title: Case study on impact performance optimization of hydraulic breakers.
abstract: BACKGROUND
  In 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.
  
  
  RESULTS
  The 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.
  
  
  CONCLUSIONS
  The 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.
authors.affiliation: School of Mechanical Engineering, Gachon University, 1342, Seongnamdaero, Seongnam-si, Gyeonggi 13120 South Korea.
authors.forename: Dae-Kyung
authors.initials: DK
authors.lastname: Noh
authors.affiliation: R&D Center, Soosan Heavy Industries Co., LTD., 260, Jeongmunsongsan-ro, Hwaseong-si, Gyeonggi 18628 South Korea.
authors.forename: Young-Ky
authors.initials: YK
authors.lastname: Kang
authors.affiliation: R&D Center, Soosan Heavy Industries Co., LTD., 260, Jeongmunsongsan-ro, Hwaseong-si, Gyeonggi 18628 South Korea.
authors.forename: Jae-Sang
authors.initials: JS
authors.lastname: Cho
authors.affiliation: School of Mechanical Engineering, Gachon University, 1342, Seongnamdaero, Seongnam-si, Gyeonggi 13120 South Korea.
authors.forename: Joo-Sup
authors.initials: JS
authors.lastname: Jang
keywords: Impact energy; Impact frequency; Multiobjective function; Optimization; Pressure pulsation