基于混沌识别的振动压实系统动态设计分析

Dynamic Design for Vibratory Compaction System Basing on Chaos Identification

针对传统的简单动态设计方法,在研究压实系统中忽略非线性混沌态振动对人体身心健康的影响,提出基于系统混沌识别的动态设计方法。通过建立振动压实系统的二自由度动力学模型,采用周期取点构建混沌识别分叉图方法,分析在物料压实初、中、后期3种不同的土壤参数情况下的压实系统非线性振动响应。研究表明,选取机架质量为振动轮质量的0.85～1倍、机架振动固有频率为8～9.5和阻尼比系数为0.195～0.215时,可以弱化系统的非线性特性从而避开混沌振动区。

According to the shortage of traditional design method and the fact that the effects of nonlinear chaotic vibration on human health were ignored in the research of compaction system, a dynamic design method basing on chaos identification was proposed. A two degree of freedom dynamic model was established and the bifurcation diagrams were described for vibratory compaction system. The dynamic responses of the system were analyzed in the cases of three different soil parameters representing the early, medium and later stage of compacted material. Research shows that, selecting the ratio of the frame quality and the vibration wheel quality in the range from 0.85 to 1, the natural frequency of frame in the range from 8 to 9.5 and the damping ratio in the range from 0.195 to 0.215 can weaken the nonlinear characteristics of the system so as to avoid chaotic vibration as much as possible.