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xyz,, uvw,, Bernoulli-Euler u c c c v, w θ x c c c dv ( x) dw uxyz (,, ) = u( x) y z + ω( yz, ) φ dx dx c vxyz (,, ) = v( x) zθ x ( x) c wxyz (,, ) =
5. 5.1,, V, ,, ( 5.1), 5.2.2,,,,,,,,,, 5.2.3, 5.2 L1, L2, L3 3-1, 2-2, 1-3,,, L1, L3, L2, ,,, ( 5.3),,, N 3 L 2 S L 1 L 3 5.1: 5.2: 1
r d 2r d l d (a) (b) (c) 1: I(x,t) I(x+ x,t) I(0,t) I(l,t) V in V(x,t) V(x+ x,t) V(0,t) l V(l,t) 2: 0 x x+ x 3: V in 3 V in x V (x, t) I(x, t
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