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Journal of Mechanical Science and Technology

, Volume 33, Issue 11, pp 5589–5602 | Cite as

Design study of impact performance of a DTH hammer using PQRSM and numerical simulation

  • Dae-Ji Kim
  • Joo-Young Oh
  • Jung-Woo Cho
  • Jaewon Kim
  • Jintai ChungEmail author
  • Changheon SongEmail author
Article
  • 45 Downloads

Abstract

This paper presents a simulation model to predict the percussive drilling performance of a down-the-hole (DTH) hammer. First, the pneumatic dynamic model of the DTH hammer is developed considering mass flow rate relations representing orifice opening areas of the air tube, the piston, and the bit flushing channels. Next, the performance of the DTH hammer is numerically simulated and evaluated by considering fluctuations of the upper and lower chamber pressure, impact frequency, and force. The simulation model is validated through a series of laboratory tests. Finally, design factors influencing the hammers impact performance are selected via screening design, and the progressive quadratic response surface method then optimizes the set of design factors to propose a design modification to increasing the impact performance of the DTH hammer.

Keywords

Down-the-hole drilling Down-the-hole hammer Percussive rock drilling Impact performance; Screening design method Progressive quadratic response surface method (PQRSM) 

Nomenclature

Aii

Projected area (i = 1, 2, 3,…, n) [m2]

Au, Al

Piston area of upper and lower side [m2]

As

Inlet area [m2]

ali

Opening area (into the lower chamber) [m2]

auo

Opening area (discharged from the upper chamber to the outside) [m2]

alo

Opening area (discharged from the lower chamber to the outside) [m2]

Cd, Cmi

Mass flow coefficient

cij

Coefficient of approximate function

Ep

Young’s modulus of piston [N/m2]

Fre

Rebound force [N]

kc

Poppet spring constant [N/m]

mc, mp i

Poppet and piston mass [kg]

i

Mass flow rate (i = 1, 2, 3,…, n) [kg/s]

n

Number of design variable

Pa

Atmosphere pressure [Pa]

Pu, Pl

Pressure of upper and lower chamber [Pa]

Ps

Supply pressure [Pa]

Pup, Pd

Upstream and downstream pressures [Pa]

Qs

Supplied mass flow rate [kg/s]

R

Ideal gas constant [m2/s2K]

S1

Initial trust region

S2

New trust region

Ts

Operating temperature [K]

Vi

Control volume (i = 1, 2, 3,…, n) [m3]

Vu, Vl

Upper and lower chambers of DTH hammer [m3]

Vuo, Vlo

Initial control volume of front and rear chambers [m3]

ve

Rebound velocity of piston [m/s]

x

Design variable vector

xc

Displacement of poppet [m]

p

elocity of poppet [m/s]

p

Acceleration of poppet [m/s2]

xp

Displacement of piston [m]

p

Velocity of piston [m/s]

p

Acceleration of piston [m/s2]

Yi

Objective function

ij

Approximation of Yi

α

Poppet head cone angle [rad]

θ

Hammer inclination angle [rad]

μ

Specific heat ratio

ρp

Density of piston [kg/m3]

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Notes

Acknowledgments

This work was supported by Korea Institute of Industrial Technology (KITECH), South Korea.

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Copyright information

© KSME & Springer 2019

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringHanyang UniversityGyeonggi-doKorea
  2. 2.Construction Equipment R&D GroupKorea Institute of Industrial TechnologyDaeguKorea

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