Dynamic characteristics analysis of impact model of composite hammer considering rebound in piling

被引：0
|
作者：
Hu J. [1 ]
Li K. [1 ]
机构：
[1] School of Mechanical and Electrical Engineering, Central South University, Changsha
来源：
Li, Kejun (likejuncsu@126.com) | 2017年 / Central South University of Technology卷 / 48期
基金：
中国国家自然科学基金;
关键词：
Bond graph; Composite hammer; Hammer impact force; Rebound;
D O I：
10.11817/j.issn.1672-7207.2017.02.012
中图分类号：
学科分类号：
摘要：
In view of the phenomenon of pile body damage in the process of pile driving, the impact model of composite hammer filled with mass in the inner cavity was proposed. The lumped parameter method was used to establish the bond graph model of impact model, which introduced the concept of switched power junctions (SPJ) to represent the nonlinear characteristics of contact and separation between masses and cushions, and then the system equations were derived from the model in a unified way. The method of dimensionless analysis was used to analyze the effect of various parameters on the impact force within the Matlab environment. The model was verified experimentally. The results show that the composite hammer causes a lower crest and a longer effective impact time as it has more than one force wave, which also protects the pile body and improves the efficiency of energy transfer. The filling mass and the hammer cushion have the greatest effects on the performance of the hammer, the anvil cushion is the second, and the pile cushion is the smallest. The method can be used to the optimum design and dynamic analysis of the hammer impact system. © 2017, Central South University Press. All right reserved.
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页码：348 / 354
页数：6
相关论文
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