• 한국기계가공학회지
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• 제19권12호
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• pp.113-118
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• 2020

Recently, eco-friendly electric motorcycles have been considered to replace aging gasoline motorcycles to reduce the amount of suspended fine dust in air. However, existing rechargeable battery-powered electric motorcycles have been found unacceptable by users because of their many limitations, such as long charging time, short travel distance per charge, and low driving speed. To overcome the drawbacks of conventional electric motorcycles, this paper proposes an exchangeable battery-powered electric motorcycle and a new frame shape for housing the exchangeable battery. The proposed frame is similar to that of current electric motorcycles; however, the shape and position of the saddle support, battery, and controller mount section are redesigned. The safety of the presented frame is verified through static and dynamic analyses using ABAQUS. In particular, the dynamic analysis is conducted under the most extreme condition among the various operating situations, thus confirming the robustness of the proposed frame design.

• 한국자동차공학회논문집
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• 제20권6호
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• pp.146-155
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• 2012

This study aims to analyze durability by comparing displacement on vibration at driving bicycle frame models of 1, 2, 3 and 4. Among maximum equivalent stresses at 4 kinds of models, model 1 has highest value with 410.39 MPa and becomes 30 times than model 4 with lowest value. The natural frequency number at Model 4 increases more than the other models. Among four models, the number of frequency at model 1 becomes lowest at harmonic vibration with real loading condition. In cases of four kinds of models, the maximum stress is shown near the assembly of rear wheel and the maximum displacement is shown near saddle assembly at this harmonic condition. The structural result about this study can be effectively utilized on the design of bicycle frame by investigating durability and prevention against its damage.

• 한국정밀공학회지
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• 제15권1호
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• pp.169-176
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• 1998

This paper presents the vibration characteristics of a motorcycle body frame. In order to study the excitation mechanism. for example, of handle vibration, discrete models and finite element model are developed for the calculation of natural frequencies and mode shapes of the driveline and body. which can lead to the resonances. Experiments are also conducted to compare with the analytical results From the various kinds of vibration reduction methods, the technical realizable one is presented to reduce the handle vibration responses at the start of driving.

• 한국전산구조공학회논문집
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• 제33권4호
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• pp.209-216
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• 2020

본 논문에서는 CR 쉘 요소 해석 기법을 활용하여 모터사이클 후방프레임의 해석을 수행하였다. CR 쉘 요소 해석기법은 적은 요소수에서 NASTRAN보다 빠르게 수렴하는 결과를 보여주었다. 후방프레임은 수직 방향에 대해 실 주행 조건 시 엔진 RPM과 근접한 고유진동수를 가짐을 보여주었다. 2가지 설계변수를 반영한 세 가지 경우에 대한 해석이 제시되었으며, 보강용 자재는 동일한 중량 변화 내에서 두께 변화에 비해 더 유용한 수단임을 확인할 수 있었다. 본 연구의 구조 해석은 차후 모터사이클 후방프레임의 내구성을 향상하는 설계 개선 연구에 효과적으로 활용될 수 있다.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2022년도 춘계학술대회
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• pp.674-675
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• 2022

본 논문에서는 차량 정차해있거나 저속 주행 중 차량 사각지대에 위치한 객체(보행자, 자전거, 이륜차) 인식 가능하고 초당 30프레임의 빠른 객체 인식 성능을 갖는 DPS(FPGA) 기반 객체 인식 방법을 제시한다.