CH18 - 动动动动动动动动动动动 CAI 动动...

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Unformatted text preview: 动动动动动动动动动动动 CAI 动动 动动动动动动动动动 §18-1 动动 §18-2 动动动动动动动动动动动 §18-3 动动动动动动动动动 §18-4 动动动动动动动动动动动 动动动动动动动动动动动 §18-5 §18-6 动动动动动 §18-1 动动 C C A A B B K K K K 1 1 2 2 1 l 2 l x x θ θ ) cos( ) ( ), cos( ) ( ϕ ϖ θ ϕ ϖ - =- = t t t X t x θ θ 动动动动动动动动 动动动动动动动动 P450 动动动动动动动动动 D---- 动动动动动 D n 动动动动 G---- 动动动动 2 / 80 m GN G = 动动动动 d 动动动动 动动动动动 n D Gd k 3 4 8 = x O x S δ 动动动动动动 m 动动动动 动动动动 k 动动动动动动动 =- s k mg δ §18-2 动动动动动动动动动动动 kx x k mg x m s- = +- = ) ( δ 2 = + x x n ϖ 动动动动动动动动 动动动动动动 O 动动动动动动动 动动 O-x 动 动动动动动动动动动动动动动 动 m k n = ϖ 动动 动动动动 动 动动动动动动动动动动动动动 2 = + x x n ϖ 动动动动动动 ) ( , ) ( , υ = = = x x x t 动动动动动动 t c t c x n n ϖ ϖ sin cos 2 1 + = 1 1 cos c c x = = t c t c x n n n n ϖ ϖ ϖ ϖ cos sin 2 1 +- = 动 n n c c ϖ ϖ υ 2 2 cos = = 动 动动动 ) sin( ) ( α ϖ + = t A t x n t t x t x n n n ϖ ϖ υ ϖ sin cos ) ( + = 动 υ ϖ α x a r c tg n = 动动 动动动 k m T n π ϖ π 2 2 = = 动动 动动 动动动动动动动动动动动动动动动动动 n x A 2 2 2 ϖ υ + = 动动 动动 动动 m k n = ϖ 动动 动动动动 动 动动动动动动动动动 t x o A α sin A x = T 676 . 7 450 26519 = = = m k n ϖ 818 . 676 . 7 2 2 = = = π ϖ π n T 动 m N k kg m / 26519 , 450 = = 动 动动动动动 m=1kg 动动动动动 h=0.1 m 动动动动动动动动动动动动动动动动动动 动动动 k=4900N/m 动动动动动动动动动动动 动动动动动动动动动动动动 k h m k n = ϖ 动动动动 70 1 4900 = = S 1 动动动动动动动动动动动动动动动动动 s cm gh x o / 140 10 980 2 2 ; ) ( = × × = = = υ cm x A n o n o o 2 70 140 2 2 2 = = = + = ϖ υ ϖ υ 动动 动动 动动动动动动动动 O 动动动动动动动 动 O---x 动 x O k h 动动动动动 ) sin( ) ( α ϖ + = t A t x n 动动动动动动动动动动动动动动 t 70 sin 2 = cm 140 = = = o o n x tg υ ϖ α , = α 动 动 18-4 动动 Q 动动动动动动动动动动动动 动动 AB 动动动动动动动动动动动动动动动动 Q 动动动动动动动动动动 mm s 2 = δ 动动动 动动动动动动动动动动动 = t 动动 O x 动动动动 O 动动动动 动动动动动 O-x 动 mm s 2 = δ 动动动动动 O 动动动 , 动动动动动 O-x 动 动动 动 = t 动动 , 2 =- = υ...
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CH18 - 动动动动动动动动动动动 CAI 动动...

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