Design Of Dual-motor Vibratory Pile Driving Hammer’s Key Parameters And Study Of Synchronization Control System

Hydraulic vibratory hammer has becoming a widely used piling machinery in the pile foundation construction, because of its advantages of high efficiency, strong capacity of pile driving and low noise. However, when the traditional hydraulic vibratory hammer drives pile in cohesive soil, it often appears some problems such as low construction efficiency and low reliability of gear transmission system. Therefore, this paper studies the key parameter and Synchro Transmittal Control System of hydraulic vibratory hammer which is suitable for vibratory pile driving in cohesive soil, the main accomplishments of the paper are as follows:1. On the basis of the soil mechanics and the theory of pile sinking, the dynamic model of pile driving in cohesive soil is built, dimensionless analysis power and amplitude are introduced to the simplified driven pile dynamics model. The influence rule of soil damping and static surcharge force on the key parameters of vibratory hammer are revealed. The research results provide theoretical foundation for designing the hydraulic vibratory hammer which is suitable for pile driving in cohesive soil.2. Based on studing the load characteristics of vibration hammer hydraulic system which is suitable for pile driving in cohesive soil, a new dual motors Synchronization hydraulic control system is put forward. This paper uses the new method which is suitable for pile driving in cohesive soil to design the ZZY40B hydraulic vibratory hammer parameters, and then do some work on the type choosing calculation and analysis of the hydraulic vibratory’s key component.3. To improve the synchronization performance of the double-motor system, a fuzzy control theory based on composite synchronization control strategy is advanced. Using transfer function method, an electro-hydraulic proportional closed loop control system is built. A fuzzy PID controller is designed via MALAB-Fuzzy Toolbox, and the simulation results of dual motors synchronization control system prove that the controller can compensate efficiently synchronization error caused by the nonlinear of system and the difference of load in motors.4. Carry out synchronous control of dual-motor vibration hammer experiment research, and verify the validity of the multiple fuzzy control strategy which is proposed in this paper. The results show that this control strategy raises the reliability of synchronous transmission system of vibratory hammer which is in the process of piling effectively.