Experimental Evaluation of Percussion Performance for Rock-Drill Drifter

Seo, Jaho; Park, Jin-Sun; Kim, Heungsub; Noh, Dae Kyung

doi:10.5307/jbe.2015.40.1.001

Cited by 5 publications

(5 citation statements)

References 4 publications

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“…The striking point can be judged through the feature of rear-chamber's pressure spike because of impact piston's rebound. Then, the velocity curve of impact piston can be obtained by feeding pressure data of front-chamber and rearchamber into equations (11), (12), and (27), which is shown in Figure 8. After that, the impact velocity can be obtained and so are the impact energy, impact frequency, and impact power Table 2 contains relative deviations between experimental and simulation results.…”

Section: Simulation Model Validation Using Experimental Resultsmentioning

confidence: 99%

“…8,9 However, the structure of percussion system is complicated, and its working process obeys the hydraulic-mechanical-pneumatic coupling laws, 10 which introduces great difficulty in researching on the percussion characteristic of hydraulic rock drill. J Seo and colleagues [11][12][13] developed an analysis model for rock drill using SimulationX software, which was validated by the static calibration and measurement tests of impact frequency and impact energy under three different supply pressure conditions. Based on a simulation model for rock drill built by AMESim, JY Oh et al 14 studied the dynamic performance of percussion system and effects of rock hardness on it.…”

Section: Introductionmentioning

confidence: 99%

“…J Seo and colleagues [11][12][13] developed an analysis model for rock drill using SimulationX software, which was validated by the static calibration and measurement tests of impact frequency and impact energy under three different supply pressure conditions. Based on a simulation model for rock drill built by AMESim, JY Oh et al 14 studied the dynamic performance of percussion system and effects of rock hardness on it.…”

Section: Introductionmentioning

confidence: 99%

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Percussion characteristic analysis for hydraulic rock drill with no constant-pressurized chamber through numerical simulation and experiment

Geng

Jia

et al. 2019

Advances in Mechanical Engineering

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Considering the insufficiency of numerical study on the percussion characteristic of hydraulic rock drill, which restricts the improvement of efficiency and reliability, a coupling model including the impact piston, spool valve, impact accumulator, and connecting pipelines was established taking into account the oil compressibility, oil leakage, and pressure drop in valve ports. The rebound velocity of impact piston was calculated based on the stress wave theory. The simulation results revealed the coupling mechanism of percussion system. Pressure curves of the piston's front-chamber and rearchamber, and valve's left-chamber and right-chamber were obtained by field rock drilling test. Then, the velocity curve of impact piston was obtained after judging the striking point through the feature of rear-chamber's pressure spike, so were the rock drill's impact energy, impact frequency, and impact power. The simulation and experimental results have consistency. And, on this basis, the influence of spool valve's damping clearance (d) and pipeline diameters (d 1 , d 2) connecting the impact piston and spool valve on the percussion performance and system cavitation was researched. The results show that the larger d is better considering reversal time of spool valve, the impact frequency of rock drill, pressure fluctuation, and cavitation relief. But too large d will cause over quick impact velocity of the spool valve, which may lead to strong vibration and the damage of spool valve. The optimal value of d is 0.01 mm by comprehensive consideration. The pipeline diameters have an important influence on the pressure fluctuation and negative pressure in rear-chamber. The diameters should be larger than 18 mm to alleviate the cavitation. This article provides means for the design and research of rock drills.

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Section: Simulation Model Validation Using Experimental Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Percussion characteristic analysis for hydraulic rock drill with no constant-pressurized chamber through numerical simulation and experiment

Geng

Jia

et al. 2019

Advances in Mechanical Engineering

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“…In the impact energy test system developed by Park et al, a target base was constructed with accumulating vibration-isolating materials like sands, broken stones, trees, and rubbers after 5 m depth foundation work to absorb shock and vibration at blowing [18]. Seo et al used a 110 mm steel plate made of SS400 to bear the impact of the drifter rod when evaluating the percussion performance of rock drill drifter [19,20].…”

Section: Introductionmentioning

confidence: 99%

Parameters Optimization and Energy Absorption Evaluation of the Steel Ball Friction Energy Absorber

Gong

2021

Shock and Vibration

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The energy absorber is used to simulate the reaction of a working piece subjected to a vibration stimulus, by which the consistent and repeatable reactions to the tool’s vibration inputs could be achieved. According to the proposed coupling simulation model by using commercial software RecurDyn and EDEM, the energy dissipated by the energy absorber and the contact force between the drill rod and the piston are evaluated under different load conditions such as the impact frequency and impact stroke. Moreover, the effects of the ball diameter, ball column height, and diameter on the energy absorption characteristics are also studied. The results show that the impact frequency and stroke influence the energy absorber by changing the impact force; the energy absorption is more obvious under higher impact frequency and long impact stroke. The filling ball diameter influences the energy reflectivity by changing the porosity, which is negatively correlated to the energy reflectivity, and a 6 mm filling ball diameter is suggested. The energy reflectivity is inversely proportional to the ball column height and diameter, and the suggested ball column diameter and height are 160 mm and 600 mm, respectively, with energy reflectivity of 0.045. Even when the increase in impact frequency and stroke will increase the contact force, the dynamic load factor decreases. The contact force and dynamic load factor are inversely proportional to the ball column height, but they are not influenced by the ball diameter and the ball column diameter.

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“…Among them, breakers are equipment developed to demolish targets by repetitive impact. Although a variety of studies have been conducted to analyze and improve the dynamic behavior of impact devices with hydraulic systems, no study has so far provided a practically realizable design that can be applied to real systems (Noh et al 2014a , b ; Seo et al 2015 ). A hydraulic impact device such as a breaker is dominated by the repulsive properties of the impact target.…”

Section: Introductionmentioning

confidence: 99%

Case study on impact performance optimization of hydraulic breakers

et al. 2016

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BackgroundIn order to expand the range of activities of an excavator, attachments, such as hydraulic breakers have been developed to be applied to buckets. However, it is very difficult to predict the dynamic behavior of hydraulic impact devices such as breakers because of high non-linearity. Thus, the purpose of this study is to optimize the impact performance of hydraulic breakers. The ultimate goal of the optimization is to increase the impact energy and impact frequency and to reduce the pressure pulsation of the supply and return lines.ResultsThe optimization results indicated that the four parameters used to optimize the impact performance of the breaker showed considerable improvement over the results reported in the literature. A test was also conducted and the results were compared with those obtained through optimization in order to verify the optimization results. The comparison showed an average relative error of 8.24 %, which seems to be in good agreement.ConclusionsThe results of this study can be used to optimize the impact performance of hydraulic impact devices such as breakers, thus facilitating its application to excavators and increasing the range of activities of an excavator.

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Experimental Evaluation of Percussion Performance for Rock-Drill Drifter

Cited by 5 publications

References 4 publications

Percussion characteristic analysis for hydraulic rock drill with no constant-pressurized chamber through numerical simulation and experiment

Percussion characteristic analysis for hydraulic rock drill with no constant-pressurized chamber through numerical simulation and experiment

Parameters Optimization and Energy Absorption Evaluation of the Steel Ball Friction Energy Absorber

Case study on impact performance optimization of hydraulic breakers

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