双激振模式下的压实系统整体动力学分析与试验

发布时间：2018-04-15 05:16

本文选题：压实系统 + 动力学模型　；参考：《振动与冲击》2017年11期

【摘要】：双钢轮振动压路机在双激振模式下,存在特有的振动特性,综合考虑不同压实阶段土壤物料的非对称滞回特性和前后轮可能跳振脱耦的实际工况,提出7自由度整体动力学模型,一次近似下,采用谐波线性化和Krylov Bogolyubov Mitropolsky(KBM)相结合的方法获得不同压实阶段的等效刚度和阻尼,并系统研究驾驶室由于前后轮振动频率差引起的拍振运动特性,在不同的压实工况模型参数下,庞加莱运动截面体现出单周期,双周期分叉,三周期直至多周期的非线性运动特性;压实中后期,系统产生高次超谐波共振和亚谐波共振,在大的激振力和低频作业下,驾驶室拍振运动进入混沌振动,通过合理调整激振力和双激振频率,可以有效地抑制混沌,从而延长压路机零部件的使用寿命和提高操作舒适性,现场的施工压实试验验证了提出模型和理论分析的合理性。
[Abstract]:The vibratory roller with double steel wheels has its own vibration characteristics under the dual excitation mode. Considering the asymmetric hysteretic characteristics of soil materials in different compaction stages and the actual working conditions that the front and rear wheels may jump vibration and decouple.A global dynamic model with 7 degrees of freedom is proposed. In the first order approximation, the equivalent stiffness and damping at different compaction stages are obtained by using the method of harmonic linearization and Krylov Bogolyubov Mitropolsky KBM.The vibration characteristics of the cab caused by the difference of vibration frequency between front and rear wheels are studied systematically. Under different compaction mode parameters, the Poincare motion cross section shows single cycle and double period bifurcation.In the middle and late period of compaction, the system produces high order super harmonic resonance and subharmonic resonance, and under the condition of large excitation force and low frequency operation, the vibration of the cab is chaotic.The chaos can be effectively suppressed by adjusting the excitation force and the frequency of double excitation reasonably, thus prolonging the service life of the components of the roller and improving the operating comfort. The rationality of the proposed model and theoretical analysis is verified by the field compaction test.
【作者单位】：福建船政交通职业学院;福州大学机械工程及自动化学院;
【基金】：国家自然科学基金(51175086) 福建省高校杰出青年科研人才培育计划(JA11299) 福建省交通运输厅科技发展计划(201120) 福建省自然科学基金(2015J01186)
【分类号】：U415.521

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