Decision Support System to Predict the Manufacturing Yield of Printed Circuit Board Assembly Lines

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dc.contributor.authorHelo, Felipeen
dc.contributor.committeecochairKobza, John E.en
dc.contributor.committeecochairEllis, Kimberly P.en
dc.contributor.committeememberNachlas, Joel A.en
dc.contributor.departmentIndustrial and Systems Engineeringen
dc.date.accessioned2011-08-06T16:02:41Zen
dc.date.adate2000-05-19en
dc.date.available2011-08-06T16:02:41Zen
dc.date.issued1999-12-01en
dc.date.rdate2001-05-19en
dc.date.sdate2000-05-17en
dc.description.abstractThis research focuses on developing a model to predict the yield of a printed circuit board manufactured on a given assembly line. Based on an extensive literature review as well as discussion with industrial partners, it was determined that there is no tool available for assisting engineers in determining reliable estimates of their production capabilities as they introduce new board designs onto their current production lines. Motivated by this need, a more in-depth study of manufacturing yield as well as the electronic assembly process was undertaken. The relevant literature research was divided into three main fields: process modeling, board design, and PCB testing. The model presented in this research combines elements from process modeling and board design into a single yield model. An optimization model was formulated to determine the fault probabilities that minimize the difference between actual yield values and predicted yield values. This model determines fault probabilities (per component type) based on past production yields for the different board designs assembled. These probabilities are then used to estimate the yields of future board designs. Two different yield models were tested and their assumptions regarding the nature of the faults were validated. The model that assumes independence between faults provided better yield predictions. A preliminary case study was performed to compare the performance of the presented model with that of previous models using data available from the literature. The proposed yield model predicts yield within 3% of the actual yield value, outperforming previous regression models that predicted yield within 10%, and artificial neural network models that predicted yield within 5%. A second case study was performed using data gathered from actual production lines. The proposed yield model continued to provide very good yield predictions. The average difference with respect to the actual yields from this case study ranged between 1.25% and 2.27% for the lines studied. Through sensitivity analysis, it was determined that certain component types have a considerably higher effect on yield than others. Once the proposed yield model is implemented, design suggestions can be made to account for manufacturability issues during the design process.en
dc.description.degreeMaster of Scienceen
dc.format.mediumETDen
dc.identifier.otheretd-05172000-10350003en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-05172000-10350003en
dc.identifier.urihttp://hdl.handle.net/10919/10036en
dc.publisherVirginia Techen
dc.relation.haspartETDfhelo1b.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectSurface Mounten
dc.subjectFault Coverageen
dc.subjectPrinted Circuit Boarden
dc.subjectDefect-levelen
dc.subjectYielden
dc.titleDecision Support System to Predict the Manufacturing Yield of Printed Circuit Board Assembly Linesen
dc.typeThesisen
thesis.degree.disciplineIndustrial and Systems Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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