双激振模式下的压实系统整体动力学分析与试验  

Analysis and tests for dynamic characteristics of a compacted System under double-excitation

作　　者：沈培辉[1] 林述温[2] SHEN Peihui LIN Shuwen(Fujian Chuanzheng Communications College, Fuzhou 350007, China College of Mechanical Engineering and Automation, Fuzhou University, Fuzhou 350002, China)

机构地区：[1]福建船政交通职业学院,福州350007 [2]福州大学机械工程及自动化学院,福州350002

出　　处：《振动与冲击》2017年第11期232-241,共10页Journal of Vibration and Shock

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)

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。A double-steel-wheel vibratory roller possesses special vibration characteristics under double-excitation. Considering the asymmetric hysteretic characteristic of soil material in different compacting stages and the possibility of jump-vibration decoupling between the two vibratory wheels in actual working conditions, a 7-DOF overall model was put forward. Using the first order approximation, the equivalent stiffness and damping in different compacting stages were obtained with the harmonic linearization and KBM （ Krylov-Bogolyubov-Mitropolsky） combined method. In addition, beat- vibration characteristics of the roller cab due to the difference between vibration frequencies of the front wheel and the rear one were systematically studied. Under model,s parameters in different working conditions, it was shown that Poincare motion sections reflect nonlinear motion characteristics of a single period bifurcation, a double-period one, a three-period one and a multi-period one ; the dynamic system produces higher order super-harmonic and sub-harmonic resonances during later compacting stages; with a larger exciting force and a lower frequency condition, the cab enters a chaos vibration ; through adjusting excitation forces and the excited frequencies of the double-wheel reasonably, the chaos vibration can be suppressed effectively, the service life of the roller components can be extended and the operating comfort can be improved. The worksite compacting operation tests verified the rationality of the proposed model and theoretical analysis.

关 键 词：压实系统 动力学模型 拍振 脱耦 混沌 

分 类 号：TU663[建筑科学—建筑技术科学]