Finite Element Analysis And Structure Optimization Of Hydraulic Power Impacting Piling Machine

The hydraulic power impacting piling machine is a kind of rock drilling machinery,which is applied an impact hammer movement that act on precast piles. It is widely used in the construction industry, because of its high efficiency, environmental pollution, easy to move. In this paper, a new type of hydraulic power impacting piling machine’s impact of the mechanical system is researched. The whole system of hydraulic power impacting piling machine and pile-soil finite element model of interactions is established. The hydraulic power impacting piling machine’s impact of mechanical systems and pile under pile-soil dynamic response are analyzed. To investigate the effect of physical properties of the impact of the mechanical system parameters on the pile. On the impact of the key components of mechanical systems for structural parameters is optimized. The theoretical basis is provided of the structural design and practical engineering application of new hydraulic power impacting piling machines.The main work of this thesis can be summarized as follows:(1)ALE method using reason is given to structural characteristics and working principle of the new hydraulic power impacting piling machine and to consider soil deformation. Using the finite element software ANSYS / LS-DYNA build hydraulic power impacting piling machine and pile-soil finite element model of the whole system. Experimental test platform is set up by using stress wave method, experimental results are consistent with the simulation results. A model-based analysis is provided of the dynamic response of hydraulic power impacting piling machine’s impact of the mechanical system.(2)The hydraulic power impacting piling machine and pile-soil finite element model of the whole system obtain the dynamic response characteristics hammer, transfer case, trolley and pile cap are obtained. The precast pile size and bulk modulus of the soil bearing capacity of the pile at the bottom is analyzed. The basis to judge is provided for the hydraulic power impacting piling machine choice engineering environment.(3)The mechanical systems of pile driving efficiency, pile bottom bearing stress and penetration are analyzed of different spring stiffness and pile cushion. The trends of different physical conditions sinking piles efficiency performance parameters and pile end bearing stress is obtained. The theory reference is provided of the hydraulic power impacting piling machine’s pile cushion pad spring stiffness and elastic modulus parameters’ selection.(4)BP neural network model is established of transmission box bottom plate thickness, side panel thickness, transfer box and rod connecting plate aperture and power transmission boxes and rod maximum stress. The lightest of transfer power box and rod is the optimization objectives. Application of genetic algorithms for power transmission box bottom plate thickness, the thickness of the side force transmission box, transfer box and connecting rod aperture plate structural parameters optimized. The theoretical basis is provided for the design of structural parameters of the hydraulic power impacting piling machine.