A percussion performance analysis for rock-drill drifter through simulation modeling and experimental validation

Seo, Jaho; Noh, Dae-kyung; Lee, Geun-Ho; Jang, Jun Tae

doi:10.1007/s12541-016-0021-0

Cited by 18 publications

(10 citation statements)

References 8 publications

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“…Yang et al (2017) experimentally analy zed the dynamic characteristics of impact systems to obtain the stress wave curves of a jack rod at different impact velocit ies. Th rough the comparison between the analysis and experimental results, Seo et al (2016) validated the reliability of the analytical model is verified, and the effect of the main factors on the impact frequency and impact energy is understood by using the verificat ion results. Their analytical results indicated that the work area of the piston chamber is the main factor that affects impact energy and frequency.…”

Section: Introductionmentioning

confidence: 73%

Existence scope of only primary vibration within one impact period of a hydraulic drifter piston via point transformation

Yang

Hong

Li³

2018

JAMDSM

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The impact p rocess of hydraulic drifter is a periodic vibrat ion course with position feedback and p iston control by shuttle valve. For the phenomena of secondary or mult iple v ibrations within one period during cyclic impact process of hydraulic drifter, this study establishes a dynamic mod el of the system during hydraulic impact and analyzes the vibration behavior of piston in the impact process of hydraulic drifter fro m the perspectives of velocity recovery coefficient R, acceleration ratio K F , and accelerat ion switching t ime K t . Then, the impact point position for the nonlinear periodic motion of the piston is observed through point transformation and Jacobian technique. Subsequently, a spatial scope defined by correlated system parameters R, K F , and K t is identified, within this scope, the p iston only stably vibrates once within one impact period. Finally, the position of the signal port is redesigned on the basis of the existence scope, and the design parameters for the hydraulic drifter are improved. The correctness of the derivation p rocess and the conclusion of this study are experimentally verified. The present findings provide a basis for reasonably match ing the relationships among design parameters and can help improve drifter impact efficiency.

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Section: Introductionmentioning

confidence: 73%

Existence scope of only primary vibration within one impact period of a hydraulic drifter piston via point transformation

Yang

Hong

Li³

2018

JAMDSM

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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%

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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“…Through an analysis of a rock drill impact module, Oh developed the impact performance analysis tool and analyzed the variation law of energy utilization rate for hydraulic impactor relative to rock stiffness [3]. Taking into considering the leakage and friction of impact piston pair, Seo analyzed the performance of the hydraulic impactor through simulation, then put forward the design method of structural parameters of the impact piston and determined the range of piston parameters [4]. Flegner tested the friction and wear of piston during the drilling process of hydraulic impactor under different drilling pressures and rotational speeds.…”

Section: Introductionmentioning

confidence: 99%

Effect of Texture on Energy Consumption for High Frequency Hydraulic Impact Piston Pair

Mo¹,

Guo²,

Yan-ping³

et al. 2020

Preprint

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Limited by the influence of the traditional clearance seal structure on the leakage and friction loss of the piston pair, the energy utilization ratio of the hydraulic impactor is difficult to improve. As such, a novel clearance seal structure with cylindrical texture for the impact piston is proposed to solve it. Considering the leakage and friction loss of impact piston pair, an energy consumption evaluation index is put forward. Based on the average Reynolds equation, an energy consumption analysis model for a textured high-frequency hydraulic impact piston pair is established, and the influence of piston texture parameters for the YG45 hydraulic impactor on energy consumption under rated working conditions is studied. The results show that energy consumption of an impact piston pair accounts for 29.77% of total energy loss. The variation of area ratio textured makes the ratio of energy consumption to the piston pair decline 1.32%~10.98%, where the optimum area rate textured is 0.64 ~ 0.7. The variation of depth ratio textured leads to the reduction of the ratio of energy consumption to piston pair by 3.21% ~ 5.68%, where the optimum depth ratio textured is 1 ~ 1.1.The texture structure of the piston pair significantly reduces the energy consumption of the impact piston pair, and it is an effective approach to avoid the design dilemma for the conventional impact piston pair.

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A percussion performance analysis for rock-drill drifter through simulation modeling and experimental validation

Cited by 18 publications

References 8 publications

Existence scope of only primary vibration within one impact period of a hydraulic drifter piston via point transformation

Existence scope of only primary vibration within one impact period of a hydraulic drifter piston via point transformation

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

Effect of Texture on Energy Consumption for High Frequency Hydraulic Impact Piston Pair

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