② 活塞在缸体中的往复运动可以看作是一个对中问题,当活塞与缸体的间隙增大,或者曲轴连杆与活塞连接部位传力不佳,都会产生活塞在缸体中运动不走直线,而活塞一旦不走直线就会对缸体产生一个横向撞击,使振动增加,一级缸缸端水平、垂直方向的振动值上升说明这个问题。③ 一级缸三个方向的振动加速度虽然降低,但高频部分能量向低频部分转移,而且基础振动(也是低频振动)上升,说明故障已进入中、后期。
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