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Published

stability

vr.tr.stability · thing-q2325497

Let an agent explain the return of physical systems to equilibrium or steady states after disturbance, describe applicable stability criteria and evidence, and support learning and modelling questions.

Thing Registry Cross-cutting context XCT.QLT
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

Understand What stability is.

Concept

Concept and senses.

Concept

Concept.

  1. What is stability in general, and how do mechanical, thermodynamic, chemical, colloidal, ecological and social senses differ? definition
  2. Which sense is meant? boundary

Criteria

Criteria.

Criteria

Criteria.

  1. How is stability defined mathematically, including linear stability and stability of equilibria? definition
  2. Which entry fits dynamical systems? action
Analyse Analysis and measurement.

Analyse

Analysing a system.

Analyse

Analysis.

  1. How can the stability of this system be analysed or tested? action
  2. Which entry fits control theory or structural analysis? action

Measure

Measuring stability.

Measure

Measurement.

  1. How are chemical, colloidal and foam stability measured experimentally? measurement
  2. Which standards apply? provenance
Apply Applications.

Design

Designing for stability.

Design

Design.

  1. How are structures, vehicles, control systems and products designed to be stable? provenance
  2. Which entry fits a specific application? action

Systems

Ecological and social systems.

Systems

Systems.

  1. How do ecologists and social scientists study stability of communities and institutions, with positions attributed? provenance
  2. Which findings are contested? boundary
Learn History and teaching.

History

History.

History

History.

  1. How did the mathematical theory of stability develop from Lagrange and Lyapunov onward? provenance
  2. Which references are standard? provenance

Teach

Teaching.

Teach

Teaching.

  1. How can stability be taught with demonstrations? action
  2. Which misconceptions arise? provenance

Classifiers Filled

Family
Thing Registry
Category
Cross-cutting context
Entry kind
thing
Plane
XCT
Domain
XCT.QLT
Other names and narrower kinds
thermodynamic stability, family stability, sedimentation stability, functional stability, foam stability, Linear stability, permanence, stability of elastic systems, hydrodynamic stability, Plasma stability, political stability, Input-to-state stability

What it is Filled

Stability in the supplied sense is the tendency of a physical system to return to its equilibrium or steady state after disturbance; remaining nearby without returning is a distinct stability criterion, and thermodynamic stability depends on the applicable constraints and thermodynamic potential rather than universally requiring lowest energy.

Why it exists Filled

Let an agent explain the return of physical systems to equilibrium or steady states after disturbance, describe applicable stability criteria and evidence, and support learning and modelling questions.

Distinguishing features Filled

  • The property concerns a physical system's response to disturbance from an equilibrium or steady state.
  • Returning to the reference state is distinct from remaining nearby without returning.
  • Mathematical criteria depend on the physical model, constraints and disturbances considered.
  • Stability can be a design goal for physical systems.

What robots and AI may and may not do Filled

Must not

  • Certify a structure, vehicle or control system as stable without proper analysis by a competent engineer.
  • Confuse the different technical senses of stability in safety-related work.
  • Present a system's past stability as a guarantee of future behaviour.

Only with a human decision

  • Accepting a stability analysis for a design that people's safety depends on requires human oversight.

May

  • Explain stability in physical systems using criteria appropriate to their dynamics and constraints.
  • Check a model or system for stability within the user's authorization.

Moral aspects Filled

  • Wrong stability claims about ships, structures or reactors have killed people.

Who is affected

  • Users of engineered systems are affected.
  • People near structures and machines are affected.

Owners Filled

Steward

Nobody: a property; engineers answer for stability claims about their systems.

Links to other meta-models Filled

parent

  • Q403605 - registry parent class

related

  • robustness - category
  • damping ratio - a parameter governing stability of oscillating systems
  • symbiosis - stable relationships in ecology
  • social safety net - programmes supporting family and social stability

What else AI and robots need to interact with it Filled

Identity and identifiers required Filled

  • Vercy registry: vr.tr.stability
  • Wikidata: Q2325497 (https://www.wikidata.org/wiki/Q2325497)

Direct properties not applicable Not applicable

Not applicable

Plane XCT: no invented physical properties.

Recognition optional Filled

  • Time-response plots can show whether a disturbed physical system returns toward its equilibrium or steady state.
  • Phase-space diagrams can represent trajectories approaching a reference state.
  • Equilibrium is a reference state, while stability describes the system's response to disturbance.
  • Not physical; a property.

Capabilities and actions required Filled

  • explain the concept across fields
  • describe analysis and measurement
  • support modelling questions
  • support learning

Hazards and failure modes required Filled

  • Conflating senses across fields
  • Assuming stability without analysis
  • Instability leading to collapse or runaway

Standards and interfaces required Filled

  • Engineering stability criteria in design codes
  • Chemical stability testing standards
  • No regulation of the general concept

Context of use required Filled

  • Persistence or return after disturbance.
  • mechanical and structural stability
  • stability in control theory and linear stability
  • thermodynamic and chemical stability
  • colloidal, sedimentation and foam stability
  • ecological and social stability

Sources Filled

  1. Wikidata item Q2325497: stability - identity and sense of the item
  2. Stability theory - The response of a system's motion or equilibrium to disturbances.
  3. Lyapunov stability - Formal equilibrium stability, including asymptotic stability in which a disturbed system returns toward equilibrium.

Open questions

  • Should each specialised stability be a separate entry?
  • How should textbooks be linked?
  • How should standards 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-q2325497/spec.json