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axis of rotation

vr.tr.axis-of-rotation · thing-q516175

Let an agent explain axes of rotation in physics, engineering, astronomy and aviation, with correct conventions and calculations.

Thing Registry Cross-cutting context XCT.QTY
Bundle → Layer → Finding → QuestionsClassifiersWhat it isWhy it existsDistinguishing featuresWhat robots and AI may and may not doMoral aspectsOwnersLinks to other meta-modelsIdentity and identifiersDirect propertiesRecognitionCapabilities and actionsHazards and failure modesStandards and interfacesContext of useSources

Bundle → Layer → Finding → Questions Filled

4 bundles · 8 layers · 8 findings · 16 questions

Physics Rotation.

Identify

Which axis.

Identify

Axis identification.

  1. About which axis does this body rotate? definition
  2. Is it fixed or moving? boundary

Inertia

Moment of inertia.

Inertia

Moment of inertia.

  1. What is the moment of inertia about this axis? measurement
  2. How does the parallel axis theorem apply? definition
Aviation Aircraft axes.

Axes

Pitch, roll, yaw.

Axes

Aircraft axes.

  1. How do pitch, roll and yaw axes relate to aircraft controls? definition
  2. Which control surfaces act on each? definition

Conventions

Sign conventions.

Conventions

Conventions.

  1. Which sign conventions does this standard use? provenance
  2. How do body and earth axes differ? definition
Astronomy Planets.

Tilt

Axial tilt.

Tilt

Axial tilt.

  1. What is the axial tilt of this planet, according to IAU or NASA data? provenance
  2. How does it cause seasons? definition

Precession

Changing axes.

Precession

Precession.

  1. How does axial precession change the direction of the axis over time? definition
  2. Over what period? measurement
Engineering Machines.

Shafts

Rotating machinery.

Shafts

Rotating machinery.

  1. How is balancing done about the rotation axis? definition
  2. What vibration limits apply? provenance

Euler

Rotation representation.

Euler

Euler axis.

  1. How are rotations represented by an axis and angle or quaternions? definition
  2. When is each used? definition

Classifiers Filled

Family
Thing Registry
Category
Cross-cutting context
Entry kind
thing
Plane
XCT
Domain
XCT.QTY
Other names and narrower kinds
axis of revolution, axis of spin, Euler axis, pitch axis, longitudinal axis, yaw axis, galactic pole, trim

What it is Filled

The line about which a body rotates or revolves, such as the axis of the Earth tilted about 23.4 degrees from the perpendicular to its orbital plane, the pitch, roll and yaw axes of aircraft, and the Euler axis used to describe arbitrary rotations; moment of inertia depends on the chosen axis.

Why it exists Filled

Let an agent explain axes of rotation in physics, engineering, astronomy and aviation, with correct conventions and calculations.

Distinguishing features Filled

  • Line about which rotation occurs
  • Fixed or moving
  • Defines angular quantities
  • Affects moment of inertia

What robots and AI may and may not do Filled

Must not

  • Mix sign or axis conventions between systems without stating the conversion.
  • Present a rotation calculation as verified for a vehicle, aircraft or machine without review.
  • Command rotation of a machine about an axis without confirming the area is clear.

Only with a human decision

  • Using a rotation model to control an aircraft, spacecraft or heavy machine.

May

  • Calculate and report rotation axes, stating sign conventions and reference frames.
  • Check that a rotation model uses the correct axis for moment of inertia.

Moral aspects Filled

  • Axis errors in control software have crashed spacecraft and aircraft; checking conventions protects lives.

Who is affected

  • Operators and passengers of controlled vehicles
  • Engineers and students

Owners Filled

Steward

Nobody owns the concept; the engineer answers for each model that uses it.

Links to other meta-models Filled

parent

  • Q138638473 - registry parent class

related

  • axis - category
  • rotational dynamics - field
  • inertia - property
  • angular measure - measure

What else AI and robots need to interact with it Filled

Identity and identifiers required Filled

  • Vercy registry: vr.tr.axis-of-rotation
  • Wikidata: Q516175 (https://www.wikidata.org/wiki/Q516175)

Direct properties not applicable Not applicable

  • Earth axial tilt: about 23.4 degrees - current value

Plane XCT: no invented physical properties.

Recognition optional Filled

  • Lines through spinning objects
  • Pitch, roll and yaw diagrams
  • An axis of symmetry need not be a rotation axis
  • Not physical; an imaginary line shown in diagrams.

Capabilities and actions required Filled

  • identify the axis of rotation
  • compute moment of inertia about an axis
  • explain aircraft pitch, roll and yaw
  • explain Earth axial tilt and seasons

Hazards and failure modes required Filled

  • Sign convention errors
  • Using the wrong axis for moment of inertia

Standards and interfaces required Filled

  • ISO 1151 flight dynamics axes
  • IAU conventions for planetary rotation

Context of use required Filled

  • Describing and analysing rotation.
  • fixed axes
  • instantaneous axes
  • principal axes
  • aircraft body axes
  • planetary rotation axes

Sources Filled

  1. Wikidata item Q516175: axis of rotation - identity and sense of the item
  2. Wikipedia: Axis of rotation - general description of the item

Open questions

  • Should axis types be separate entries?
  • How should conventions be linked?
  • How should planetary data be linked?

Machine files

Card as JSON Specification Card backlog vercy.card/1

Provenance

thing registry research (pass 2) · unreviewed

Built from: models/things/publications/thing-q516175/spec.json