水压驱动式打桩机系统动力学建模与仿真分析

发布时间：2018-04-24 05:11

本文选题：水压驱动式打桩机 + 冲击器　；参考：《湖南科技大学》2013年硕士论文

【摘要】：水压驱动式打桩机是一种新型液压打桩机，它以水压冲击器作为动力装置。与传统油压型液压打桩机相比，具有绿色环保、无油液泄漏等特点。本文以水压驱动式打桩机为研究对象，综合运用机械系统动力学、液压传动与控制、机械振动学、有限元分析等理论和方法，详细阐述了水压驱动式打桩机结构及其动力学特点，系统分析了水压打桩机驱动及工作原理。围绕水压驱动式打桩机液压系统和打桩系统开展相关研究，主要内容如下。（一）对水压驱动式打桩机液压系统进行动力学建模和仿真研究。在分析水压式打桩机冲击器工作机理的基础上，构建其液压系统功率键合图及其AMESim仿真模型。通过仿真研究，得到活塞、配流阀芯的运动曲线，并详细分析它们的运动规律。再进一步分析活塞前腔、活塞后腔、阀左交变腔和阀右恒压腔的流量，压力和作用力变化规律。研究探讨输入流量、溢流阀调整压力、活塞质量、前腔开口长度、中间腔开口长度等五个参数对冲击性能的影响规律。（二）对水压驱动式打桩机打桩系统进行动力学建模与仿真分析。在分析水压驱动式打桩机打桩系统的工作原理基础上，采用动力学及机械振动学等相关理论，，构建打桩系统AMESim仿真模型。通过仿真，得到在打桩冲击过程中，活塞、砧座和桩在冲击瞬间动态响应特性和运动规律。最后，研究砧座刚度、桩体刚度对打桩性能的影响规律。（三）对水压驱动式打桩机打桩系统中的冲击元件进行有限元分析，使用Ansys/ls-dyna有限元软件，研究了冲击元件-活塞与砧座在正常工作时应力分布情况。研究了砧座键槽改进后，打桩系统中活塞、砧座应力分布应力状况及特点。研究了取消键槽后，打桩系统中活塞与砧座应力分布应力状况及特点。
[Abstract]:Hydraulic driving pile driver is a new type of hydraulic pile driver, which uses hydraulic impactor as power device. Compared with the traditional hydraulic pile driver, it has the characteristics of green environment protection and no oil leakage. In this paper, the hydraulic driving pile driver is taken as the research object, and the theories and methods of mechanical system dynamics, hydraulic transmission and control, mechanical vibration, finite element analysis and so on are used synthetically. The structure and dynamic characteristics of hydraulic driving pile driver are described in detail. The driving principle and working principle of hydraulic pile driver are analyzed systematically. This paper focuses on hydraulic system and piling system of hydraulic driving pile driver. The main contents are as follows. (1) dynamic modeling and simulation study on hydraulic system of hydraulic driving pile driver. On the basis of analyzing the working mechanism of hydraulic pile driver impactor, the power bond graph of hydraulic system and its AMESim simulation model are constructed. The kinematic curves of piston and valve core are obtained by simulation, and their motion laws are analyzed in detail. The flow, pressure and force of the front cavity, the back cavity, the left alternating chamber and the right constant pressure chamber of the valve are further analyzed. The effects of five parameters, such as input flow rate, relief valve adjustment pressure, piston mass, opening length of front cavity and opening length of middle cavity, on impact performance are studied. (2) dynamic modeling and simulation analysis of hydraulic driving pile driver piling system. Based on the analysis of the working principle of the piling system of hydraulic driven pile driver, the AMESim simulation model of piling system is constructed by using the relevant theories of dynamics and mechanical vibration. Through simulation, the dynamic response characteristics and motion law of piston, anvil seat and pile are obtained in the course of piling impact. Finally, the influence of anvil stiffness and pile stiffness on piling performance is studied. (3) the finite element analysis of the impact element in the piling system of the hydraulic driving pile driver is carried out. The stress distribution of the impact element, the piston and the anvil, is studied by using the Ansys/ls-dyna finite element software. The stress distribution and characteristics of piston and anvil in piling system are studied after the improvement of anvil seat keyway. The stress distribution and characteristics of piston and anvil in piling system are studied.
【学位授予单位】：湖南科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU67

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