拍频激励下冲击钻进系统的运动分析

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A mechanical model of an impact-progressive system considering both vibration and progressive motion and capable of transferring a high-frequency low-amplitude excitation into a low-frequency high-amplitude response was developed. Conditions for synchronous and non-synchronous motions of the system components after impact were analyzed. An asymmetric beat frequency kinematic excitation was adopted, i.e. , only the positive part of a modulated signal excited the mass M2. The results indicated that an effective impact forces, i. e. , a hammer effect is generated by the excitation; two different ways to achieve a steady progression are given without additional control conditions, however, in these two cases the progression rates are relatively low; a simple control strategy enhancing the progression rates is implemented, and the better progression rates are achieved.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M2。结果表明该激励能够产生有效的冲击力，即锤击效应。给出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。