Research On Virtual Prototyping Of Hydraulic Hammer

Hydraulic hammer is a fragmentation tool converting hydraulic energy intomechanical energy with the piston’s reciprocating motion to output energy. With thedevelopment of the infrastructure and energy transportation, there is an increasing demandof hydraulic impactor in the industries. So it is important to improve product design andperformance in the competitive market. After understanding the simulation andoptimization technology for hydraulic impactor at home and abroad, we have made thedynamic simulation analysis and experimental research for hydraulic impactor with theguidance of combination of theoretical study and practical application and with thetechnical route that integrated computer simulation and experimental analysis. On the basisof the two methods, the structural parameters for the virtual prototype of the hydraulichammer are optimized to improve its performance. The main contents of this paper aresummarized as follows:Firstly, an assembly model of three-dimensional hydraulic hammer established withCATIA is imported to ADAMS based on the multi-body dynamics theory. The measuredvariables of the system are built and the input and output variables are created throughsetting the port position of piston and valve core. Parametric model of hydraulic hammer isestablished in ADAMS/View, which provides the matching prototype model for theparameters optimization of the system.Secondly, a mathematical model of piston and valve core movement is set up incertain assumptions and the whole process is divided into six phases. The control model ofsystem is built in MATLAB/Simulink and the co-simulation of hydraulic hammer can berun successfully. Parameters obtained by the simulation are similar to the data provided bymanufactures. It is demonstrated that the model and control method of the system is soreliable that an ideal platform for the performance analysis for the hydraulic hammer has been found.Thirdly, the curves of the operating parameters of hydraulic hammer are obtained inthe different flow and different initial pressures of nitrogen chamber after severalexperiments. The variation rules of impact properties are obtained with different inputparameters. The test data of Nitrogen chamber pressure and velocity of piston arecompared with the simulation samples to demonstrate the rationality of virtual prototypemodel.Finally, in accordance with the method of parametric analysis, a set of optimal designparameters are acquired by research on design, test and optimization of structureparameters of position and valve core system in the virtual prototype model of hydraulichammer. Eventually, the impact energy of hydraulic hammer can be got improved byreducing the upper and lower effect area ratio of piston and valve core in the originalvirtual prototype model and changing the port position of commutation signals of pistonand valve core.Virtual prototyping successfully is introduced in the research and development ofhydraulic impactor, which is not only of theoretical significance but also has certainpractical values. It will build a good platform for the product development of hydraulicimpactor and provide the reliable virtual prototype for comprehensive research andimproving the performance of hydraulic hammer.