A knowledge-based object oriented DFM advisor for surface mount PCB assembly

1995 ◽  
Vol 10 (5) ◽  
pp. 317-329 ◽  
Author(s):  
S. Krishnan ◽  
K. Srihari
Keyword(s):  
Object Oriented ◽  
Surface Mount ◽  
Pcb Assembly ◽  
Knowledge Based

Heuristic Design of a Material Processing Component

1990 ◽  
Author(s):  
Vikram R. Jamalabad ◽  
Noshir A. Langrana ◽  
Yogesh Jaluria
Keyword(s):  
Heuristic Search ◽  
Expert Knowledge ◽  
Object Oriented ◽  
Engineering Process ◽  
Efficient Design ◽  
Cross Sectional ◽  
Design Algorithm ◽  
Initial Design ◽  
Knowledge Based ◽  
Processing Component

Abstract The main thrust of this research is in developing a knowledge-based system for the design of a mechanical engineering process. The study concentrates on developing methodologies for initial design and redesign in a qualitative format. The component selected is a die for plastic extrusion. A design algorithm using best first heuristic search and expert knowledge, both in procedural and declarative form, forms the core of the process. Initial design and redesign methodologies are presented that can enable efficient design of a component using expert knowledge. Some generality has been accomplished by the implementation of the techniques to dies of different cross sectional shapes. The software is written in Lisp within an object oriented software package using analysis modules written in C.

Knowledge-Based Parametric Modeling for Nozzles

1993 ◽  
Author(s):  
Mukui Saxena ◽  
Rohinton K. Irani
Keyword(s):  
Parametric Design ◽  
Object Oriented ◽  
Parametric Modeling ◽  
Knowledge Based ◽  
Unique System ◽  
Utility System ◽  
Design Cycle ◽  
Design And Manufacturing ◽  
Mesh Generators ◽  
Product Definition

Abstract This paper describes a new, and unique, system for design and analysis of a family of parts with a specific focus on gas turbine nozzles. The system, built on the tenets of knowledge-based engineering (KBE) within an object-oriented framework, supports the notion of scalable products that can be resized through reparametrization. The KBE system for the parametric design of nozzles has been integrated with a Topology and Geometry Utility System (TAGUS) and geometry-based mesh generators (QUADTREE and EXTREME) to develop a turnkey system. The resulting system is shown to help reduce the design cycle time and to increase engineering productivity by representing design and manufacturing information as part of the complete product definition.

Using Object-Oriented Frame Language for Realizing Discrete Event Simulation

1996 ◽  
Author(s):  
Ming Dong ◽  
Jianzhong Cha ◽  
Mingcheng E
Keyword(s):  
Knowledge Base ◽  
Discrete Event Simulation ◽  
Discrete Event ◽  
Object Oriented ◽  
Simulation Models ◽  
Activity Cycle ◽  
Event Simulation ◽  
Knowledge Based ◽  
Inference Engines ◽  
Reasoning About Knowledge

Abstract In this paper, we realize knowledge-based discrete event simulation model’s representation, reasoning and implementation by means of object-oriented(OO) frame language. Firstly, a classes library of simulation models is built by using the OO frame language. And then, behaviours of simulation models can be generated by inference engines reasoning about knowledge base. Lastly, activity cycle diagrams can be used to construct simulation network logic models by connecting the components classes of simulation models. This kind of knowledge-based simulation models can effectively solve the modeling problems of complex and ill-structure systems.

A Solution Methodology for the Multiple Batch Surface Mount PCB Placement Sequence Problem

1994 ◽  
Vol 116 (4) ◽  
pp. 282-289 ◽  
Author(s):  
Yu-Wen Huang ◽  
K. Srihari ◽  
Jim Adriance ◽  
George Westby
Keyword(s):  
Printed Circuit Boards ◽  
Solution Method ◽  
Identification Problem ◽  
Circuit Boards ◽  
Surface Mount ◽  
Printed Circuit ◽  
Knowledge Based ◽  
Sequence Identification ◽  
Placement Machine ◽  
Solution Methodology

The placement of surface mount components is a time consuming and critical task in the assembly of surface mount Printed Circuit Boards (PCBs). The focus of this research was the identification of “near optimal” solutions for the placement sequence identification problem. The factors considered include the placement machine and the specific PCB, the feeder space available, the need for tooling and nozzle changes, and the actual traveling path of the placement head. Expert (or knowledge based) systems were used as the solution method for this problem. The system developed can cope with single PCBs, panels, 180 deg offset boards (panels), and multiple PCB batches. The prototype knowledge based system developed in this research identifies solutions in (almost) realtime.

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