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주진원 ( Jin Won Joo ),유현창 ( Hyun-chang Ryu ),김갑순 ( Gap-soon Kim ) 충북대학교 건설기술연구소 2015 建設技術論文集 Vol.34 No.2
In this paper, the structural test and safety evaluation of aeronautical structures of a composite spoiler were performed for 100% limit load and 150% ultimate load. Supporting jig structures and a loading system were set. up for the test, and 26 rosette gages were attached on the surface of the specimen. In limit load test and ultimate load tests, all principal strains were measured to be below the permissible strain and linear relationships between load and strain ere retained at all load levels. The nonlinear relationship was observed above 160% load level 160%, and the failure of the spoiler was found at the load level of 200% or greater, which indicated that the structure was optimally designed and fabricated.
허리 견인 치료기 시스템 개발을 위한 하중 감지부의 설계
주진원 ( Jin Won Joo ),김지황 ( Ji Hwang Kim ),유현창 ( Hyun Chang Ryu ) 충북대학교 건설기술연구소 2015 建設技術論文集 Vol.34 No.1
Low back pain has increasing tendencye and spine traction device systems are known to be helpful for managing the problem. In this paper, a model of the spine traction device system which is controlled by the force sensor is developed to help prevent the danger to patients. The system consists of mechanical structure including a electric motor, traction wire activated by the control box and a force transducer. Finite element analysis is conducted to obtain strain distributions on the surface of the sensing part. and to predict output voltage of the sensing structure. Calibration tests were performed to evaluate sensitivities, nonlinearity error, hysteresis error and repeatibility of the force tranceducer developed.