Mathematical modeling of the technological process of the rock destruction by a vibro impact device with a hydro pulse drive.
DOI:
https://doi.org/10.15276/opu.3.56.2018.01Keywords:
impulse, rock formation, shock, vibrations, mathematical model, hydraulic drive, valveAbstract
The high efficiency of the technological process of destruction of the rock with the help of vibration of shock loads has been
proved. A high degree of intensification of the process of rock destruction is achieved by using the developed original design of a vibroimpact device with a hydro-pulse drive based on the two-stage pulsate valve. A new mathematical model has been developed for studying of
technological processes of rock destruction using a vibro-impact device based on the laws of hydrodynamics using the generalized laws of
mechanics. When developing a mathematical model, the technological process was investigated over two phases. This is the phase of kinetic
energy accumulation, as well as the phase of the impact interaction of the working body of the vibro-impact device with the surface of the
rock. The mathematical model of the shock interaction was built based on the Sears impact model and the system of equations of the stressstrain state. Based on the developed mathematical model and using the finite volume method as well as the numerical simulation, the
pressure and velocity of the working fluid in a hydro-pulse drive of a vibro-impact device are obtained. Using the numerical finite element
method, the stress distribution in the working body of the vibro-impact device and the rock element during vibro-impact destruction is
obtained. Analysis of the calculation of the natural frequencies of the working body showed the stable operation of the vibro-impact device
in the preresonanсe modes. The obtained working dependences of the main performance characteristics of the vibro-impact device based on
the impulse allowed us to develop recommendations for further improving the efficiency of the technological process. The obtained results of
numerical simulation of rock destruction technological processes by a vibro impact device based on a hydro-impulse reason, showed the
advantages of the chosen design approach, and allowed to prove the effectiveness of the developed design.
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