阐述液压桩机的控制系统；建立液压伺服机构的微分方程和导出传递函数。
This paper first illustrates the control system of hydraulic pile divers, establishes the differential equation of the hydraulic servo and determines the transfer function.
本文介绍了液压振动沉拔桩机的特点、工作原理、安全控制、主要技术性能和应用工作特性。
This paper introduces the features. work principles, safe operations. main technique; properties of the hydraulic vibratory machine for subsiding the stakes.
液压振动系统的主要特点是在桩机液压系统中的压桩油路产生流体压力变化和波动，从而使沉桩力出现高频的周期变化，产生振动压桩的效果。
The main character of the HVS is that, by means of fluctuating oil pressure, the pile-driving force can be changed in a higher frequency, and therefore better vibrating effect can be gained.
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