《机械振动与噪声学》习题集与答案

?x1??1?F0?i?t? 4－21 ??????ReZ????e??x0???2???2???k2?ic2? Z??k1?k2?m1??i(c1?c2)?? 2?k2?ic2?k2?k3?m2??i(c2?c3)?????5－2 ??0.1, ?d?19.9rad/s, ??0.63,

xnxn?1?1.88

5－4??0.0202,??0.003215, ?d?44.72rad/s c?1.44Ns/m

5－5 0.58mm, FT?506.4N

5－7 3.166 cm/s

5－9 (a) n < 20.7 rpm；(b) n = 37.6 rpm 5－10 2 . 68 mm

5－12 k2?5?107N/m

?1?35.79rad/s;?22

?73.51rad/s

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