摘要
建立了同时考虑振动和钻进运动，且能够将高频低幅激励转化为低频高幅响应的冲击钻进机械振动系统的力学模型。分析了系统的部件在碰撞后呈现“同步”和“非同步”运动的条件。使用了一种非对称的拍频运动激励，即只用调制波正值部分激励质块 。结果表明该激励能够产生有效的冲击力，即锤击效应。给出了两种在无附加控制条件下系统能够获得稳定钻进运动的途径，但在这两种情况下，钻进量相对比较低，因此，采用了一种能够提高钻进量的简单控制策略，获得了比较好的钻进效果。
Abstract
A mathematical model of impact-progressive mechanical system accouting for vibration and progressive motion, and capable of transferring a high-frequency low-amplitude excitation into low-frequency high-amplitude response is developed. Condition for synchronous and non-synchronous motions of impact components immediately after the impact is studied. A asymmetric beat frequency kinematic excitation is used, i.e.only positive part of the modulated signal excites the mass . The results indicate that an effective impact forces, i.e.hammer effect is generated by the excitation. Two different ways to achieve a steady progression are explored without additional control, however, in these two cases progression rates are relatively low. A simple control strategy enhancing progression rates is implemented, and better progression rates are achieved.
关键词
非光滑系统 /
振动 /
冲击 /
拍频激励
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Key words
non-smooth system /
vibration /
impact /
beat frequency excitation
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吕小红;罗冠炜.
拍频激励下冲击钻进系统的运动分析[J]. 振动与冲击, 2012, 31(24): 1-4
L Xiao-hong LUO Guan-wei.
Kinematic analysis of impact-progressive system by beat frequency excitation[J]. Journal of Vibration and Shock, 2012, 31(24): 1-4
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