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Vi~c tang tOe d9 lim vi~c vi giim khOi lm;mg ella d.c rniy dOi hOi phii quan tim t6i t:inh chilt dan h~i cic khiu c-da ca cilu trong may. Vi~c nghi€n cU·u dao d9ng uOn ella khiu nOi trong CO' cau bOn khau da drrqc de c~p de'n trong m9t sO c&ng trlnh nghi€h ciTu, chlng h~n trong [1, 2, 3, 4]. Trong d6, khi thie't l~p phxrOTig trlnh dao d(?ng thrrCmg drra ra m9t s5 gi.i thigt dcm giin han. Khi giii, ngrrOi. ta ho9.c chl tim drrqc nghi~m b~ng phrrong phip sO trc·ng giai do~n m& miy, ho~c tlm nghi~m tu'an ho~m m9t cich kh:i thO b~ng chu6i hr<!llg gLic. Trong cOng trlnh nay1 ip d~J.ng k:Y thu~t tich c:iu trUe, drra ra m9t phuang phip t~ng quit d~ thie't l~p phmmg trlnh dao dQng u5n ella m<?t ca ciu bat kY trong cO" ciu nhi'eu khiu. Sao d6 trlnh bay vi~c tlnh toan b~ng s& xac dinh dao d9ng uOn tukn hoin clia thanh truy'en trong CCY ca:u bOn khiu.

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