exported
equivalent
silencer
IRI:
http://www.inf.ufrgs.br/ontologies/copi#Silencer
Generated on 2026-04-16
Natural Language Definition
EN
A silencer is an assembly that bears the designed function of reducing noise levels through acoustic treatment of fluid streams.
PT-BR
Um silenciador é uma montagem que possui a função projetada de reduzir níveis de ruído através do tratamento acústico de fluxos de fluidos.
Formal Axioms
Semi-formal (Aristotelian)
Every silencer is an assembly that has the function to silence noise, and every assembly that has the function to silence noise is a silencer.
First-Order Logic Theory
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▸ Stored override
∀x(Silencer(x) ↔ Assembly(x) ∧ ∃f(NoiseSilencingFunction(f) ∧ bearerOf(x,f)))
OWL 2 / Turtle
@prefix copi: <https://www.inf.ufrgs.br/ontologies/copi/> .
@prefix : <https://www.inf.ufrgs.br/ontologies/copi/> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
@prefix bfo: <http://purl.obolibrary.org/obo/> .
@prefix iof-core: <https://spec.industrialontologies.org/ontology/construct/> .
@prefix iof-av: <https://spec.industrialontologies.org/ontology/annotation/> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix qudt: <http://qudt.org/schema/qudt/> .
@prefix dcterms: <http://purl.org/dc/terms/> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix apv: <http://inf.ufrgs.br/ontologies/apv#> .
### COPI — Core Ontology for Petroleum Installations
### Class module: Silencer
<https://www.inf.ufrgs.br/ontologies/copi>
rdf:type owl:Ontology ;
dcterms:title "Core Ontology for Petroleum Installations (COPI)"@en ;
dcterms:title "Ontologia Core para Instalações de Petróleo (COPI)"@pt-br ;
dcterms:description "BFO/IOF-Core conformant ontology of equipment classes for petroleum production plants, developed using the five-step RDL enrichment method."@en ;
skos:scopeNote "Material artifacts (bfo:material_entity) that (i) are part of a petroleum production plant, and (ii) bear at least one function whose realization involves the transport (e.g. production and injection), processing (separation and other processes), control, monitoring, measurement, containment or offloading of material or energy."@en ;
skos:scopeNote "Artefatos materiais (bfo:material_entity) que (i) fazem parte de uma planta de produção de petróleo, e (ii) possuem ao menos uma função cuja realização envolve o transporte (p. ex. produção e injeção), processamento (separação e outros processos), controle, monitoramento, medição, contenção ou escoamento de material ou energia."@pt-br ;
skos:scopeNote "COPI provides high-level equipment categories defined by function to demonstrate the defined-class mechanism. Equipment subtypes are annotated with references to CFIHOS and PCA RDL terms. COPI is not a reference data library; organizations should use CFIHOS, PCA RDL, or ISO 14224 for comprehensive equipment classification."@en ;
skos:scopeNote "COPI fornece categorias de alto nível de equipamentos definidas por função para demonstrar o mecanismo de classe definida. Os subtipos de equipamentos são anotados com referências aos termos do CFIHOS e do PCA RDL. COPI não é uma biblioteca de dados de referência; organizações devem utilizar o CFIHOS, o PCA RDL ou a ISO 14224 para classificação abrangente de equipamentos."@pt-br ;
owl:versionInfo "1.1.0" ;
owl:imports <https://spec.industrialontologies.org/ontology/core/Core/> ;
owl:imports <http://purl.obolibrary.org/obo/bfo/2020/bfo.owl> ;
dcterms:creator "Nicolau Oyhenard dos Santos"@en ;
dcterms:contributor "Cauã Antunes" ;
dcterms:contributor "Haroldo Rojas" ;
dcterms:contributor "Rafael Petry" ;
dcterms:contributor "Régis Romeu" ;
dcterms:contributor "Mara Abel" ;
dcterms:isPartOf <https://inf.ufrgs.br/projetos/OntoKG> ;
dcterms:publisher "Universidade Federal do Rio Grande do Sul (UFRGS)"@en ;
dcterms:license <https://creativecommons.org/licenses/by/4.0/> ;
dcterms:created "2026-04-08"^^xsd:date ;
dcterms:modified "2026-10-08"^^xsd:date ;
apv:GlobalMinLanguageCoverage "en pt-br" ;
apv:ClassURIFormationRule "https://www[.]inf[.]ufrgs[.]br/ontologies/copi/(COPI_[0-9]{7}|[A-Z][A-Za-z0-9]*)" ;
apv:ClassMinAnnotationCoverage "rdfs:label https://spec.industrialontologies.org/ontology/annotation/naturalLanguageDefinition" .
iof-av:naturalLanguageDefinition rdf:type owl:AnnotationProperty ;
apv:MinAnnotationLength 20 .
### Identity-giving function
:COPI_0000586 rdf:type owl:Class ; # NoiseSilencingFunction
rdfs:subClassOf iof-core:DesignedFunction ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty bfo:BFO_0000054 ; # realizedIn
owl:allValuesFrom :COPI_0000587 # NoiseSilencingProcess
] ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty bfo:BFO_0000054 ; # realizedIn
owl:someValuesFrom :COPI_0000587 # NoiseSilencingProcess
] ;
rdfs:label "noise silencing function"@en ;
rdfs:label "função de silenciamento de ruído"@pt-br .
### Process type
:COPI_0000587 rdf:type owl:Class ; # NoiseSilencingProcess
rdfs:subClassOf iof-core:PlannedProcess ;
rdfs:label "noise silencing process"@en ;
rdfs:label "processo de silenciamento de ruído"@pt-br .
:COPI_0000587 # NoiseSilencingProcess
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty iof-core:hasInput ;
owl:someValuesFrom :COPI_0000037 # PortionOfFluid
] ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty iof-core:hasSpecifiedOutput ;
owl:someValuesFrom :COPI_0000037 # PortionOfFluid
] .
### Equipment universal: Silencer
:COPI_0000350 rdf:type owl:Class ; # Silencer
owl:equivalentClass [
rdf:type owl:Class ;
owl:intersectionOf (
iof-core:Assembly
[
rdf:type owl:Restriction ;
owl:onProperty iof-core:hasFunction ; # Object branch (MaterialArtifact/Assembly/Object/FiatObjectPart)
owl:someValuesFrom :COPI_0000586 # NoiseSilencingFunction
]
)
] ;
rdfs:label "silencer"@en ;
rdfs:label "silenciador"@pt-br ;
iof-av:naturalLanguageDefinition "A silencer is an assembly that bears the designed function of reducing noise levels through acoustic treatment of fluid streams."@en ;
skos:definition "A silencer is an assembly that bears the designed function of reducing noise levels through acoustic treatment of fluid streams."@en ;
iof-av:naturalLanguageDefinition "Um silenciador é uma montagem que possui a função projetada de reduzir níveis de ruído através do tratamento acústico de fluxos de fluidos."@pt-br ;
iof-av:semiFormalNaturalLanguageAxiom "Every silencer is an assembly that has the function to silence noise, and every assembly that has the function to silence noise is a silencer."@en ;
iof-av:firstOrderLogicAxiom "∀x(Silencer(x) ↔ Assembly(x) ∧ ∃f(NoiseSilencingFunction(f) ∧ bearerOf(x,f)))"@en ;
skos:definition "[ISO 15926-4] A <SILENCER> is a <FunctionalObject> that has a capability of <SILENCING>"@en ;
skos:definition "[CFIHOS] A physical object intended to reduce a noise level."@en .
Axiomatization Decision Log
1
Identity-Giving Function
Function class
NoiseSilencingFunction
⊑ DesignedFunction
Realized in
NoiseSilencingProcess
⊑ PlannedProcess
The identity-giving function is noise reduction/silencing. ISO 15926 explicitly states 'capability of SILENCING' and CFIHOS defines it as 'intended to reduce a noise level'. This function distinguishes silencers from other equipment that may incidentally affect noise but are not designed primarily for that purpose.
2
Genus Determination
Assembly
bfo:Object (BFO_0000030)
Causally unified material artefact composed of physically connected,
separable MaterialComponent parts. Satisfies
Assembly ⊑ MaterialArtifact ⊑ bfo:Object.
Among the parent candidates (FunctionalObject, other mechanical equipment, PipeFitting), none represent appropriate ontological genera in our framework. Silencers are complex engineered artifacts with multiple physically connected components (housing, internal baffles, absorption materials, inlet/outlet connections) that form a single causally unified object designed for acoustic treatment. They are assemblies rather than monolithic artifacts, and no more specific acoustics equipment genus exists in our current ontology.
3
Necessary Parts
No necessary parts recorded (concept may be primitive at this level).
These parts are universal across all silencer types - every conceivable silencer needs housing, acoustic treatment elements, and inlet/outlet connections. Specific mechanisms (reactive vs absorptive) should be modeled at subtype levels.
4
Process Participation Signature ⟨I, O, T⟩
Inputs (I)
PortionOfFluid
— carrying acoustic energy (noise)
Outputs (O)
PortionOfFluid
— reduced acoustic energy level
Transformation (T)
acoustic energy attenuation - sound pressure levels are reduced through absorption, reflection, interference, or resonance
Silencers process a single fluid stream, reducing its noise content while maintaining flow. The transformation is specifically acoustic - the fluid composition and pressure may be largely unchanged, but the acoustic energy is attenuated.
5
Axiom Mode Decision
Necessary + Sufficient
— modelled as a defined class
(≡, EquivalentClass). Automatic classification is
appropriate for this concept.
Cross-Standard Observations
ISO 15926 uses the term 'SILENCING' capability while CFIHOS uses 'reduce noise level' - both capture the same acoustic attenuation function. The definitions are consistent in identifying the functional purpose rather than structural details.
