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김규성(Gyu-Sung Kim),정준모(Joon-Mo Choung),장영식(Young-Sik Jang),최익홍(Ick-Hung Choe),이준희(Joon-Hee Lee) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
This paper presents static and dynamic measurement of the stress and motion characteristics for crawler<br/> type excavators. Eight scenarios were prepared for static measurement based on two extreme digging<br/> positions, maximum digging reach position and maximum digging force position. The measured items for<br/> static motion included stress, cylinder pressure, cylinder stroke and digging force. The measured static<br/> stresses showed that asymmetric digging force acting on a bucket induced higher stress level than symmetric<br/> one. The measured static pressures and digging forces also agreed with design pressures and design digging<br/> forces, respectively. The dynamic measurement was performed for two types of motion, that is, simple<br/> reciprocation of each cylinder and actual digging motion. The measured items for dynamic motion were<br/> stroke and pressure of each cylinder, stresses on the working device and acceleration on the upper plate of an<br/> arm. The measured data showed that the natural frequency of the excavator highly depended on the hydraulic<br/> stiffness of cylinders. Digging motion tests revealed that digging motion was closer to static motion rather<br/> than dynamic one.