Simulation Of Hydraulic Vibratory Hammer Based On AMESim

Pile is one of the important foundations and vibratory hammer is the important equipment in pile construction. Mechanical vibratory hammer depends on a pair of opposite rotating eccentric mass block to generate excitation force to carry out the pilling operation. It is widely used in construction projects with the advantages of high efficiency and low cost. Several vibratory hammers are combined in large diameter and deep foundation piling to improve the power.When several vibratory hammers are combined in pile driving, how to realize vibration synchronization is the key problem to ensure piling efficiency. The current method is connecting the driving shaft of every vibratory hammer by mechanical structure to force the synchronization rigidly. In this way, the arrangement of vibratory is inconvenient and the load fluctuation may cause large impaction and friction in gears and reduce the working life of vibratory hammer greatly. So it is significant meaningful to develop a new hydraulic vibratory hammer to realize synchronous vibration, flexible layout and high piling efficiency.In this paper, a hydraulic vibratory hammer using pulsating flow hydraulic excitation is proposed with the advantages of simple structure, reliable synchronization, flexible layout, low cost and simple control.This study includes the design of hydraulic vibratory hammer, the function and main parameters analysis of vibratory hammer and the flow characteristic study of alternating flow generator.Hydraulic vibratory hammer is the power mechanism of the interaction between pulsating flow hydraulic and mobile objects. The interaction of flow, pressure, displacement, acceleration and other time varying parameters can not be solved with traditional dynamics analysis method. In this paper, the software AMESim is used to build the simulation model of hydraulic vibratory hammer system and parameters are set to conduct the simulation analysis. The impact of different excitation frequency and amplitude on system excitation force and the impact of backhaul accumulator and flywheel parameters on system performance are studied. And the parameter which effects system resonance frequency is analyzed.The results show, the system resonates when the excitation frequency is33.4Hz and the amplitude of exciting force is the maximum. The amplitude of exciting force increases with the increasing excitation amplitude. Reasonable setting of backhaul accumulator and flywheel parameters can avoid system pressure beyond the limited value and suppressing rotational speed fluctuation. The system resonance frequency and the amplitude of resonance excitation force decrease with the increasing rodless side chamber length.The results of this study provide references for the design and analysis of hydraulic vibratory hammer.