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Hongseob KIM,Jihan KIM,Bo-Yeong Kang,JongWoon Woo,Hyung-taek Baek 제어로봇시스템학회 2020 제어로봇시스템학회 국제학술대회 논문집 Vol.2020 No.10
Conceptual design of test equipment to evaluate grasp strength of gripper for robotic manipulator is specified. As usage and installation rate of robotic manipulator has been increased, importance of performance evaluation of end-effector, specifically gripper has become one of the most important factors for safe usage of robotic arm in the field of industry. In order to secure safety workplace, especially where robotic manipulators handle heavy objects, apply rightful gripper by using exact capability. Under this circumstance, grasp strength of gripper has been key factor to evaluate performance of gripper and robotic manipulation. Thus, we have developed mechanical factors in regards of test equipment in order to achieve higher level of test result by considering two points. One of them is modularity of test equipment and the other one is to make the equipment adjustable on sensor location.
Kim, Eon-Kyoung,Oh, Hongseob,Sim, Jongsung Hindawi Limited 2014 Mathematical problems in engineering Vol.2014 No.-
<P>Deterioration of concrete bridge decks affects their durability, safety, and function. It is therefore necessary to conduct structural rehabilitation of damaged concrete decks by strengthening them with fiber-reinforced polymer. Of the recent studies on the strengthened structures, most have focused on static behavior; only a few studies have investigated fatigue behavior. Accurate analysis of fatigue in concrete deck performance requires a more realistic simulated moving load. This study developed a theoretical live-load model to reflect the effect of moving vehicle loads, based on a statistical approach to the measurement of real traffic loads over various time periods in Korea. It assessed the fatigue life and strengthening effect of bridge decks strengthened with either carbon fiber sheets or grid carbon fiber polymer plastic using probabilistic and reliability analyses. It used extrapolations and simulations to derive maximum load effects for time periods ranging from 1 day to 75 years. Limited fatigue tests were conducted and probabilistic and reliability analyses were carried out on the strengthened concrete bridge deck specimens to predict the extended fatigue life. Analysis results indicated that strengthened concrete decks provide sufficient resistance against increasing truck loads during the service life of a bridge.</P>
콘크리트 이방향 휨인장강도 결정을 위한 이방향 휨인장강도 시험법 개선
김지환(Kim,Jihwan ),지광습(Zi,Goangseup),오홍섭(Oh,Hongseob) 대한토목학회 2011 대한토목학회논문집 A Vol.31 No.5A
본 논문에서는 이방향 휨인장강도 시험 시 시험체에 작용하는 등방성 휨인장거동의 구현여부를 실험적으로 증명하기 위해 시험체의 변형률 측정 실험과, 시험체에 등방성 휨인장응력이 작용할 수 있도록 시험법 개선을 위한 연구를 수행하였다. 또한, 개선된 시험법을 적용하여 이방향 휨인장강도와 4점 휨인장강도 시험에 의한 일방향 휨인장강도를 측정하여 비교하였다. 실험 결과, 시험체에 발생하는 등방성 휨인장응력은 시험체의 표면 조건과 뒤틀림 정도에 많은 영향을 받는 것으로 나타났으나, 시험법 개선으로 인해 시험체에 등방성 휨인장응력상태를 확보할 수 있었다. 개선된 이방향 휨인장강도 시험에 의한 일방향 휨인장강도가 일방향 휨인장강도 보다 32% 더 큰 것으로 나타났으며, 분산성은 동일한 것으로 나타났다. In this study, an experiment for the biaxial behavior of specimens was carried out to identify whether the isotropic flexure tensile stress of concrete in the BFT method is feasible. Another experiment for the improvement of the BFT method was conducted to ensure the isotropic flexure tensile stress of BFT specimens during the test. In addition, the biaxial flexure strength of concrete given by the improved BFT method was compared to the uniaxial flexure strength by the four-point bending test. Test results show that the isotropic flexure tensile stress of concrete using the BFT method was highly influenced by the surface conditions and warping of the specimens. Using improved BFT method, we could obtained the isotropic flexure tensile stress of concretes. The biaxial flexure strength of BFT was about 32% greater than the uniaxial flexure strength of the four-point bending test. In the experiment, with the smaller scatter, the improved BFT method gave a reliable biaxial flexure strength like the four-point bending test.