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Based on FM modulation moment vibratory hammer dynamic analysis of mechanical damping system

Author: Wang
Tutor: ZhaoWeiMin
School: Daqing Petroleum Institute
Course: Engineering Mechanics
Keywords: Vibratory hammer Damping system Coil spring Rubber spring Finite Element Analysis
CLC: TU67
Type: Master's thesis
Year: 2006
Downloads: 273
Quote: 1
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Abstract


With the further development of infrastructure, various large construction are made on the basis of the development of a new topic. Pile foundation using foundation than with other types have a greater carrying capacity, the construction more convenient, easier to implement mechanization of construction, is the wider application of basic engineering, the fastest growing form of a foundation. With industrial technology, especially the development of vibration technology, a strong impetus to the application of vibration pile hammer and development, making it the main piling machinery models. But in the actual construction, vibration damping system configuration hammer because improper construction accidents often occur, affecting the progress of the operation. Therefore it is necessary to hammer vibration damping system for in-depth study of the mechanical design and construction to provide a theoretical basis. In this paper, the development of domestic and foreign Vibratory pile hammers a comprehensive description and analysis of hydraulic vibratory pile hammer point is the development direction; pile hammer vibration damping system for the basic structural characteristics analyzed, and confirmed the need to study damping system. This liquefaction vibration theory based on the use of the vibrating pile hammer tone moments, AM, FM institutions and damping system for a detailed analysis. Through the study found, the exciting force and the center of gravity plane vibratory hammer, hammer vibration damping system, the geometric center coincide is essential. When these few do not coincide, the force on each coil spring has almost doubled, and the status of each of the spring force is not the same. Inevitably lead to such a large gap between the vibratory hammer unstable operation and therefore must be given sufficient attention. In this paper, vibratory hammer can be used for a variety of coil spring finite element stress, strain, displacement calculation and analysis. When the spring maximum diameter and pitch is determined, the maximum load and deformation appears in a recent mutation from the loading site. Laterally offset from the extent that the usual equal diameter springs and intermediate cylinder, both ends of the conical spring for the best; spring wire cross-section than the outer to the inner stress large cross-section of changing load on the spring is prone to fatigue failure due to . The deformation of the spring from every point of view, with the coil spring bearing uneven, prone to shift, so the placement of vibratory hammer spring damping system should spin around in pairs, otherwise it will cause vibration hammer polarization. Papers presented in the rubber spring embedder thin metal plate so that the rubber sheet, rubber sheet to increase the shape factor of the program to remove the carrying capacity of the rubber spring is weak, the shortcomings of deformation is too large, and the program was Based on detailed analysis of the finite element method. Confirmed by analyzing the effective use of embedded steel sheet. Paper concludes that: vibratory hammer will, UHF direction, with stepless variable torque capabilities to achieve mechatronic control systems, intelligent job of research; Low noise damping system development and operational reliability studies; High frequency vibrator vibration-resistant performance, high-speed transmission lubrication research; soil characteristics under high-frequency vibration and the impact of the construction process is the key technology.

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CLC: > Industrial Technology > Building Science > Construction machinery and equipment > Piling Machinery
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