基于土壤滞回特性的液压振动锤自同步研究

Research on Self Synchronization of Hydraulic Vibratory Hammer Based on Hysteretic Property of Soil

针对桩土作用对振动锤同步的影响存在考虑不足的情况,在振动模型中采用包含滞回非线性的沉桩阻力模型代替单纯的弹簧阻尼模型,并结合双液压马达模型,得到既能够反映系统的同步振动性能又能反映沉桩能力的无齿轮液压振动锤同步系统模型。利用计算机数值仿真探究了系统参数差异对系统自同步效果和振动锤沉桩性能的影响。研究结果表明:初始相位差和液压马达的泄露差异在小范围内不会影响系统达到自同步,在同步状态下的初始相位差会明显削减系统沉桩性能。最后通过现场试验研究验证了模型和仿真结果的正确性。

As interaction of soil and piles is insufficiently considered in synchronization of vibration hammer, a hysteresis nonlinear pile resistance model is introduced to the vibration model, instead of the simple spring damping model, combined with double hydraulic motor model. The synchronous vibration system model of gearless double hydraulic motor is built, which can reflect the synchronization of vibration system and the drivability of vibration hammer. Numerical simulation is used to explore the effect of system parameters on the system synchronization and the driveability of the vibration hammer. The results show that the initial phase difference and the leakage of the hydraulic motor can not affect the self - synchronization of the system in a small range, and the initial phase difference of the system can significantly reduce the driveability of the vibration hammer. Finally, the correctness of the model and the simulation results are verified by the field experiment.