拍频激励下的冲击钻进机械系统动力学特性研究

中国机械工程 ›› 2012, Vol. 23 ›› Issue (6): 708-712.

拍频激励下的冲击钻进机械系统动力学特性研究

苟向锋;吕小红

兰州交通大学,兰州,730070

出版日期:2012-03-26 发布日期:2012-04-13
基金资助:
国家自然科学基金资助项目(11172119, 10972095）
National Natural Science Foundation of China（No. 11172119, 10972095）

Research on Dynamics of an Impact-progressive Mechanical System by Beat Frequency Excitation

Gou Xiangfeng;Lü Xiaohong

Lanzhou Jiaotong University,Lanzhou,730070

Online:2012-03-26 Published:2012-04-13
Supported by:
National Natural Science Foundation of China（No. 11172119, 10972095）

摘要/Abstract

摘要：

考虑系统的振动和钻进运动,建立了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系统的力学模型。分析了系统部件在碰撞以后出现“同步”和“非同步”运动的条件。
采用了具有低频调制激励与振动系统固有频率（所期望的低频）吻合以及只用调制波正值部分激励质量块M2这两种特征的拍频运动激励,结果表明,该激励能够产生有效的冲击力,即锤击效应。给出了两种能够获得稳定钻进运动的途径。


关键词: 非光滑系统, 振动, 冲击, 拍频激励

Abstract:

A mathematical model of impact-progressive mechanical system accounting for the motions of vibration and progressive was developed.That can transfer a high-frequency low-amplitude excitation into low-frequency high-amplitude response.Conditions for synchronous and non-synchronous motions of impact components immediately after the impact were studied.A special beat frequency kinematic excitation was used,which has two distinctive features:①the low-frequency modulated excitation was tuned to the natural frequency(which was the desirable low-frequency) of the vibratory system;②the excitation was asymmetric,i.e.only positive part of the modulated signals excited the mass M2.The results indicate that effective impact forces,i.e. hammer effect,are generated by the excitation.Two different ways to achieve a steady progression were explored.

Key words: non-smooth system, vibration, impact, beat frequency excitation

中图分类号:

O322
TH113.1

苟向锋, 吕小红. 拍频激励下的冲击钻进机械系统动力学特性研究[J]. 中国机械工程, 2012, 23(6): 708-712.

GOU Xiang-Feng, LV Xiao-Gong. Research on Dynamics of an Impact-progressive Mechanical System by Beat Frequency Excitation[J]. China Mechanical Engineering, 2012, 23(6): 708-712.

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