• 한국안전학회지
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• 제31권6호
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• pp.1-5
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• 2016

A bicycle is one of the most popular sporting goods in view of a sport activity and a human health. Metallic materials such as steel, aluminum, etc. were mainly used to the bicycle fork in the past. Nowadays, the carbon fiber reinforced composite materials are widely used to the manufacturing of a bicycle fork to reduce the weight and to increase the efficiency. Safety is a most important design parameter of a bicycle fork even if the weight and cost reduction are important. Bicycle failure may happen at the critical spot of a bicycle fork and cause the accident. In this paper, the composite bicycle fork will be analyzed to secure the safety and detect a critical spot by using the finite element method with Tsai-Wu failure criterion. The stress data were obtained for the laminated composites with various number of plies and fiber orientation under the bending load. Thus, design concept of a bicycle fork was proposed to secure the safety of a bicycle. The finite element analysis results show that the connection area between a steer tube and a fork blade is critical spot, and 75 or more layers of 0 degree are needed to secure the safety of a bicycle fork.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2009년도 추계학술대회 논문집
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• pp.643-646
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• 2009

This study was conducted to simulate the influence of vibration associated with cycling on the body. In this simulation the human model that the riding on a bicycle which have suspension and non-suspension front forks was used. And to arouse impact two kind of bump, 50mm height of radical raised spot and 150mm height of slow raised spot, were used. The vertical displacement of head, the vertical acceleration of head and the torque of neck joint were analysed. The results say that the function of shock absorbing was grater when passing though a 50mm height of radical raised spot then a 150mm height of slow raised spot.

• 대한기계학회논문집A
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• 제34권7호
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• pp.943-946
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• 2010

본 연구에서는 소형자전거의 핸들에 적용할 수 있는 전방 서스펜션을 제안하고 시뮬레이션을 통해 충격흡수 성능을 평가하였다. 서스펜션이 없는 경우, 기존의 전방포크서스펜션이 장착된 경우 그리고 제안된 핸들서스펜션이 장착된 경우 등 3가지 서스펜션 종류에 대해 인체모델을 이용한 주행시뮬레이션을 수행하여 각각의 완충성능을 비교평가 하였다. 시뮬레이션 결과 제안된 핸들 서스펜션의 경우 손과 머리에 전달된 가속도가 기존의 전방포크서스펜션이 장착된 경우보다 크게 측정되었지만 서스펜션이 없는 자전거의 경우보다는 현저히 작게 측정되었다. 이 같은 결과는 제안된 핸들 서스펜션이 상당한 완충 성능을 보여주었으며 이는 경량화가 중요한 소형자전거에 적용이 가능할 것으로 보인다.

• 드라이브 ㆍ 컨트롤
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• 제16권1호
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• pp.7-13
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• 2019

The objective of this study was to present a damped pneumatic suspension, a bike fork suspension, which can adapt itself to incoming road excitations is presented in this paper. It consists of a hydraulic damper and a pneumatic spring in parallel with a linear spring. The study also proposed a variable and switchable orifice, in the hydraulic damper, to select appropriate damping property. Hydraulic-pneumatic circuit model for the bike fork suspension was established based on AMESim, in order to predict its performance. In addition, elastic-damping characteristics of the fork such as spring constant and viscous damping coefficient were computed and compared, for validation, with those evaluated by experiment using the universal test machine. Through simulation analysis and test, it was established that the hydraulic-pneumatic circuit model is effective and practical for development of future MTB suspensions.