{VERSION 3 0 "IBM INTEL NT" "3.0" } {USTYLETAB {CSTYLE "Maple Input" -1 0 "Courier" 0 1 255 0 0 1 0 1 0 0 1 0 0 0 0 }{CSTYLE "2D Math" -1 2 "Times" 0 1 0 0 0 0 0 0 2 0 0 0 0 0 0 }{CSTYLE "2D Output" 2 20 "" 0 1 0 0 255 1 0 0 0 0 0 0 0 0 0 } {CSTYLE "" -1 256 "" 0 1 0 0 0 0 0 1 0 0 0 0 0 0 0 }{CSTYLE "" -1 257 "" 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 }{CSTYLE "" -1 258 "" 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 }{CSTYLE "" -1 259 "" 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 } {CSTYLE "" -1 260 "" 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 }{CSTYLE "" -1 261 "" 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 }{CSTYLE "" -1 262 "" 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 }{CSTYLE "" -1 263 "" 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 } {CSTYLE "" -1 264 "" 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 }{CSTYLE "" -1 265 "" 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 }{CSTYLE "" -1 266 "" 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 }{CSTYLE "" -1 267 "" 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 } {CSTYLE "" -1 268 "" 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 }{CSTYLE "" -1 269 "" 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 }{CSTYLE "" -1 270 "" 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 }{CSTYLE "" -1 271 "" 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 } {CSTYLE "" -1 272 "" 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 }{CSTYLE "" -1 273 "" 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 }{CSTYLE "" -1 274 "" 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 }{CSTYLE "" -1 275 "" 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 } {CSTYLE "" -1 276 "" 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 }{CSTYLE "" -1 277 "" 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 }{CSTYLE "" -1 278 "" 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 }{CSTYLE "" -1 279 "" 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 } {CSTYLE "" -1 280 "" 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 }{CSTYLE "" -1 281 "" 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 }{CSTYLE "" -1 282 "" 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 }{CSTYLE "" -1 283 "" 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 } {CSTYLE "" -1 284 "" 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 }{CSTYLE "" -1 285 "" 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 }{CSTYLE "" -1 286 "" 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 }{CSTYLE "" -1 287 "" 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 } {CSTYLE "" -1 288 "" 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 }{CSTYLE "" -1 289 "" 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 }{CSTYLE "" -1 290 "" 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 }{CSTYLE "" -1 291 "" 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 } {CSTYLE "" -1 292 "" 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 }{CSTYLE "" -1 293 "" 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 }{CSTYLE "" -1 294 "" 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 }{CSTYLE "" -1 295 "" 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 } {CSTYLE "" -1 296 "" 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 }{CSTYLE "" -1 297 "" 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 }{CSTYLE "" -1 298 "" 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 }{CSTYLE "" -1 299 "" 0 1 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 -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 }3 3 0 -1 -1 -1 0 0 0 0 0 0 -1 0 }{PSTYLE "" 11 12 1 {CSTYLE "" -1 -1 "" 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 }1 0 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 }3 0 0 -1 -1 -1 0 0 0 0 0 0 -1 0 }} {SECT 0 {EXCHG {PARA 0 "" 0 "" {TEXT 256 30 "Harmonic oscillator anima tions" }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 51 " Martha Abell and James Braselton in their textbook " }{TEXT 277 35 "Di fferential Equations with Maple V" }{TEXT -1 243 " (Academic Press) pr ovide some lines of code that allow to show movies of the mass-spring \+ system by connecting straigh-line segments to depict a spring. The ide a is to use the solution to the differential equation for the harmonic oscillator, " }{TEXT 257 1 "y" }{TEXT -1 1 "(" }{TEXT 258 1 "t" } {TEXT -1 180 "), which provides the location of the moving endpoint of the spring, i.e., the attached mass as a function of time. We begin b y providing the solution to the differential equation." }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 218 "The parameters are \+ the mass and the spring constant, as well as the gravitational acceler ation. We work implicitly in MKSA (SI) units, and pick values after th e set-up of the equation and solution for the general case:" }}{PARA 0 "" 0 "" {TEXT -1 1 "[" }{TEXT 260 1 "g" }{TEXT -1 25 " is measured i n m/sec^2, " }{TEXT 259 1 "m" }{TEXT -1 8 " in kg, " }{TEXT 261 1 "k" }{TEXT -1 8 " in N/m]" }{TEXT 262 0 "" }{TEXT -1 0 "" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 12 "with(plots):" }}}{EXCHG {PARA 0 "> " 0 " " {MPLTEXT 1 0 23 "g:='g': m:='m': k:='k':" }}}{EXCHG {PARA 0 "" 0 "" {TEXT -1 55 "The forces acting on the mass are gravity (in the form " }{TEXT 272 1 "F" }{TEXT -1 1 "_" }{TEXT 273 1 "y" }{TEXT -1 4 " = -" } {TEXT 274 2 "mg" }{TEXT -1 149 ", i.e., position-independent at the su rface of the Earth), and the spring force given by Hooke's law, which \+ counteracts the motion from equilibrium, " }{TEXT 271 1 "F" }{TEXT -1 6 "_H =- " }{TEXT 270 1 "k" }{TEXT -1 1 "(" }{TEXT 269 1 "y" }{TEXT -1 1 "-" }{TEXT 268 1 "y" }{TEXT -1 7 "0). If " }{TEXT 267 1 "y" } {TEXT -1 17 " is greater than " }{TEXT 266 1 "y" }{TEXT -1 41 "0, the \+ force accelerates in the negative " }{TEXT 265 1 "y" }{TEXT -1 27 " di rection, and vice versa." }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 " " 0 "" {TEXT -1 972 "Note that one can make different kinds of springs : the usual springs encountered occasionally are tightly wound, and ar e to be stretched only (e.g., a slinky), but we know coil springs from car/motorcycle/bicycle suspensions that can be both stretched and com pressed. With gravity present a tightly wound spring with a mass attac hed acquires an equilibrium point from which the spring can be both co mpressed and further stretched, i.e., the equilibrium point is no long er given as the length of the spring. The equilibrium point is determi ned as the point at which the gravitational attraction to the Earth's \+ surface is balanced by the spring force which results from expanding t he spring from its original equilibrium point to suspend the mass. We \+ assume for simplicity that we have a stretch-only spring, which is ide alized to be of zero length when totally compressed (natural state). T he equilibrium position for the mass-spring system under gravity becom es (we label " }{TEXT 275 1 "y" }{TEXT -1 112 "1 now as the height at \+ which the system balances, the original balancing position that enters Hooke's law being " }{TEXT 276 1 "y" }{TEXT -1 5 "0=0):" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 16 "y0:=0; y1:='y1':" }}{PARA 11 "" 1 " " {XPPMATH 20 "6#>%#y0G\"\"!" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 22 "EQL:=-m*g-k*(y1-y0)=0;" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%$EQL G/,&*&%\"mG\"\"\"%\"gGF)!\"\"*&%\"kGF)%#y1GF)F+\"\"!" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 18 "y1:=solve(EQL,y1);" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%#y1G,$*&*&%\"mG\"\"\"%\"gGF)\"\"\"%\"kG!\"\"!\"\"" }} }{EXCHG {PARA 0 "" 0 "" {TEXT -1 52 "We measure the displacement of th e mass starting at " }{TEXT 263 1 "y" }{TEXT -1 107 "=0 (this being th e equilibrium point without any mass attached) using the conventional \+ direction (positive " }{TEXT 264 1 "y" }{TEXT -1 58 " is upwards). The gravitational acceleration therefore is " }{TEXT 280 1 "F" }{TEXT -1 1 "_" }{TEXT 279 1 "y" }{TEXT -1 2 "=-" }{TEXT 278 2 "mg" }{TEXT -1 32 ". The Newton equation now reads:" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 38 "NE:=m*diff(y(t),t$2)=-m*g-k*(y(t)-y0);" }}{PARA 11 " " 1 "" {XPPMATH 20 "6#>%#NEG/*&%\"mG\"\"\"-%%diffG6$-%\"yG6#%\"tG-%\"$ G6$F/\"\"#F(,&*&F'\"\"\"%\"gGF(!\"\"*&%\"kGF(F,F(F8" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 21 "sol:=dsolve(NE,y(t));" }}{PARA 11 "" 1 " " {XPPMATH 20 "6#>%$solG/-%\"yG6#%\"tG,(*&*&%\"mG\"\"\"%\"gGF.\"\"\"% \"kG!\"\"!\"\"*&%$_C1GF.-%$sinG6#*&-%%sqrtG6#*&F1F0F-F2F0F)F.F.F.*&%$_ C2GF.-%$cosGF8F.F." }}}{EXCHG {PARA 0 "" 0 "" {TEXT -1 659 "While ever y physics student definitely should be able to derive this general ans wer to the differential equation by hand, we assume that s/he can at l east verify that the solution found by Maple is correct by substitutio n. We have two integration constants to be determined by the initial c onditions. One typical condition is to release the system from rest at an arbitrary height. We could take the general solution, find the vel ocity expression by differentiation, and determine _C1 and _C2. Altern atively, we can specify the initial conditions, so that dsolve comes u p with the special solution of interest. We pick some arbitrary height and zero velocity." }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 24 "IC:= y(0)=-0.2,D(y)(0)=0;" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%#ICG6$/-%\"y G6#\"\"!$!\"#!\"\"/--%\"DG6#F(F)F*" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 26 "sol:=dsolve(\{NE,IC\},y(t));" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%$solG/-%\"yG6#%\"tG,&*&*&%\"mG\"\"\"%\"gGF.\"\"\"%\"k G!\"\"!\"\"*&*&,&*&F-F0F/F0$\"\"&\"\"!F1$F3F:F.-%$cosG6#*&-%%sqrtG6#*& F1F0F-F2F0F)F.F.F0F1F2$\"+++++?!#5" }}}{EXCHG {PARA 0 "" 0 "" {TEXT -1 33 "To plot we specify the constants:" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 19 "g:=10; m:=1; k:=10;" }}{PARA 11 "" 1 "" {XPPMATH 20 " 6#>%\"gG\"#5" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%\"mG\"\"\"" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%\"kG\"#5" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 25 "Y_s:=unapply(rhs(sol),t):" }}}{EXCHG {PARA 0 "" 0 "" {TEXT -1 72 "We graph a stretch of 10 seconds together with the equili brium position:" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 3 "y1;" }} 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To graph a cartoon side view of the ma ss-spring system we need a sequence of straight-line segments. We pick a radius for the spring and the number of turns:" }}}{EXCHG {PARA 0 " > " 0 "" {MPLTEXT 1 0 15 "w:=0.2: nT:=10:" }}}{EXCHG {PARA 0 "" 0 "" {TEXT -1 145 "Given a position for the mass y(t) we divide this length into 2 nT segments, and generate a list of points which alternate on \+ the left and right." }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 37 "DL:= proc(t) local i,L,d; global w,nT;" }}{PARA 0 "> " 0 "" {MPLTEXT 1 0 50 "d:=evalf(Y_s(t)/(2*nT+1)); L:=[[0.,0.],[w,d*0.5]]:" }}{PARA 0 "> \+ " 0 "" {MPLTEXT 1 0 216 "for i from 1 to nT do: L:=[op(L),[-w,d*(2*i-0 .5)],[w,d*(2*i+0.5)]]; od: L:=[op(L),[0.,evalf(Y_s(t))],[w/4,evalf(Y_s (t))],[w/4,evalf(Y_s(t))-w/8],[-w/4,evalf(Y_s(t))-w/8],[-w/4,evalf(Y_s (t))],[0.,evalf(Y_s(t))]]; end:" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 36 "PL:=seq(plot(DL(j_t/10)),j_t=1..32):" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 39 "display(PL,insequence=true,axes=boxed);" }} {PARA 13 "" 1 "" {GLPLOT2D 159 512 512 {PLOTDATA 2 "6$-%(ANIMATEG6B7%- %'CURVESG6$7>7$\"\"!F,7$$\"1+++++++?!#;$!1+++5cP1d!#=7$$!1+++++++?F0$! 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Whenever the velocity gets appreciable, we want a force that reduces it. For positive velocity it has to be negative, f or negative velocity (downward) it has to be positive, i.e., we want a friction constant times the negative of the velocity added to the for ces:" }{TEXT 283 0 "" }{TEXT -1 0 "" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 31 "b:='b': m:='m': g:='g': k:='k':" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 53 "NE:=m*diff(y(t),t$2)=-m*g-k*(y(t)-y0)-b*diff( y(t),t);" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%#NEG/*&%\"mG\"\"\"-%%dif fG6$-%\"yG6#%\"tG-%\"$G6$F/\"\"#F(,(*&F'\"\"\"%\"gGF(!\"\"*&%\"kGF(F,F (F8*&%\"bGF(-F*6$F,F/F(F8" }}}{EXCHG {PARA 0 "" 0 "" {TEXT -1 594 "Usi ng mathematical jargon we can say that this is still a non-homogeneous (due to the constant gravity-related term), second-order ordinary dif ferential equation with constant coefficients. The method of solution \+ is still the same [find the general solution to the homogeneous proble m, (find and ) add a special solution to the inhomogeneous equation to the general homogeneous solution, and that is the general solution to the inhomogeneous problem with the boundary conditions still to be sp ecified]. Maple still can do all the math work for us so we concentrat e on understanding the physics:" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 21 "sol:=dsolve(NE,y(t));" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%$so lG/-%\"yG6#%\"tG,(*&*&%\"mG\"\"\"%\"gGF.\"\"\"%\"kG!\"\"!\"\"*&%$_C1GF .-%$expG6#,$*&*&,&%\"bGF.*$-%%sqrtG6#,&*$)F=\"\"#F0F.*&F-F0F1F.!\"%F0F .F.F)F.F0F-F2#F3FEF.F.*&%$_C2GF.-F76#,$*&*&,&F=F.F>F3F.F)F0F0F-F2FHF.F ." }}}{EXCHG {PARA 0 "" 0 "" {TEXT -1 278 "The solution is expressed i n a 'weird' way if we expect oscillatory answers, but keep in mind tha t the exponentials may turn out to have imaginary arguments. In fact, \+ the damped HO admits both oscillatory and non-oscillatory solutions (d epending on the strength of the damping)." }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 52 "Let us put in the same initial con ditions as before:" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 26 "sol:= dsolve(\{NE,IC\},y(t));" }}{PARA 12 "" 1 "" {XPPMATH 20 "6#>%$solG/-% \"yG6#%\"tG,(*&*&%\"mG\"\"\"%\"gGF.\"\"\"%\"kG!\"\"!\"\"*&*&,**(-%%sqr tG6#,&*$)%\"bG\"\"#F0F.*&F-F0F1F.$!\"%\"\"!F0F-F0F/F0$!\"&FC*(F>F.F-F0 F/F0$\"\"&FC*&F>F0F1F0$F3FC*&F8F0F1F0F.F.-%$expG6#,$*&*&,&F>F.*$-F96#, &FF.FSF3F.F)F0F0F-F2FWF.F0*&-F96#F;F0 F1\"\"\"F2$\"+++++5Fhn" }}}{EXCHG {PARA 0 "" 0 "" {TEXT -1 117 "Let us pick a small value for the damping coefficient in addition to the pre viously chosen parameters [the units for " }{TEXT 284 1 "b" }{TEXT -1 8 ": Ns/m]:" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 27 "g:=10; m:=1; k:=10; b:=1/5;" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%\"gG\"#5" }} {PARA 11 "" 1 "" {XPPMATH 20 "6#>%\"mG\"\"\"" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%\"kG\"#5" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%\"bG#\" \"\"\"\"&" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 25 "Y_s:=unapply(r hs(sol),t):" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 26 "plot([Y_s(t) ,y1],t=0..20);" }}{PARA 13 "" 1 "" {GLPLOT2D 692 299 299 {PLOTDATA 2 " 6&-%'CURVESG6$7e[l7$\"\"!$!+)*******>!#57$$\"+4x&)*3\"F+$!+s*QqY#F+7$$ \"+]9QF+$!+k@kAqF+7$$\"+M3VfVF+$!+MA'QH)F+7$$\"+<0dL[F+$!+9#)*4V *F+7$$\"+*>5xI&F+$!+G4,d5!\"*7$$\"+#))\\=y&F+$!+QPdo6FT7$$\"+j&*)fD'F+ $!+5*=`F\"FT7$$\"+Y#H,t'F+$!+5!3\\P\"FT7$$\"+G*oU?(F+$!+#[%=l9FT7$$\"+ 5'3%ywF+$!++,AW:FT7$$\"+#H[D:)F+$!+ueN5;FT7$$\"+azw&o)F+$!+%yZwm\"FT7$ $\"+;w)*=#*F+$!+OZ\\0I`[F+7$$\"+N[\\J=FT$!+1iXOUF+7$$\"+W^\"\\)=FT$!+MvP*y$F+7$$\"+`aL Q>FT$!+U@#H_$F+7$$\"+idv\"*>FT$!+%)frUMF+7$$\"+rg#FT$!+g;V8[F+7$$ \"+u(yrC#FT$!+k\"3/\\&F+7$$\"+Qiq'H#FT$!+=+cqiF+7$$\"+.PBYBFT$!+en'Q8( F+7$$\"+n6w&R#FT$!+Y'z%e!)F+7$$\"+K')GXCFT$!+U?F@!*F+7$$\"+'4;[\\#FT$! 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In fact, one is not interested in the kind of motion displayed above, but would rather want to absorb the oscillato ry energy in one-two swings. From the analytic form of the solution in the case with unspecified constants we can see when a character chang e occurs in the solution. This character change occurs as " }{TEXT 295 1 "b" }{TEXT -1 4 "^2-4" }{TEXT 294 2 "km" }{TEXT -1 123 " turns z ero, and the exponential has no longer complex-valued arguments [we ad d a tiny number to avoid a zero denominator]:" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 46 "g:=10; m:=1; k:=10; b:=sqrt(4*k)+10^(-Digits);" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%\"gG\"#5" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%\"mG\"\"\"" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%\"kG \"#5" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%\"bG,&*$-%%sqrtG6#\"#5\"\"\" \"\"##\"\"\"\",+++++\"F." }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 25 "Y_s:=unapply(rhs(sol),t):" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 26 "plot([Y_s(t),y1],t=0..10);" }}{PARA 13 "" 1 "" {GLPLOT2D 692 299 299 {PLOTDATA 2 "6&-%'CURVESG6$7in7$\"\"!$!1:k6++++?!#;7$$\"1mmmT&)G\\ a!#<$!1MVV%>wf5#F+7$$\"1LLL3x&)*3\"F+$!14o#Q$>&)yBF+7$$\"1++]ilyM;F+$! 1F?/lU8jFF+7$$\"1nmm;arz@F+$!1%o\"[(\\;n@$F+7$$\"1L$e*)4bQl#F+$!1h_O_h 'Hk$F+7$$\"1++D\"y%*z7$F+$!1l(R\"QN-#3%F+7$$\"1m;ajW8-OF+$!1\\x:]$e?_% F+7$$\"1LL$e9ui2%F+$!1]n<9kGa\\F+7$$\"1n;H2Q\\4YF+$!1o7-UJ@BaF+7$$\"1+ +voMrU^F+$!1CP9Y>5oeF+7$$\"1L$3-8Lfn&F+$!1)**4p9A^G'F+7$$\"1nmm\"z_\"4 iF+$!1k4qV1@smF+7$$\"1nmmm6m#G(F+$!1:]s%oe'etF+7$$\"1ommT&phN)F+$!1!pE Ez`c#zF+7$$\"1,+v=ddC%*F+$!1h;^nX8$Q)F+7$$\"1LLe*=)H\\5!#:$!1-AZZ>!)[( )F+7$$\"1++v=JN[6Fep$!1U5e/o#*=!*F+7$$\"1nm\"z/3uC\"Fep$!15sHnCDM#*F+7 $$\"1++DJ$RDX\"Fep$!1HB%4-0sa*F+7$$\"1nm\"zR'ok;Fep$!1'G*Q4ftS(*F+7$$ \"1++D1J:w=Fep$!1!zGq?\")H&)*F+7$$\"1MLL3En$4#Fep$!1\"Rn&)po(=**F+7$$ \"1nm;/RE&G#Fep$!1qU$[\\c@&**F+7$$\"1+++D.&4]#Fep$!1+bl@h!Q(**F+7$$\"1 +++vB_Y2aFep$!0y,`d%******Fep7$$\"1nm;zXu9c Fep$!0Y`:3(******Fep7$$\"1+++]y))GeFep$!0;cPY)******Fep7$$\"1++]i_QQgF ep$!0Ii4=*******Fep7$$\"1,+D\"y%3TiFep$!0p$za&*******Fep7$$\"1++]P![hY 'Fep$!0m\"*Rx*******Fep7$$\"1LLL$Qx$omFep$!0W8s()*******Fep7$$\"1+++v. 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We choose a harmonic driving fo rce with small amplitude to drive the HO away from the equilibrium. A \+ circular frequency nu characterizes the driving force." }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 41 "b:='b': m:='m': g:='g': k:='k': nu: ='nu':" }}{PARA 0 "> " 0 "" {MPLTEXT 1 0 70 "NE:=m*diff(y(t),t$2)=-m*g -k*(y(t)-y0)-b*diff(y(t),t)+(1/10)*sin(nu*t);" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%#NEG/*&%\"mG\"\"\"-%%diffG6$-%\"yG6#%\"tG-%\"$G6$F/\" \"#F(,**&F'\"\"\"%\"gGF(!\"\"*&%\"kGF(F,F(F8*&%\"bGF(-F*6$F,F/F(F8-%$s inG6#*&%#nuGF(F/F(#F(\"#5" }}}{EXCHG {PARA 0 "" 0 "" {TEXT -1 66 "For \+ the undamped case the internal frequency of the oscillator is:" }}} {EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 17 "omega:=sqrt(k/m);" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%&omegaG*$-%%sqrtG6#*&%\"kG\"\"\"%\"mG!\"\" F+" }}}{EXCHG {PARA 0 "" 0 "" {TEXT -1 136 "We need to investigate wha t happens as nu is varied over a wide range, and particularly what hap pens as nu approaches omega (resonance)." }}{PARA 0 "" 0 "" {TEXT -1 101 "For a small amplitude of the driving force we can expect dramatic results only for nu close to omega." }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 27 "g:=10; m:=1; k:=10; b:=1/2;" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%\"gG\"#5" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%\"mG\" \"\"" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%\"kG\"#5" }}{PARA 11 "" 1 " " {XPPMATH 20 "6#>%\"bG#\"\"\"\"\"#" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 6 "omega;" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#*$-%%sqrtG6# \"#5\"\"\"" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 3 "y1;" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#!\"\"" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 8 "nu:=3.1;" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%#nuG$\"#J!\"\"" } }}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 41 "sol:=dsolve(\{NE,y(0)=y1,D (y)(0)=0\},y(t)):" }}}{EXCHG {PARA 0 "" 0 "" {TEXT -1 49 "The result i s long, and perhaps worth looking at." }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 25 "Y_s:=unapply(rhs(sol),t):" }}{PARA 0 "> " 0 "" {MPLTEXT 1 0 26 "plot([Y_s(t),y1],t=0..20);" }}{PARA 13 "" 1 "" {GLPLOT2D 691 299 299 {PLOTDATA 2 "6&-%'CURVESG6$7_al7$\"\"!$!0+hi**** *****!#:7$$\"1mmmT&)G\\a!#<$!1\\[i*><*****!#;7$$\"1LLL3x&)*3\"F2$!1ql3 DyM****F27$$\"1++]ilyM;F2$!1B,@ra%y***F27$$\"1nmm;arz@F2$!1*R)GP0.&*** F27$$\"1+++DJdpKF2$!1[(=vf1W)**F27$$\"1LLLL3VfVF2$!1XW(4p*\\m**F27$$\" 1****\\i&*)fD'F2$!1d/_\"e0?#**F27$$\"1nmm\"H[D:)F2$!1*))48R,u()*F27$$ \"1,]7`zw&o)F2$!1LtM%fj%o)*F27$$\"1MLe9w)*=#*F2$!1#fh&)RJA')*F27$$\"1n ;/ws?_(*F2$!1j*G(>'Q#f)*F27$$\"1++v$pU&G5F+$!1Y(35kN*f)*F27$$\"1n;/Em= N6F+$!1\"o\\TS]O()*F27$$\"1LLLe0$=C\"F+$!1C[fod`/**F27$$\"1LL$eR\"=\\8 F+$!1cnqB\"H<&**F27$$\"1LLLLA`c9F+$!1Rt(*)*G8,5F+7$$\"1ML$32$)Qc\"F+$! 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What remains \+ is the first term in the above expression whose time variation is just connected to the inhomogeneous term in the Newton equation, i.e., jus t to the periodic driving force." }}{PARA 0 "" 0 "" {TEXT -1 79 "Let u s assume that we are in the asymptotic regime, which is reached when e xp(-" }{TEXT 286 2 "bt" }{TEXT -1 2 "/2" }{TEXT 293 1 "m" }{TEXT -1 118 ") becomes negligible compared to the first term. We simply pick o ut the first term in the solution. For our choice of " }{TEXT 287 1 "b " }{TEXT -1 43 "=1/2 (a strong, but undercritical damping) " }{TEXT 288 1 "t" }{TEXT -1 148 "_a=20 should be appropriate. We can verify fr om a graph, that we have reached the limit cycle, i.e., driven harmoni c motion with constant amplitude." }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 30 "Y_as:=unapply(op(1,Y_s(t)),t);" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%%Y_asGR6#%\"tG6\"6$%)operatorG%&arrowGF(,$*&,0*&-%$si nG6#*&%#nuG\"\"\"9$F5F5)%\"kG\"\"#\"\"\"!\"\"**F4F:-%$cosGF2F5%\"bGF5F 8F5F5*()%\"mG\"\"$F:%\"gGF5)F4\"\"%F:\"#5*(FBF5FDF:F7F:FG**)FBF9F:FDF: )F4F9F:F8F:!#?**FBF:FDF:)F?F9F:FKF:FG**F0F:FKF:FBF:F8F:F5F:*&F8\"\"\", **&FEF:FJF:F5*&FNF:FKF:F5*(FBF:F8F:FKF:!\"#*$F7F:F5\"\"\"!\"\"#F;FGF(F (F(" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 118 "plot([subs(g=10,m=1 ,k=10,b=1/2,nu=31/10,Y_as(t)),subs(g=10,m=1,k=10,y1)+1/20*sin(31/10*t) ],t=20..40,color=[red,blue]);" }}{PARA 13 "" 1 "" {GLPLOT2D 694 299 299 {PLOTDATA 2 "6&-%'CURVESG6$7gbl7$$\"#?\"\"!$!1)f&>8(\\@0\"!#:7$$\" 1ML3x&)*3,#!#9$!1ia9)[f11\"F-7$$\"1nm;arz@?F1$!1yA%=!3Ji5F-7$$\"1++DJd pK?F1$!1ecg[p\"p0\"F-7$$\"1LLL3VfV?F1$!1/i6%y(3X5F-7$$\"1]i:0dL[?F1$!1 keu)z[#Q5F-7$$\"1n\"z>5xI0#F1$!1gaXp\\eI5F-7$$\"1%3-))\\=y0#F1$!1<=Wo: EA5F-7$$\"1+]i&*)fD1#F1$!1TQr\"4eM,\"F-7$$\"13C!o*F[o7$$\"1L e9w)*=#4#F1$!1#*41))*4hf*F[o7$$\"1;/ws?_(4#F1$!1HGEC(*)H_*F[o7$$\"1+]P pU&G5#F1$!1JC#>QtGY*F[o7$$\"1$e*)fY'=3@F1$!1vz$3\")*R<%*F[o7$$\"1nTgi' =N6#F1$!16**yz'3yQ*F[o7$$\"1e9\"4w%=;@F1$!1Q#3!>(Q#z$*F[o7$$\"1](=#f3& )=@F1$!1]_b\"o1\\P*F[o7$$\"1Ug_dp^@@F1$!1yL:U@%[P*F[o7$$\"1LL$e0$=C@F1 $!1u;TTb/z$*F[o7$$\"1LLeR\"=\\8#F1$!1>!Q.&[8Q%*F[o7$$\"1LLLBKlX@F1$!1! 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The phase shift is achieved by the combination of sines and cosines present in the solution." }}}{EXCHG {PARA 0 "" 0 "" {TEXT -1 128 "Our interest is in extracting the amplit ude as a function of the parameters. First we have to subtract the equ ilibrium position:" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 16 "assum e(nu,real);" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 28 "A:=combine(Y _as(t)-y1,trig);" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%\"AG*&,(*&-%$sin G6#*&%$nu|irG\"\"\"%\"tGF-F-%\"kGF-F-*(F,\"\"\"-%$cosGF*F-%\"bGF-!\"\" *(F(F1)F,\"\"#F1%\"mGF-F5F1,**&)F,\"\"%F1)F9F8F1\"#5*&)F4F8F1F7F1F?*(F 9F1F/F1F7F1!#?*$)F/F8F1F?!\"\"" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 26 "A0:=simplify(subs(b=0,A));" }}{PARA 11 "" 1 "" {XPPMATH 20 "6# >%#A0G,$*&-%$sinG6#*&%$nu|irG\"\"\"%\"tGF,\"\"\",&%\"kG!\"\"*&%\"mGF,) F+\"\"#F.F,!\"\"#F1\"#5" }}}{EXCHG {PARA 0 "" 0 "" {TEXT -1 108 "We no te that in the case without friction the asymptotic amplitude blows up on resonance [note that omega^2=" }{TEXT 292 1 "k" }{TEXT -1 1 "/" } {TEXT 291 1 "m" }{TEXT -1 231 "]. This means that no limit cycle is re ached, but that the amplitude grows linearly with time [the latter det ail is obtained from an analysis of the solution to Newton's equation, we leave it as an exercise to extract this result]." }}{PARA 0 "" 0 " " {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 295 "For the case with fric tion the resonance occurs at a shifted frequency, and the mentioned ph ase shift occurs. Let us look first at the asymptotic solution when nu is chosen to be on resonance in the frictionless (undamped HO) case. This answer should be reasonable for small friction constants " } {TEXT 296 1 "b" }{TEXT -1 1 "." }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 34 "simplify(algsubs(nu=sqrt(k/m),A));" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#,$*&*(-%$cosG6#*&-%%sqrtG6#*&%\"kG\"\"\"%\"mG!\"\"F/%\" tG\"\"\"F3F*F/F0F3F/*&%\"bG\"\"\"F.\"\"\"F1#!\"\"\"#5" }}}{EXCHG {PARA 0 "" 0 "" {TEXT -1 172 "So let us assume that near resonance the amplitude is given by looking just at the cosine term (as the two sin e terms nearly cancel on resonance in the weakly damped case)." }}} {EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 38 "A1:=simplify(nu*b*cos(nu*t)/ denom(A));" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%#A1G,$*&*(%$nu|irG\"\" \"%\"bG\"\"\"-%$cosG6#*&F(F+%\"tGF+F+F),**&)F(\"\"%F))%\"mG\"\"#F)F+*& )F*F7F))F(F7F)F+*(F6F+%\"kGF+F:F)!\"#*$)F " 0 "" {MPLTEXT 1 0 29 "A1a:=simplify(nu*b/denom(A));" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%$A1aG,$*&*&%$nu|irG\"\"\"%\"bGF)\"\"\",**&)F(\"\"%F+) %\"mG\"\"#F+F)*&)F*F2F+)F(F2F+F)*(F1F)%\"kGF)F5F+!\"#*$)F7F2F+F)!\"\"# F)\"#5" }}}{EXCHG {PARA 0 "" 0 "" {TEXT -1 15 "Now we specify " } {TEXT 298 1 "k" }{TEXT -1 5 " and " }{TEXT 297 1 "m" }{TEXT -1 39 ", w ith the resonance at omega=sqrt(10)." }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 25 "A1as:=subs(m=1,k=10,A1a);" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%%A1asG,$*&*&%$nu|irG\"\"\"%\"bGF)\"\"\",**$)F(\"\"%F+ F)*&)F*\"\"#F+)F(F2F+F)*$F3F+!#?\"$+\"F)!\"\"#F)\"#5" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 44 "P0:=plot([sqrt(10),t,t=0..1.5],color=blac k):" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 47 "P1:=plot(subs(b=1/5, A1as),nu=3..3.3,color=red):" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 49 "P2:=plot(subs(b=1/15,A1as),nu=3..3.3,color=blue):" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 50 "P3:=plot(subs(b=1/45,A1as),nu=3..3. 3,color=green):" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 61 "display( P0,P1,P2,P3,axes=boxed,labels=[frequency,Amplitude]);" }}{PARA 13 "" 1 "" {GLPLOT2D 695 299 299 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$Facl$\"1?5>!o)Rb>F/7$Ffcl$\"1vLe[WB?*Fgem-Fit6&F[uF+FjelF+-%+AXESLABELSG6$%*freque ncyG%*AmplitudeG-%*AXESSTYLEG6#%$BOXG-%%VIEWG6$;F`u$\"#L!\"\"%(DEFAULT G" 1 2 0 1 0 2 9 1 2 2 1.000000 45.000000 45.000000 0 }}}}{EXCHG {PARA 0 "" 0 "" {TEXT -1 122 "The graph shows that the damped oscillat or is capable of absorbing energy from the driving mechanism in the fo llowing way:" }}{PARA 0 "" 0 "" {TEXT -1 229 "1) very weak damping: th e oscillator can only absorb energy effectively if the mechanical ener gy is offered at a frequencies close to the natural frequency, which i s very close to the natural frequency of the undamped oscillator;" }} {PARA 0 "" 0 "" {TEXT -1 205 "2) for moderate damping the range over w hich energy can be absorbed broadens somewhat; the resonance condition is shifted slightly towards lower frequencies when compared to the un damped natural frequency." }}{PARA 0 "" 0 "" {TEXT -1 329 "3) for stro nger damping the resonance is broadened: the harmonic oscillator is ab le to absorb frequencies over a wider range equally, but the amplitude of oscillation is reduced considerably. This is the result of the dri ving force not being able to be in phase with the internal oscillatory motion even in the asymptotic regime." }}{PARA 0 "" 0 "" {TEXT -1 0 " " }}{PARA 0 "" 0 "" {TEXT -1 84 "For a more detailed analysis the read er may wish to consult the book by Ron Greene: " }{TEXT 299 30 "Classi cal Mechanics with Maple" }{TEXT -1 20 " (Springer-Verlag). " }}} {EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 0 "" }}}}{MARK "71 1 0" 0 } {VIEWOPTS 1 1 0 1 1 1803 }