Optimization of discharge circuit model based on electro pulse boring experiment
Section snippets
Credit author statement
Changping Li: Conceptualization, Data curation, Methodology, Software, Writing – original draft; Longchen Duan: Conceptualization, Project administration; Laijie Wu: Data curation, Investigation; Songcheng Tan: Formal analysis, Data curation; Jun Zheng: Investigation; Victor Chikhotkin:Conceptualization
Discharge circuit model of EPB based on time-varying resistance model
The pulse power supply in EPB generally adopts the capacitance as the energy storage component. The equivalent discharge circuit of EPB is shown in Fig. 1 when the transformer-type pulse power supply is used. It mainly includes electrical circuit time-varying resistance Rt, energy storage capacity C, inductive inductance L, discharge switch S and rock discharge channel resistance Rtd. The inductive inductor includes the inductor generated by the capacitor, the connecting wire and the discharge
Model parameter identification method of least squares for unconstrained nonlinear optimization
The off-line parameter identification method of the discharge circuit model of EPB adopts the voltage and current data, and obtains the parameters of the circuit model through the centralized processing. Among them, the off-line parameter identification methods of the discharge circuit model of EPB can be divided into maximum likelihood estimation, exponential fitting in continuous time domain and recursive least square fitting (Sun et al., 2007; Guo et al., 2016).The traditional parameter
EPB rock-breaking experiments
In order to carry out EPB experiments on different rocks and collect the current parameters in the circuit during the process of EPB, an EPB experiment system is built, as shown in Fig. 3. It mainly includes EPB experiment platform, electrical parameter detection device and transformer step-up type high-voltage pulse power supply. The pulse power supply in the system is developed by He et al. (2013).The system can be used to test EPB effect and electrical parameters when drilling in different
EPB effects and electrical parameter curves of different rock samples
The effect diagrams of EPB in different rocks are shown in Fig. 7. The process and effect parameters of EPB in different rocks are shown in Table 1. It can be concluded that concrete and red sandstone have achieved the drilling of 60 mm full hole diameter under the same discharge parameter setting, when discharging times are 120 times. However, yellow sandstone and red sandstone have not yet completed the drilling of 60 mm full hole diameter. The breaking volume of concrete is 113.04 cm3 and
Conclusions
The equivalent discharge circuit model of EPB based on the variable resistance model is established. EPB experiments on different rocks are made, and EPB rules of different rocks are obtained. Combined with the electrical parameter curve collected in EPB experiment, the parameter identification of the model is carried out based on the least square method of unconstrained nonlinear optimization, the correctness of the optimized model is verified, and the following conclusions are drawn:
- (1)
Based on
Declaration of competing interest
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
Acknowledgements
This work was supported by the National Natural Science Foundation of China (42002310; 41972327; 41672364) and External Cooperation Program of Science and Technology Department of Hubei Province (2019AHB051). Thanks to professor He Mengbing in Huazhong University of Science and Technology for providing the high-voltage pulse power supply in the process of EPB experiment.
References (43)
- et al.
Liberation of valuable inclusions in ores and slags by electrical pulses
Powder Technol.
(2001) Electrical disintegration and micro-focus X-ray CT observations of cement paste samples with dispersed mineral particles
Miner. Eng.
(2014)- et al.
Influence of the applied pressure waveform on the dynamic fracture processes in rock
Int. J. Rock Mech. Min. Sci.
(2004) - et al.
Theoretical analysis and experimental research on the energy dissipation of rock crushing based on fractal theory
J. Nat. Gas Sci. Eng.
(2016) - et al.
Parameter identification and sensitivity analysis of solar cell models with cat swarm optimization algorithm
Energy Convers. Manag.
(2016) - et al.
Damage model and numerical experiment of high-voltage electro pulse boring in granite
Energies
(2019) Experimental and numerical analyses of electro-pulse rock-breaking drilling
J. Nat. Gas Sci. Eng.
(2020)Investigations on thermal spallation drilling performance using the specific energy method
J. Nat. Gas Sci. Eng.
(2018)- et al.
Numerical simulation of high voltage electric pulse comminution of phosphate ore
International Journal of Mining Science and Technology
(2015) - et al.
The influence of equipment settings and rock properties on high voltage breakage
Miner. Eng.
(2013)