• 한국기계가공학회지
• /
• 제12권6호
• /
• pp.93-100
• /
• 2013

This paper presents the development process for a bicycle monocoque frame using bolt fastening. Traditionally, bicycle frames have been constructed with metal tubes joined at their ends by welding. These frames have been brazed or soldered onto metal lugs, forming the frame. Because stress loads become greatest at the joint of the bicycle tube frame, joint construction strongly influences frame design and construction. To avoid the inherent problems of material discontinuity at frame joints, numerous designers have attempted to reduce or eliminate the number of joints in tube frames. Nevertheless, the manufacture of high quality, reliable, one-piece and jointless frames has proven difficult and expensive. In this study, a new monocoque frame adapted to a hybrid bike is proposed. The advantage of the monocoque frame, is theat is has a rechargeable battery system that is built into the frame; as a result, the emotional quality for the customer is improved. In order to estimate the design compatibility compared with that of tube frames, structural analysis is performed using finite element method. A prototype based on a modified design has also been made and stability testing has been carried out.

• 항공우주기술
• /
• 제8권1호
• /
• pp.117-131
• /
• 2009

KSLV-1 1단 후방동체 상부 조합체 상세설계를 수행하였다. 동체 사이징 프로그램으로 기본적인 형상을 결정했다. 체결류 기본설계를 통하여 스킨-프레임, 스트링거-프레임의 체결류 선정하였다. 유한요소 프로그램을 통한 프레임 구조해석 및 인터페이스 확인을 통하여 프레임을 설계하였다. 또한 유한요소 프로그램으로 컷 아웃을 고려한 부분을 해석을 수행하여 구조 안전성을 확인하였다. 전단체결류 설계를 위하여 최대 전단하중에 대한 최대전단응력을 유한요소 방법으로 구하였다. 이러한 동체해석 사이징과 유한요소 및 체결류 선정 프로그램을 사용하여 후방동체 상부조합체의 상세설계를 수행하였다.

• 한국자동차공학회논문집
• /
• 제7권9호
• /
• pp.89-96
• /
• 1999

This paper presents the optimization design technique on the joint stiffness and section characteristic factors of chassis frame, by using beam and spring elements in a given design package. Two correction methods are used for the optimization design of chassis frame. First is the equivalent inertia of moment method in relation to the section characteristic factors of joint zones, which are thickness , width and height of frame channel section. Second is the rotational spring element with joint stiffness of joint zones. The CAE example shows that the relationship of section characteristic factors and joint stiffness can effectively be used in designing chassis frame. In this point, if static and dynamic targets are given, the joint-zone and section characteristic factors of chassis frame intended may be designed and defined by using beam and rotational spring elements.