of the item
- Wikipedia: Combined diesel and diesel - general description of the item
Open questions
- Does an existing Vercy world model already own CODAD or the encompassing combined mechanical diesel architecture, requiring this registry entry to link to it?
- How should authoritative sources delimit CODAD variants with more than two engines, cross-connected shafts or additional propulsion technologies?
- Which manufacturer manuals and class-approved installation records establish actual coupling designs, mode combinations and transition permissives?
- What representative measured shaft-power, fuel-use, mass and dimensional ranges can be supported without implying universal CODAD ratings?
- Which class, flag-state and vessel-service requirements apply to each installation, and what evidence establishes its degraded-operation limits?
Machine files
Provenance
thing registry research (pass 2) · unreviewed
Built from: models/things/publications/thing-q1023956/spec.json