MFS606/ME606/EE606 • Introdu Introducto ctory ry lecture lecture – – engineer engineering ing design design process process
Example past projects • Design of product product for for manuf manufact acturab urabilit ility y (for prosthe prosthetic tic device), device), and design of manufacturing system • Design of met methodolog hodology y for collection collection of item items s from wareh warehouse ouse • Design of improved improved autom automated ated material handling system system to reduce reduce errors • Impr Improve ovem ment of work workcell cells s • Improve Improvem ment of warehou warehousing sing operat operations ions • Redesign Redesign of shipp shipping ing depart departm ment • Redesign of processes for improv improved ed mat material erial handlin handling g and transpo transport rt • Analysis of flow of product product,, with with redesign redesign recomm recommendation endations s • Development Development of Control methods methods for for automat automated ed equipm equipment ent
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Typ Typical Issu Issue es • Evalua valuattion of waste – F low, low, tim time, cost, mot motion ion
• Manufactu Manufacturing ring system design – Recomm ecommendations endations for modificat modifications ions
• Mechanical design (and (and somet sometim imes es electrical design)
The The Eng Engineering Desi sig gn P rocess •Recognizing the need –What is the problem?
•Defining the P roblem –Goals, Objectives, Constraints
•P lanning the the Project P roject – Schedule and budget of Activities Activities –What tasks, in what order
•Conceptualizing Alternative Approaches –Generate wide variety of alternatives
•Evaluating the alternatives – Analysis of performan performance ce
•Selecting the best alternative •Communicating the Design •Implementation of the preferred design
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P roblem F ormulat ormulation ion • Design failures failures often traced traced to to inadequat inadequate e problem formulation ulation • Cost of change change increases increases as design design progr progresses esses • Key Key ste steps: – Deter Determ mining ining the need need – Defin Defining ing the probl problem em
Recognizing the Need • Ident Identif ifyi ying ng the Client Client • Does the the client client know know what what they they want want? ? – Issue: Confusing Confusing a pote potent ntial ial soluti solution on with with actual actual need need
• Whydo Why does es the the clien clientt wan wantt this? his? • Needs Sta S tate tem mentdef ent defines ines current current unsat unsatisfact isfactory ory situat situation ion • Exa Example: – “Current test test procedures procedures for the Widgim Widgimatic atic are too too time intensive” intensive”
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Defining the the Prob P roblem lem 3 parts: parts: Goals, Goals, Objectives, Objectives, Constr C onstraint aints s • Goal: – Brief and gener general al and ideal ideal state stateme ment nt – “How are are we going going to address address the the need” need” – Example Goal: “To design an improved improved test fixture fixture for the Widgimatic” Widgimatic” – Rules out other other solut solutions ions to to Needs stat statem ement ent
Objectives • Objectives Objectives =quan =quantif tifiable iable expect expectation ations s of perform performance ance of design • Exam Example ple Obj Object ectiv ive: e: – “Design a fixture fixture that that allows allows loading and unloading unloading of items items in less than than 5 seconds, and which automatically sequences through the testing conditions” (assuming same test conditions as before?)
• Objectives Objectives can be refined refined later while while keeping keeping the the general general goal goal
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Constraints • Constraints: Constraints: Requirement Requirements s that that the the design must must satisfy • Define perm permissible issible range of design design and perform performance ance param parameter eters s • Exa Example: – The Widgim Widgimat atic ic dimension dimension cannot cannot be modif modified ied – The test test requir requires es 110VAC 110VAC power power for for the the product product – The fixture fixture must be able to to test test at least 1000 1000 Widgimat Widgimatics ics per shift – Cost Cos t of the the fixture fixture must must have payback payback in time savings within within 6 month months s
• Constrain Constraints ts can becom become e part part of obje objecti ctives ves
P roblem St Statement atement Sum Summ mary • • • •
Need Needs s Stat Statem emen entt Goal Goal Stat Statem ement ent Obj Objectives Con Constr straint ints
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Planning the project • P lanni lanning ng the P roject roject – Schedu chedule le of Activ Activities ities • Gantt Gantt Chart hart • P ert ert Chart Chart
– Cost of Activ Activit ities ies • P ersonnel ersonnel tim time e • Budget constrain constraintts
Design Design J our ournal • P ermanent anently ly boun bound d noteb notebook ook or diary diary • Dated entries entries of thoug thoughts, hts, activit activities, ies, notes, sketches, sketches, calculations, calculations, etc. related to your design projects. – Central Central record record of all activit activity y and infor inform mation ation – Chronologi Chronological cal record—f record—for or patent or liabilit liability y – Documentat Documentation of time for budgeting budgeting and and billing
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E arly Design: Design: Concept Generat eneration ion • Key: Key: Genera Generatte Alter Alterna nattives ives • Tech Techn niqu iques: es: – Brai Brains nsttorm orming ing • • • •
Let imaginat agination ion run run wild wild Avoid Avoid movi moving ng to to detail detail Avoid critiq critiquing uing of any concepts Problem: dominat domination ion by a few team members embers
Evaluating the alternatives • Cost anal analy ysis – Lab Labor – Equip quipm ment ent – P ayb ayback ack
• Implem Implement entat ation ion issues • P erfo erform rman ance ce issues issues
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The The Eng Engineering Desi sig gn P rocess •Recognizing the need –What is the problem?
•Defining the P roblem –Goals, Objectives, Constraints
•P lanning the the Project P roject – Schedule and budget of Activities Activities –What tasks, in what order
•Conceptualizing Alternative Approaches –Generate wide variety of alternatives
•Evaluating the alternatives – Analysis of performan performance ce
•Selecting the best alternative •Communicating the Design •Implementation of the preferred design
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