{VERSION 5 0 "SUN SPARC SOLARIS" "5.0" } {USTYLETAB {CSTYLE "Maple Input" -1 0 "Courier" 0 1 255 0 0 1 0 1 0 0 1 0 0 0 0 1 }{CSTYLE "2D Math" -1 2 "Times" 0 1 0 0 0 0 0 0 2 0 0 0 0 0 0 1 }{CSTYLE "2D Output" 2 20 "" 0 1 0 0 255 1 0 0 0 0 0 0 0 0 0 1 } {CSTYLE "" -1 256 "" 0 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 }{CSTYLE "" -1 257 "" 0 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 }{CSTYLE "" -1 258 "" 0 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 }{CSTYLE "" -1 259 "" 0 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 }{CSTYLE "" -1 260 "" 0 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 } {CSTYLE "" -1 261 "" 0 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 }{CSTYLE "" -1 262 "" 1 14 0 0 0 0 0 1 0 0 0 0 0 0 0 0 }{CSTYLE "" -1 263 "" 0 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 }{CSTYLE "" -1 264 "" 0 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 }{PSTYLE "Normal" -1 0 1 {CSTYLE "" -1 -1 "" 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 }0 0 0 -1 -1 -1 0 0 0 0 0 0 -1 0 }{PSTYLE "Text Output " -1 2 1 {CSTYLE "" -1 -1 "Courier" 1 10 0 0 255 1 0 0 0 0 0 1 3 0 3 0 }1 0 0 -1 -1 -1 0 0 0 0 0 0 -1 0 }{PSTYLE "Warning" 2 7 1 {CSTYLE " " -1 -1 "" 0 1 0 0 255 1 0 0 0 0 0 0 1 0 0 0 }0 0 0 -1 -1 -1 0 0 0 0 0 0 -1 0 }{PSTYLE "Maple Output" 0 11 1 {CSTYLE "" -1 -1 "" 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 }3 3 0 -1 -1 -1 0 0 0 0 0 0 -1 0 }{PSTYLE "Maple Plot" 0 13 1 {CSTYLE "" -1 -1 "" 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 }3 0 0 -1 -1 -1 0 0 0 0 0 0 -1 0 }{PSTYLE "" 0 256 1 {CSTYLE "" -1 -1 "" 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 }3 0 0 -1 -1 -1 0 0 0 0 0 0 -1 0 } {PSTYLE "" 0 257 1 {CSTYLE "" -1 -1 "" 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 }3 0 0 -1 -1 -1 0 0 0 0 0 0 -1 0 }{PSTYLE "" 0 258 1 {CSTYLE "" -1 -1 "" 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 }3 0 0 -1 -1 -1 0 0 0 0 0 0 -1 0 }} {SECT 0 {PARA 256 "" 0 "" {TEXT -1 11 "Math 2250-3" }}{PARA 257 "" 0 " " {TEXT -1 20 "Wednesday October 29" }}{PARA 258 "" 0 "" {TEXT 259 0 " " }{TEXT -1 21 "Solving DE's in Maple" }}{PARA 0 "" 0 "" {TEXT -1 0 " " }}{PARA 0 "" 0 "" {TEXT -1 190 "These notes discuss material from se ctions 5.5 and 5.6 of the text, in the context of Maple. They are on line at our Maple page, go to www.math.utah.edu/~korevaar/2250fall03/2 250maple.html." }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT 256 43 "Part 1: checking homework problems on Maple" }}{PARA 0 " " 0 "" {TEXT -1 52 " Here's a homework problem worked out in Maple , " }{TEXT 260 20 "#12 from section 5.5" }{TEXT -1 127 ". This proble m was fairly painful to work by hand. For more information on the com mands which are used, use the Help files. " }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 35 "with(DEtools): #D E command library" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 125 "f:=x- >2-sin(x): #inhomogeneous term\ndeqtn:=diff(y(x),x,x,x)+ diff(y(x),x) =f(x):\n #the differential equation, #12 page 337." }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 19 "dsolve(deqtn,y(x));" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#/-%\"yG6#%\"xG,.*&%$_C2G\"\"\"-%$cosGF&F+!\"\"*&%$_C1GF +-%$sinGF&F+F+F,F+*&#F+\"\"#F+*&F'F+F1F+F+F+*&F5F+F'F+F+%$_C3GF+" }}} {PARA 0 "" 0 "" {TEXT -1 102 "Discarding the pieces which solve the ho mogeneous equation, the simplest particular solution we see is" }} {EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 24 "yp:=x->1/2*x*sin(x)+2*x;" }} {PARA 11 "" 1 "" {XPPMATH 20 "6#>%#ypGf*6#%\"xG6\"6$%)operatorG%&arrow GF(,&*&#\"\"\"\"\"#F/*&9$F/-%$sinG6#F2F/F/F/*&F0F/F2F/F/F(F(F(" }}} {PARA 0 "" 0 "" {TEXT -1 298 "The method of guessing as modified for p roblems when the guess for yp involves homogeneous equation solutions, would have had us to a guess of the form yp=Ax + x(Bsin(x)+Ccos(x)) . The algebra in computing L(yp) was messy. We could check the algeb ra part of our work as well as the final answer:" }}{EXCHG {PARA 0 "> \+ " 0 "" {MPLTEXT 1 0 33 "yp:=x->A*x+x*B*sin(x)+x*C*cos(x);" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%#ypGf*6#%\"xG6\"6$%)operatorG%&arrowGF(,(*&% \"AG\"\"\"9$F/F/*(F0F/%\"BGF/-%$sinG6#F0F/F/*(F0F/%\"CGF/-%$cosGF5F/F/ F(F(F(" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 41 "diff(yp(x),x,x,x) +diff(yp(x),x)=2-sin(x);" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#/,(*(\"\"# \"\"\"%\"BGF'-%$sinG6#%\"xGF'!\"\"*(F&F'%\"CGF'-%$cosGF+F'F-%\"AGF',&F &F'F)F-" }}}{PARA 0 "" 0 "" {TEXT -1 101 "Equating coefficients we see that -2B=-1, C=0, and A=2. This leads to yp=(1/2)xsin(x)+2x, as befo re." }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 5 " \+ " }{TEXT 261 14 "How about #37?" }}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 246 "f:=x->1+x*exp(x): #right hand side, then DE:\ndeqtn := diff(y(x),x,x,x) -2*diff(y(x),x,x) \n + diff(y(x),x) =f(x);\nic s:=y(0)=0, D(y)(0)=0, D(D(y))(0)=1:\n #initial conditions...see h elp files for syntax! \nans37:=dsolve(\{deqtn,ics\},y(x));\n " }} {PARA 11 "" 1 "" {XPPMATH 20 "6#>%&deqtnG/,(-%%diffG6$-%\"yG6#%\"xG-% \"$G6$F-\"\"$\"\"\"*&\"\"#F2-F(6$F*-F/6$F-F4F2!\"\"-F(6$F*F-F2,&F2F2*& F-F2-%$expGF,F2F2" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%&ans37G/-%\"yG6 #%\"xG,.*&\"\"%\"\"\"-%$expGF(F-!\"\"*(\"\"$F-F)F-F.F-F-*&#F-\"\"'F-*& )F)F2F-F.F-F-F-*&#F-\"\"#F-*&)F)F:F-F.F-F-F0F)F-F,F-" }}}{PAGEBK } {PARA 0 "" 0 "" {TEXT 262 28 "Part 2: Forced Oscillators:" }}{PARA 0 "" 0 "" {TEXT 263 18 "Example 1 page 340" }}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 95 "with(plots):\nplot(5*cos(3*t)-5*cos(5*t),t=0..6*Pi,co 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with angular frequency w0. When w and w0 as well as the corresponding amplitudes are close, the system exhibits " }{TEXT 258 7 "beating" }{TEXT -1 59 ". Musicians tune their instruments using t his phenomenon." }}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 68 "restart:w ith(DEtools):with(plots):\n #I want to undefine m, x0 etc." }}{PARA 7 "" 1 "" {TEXT -1 50 "Warning, the name changecoords has been redefin ed\n" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 132 "deqtn1a:=diff(x(t) ,t,t) + w0^2*x(t) = (F0/m)*cos(w*t);\n #this is the case w not equal to w0,\n #I divided the model equation by m" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%(deqtn1aG/,&-%%diffG6$-%\"xG6#%\"tG-%\"$G6$F-\"\"#\" \"\"*&)%#w0GF1F2F*F2F2*(%#F0GF2%\"mG!\"\"-%$cosG6#*&%\"wGF2F-F2F2" }}} {EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 115 "dsolve(deqtn1a,x(t));\n #g eneral solution, equal to particular\n #solution plus general homogen eous eqtn solution. " }}{PARA 11 "" 1 "" {XPPMATH 20 "6#/-%\"xG6#%\"tG ,(*&-%$sinG6#*&%#w0G\"\"\"F'F/F/%$_C2GF/F/*&-%$cosGF,F/%$_C1GF/F/**%#F 0GF/-F36#*&%\"wGF/F'F/F/%\"mG!\"\",&*$)F.\"\"#F/F/*$)F:F@F/F " 0 "" {MPLTEXT 1 0 85 "sol4:=dsolve(\{deqtn1a,x(0)= 0,D(x)(0)=0\},x(t));\n #a nice choice of initial conditions" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%%sol4G/-%\"xG6#%\"tG,&**-%$cosG6#*&%#w0G\" \"\"F)F1F1%#F0GF1%\"mG!\"\",&*$)F0\"\"#F1F4*$)%\"wGF8F1F1F4F1**F2F1-F- 6#*&F;F1F)F1F1F3F4,&F6F1F9F4F4F1" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 64 "sol5:=subs(\{w=45,w0=55,F0=50,m=.1\},sol4);\n #Exam ple 2 page 342" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%%sol5G/-%\"xG6#%\" tG,&*&$\"+++++]!#5\"\"\"-%$cosG6#,$*&\"#bF/F)F/F/F/!\"\"*&$\"+++++]F.F /-F16#,$*&\"#XF/F)F/F/F/F/" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 220 "actual:=plot(rhs(sol5),t=0..3, color=black):\nenvel1:=plot(sin(5* t),t=0..3,color=black,linestyle=2):\nenvel2:=plot(-sin(5*t),t=0..3,col or=black,linestyle=2):\ndisplay(\{actual, envel1,envel2\},title=`Figur e 5.6.3 page 342`); " }}{PARA 13 "" 1 "" {GLPLOT2D 400 222 222 {PLOTDATA 2 "6(-%'CURVESG6$7h`n7$$\"\"!F)F(7$$\"3s******\\i9Rl!#>$!3uI 33_$[!*4%F-7$$\"3:+vVtdN]sF-$!3og$*Ro@()[;!#=7$$\"3f+](oHl:'zF-$!3SMs^ WV\\%)GF57$$\"3.,DJ?[xs')F-$!3#o/&*G$>A3RF57$$\"32++vVV)RQ*F-$!3'pDdRK \"y?XF57$$\"3=v$4Ys'yh&*F-$!30]uF]X/!f%F57$$\"3!*[(oa5*eR(*F-$!3^fD%Q( Qt@YF57$$\"3,C\"Gj[\"R<**F-$!35+m`T!pVh%F57$$\"3\"*\\(=nQ>&45F5$!3\\(e lVH5oc%F57$$\"3$\\i!*G')z]/\"F5$!3!fDy6-j$[VF57$$\"3&**\\i!R.k!3\"F5$! 3V*[**Rg3Z'RF57$$\"3)\\PM_\"3?;6F5$!3oafLbxW?MF57$$\"3+]iS\"Hh<:\"F5$! 3ww6]qhaEFF57$$\"3,D\"yvw@t=\"F5$!3PM)3%*[m,!>F57$$\"3/++vVA)GA\"F5$!3 3sX(3<9Dk*F-7$$\"3Bv$f$=P(GE\"F5$\"3Sc:&[5n/%=F-7$$\"39](oH>lGI\"F5$\" 3JVN4_1-*Q\"F57$$\"30D\"yvmcGM\"F5$\"3'zAy:B\"e*f#F57$$\"3'**\\(=U\"[G Q\"F5$\"37+\\0%*y-iPF57$$\"3)[(oz;'RGU\"F5$\"3[5A:3n[A[F57$$\"30]iS\"4 JGY\"F5$\"3Z*zfB?P%HdF57$$\"3DDc,mD#G]\"F5$\"3,osL6&3iV'F57$$\"3;+]iSS \"Ga\"F5$\"3eoXO:TK.pF57$$\"3h(oHzx4Gc\"F5$\"31f]D^-;PqF57$$\"32vVB:b! 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(1/2)*F0*t*sin(w0*t)/(w0*m);" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%#xpG f*6#%\"tG6\"6$%)operatorG%&arrowGF(,$*&#\"\"\"\"\"#F/*,%#F0GF/9$F/-%$s inG6#*&%#w0GF/F3F/F/F8!\"\"%\"mGF9F/F/F(F(F(" }}}{PARA 0 "" 0 "" {TEXT -1 102 "You can see that xp(t) solves the initial value problem x0=v0=0, i.e. the system initially at rest. 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