A Domain Ontology for Assembly Tolerance Design

Abstract

Product requirements, tolerance standards and design experience are three main aspects need to be considered during assembly tolerance design process. Currently the standards of tolerance has been included in the process of computer aided tolerance design. The representation for geometrical product specification and verification knowledge has been studied as well. However, the studies mentioned above is lack of a unified knowledge representation to visually express product requirements and design experience. A semantic hierarchical representation structure of assembly tolerance is proposed in this paper to establish the mapping between the geometric feature of the part and the tolerance type as well as tolerance value. A domain ontology model for assembly tolerance design is established with OWL ontology to describe domain information while SWRL rules to enrich the semantics of domain ontology. The application of the model in the proposed hierarchical representation structure enables the consideration tolerance standards, product requirements and design experience of in computer aided tolerancing process, by which the assembly tolerance design knowledge is able to be shared effectively. The application of proposed model is verified by an instance of assembly tolerance reasoning in this paper.

Agent-Capability based Industrial Task Assignment with RFID Sensors

“…In assembly eld, Beßler et al [10] propose an assembly planning approach applying Description Logics (DL) to describe the nal form of an assembled product, and to plan the different actions to be performed during the planning process, the task is performed by only one agent. Qie et al [11] propose a semantic representation of assembly tolerance with hierarchical structure. Mapping is created between a geometric feature of a part and tolerance value.…”

Integrated approach enabling robust and tolerance design in product concept development

“…However, since UML is neither directly computer-readable nor interpretable, the Web Ontology Language (OWL) with its rigorous logic-based semantics is preferred . In addition to the sole representation and linking of relevant information, these ontology data models thus form a suitable basis for automated tolerance specification (Zhong et al 2013;Qie et al 2017;. However, ontologies have drawbacks in terms of automation and manual interaction, so that the pure use of ontology models in the context of tolerance specification is not efficient .…”

“…Ontologies are suitable for this process because of the stringent mapping of logic. In the sense of the intended reuse of existing ontology structures (Noy & MCGuinness 2001), the terms within this knowledge base are widely adopted from other ontologies for automated tolerance specification, such as Zhong et al (2013) and Qie et al (2017). Since the formalised knowledge is used for both the detailing of the concept and the tolerance specification itself, two distinct but compatible ontologies, namely, product and tolerance knowledge ontology, are developed; see Figure 2.…”

A Tolerance Specification Automatic Design Method for Screening Geometric Tolerance Types

“…Computer-aided tolerance design is the key content of the digitalisation of the intelligent manufacturing of products [1,2], in which the realisation of tolerance specification automatic generation (TSAG) is one of the key links. With the efforts of many scholars, the research on achieving the computer-aided design of tolerance specification has also made important progress: Zhang et al [3] constructed a TSAG algorithm based on a multi-colour set method; Zhang et al [4] and Qie et al [5] developed a TSAG method based on a hierarchical tolerance information representation model; and Luo et al [6] and Johannesson et al [7] proposed the adjacency matrix method to represent constraint relations of assemblies. On this basis, these methods are combined with computer technology to achieve the automatic reasoning of tolerance types for assembly parts.…”