... h6i cho mo hlnh bai roan dan-deo hai chi~u: Ong trlJ dai, co bankinh trong r=lOOmm, ban kinh ngoai R =200mm, ch~u ap Ilfc d~uxuyen tam tU bell trong hlnh trlJ, xet bai roan trong tr<;tngthai ... X':lqui h6i cho cac lo':li bai roan bien sail:Bai roan dan -nhot-deo hai chi~u. Bai roan dan-nhOt hai chi~u, ba chi~u. Bai roan dao dQng hai chi~u trong v~t th6 dn bien d':lng phi ... trung boa: rj(a-,a) = 0 ne'uf(a,a) = oe Bai roan bien tq ban dftu (bai roan BTBD): D?ng vi phan cua bai roanBTBD mQtchi~u: pv; - cr~- Pb = 0 trong Bx]0,T[, di~u ki~n bien:u = Ii trenauB...