顶拉式液压动力沉桩机动力学特性仿真分析

发布时间：2018-05-31 00:25

本文选题：顶拉式液压动力沉桩机 + AMESim　；参考：《湖南科技大学》2013年硕士论文

【摘要】：基于液压桩机原理，通过增加承击块及拉杆等结构，设计了顶拉式液压动力沉桩机，即冲击锤直接作用于承击块上，承击块再通过拉杆、桩帽结构最终带动桩杆运动，使受击点在动力室内，动力室经外加固定隔音层，可降低噪声以适应城市居住环境要求。本文以顶拉式液压动力沉桩机为研究对象，对其动力学特性进行仿真分析，主要研究工作如下：顶拉式动力沉桩机工作原理及结构分析。介绍了顶拉式液压动力沉桩机的冲击机械结构，为顶拉式动力沉桩机的冲击结构建模奠定基础。重点分析了冲击锤、承击块、拉杆及桩帽等构件在整个沉桩工作中的动作过程。顶拉式动力沉桩机液压系统原理及建模。根据液压传动，建立顶拉式动力沉桩机液压系统模型，并阐述顶拉式动力沉桩机液压系统工作过程及原理；基于振动力学原理，，将冲击锤、承击块和桩帽视为刚体，将拉杆简化为弹性杆，建立液压动力沉桩机冲击系统中冲击锤、承击块等零部件力学方程；借助AMESim仿真软件构建顶拉式动力沉桩机液压系统、冲击机械及电控仿真模型；运用力平衡方程、流量连续性方程等建立主要元件动态数学模型，并查阅、计算了仿真模型主要参数。顶拉式液压动力沉桩机动态特性仿真分析。通过仿真分析验证冲击能量、冲击锤下冲加速度及频率等是否满足技术性能参数要求；基于仿真模型，通过改变顶拉式液压动力沉桩机系统中冲击锤、承击块、拉杆及桩阻力等关键参数数值，研究其对动力沉桩机液压冲击系统的动态性能影响，为顶拉式液压动力沉桩机冲击机械系统的结构设计和效能评估提供了理论依据。
[Abstract]:Based on the principle of hydraulic pile machine, a hydraulic driving piling machine with top pull type is designed by adding bearing block and pull rod, that is, the impact hammer acts directly on the bearing block, and then the bearing block passes through the pull rod, and the pile cap structure finally drives the pile rod movement. The impact point is in the power room, and the noise can be reduced to meet the requirements of the urban living environment by adding the fixed sound insulation layer to the power chamber. In this paper, the dynamic characteristics of hydraulic driving piling machine are simulated and analyzed. The main research work is as follows: Working principle and structure analysis of top-pull dynamic piling machine. The impact mechanical structure of hydraulic driving piling machine with top pull is introduced, which lays a foundation for the modeling of impact structure of top pull power piling machine. The action process of impact hammer, bearing block, pull rod and pile cap in the whole piling work is analyzed. Principle and modeling of hydraulic system of top-pull dynamic piling machine. According to the hydraulic transmission, the hydraulic system model of the top pull type power piling machine is established, and the working process and principle of the hydraulic system of the top pull type power piling machine are expounded, and the impact hammer, bearing block and pile cap are regarded as the rigid body based on the vibration mechanics principle. The mechanical equations of impact hammer, bearing block and other parts in the impact system of hydraulic power piling machine are established by simplifying the pull rod as elastic rod, and the hydraulic system, impact mechanism and electric control simulation model of the top pull driving machine are constructed with the help of AMESim simulation software. The dynamic mathematical model of main components is established by force balance equation and flow continuity equation, and the main parameters of simulation model are calculated. Simulation analysis of dynamic characteristics of hydraulic driving piling machine with top-pull type. Simulation analysis is used to verify whether the impact energy, impact acceleration and frequency of impact hammer meet the requirements of technical performance parameters. Based on the simulation model, the impact hammer and bearing block are changed by changing the impact hammer in the hydraulic driving machine system of top pull type hydraulic power piling machine. The effects of the key parameters, such as rod and pile resistance, on the dynamic performance of hydraulic impact system of dynamic piling machine are studied, which provides a theoretical basis for the structural design and effectiveness evaluation of the impact mechanical system of the top pull hydraulic driving piling machine.
【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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