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MEC 400 –INTRODUCTION TO ENGINEERING

AND PROBLEM SOLVING

CHAPTER 3Engineering Solu ion

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Objectives◦ Understand general concepts in analysis of engineering problems◦ Understand the format of problem organization and presentation◦ Use of software in problem presentation

Engineering analysis definition:◦ U!e o" #$ %e#$ i&$l $n' !&ien i(& )rin&i)le! o *eri"+ %e

)er"or#$n&e o" $l ern$ i*e !olu ion! or !+! e#!,◦ An$l+!i! nor#$ll+ in*ol*e %ree $re$!-

A))li&$ ion o" %e l$.! o" n$ ureA))li&$ ion o" %e l$.! o" e&ono#i&

A))li&$ ion o" &o##on !en!e

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Engineering method-analysis procedure◦ Consist of 6 basic steps

! "ecognize and understand the problem!#! $ccumulate data and verify accuracy%!&elect the appropriate theory or principle'! (a)e necessary assumption*! &olve the problem

6! +erify and chec) result

! "ecognize and understand the problem!(ust be able to recognize and define problem precisely!,f problem not well define considerable effort must be e.pended at the

beginning in studying the problem eliminating things that are notimportant and focus on root problem!

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#! $ccumulate data and verify accuracy $ll physical facts eg: temperature voltage etc must be ascertained!/eal only with items that can be verified!

3, Sele& %e $))ro)ri$ e %eor+ or )rin&i)leSele& $))ro)ri$ e %eor+ %$ $))l+ o !olu ion o" )ro/le#Un'er! $n' $n' i'en i"+ li#i $ ion! or &on! r$in ! %$ $))l+ o

%eor+

'! (a)e necessary assumptionCertain assumptions can be made that do not significantly affcet theaccuracy of solutions!

*! &olve the problem

6! +erify and chec) result&olutions must be chec)ed to ensure mathematically correct and unitsproperly specified!

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0roblem statement:&tate as concisely as possible the problem to be solved

/iagram:0repared a diagram with all pertinent dimensions flow rate etc!!/ata that cannot be placed in the diagram should be listed separately!

1heory:1he theory used should be presented0roperly referenced e2uation with completely defined variables is sufficient!

$ssumption:E.plicitly list in complete detail any and all pertinent assumptionsthat have been made to realize your solution to the problem

&olution steps:&how completely all steps ta)en in obtaining the solution!,dentify result and verify accuracy:

Clearly identify 3double underline4 the final answer! $ssign proper units!

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T%e !ol*e' )ro/le#! $re o /e )re!en e' $&&or'ing o &er $in! $n'$r'! or rule!, T%i! i! o en!ure %$ o %er )eo)le %$*e no'i &ul + in un'er! $n'ing %e !olu ion!, Pre!en $ ion o" !olu ion! o"

%e )ro/le# i! 1u! $! i#)or $n $! !ol*ing %e )ro/le# i !el",

Guidelines (know what you write-write what you know)5 U!e $n engineering2)ro/le# )$)er, I" no $*$il

5 On %e o) %e$'ing o" %e )$)er .ri e "ull n$#e &our!e nu#/er i leo" %e )ro/le# )ro/le# nu#/er !5 'ue '$ e $n' !%ee nu#/er )er

%e o $l nu#/er in %e !e ,

5 U!e $ pencil )re"er$/l+ H or 6H or HB5 r$ %er %$n $ )en in .ri ing$n' 'r$.ing,

5 7ri e .i % legible le ering $n' %$r' enoug% "or e$!+&o#)re%en!ion, M$8e !ure %$ %e spelling i! &orre& ,

5

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5 7or8 #u! /e &le$r e$!+ o "ollo. $n' un2&ro.'e', Con inue line

$" er line, Avoid going /$&8 o /l$n8 !)$&e in %e )re*iou! line!, I#$+ &$u!e &on"u!ion $n' 'i &ul o "ollo.,

5 Dr$. $ %ori:on $l ! r$ig% line $&ro!! %e )$ge /e"ore ! $r ing $ne. )ro/le#, Do not start $ ne. )ro/le# on %e !$#e )$geunle!! i &$n /e &o#)le e' on %$ !$#e )$ge,

5 Dr$. $n' l$/el %e ne&e!!$r+ 'i$gr$#! ne$ l+, U!e ruler oi#)ro*e %e $))e$r$n&e o" +our .or8, Ho.e*er o" en $ "ree%$n'!8e &% i! !u &ien ,

5 E#)lo+ proper symbols o re)re!en $ !e o" )%+!i&$l ;u$n i ie!

'i#en!ion! uni ! )$r$#e er! &on! $n ! e &, 7%ene*er )o!!i/leuse universally accepted symbols $n' /e &on!i! en%roug%ou )ro/le#

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Calculator facilitates calculation especially when it involves repeated andcomple. calculation! 0rogrammable calculator and computer are employedespecially in computer graphics and integrated data base and othervoluminous calculation or operation! $fter ac2uiring basics and fundamentalin science and mathematics with understanding an engineer may then usethese devices for speed and iterative wor)!