Numerical solution for dynamics of pneumatic DTH hammer system
摘要
The pneumatic down-the-hole(DTH) hammer is one of the efficient equipments used in medium hard to veryhard rock drilling frield, and any change in its structure design affects all performance parameters of a pneuamtic DTHhammer directly. Yet, owing to the complexity of the dynamic interaction among the components in DTH hammer systems,until now it has been difficult to obtain reliable estimates of the design parameter affects. Thus providing an design parame-ter optimization and the layout of dynamics behavior of DTH hammer is of great importance. This paper documents the de-velopment and solution of a computational model for the dynamic response of a pneumatic DTH hammer. The model consistsof rigid piston dynamics equation and chamber thermodynamics equations. The resulting model represented by a set of cou-pled nonlinear differential equations were computed in Visual C++program. The developed solutions are used to performa parametric study to illustrate the inftluence of the piston mass and supply pressure on the impact performance of DTHhammer system.