液压振动桩锤自同步条件的研究及仿真

Research and simulation of hydraulic vibratory pile hammer under condition of self-synchronous

在液压振动锤的运转过程中,如果能实现同步振动就能使产生的巨大的振动能量充分用于沉桩,避免消耗于无效且有害的桩体水平和环向振动。因此如何实现桩锤的同步稳定运转显然是非常重要的。通过理论分析及数学建模,得出了提高振动锤同步性的方法,并通过Matlab/Simulink仿真结果证明了该方法的正确性。研究结果表明:提高振动桩锤的转速、偏心块质量矩和稳定性指数的绝对值,以及减小两马达的特性差异、转子的重力矩差和两摩擦阻力矩差都有助于提高振动桩锤的同步性。

During the hydraulic vibration hammer operation, a large vibration energy can be fully used for pile driving and can avoid the ineffective and harmful consumption in the pile body＇s level and loop vibration if synchronous vibration can be achieved. Therefore, how to realize the synchronization and stability of the pile hammer operation is obviously very important. Through theoretical analysis and mathematical modeling, the method of improving the synchronization of vibration hammer was obtained, and the correctness of the method was proved by simulation of Matlab/Simulink. The results show that it＇s favorable for improving the synchronization of vibratory pile hammer to raise the rotate speed of vibration pile hammer, the mass moment of eccentric block and the absolute value of stability index,and to reduce the characteristic differences of the two motors, the differences of rotor gravity torque and two friction moment differences.