Certain methods for construction of asymptotics for the Hill equations

On the basis of a method considered by A. Nayfeh we find an asymptotic solution of a special form for the Hill equation in a neighborhood of transition curves. Then, by the averaging method and by means of the corrections obtained up to fourth order we study the same differential equation. We show t...

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Дата:1992
Автори: Shishanin, O. E., Шишанин, О. Е.
Формат: Стаття
Мова:Російська
Опубліковано: Institute of Mathematics, NAS of Ukraine 1992
Онлайн доступ:https://umj.imath.kiev.ua/index.php/umj/article/view/7807
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Назва журналу:Ukrains’kyi Matematychnyi Zhurnal
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Ukrains’kyi Matematychnyi Zhurnal
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author Shishanin, O. E.
Шишанин, О. Е.
author_facet Shishanin, O. E.
Шишанин, О. Е.
author_sort Shishanin, O. E.
baseUrl_str https://umj.imath.kiev.ua/index.php/umj/oai
collection OJS
datestamp_date 2023-09-14T12:03:56Z
description On the basis of a method considered by A. Nayfeh we find an asymptotic solution of a special form for the Hill equation in a neighborhood of transition curves. Then, by the averaging method and by means of the corrections obtained up to fourth order we study the same differential equation. We show that the second method also leads to the asymptotics obtained.
first_indexed 2026-03-24T03:34:02Z
format Article
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H aAcpe, 3 Ha li,'(eJ-IO aCHMIJTOT H'IHH ii p 03B 0 5!30K OK p e ~!OfO piBH51HIHI Xi.JJJia B OKO,l i nepexi,QHHX KpHBHX. rloTiM '1CTO,'.!OM ycepe.~HCHIIH 33 !lOllOMOr()JO O.!lep ­ }KalrnX nonpaBOK .lO qeTBepTOf O n op511lKY n.oc.1JiJl)l(Y€1bC51 Te }K /lHcpepeHuia.!J b He piBI-IH li HH . no­ Ka 3a Ho, mo i Ltp yrHfl cnoci6 n pHBOJIHTb 110 3 Haii11e 11 o"i acttMIITOTJ-IKJ-1 . B nocJie)lHee BpeMH }laIIHblH Bonpoc paCCl\1aTpHBa .1JCH, B l! 3CTHOCTH, B pa6oTaX [l, 2]. K ypaB11e1-nno XttJI.11a, KpoMe Toro , np1rnonwr , Hanp 11Mep, 3a}latm LJ.BiDKe­ HH51 3a pH.>KeHHbIX 4 3CTIIU B nepHOLJ.Hl!eCKHX M3fHHTllbIX no.irnx [3]. PaccMOTpHM 06bIKHOBe 1moe nmp::pepeHUH3.1IbHOe y p aB He1rne BH)la {l } r ,11.e nepHOJlli'I eCKaH cpy1-IK UHH g ('r) npe)lCTaBHMa KOHelJHOH cyMMOH g ('r) = a ± ~ sin (2k + 1) •. (2) k=O + 3 ,11.ecb a0 , a E IR1, e « I, -r E [0, 2nl. no TeopeMe <l>,'IOKe ypaBHemrn MaThe 11.1111 Xrr.11.11a 06.11a,1J.a10T JlBYMH He3aBH· CHMbIMH l[3CTI-lb!MH peweHHHMH l4] BHJla x1 = exp (iyr) • cp (1:) , x 2 = exp (- i)'T) • cp (- 1:), rJl,e cpyHKUHH cp (1:) nepHOLl.WieCKaH c nepHOJlOM 2n, npl-llJeM Jl.1I H YCTO lll!HBOl'O JlBH.>KeHHH Heo6xonmm, l!T06bI Im '\' = 0 . Hatt60.1IbillHe TPY .'lllOCTH Bbl3b!B3JOT ITOHCKH tjlyI-IKUHH cp (1:). 6y .ueM Cl!l-fT3Tb M a.r1b1M napaMeTpoM BeJmLJHH Y e. I-lama ue.11b - o npene;1e1me cp (1:) H LJaCTOTbI 1' c mo6oi-i: CTeneHb!O TOLIIIOCTH . T e o p e M a. llpu6J1 uJ1ceHHbte peu.teHufl, HailcJeH!-ll,te Ollfl ypaeHel-lUfl (1) Ha ocHoee npOl{ecJypbt, npecJJ10J1ceHHOil Haile/HJ , u ,1temoaa ycpecJHeHUfl, eo ecex nopflcJIWX npueoamn K OOU!-la!WBOMY pe3yllbtnamy . .[l.1151 1lOKa3aTe.1lbCTBa -reopeMbl B H3lia.1Je H3,'IO)KHM Bbll!HC.1II1Te.1Ibl-IYIO cxeMy nocrpoeHH H npH6.1JH)KeHHH COOTBeTCTBYIOUJ.P.fO nopH.llKa no o6eHM npou eJlypaM. flyCTb fIOKa a0 °= 0. ripe)KJle Bcero paCCMOTpHM TaK Ha3bIBaeMb! H MeTO.ll YHTTeKepa, onHca1-1- Hblll B MOHOrpacjmH [2]. 4 acTHoe pewe1-rne Jl.TIH (1) 6y,ueM HCKaTb B BH.Ue x = exp (i)'T) • cp (1:), me <p (-r) = cp (T + 2n). H a r paHHUe ycTOHlJHBOCTH '\' = 0 (H.1IH y = 1) . .Um, cp (-r) no.11yq11111 ypaBHe1-me d2 cp!d1:2 + 2ivdrp/d-i: - '\'2cp + e-2g (-r) , cp = 0. (4) TTpeJlCTaBHM <p (-v) H y B BH}le nO.TIH HOMOB l!eTBepTOro nopHJJ.Ka no e: 4 4 cp ('t') = % (1:) + ~ ehp,, (1:), v = ~ ,.- ·•v,,. Li ....., k=I ~-1 (K MOTHB3UHH BbI6op a nop5IJlKa no.1111 1-IoMa BepHeMCH 1-IH,Ke .) noncTaB.11 5151 <p ('t') H y B (4) H npHpaB I-H!BaH l{03CpcpH UHeHTbl npH omrnaKOBb!X CTeneHHX e, no.11y ­ q aeM uenol!KY ypaBI-Ie1-rnti . ' rp2 = - 2 i'\'2% - 2iy1 (j)1 + Y/% - g ('v) % , C 0 . B, WHWAHHH, !992 142 ISSN 0041-6053. Ytcp. MaT. :NCypH., 1992. T. 44, M I if • • ' % = - 2iYaCflo - 2iY1cr2 - 2iy2cr1 + y~cp1 + 2Y11'2% - g ('r) <r1, .. . . . . cr~ = - 2iy4cro - 2iv1cr3 - 2iy2cP2 - 2i'),3cp1 + '\'~cr2 + + %Y~ + 21'11'2CP1 + 21'11'3% - g (T) CP2· Pema.H nocJie,noBaTeJibHO 3TH ypaBI-remrn B COOTBeTCTBHH C MeTO,llHKOH, npHMe­ HeHHOH B (2, 5] (6e3 ceKyJrnpHblX 4JJeI-IOB), MOrKHO HaHTH cp (T), a 3aTeM nocTpo­ HTb o6w.ee pewe1rne , COrJJaCI-10 (3), C TQLJI-lOCTblO no e4 B 11.eHCTBHTeJibHOH cjJOpMe (5) 11.ne n k=O Tl + f'. ~ 2 [F n (T)- L (2/? ~ l)6 COS 2 (2/? + 1) T], k=O n 1 <D2 ('t) = - 2e3av ~ (2k + !)4 cos (2k + 1) T, k=U n n ,., 1 '\-, 1 [ 1 F n (<t) = L..J 2k + 1 1- (2v + 1)3 (/~ - v)2 cos 2 (k - v) 11- k=o v=O - (k +: + 1)2 cos 2 (k + V + 1) T]' A tt '\j) - npoH3BOJibHbie nocTO.HHHb1e, v = :n:2ea / 8-V3. TTptt 3TOM 6ww HaH­ ,neHo, 4TO y1 = y3 = 0, '\'~ = n'•a~ I 192. {13 cj.iopMbl perueHH .H (5) , a TaKrKe cjJyHKUHH CJ)l (i'), (1)2 (T) Jlefl(O BtUJeTb, 41'0 orpaHH4eHHe IlOJJHHOMOB 1l.JI.H cp (T) 11 y, 1-1anpmv1ep, BTOpOH CTeneHblO np11- Be,neT I( HC4e31-!0Be HHJO <!) 2 (T). &ro o6CTO.HTeJibCTBO He rapa t-rrnpyeT 06u.u-10CTH pa 3JJ0)l(Nl115l (5). Ta1mM o6pa30M, B35!Tble nomUJOMbl 4eTBepTOH CTenemt o npe- 11.eJl5l lOT MHl-!HMaJJbHblH nop HllOK, np11 KOTOpOM fl051BJJ51 eTC5J 001.IlclH CTpyJ<'rypa peweHH51 (5). EcJJH creneI-lb f! OJlll!-iOM3 no C 8 1.,Jll!e qeTBepToro nop5lnKa, TO 3TO He np1-rne11.eT K H3MeHeHHIO BHD.a cjiopMyJibl (5), cl Bb!pa 3 HTC51 JIHWb B l l051 BJieHHH 6oJiee M3JlblX nonpaBOK K cjJyHKUHHM (lJ, (T), (1) 2 ('r). Ecm1 cjJyHKUH51 g (T) npe)l.CTaBJI5JeTC51 B BHne pHD.a, TO CD; ('r) , i = l, 2, 6y 1l.YT HMeTh B11,u <JJi(q;) = 1 - ; 0 g 2aE2 (:) + 3;:0 e~a2E 5 (2;) + ~4 a2 F <» (-r:), (6) 3,necb En (z) - MHOrotJJJel-!bl 3iiJiepa. EcJIH ,B 3 .HTb nonpaBKH 6oJiee Bb!COKoro nopH.UKa, BilJIOTb ,no e", TO IlOJIY4HM )'4 = 'i's = 0, '\'o = :n:8a3/l 0080 · Vr3. .[laJiee ttcnoJJh3yeM MeTo.U 5oromo6oBa - MttTponoJihCKoro. CJie.UyH pac­ cMaTpttBaeMoii TeopHH ycpe,nHeHJrn [5], ypaBHeHHe (1) npe,nCTal3HM B CTaH1l.3 pT­ HOH cjiopMe dXldT = eGX, (7) r.n.e ISSN 0041 -6053. YKp. ~1ar. [J/CypH., 1992, T. 44, M I 143 Bttat:iaJie JIJIH BeKTopa X B03hMeM ooJI.ee o6mee MaTpnq1we y paBHe1rne dX/d;; = eY (-r, X). KaK tt3Becrno , ,11.JIH cpyHKU:HH Y (.:, X) o npe;J.eJrneTcH orrepaum1 ycpe,11.tteHHSI (Y (-r, X)) = lim t {y (-r, X) d-r T➔ oo 0 (8) H BB0JIHTCH HHTerp11py1omttii orrepaTOp y (.:, ;) = s [Y (-r , s)- (Y (T, s))l d'TJ. BeKTOp I; H3X0.ll.HTC51 H3 CHCTeMhl ITepBoe rrptt6Jitt)KeHHe onpe,neJJHeTcH KaK X {.:) = s (<t) + eY (T, ;). B [3] 6JJH3KaH aa.nat:ia 6b1J1a paccMoTpeHa c yqeT0M BToporo np116JJ1-1>KeHHH. O.nttaKO l!TepallH0HHhIM MeT0.l].0M, II0CJle.ll.0BaTeJJhH0 nptt6aBJJ5151 0 llepeJIHYI0 nonpaBKY ' M0)KH0 II0JJyqHTh Jll06oe npH6JJH>Kem1e. B 'l3CTH0CTH, Il0JJyqeH0 X (.:) = s + L eiY ;, (9) {=1 r .ne ' :! = e (Y) + }>;+ 1 ( ~~ Y;), C orJJaCHO (5], norpernH0CTh Il3HH0ro npH0JIH)KeHH51 6y,ne1J 86 • B €QOT,BeTCTBHH c (7) rroJJo)lrnM Tenepb Y (.:, X) = GX. r.ll,e 144 Tor.na tt3 (9) Hafi.neM 4 X (~) = (1 + L e'G;) 1;, 1=1 4 ~ld-c = e (G (1 + l: e;G1 )) 1;. l=I MaTpHU6I a, HMeIOT BH,ll G1 = G, G2 = GG, -G1 (G), G3 = GG2 - 0 1 (GG1 ) - G2 (G), 0~ = GG3 - G1 (GG2) - c\ (GG1) - G3 (G). (10) (11) ISSN 0041-6053. YKP. Mar. ~ypH., 1992, T . .f4, M I 0134 0135 0136
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spelling umjimathkievua-article-78072023-09-14T12:03:56Z Certain methods for construction of asymptotics for the Hill equations Некоторые способы построения асимптотик для уравнения Хилла Shishanin, O. E. Шишанин, О. Е. On the basis of a method considered by A. Nayfeh we find an asymptotic solution of a special form for the Hill equation in a neighborhood of transition curves. Then, by the averaging method and by means of the corrections obtained up to fourth order we study the same differential equation. We show that the second method also leads to the asymptotics obtained. На основании метода, рассмотренного А. Найфэ, найдено асимптотическое решение частного вида уравнения Хилла в окрестности переходных кривых. Затем методом усреднения с помощью полученных поправок до четвертого порядка исследуется то же дифференциальное уравнение. Показано, что и второй способ приводит к найденной асимптотике. За допомогою методу, розглянутого А. Найфе, знайдено асимптотичний розв’язок окремого рівняння Хілла в околі перехідних кривих. Потім методом усереднення за допомогою одержаних поправок до четвертого порядку досліджується те ж диференціальне рівняння. Показано, що і другий спосіб приводить до знайденої асимптотики. Institute of Mathematics, NAS of Ukraine 1992-02-04 Article Article application/pdf https://umj.imath.kiev.ua/index.php/umj/article/view/7807 Ukrains’kyi Matematychnyi Zhurnal; Vol. 44 No. 1 (1992); 142-145 Український математичний журнал; Том 44 № 1 (1992); 142-145 1027-3190 rus https://umj.imath.kiev.ua/index.php/umj/article/view/7807/9474 Copyright (c) 1992 O. E. Shishanin
spellingShingle Shishanin, O. E.
Шишанин, О. Е.
Certain methods for construction of asymptotics for the Hill equations
title Certain methods for construction of asymptotics for the Hill equations
title_alt Некоторые способы построения асимптотик для уравнения Хилла
title_full Certain methods for construction of asymptotics for the Hill equations
title_fullStr Certain methods for construction of asymptotics for the Hill equations
title_full_unstemmed Certain methods for construction of asymptotics for the Hill equations
title_short Certain methods for construction of asymptotics for the Hill equations
title_sort certain methods for construction of asymptotics for the hill equations
url https://umj.imath.kiev.ua/index.php/umj/article/view/7807
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