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김대희(Dae-Hee Kim),탁태오(Tea-Oh Tak),국민구(Min-Gu Kuk),전형호(Hyung-Ho Chun),김종갑(Chong-Kap Kim),조성식(Sung-Shik Cho),조남영(Cho Nam-Young) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
In order to predict required handle torque of a steering system at design state, mass of vehicle, suspension geometry, hydro-mechanical characteristics of a power assisted system should be considered. In this research, a multibody approach to calculate handle torque and rackbar force as a function of tire contact patch friction torque is proposed. For validation, the computed rackbar force and handle torque are compared to the measured values obtained through actual vehicle test, and they showed good correlation. This computational procedure will be implemented in a steering system analysis and design software to predict handle torque and determine required suspension geometry and power assist system characteristics.
인체의 연계작용을 고려한 프리텐셔너를 가진 시트벨트 시스템의 동역학 해석 및 실험적 검증
국민구(Min-Gu Kuk),탁태오(Tea-Oh Tak),박재순(Jae-Soon Park),김대희(Dae-Hee Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
To improve passenger safety, seatbelt systems with pre-tensioner that tightens seatbelt webbing using explosives just before collision are widely adopted. Even though seatbelt must not be unlatched without passenger's operation, release of a buckle due to explosion of pre-tensioner takes place in some situations resulting in serious injury to passengers. To prevent the unintended unlocking, a pendulum like part called anti-g mass is attached to the buckle to block displacement of release button. In this study, the unlocking conditions of anti-g buckle when pre-tensioner explodes has been theoretically investigated. Through multibody model of the seatbelt system incorporating every detailed part of the buckle, dynamic analysis of the seatbelt system with pre-tensioner has been performed including the driver's body model that interacts with seatbelt system. The simulations results has been validated through actual sled test with driver dummy and the seatbelt system.
동작분석기법을 이용한 조향동작에 대한 팔의 생체역학적 특성분석
김영환(Younghwan Kim),탁태오(Tea Oh Tak) 대한기계학회 2011 大韓機械學會論文集A Vol.35 No.11
본 논문은 장비의 동작분석기법을 이용하여 운전자가 핸들을 돌릴 때 팔의 관절 운동에 대한 생체역학적 해석을 수행하였다. 모형 운전석에서 운전자가 핸들을 돌릴 때 모션 캡쳐(motion capture) 시스템을 이용하여 팔의 3차원 운동궤적을 구하고, 이 결과를 이용하여 팔의 근-골격계 모델에 대한 역기구학 해석과 역동역학 해석을 수행함으로써 팔 관절의 변위와 관절 토크의 크기를 계산하였다. 각 관절의 회전 운동은 동시에 복합적으로 발생하며, 관절 운동의 크기의 관점에서 팔꿈치 관절의 회내-회외, 어깨 관절의 내전-외전, 굴곡-신전, 손목 관절의 굴곡-신전 등이 주요한 운동임을 확인할 수 있었다. 모형 운전석의 운전 자세, 핸들의 각도 및 좌석에 대한 상대적 위치와 관련된 설계변수에 대한 관절운동의 민감도 해석을 통하여 운전 자세와 핸들의 위치가 조향 동작에 미치는 영향을 정량적으로 분석하였다. Biomechanical analysis of arm motion during steering was performed using a motion analysis technique. Three-dimensional position data for each part of arm are fed into an interactive model combining a musculoskeletal arm model and the mechanical steering system to calculate joint angles and torques using inverse kinematic and dynamic analyses, respectively. The analysis shows that elbow pronation/supination, wrist flexion/extension, shoulder adduction/abduction, and shoulder flexion/extension have significant magnitudes. Sensitivity analysis of the arm joint motion with respect to seating posture and steering wheel configuration is carried out to investigate the qualitative influence of the seating posture and driver's seat configuration on the steering behavior.
유리의 동특성을 고려한 기판 레이저 배기홀 가공 장비의 동역학 해석
국민구(Min-Gu Kuk),탁태오(Tea-Oh Tak),김대희(Dae-Hee Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
PDP glass handling system that can handle large size glass fast and accurately is needed in many PDP manufacturing equipments to improve productivity. For exhaust hall drilling equipments that use laser power instead of conventional mechanical drill, more care should be taken in handling the glass due to the holes in the glass. To a predict dynamics of glass handling equipment accurately, interactive analysis that includes both glass and handling mechanisms are required. Due to high brittleness of PDP glass, its material properties such as Young's modulus and Poisson's ratio should be determined through some experimental procedures such as 3 point bending test. The FEM model of the glass was combined to the glass handling mechanism that can interactively analyze elastic behavior of glass under the action of handling mechanism. The impact forces, stress, deflections of the glass was calculated at loading and aligning stages of exhaust hall drilling. This glass and mechanism model can be used to improve design of various glass handling mechanisms.
프리텐셔너가 장착된 시트벨트 시스템의 관성잠김 안전버클 개발
국민구(Min-Gu Kuk),탁태오(Tea-Oh Tak),박재순(Jae-soon Park),신승언(Seung-Eon Shin),김대희(Dae-Hee Kim),김종각(Jong-Kag Kim),유병개(Byoung-Gae You),김철현(Chul-Hyun Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
To improve passenger safety, seatbelt systems with pre-tensioner that tightens seatbelt webbing using explosive just before collision are widely used these days. Even though seatbelt must not unlatched without passenger's operation, explosive power of pre-tensioner can cause unlocking of a buckle. To prevent the unlocking, an Anti-g mass that blocks displacement of the release button has been attached to the buckle. In this study, the dynamics and statics of locking mechanism associated with operation of Anti-g buckle has been theoretically investigated, and important design variables that affect the operation of Anti-g buckle have been identified. Through the total seatbelt system's dynamic simulation using force and displacement inputs obtained from seatbelt sled test, design of the proposed Anti-g buckle has been validated.
탁태오,박재순,국민구,김대희,신승언,최석 강원대학교 산업기술연구소 2006 産業技術硏究 Vol.26 No.B
Motorized retractors enhance the safety of passengers by removing the slack of webbing and by holding upright driving position. Reliability of a driving mechanism that includes one-way clutch between the driving motor and webbing is directly linked to the safety of passenger. In this research, conditions for locking one-way clutch. and also conditions for sustaining locking are theoretically investigated. The operation of a motorized retractor under realistic conditions is simulated in order to validate the proposed retractor design.
탁태오,박재순,국민구,김대희,신승언,최석 강원대학교 산업기술연구소 2006 産業技術硏究 Vol.26 No.A
Motorized retractors enhance the safety of passengers by removing the slack of webbing and by holding upright driving position. Reliability of a driving mechanism that includes one-way clutch between the driving motor and webbing is directly linked to the safety of passenger. In this research, conditions for locking one-way clutch, and also conditions for sustaining locking are theoretically investigated. The operation of a motorized retractor under realistic conditions is simulated in order to validate the proposed retractor design.
프리텐셔너가 장착된 시트벨트 시스템의 관성잠김 안전버클 개발
탁태오,국민구,김대희,박재순,신승언,최석 강원대학교 산업기술연구소 2006 産業技術硏究 Vol.26 No.B
To improve passenger safety, seat belt systems with pre-tensioner that tightens seat belt webbing using explosive just before collision are widely used these days. Even though seatbelt must not unlatched without passengers' operation. explosive power of pre-tensioner can cause unlocking of a buckle. To prevent the unlocking, an anti-g mass that blocks displacement of the release button has been attached to the buckle. In this study, the dynamics and statics of locking mechanism associated with operation of anti-g buckle has been theoretically investigated, and important design variables that affect the operation of anti-g buckle have been identified. Through the total seat belt system's dynamic simulation using force and displacement inputs obtained from seat belt sled test, design of the proposed anti-g buckle has been validated.
프리텐셔너가 장착된 시트벨트 시스템의 관성잠김 안전버클 개발
탁태오,국민구,김대희,박재순,신승언,최석 강원대학교 산업기술연구소 2006 産業技術硏究 Vol.26 No.A
To improve passenger safety, seat belt systems with pre-tensioner that tightens seat belt webbing using explosive just before collision are widely used these days. Even though seatbelt must not unlatched without passengers' operation. explosive power of pre-tensioner can cause unlocking of a buckle. To prevent the unlocking, an anti-g mass that blocks displacement of the release button has been attached to the buckle. In this study, the dynamics and statics of locking mechanism associated with operation of anti-g buckle has been theoretically investigated, and important design variables that affect the operation of anti-g buckle have been identified. Through the total seat belt system's dynamic simulation using force and displacement inputs obtained from seat belt sled test, design of the proposed anti-g buckle has been validated.