Abstract
Two-hammer synchronous vibration system which consists of two hammers is a complex electromechanical system with complex electromechanical coupling. In this paper, electromechanical coupling characteristics of this system are studied in detail using the methods of theoretical derivation, numerical simulation and experiment. The kinetic models of this system are established, and approximate expressions of electromechanical coupling strength are solved using periodic averaging method (PAM). Basic coupling rules and reasons are obtained. Subsequently, numerical simulation is carried out, and simulation results demonstrate the correctness of model and approach. After that, based on electromechanical coupling characteristics, compound synchronization error feedback and composite control based on inching control (CSEB-CCBIC) strategy and algorithm are proposed, and simulation results validated the effectiveness of the proposed strategy. Finally, experiments are carried out, and the results show that, speed and phase achieve synchronization quickly under the action of synchronization controller, which are agree well with theoretical and numerical results. The research conclusions and methods also provide theoretical foundations for multi-hammer synchronous vibration system and its synchronization control.
Highlights
The vibratory hammer driven by electromotor is widely used in construction engineering
The simulation model is established according to Eqs. (5)-(10), and the electromechanical coupling process is obtained by numerical simulation using previously mentioned ideal conditions
The composite control based on inching control (CCBIC) can reduce or eliminate the effect of electromechanical coupling on motor torque, which improves control precision of phase synchronization and avoids overshoot effectually
Summary
The vibratory hammer driven by electromotor is widely used in construction engineering. Used eight linked pile hammers while working on the man-made island project (Hong Kong-Zhuhai-Macao Bridge, China) [2] In these engineering applications, the shaft coupling has been applied to connect the rotating shaft of each vibratory hammer. Wen et al [10,11,12,13,14] established the synchronization condition of two vibratory hammers, and applied it to engineering successfully About this method, there are strict requirements on structure and dynamic characteristics of the mechanical system, and easy to out of step, it is not suitable for all mechanical systems. This work in this paper aimed to design an effective synchronization controller on the basis of solving electromechanical coupling characteristics of two-hammer synchronous vibration system.
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