(3) Acquisition of knowledge – the mechanism of knowledge reproduction The KBE system has a “self-generated†knowledge reproduction mechanism. This is the main difference between it and the traditional expert system. The traditional expert system relies on knowledge engineers to obtain expert knowledge manually and is less efficient. The main reason is that experts in the professional field lack understanding of the system and do not know how to provide comprehensive knowledge. However, the system engineer does not know much about the expert knowledge field and cannot effectively penetrate the essence of the problem. This situation causes the application value of the expert system. not tall. The KBE system provides a means of reproducing knowledge and broadens the way to acquire knowledge, allowing users to use the tools provided by KBE to add their own unique knowledge to extend the system.
The KBE system automates repetitive design and engineering tasks, shortens product development time, and integrates design, analysis, and manufacturing for parallel work. Using KBE to build a model can combine geometric modeling with analysis, achieve multidisciplinary optimization, and accurately evaluate the feasibility, apply standards and practical experience to improve product quality, and digitally acquire knowledge information such as design practice and process experience. And reuse to increase the efficiency of the automation process.
Third, UG knowledge-driven automation
As a CAD/CAM/CAE integration software, UG is dedicated to the entire product development process from concept design to functional analysis, engineering drawing generation, NC code generation and processing. UG provides a Knowledge Driven Automation solution that fully integrates the KBE system with the CAx software system. KDA is a system that records and reuses engineering knowledge and is used to drive, build, select, and assemble geometric models. The solution includes UG/KF (Knowledge Fusion) and a series of process wizards.
Past KBE systems are often used separately and cannot be embedded in existing engineering systems and cannot be related to existing applications. UG/KF solves this problem. Since UG/KF is fully embedded, users don't need to know what KBE is and what UG/KF is. Just use the familiar application to achieve reuse of various knowledge. Therefore, UG/KF is for most engineers. This means that engineers and designers can focus on product development without having to convert data between the KBE system and the product development system.
The UG/KF language is an object-oriented language based on the Intent language. The Intent language is an industry-recognized, completely rule-based knowledge programming language that is primarily described by classes, and its applications can be executed without compilation. Users can use a general text editor to browse and modify the KBE program, thus achieving the openness of the program, so that engineering knowledge can be updated, supplemented and maintained at any time.
UG's KDA scheme uses "Rules" to represent the interrelationship between different geometric and engineering properties of a product. Users use the KF language to build their own rules and use rules to easily add knowledge. Since this language is declarative rather than procedural, there is no order in the rules. The UG/KF system automatically judges the execution order based on the relationship between the rules. These rules are used to calculate the impact of engineering parameters on the product's geometric parameters to drive the final geometric model. In addition, the language can access external sources of knowledge, such as databases or spreadsheets, and provide interfaces to other application modules such as analysis and optimization modules. At the same time, UG provides a rich class of KF. A KF class is a collection of KF rules that implement a task. Users can also create their own classes in KF.
UG provides a visual tool - the KF Navigator (Knowledge Fusion Navigator). Users can use the navigator to create, retrieve, and reuse knowledge rules to drive geometry generation. Users can directly add sub-rules (create instances of classes), edit sub-rules (edit parameters in instances), add properties (add user-defined properties for instances), and reference other properties through a visual interface.
The rules created by the users themselves must be reusable, which is the basic requirement of the KBE system. KF technology links rules to UG objects and maintains this correlation. Users use rules to control UG objects. In this way, the reuse of its related rules is achieved when the object is created.
UG uses Generative and Adoption to integrate knowledge with the CAx system. In particular, the absorption mechanism addresses the existing mature products and practices.
Previous page
Forstner bits, flat-bottomed to drill holes in wood materials, they can cut on the edge of a block of wood, and can cut overlapping holes; for such applications they are normally used in drill presses or lathes rather than in hand-held electric drills. Because of the flat bottom of the hole, they are useful for drilling through veneer already glued to add an inlay.
The bit includes a center point which guides it throughout the cut (and incidentally spoils the otherwise flat bottom of the hole). The cylindrical cutter around the perimeter shears the wood fibers at the edge of the bore, and also helps guide the bit into the material more precisely.
Forstner bits have radial cutting edges to plane off the material at the bottom of the hole. The bits shown in the images have two radial edges; other designs may have more. Forstner bits have no mechanism to clear chips from the hole, and therefore must be pulled out periodically.
Forstner Bits,bosch forstner bits,colt forstner bits
Behappy Crafts (suzhou)Co.,Ltd , https://www.behappyindustry.com