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조인트 DB와 다분야 구속 조건 최적설계를 이용한 차체 설계 프로세스 개발
박현정(Hyun-Jung Park),최연욱(Yeon-wook Choi),허승진(Seung-Jin Heo),이경원(Kyungwon Lee),김정호(Jung-Ho Kim),이창건(Changkun Lee),김용석(Yongsuk Kim) 한국자동차공학회 2014 한국자동차공학회 학술대회 및 전시회 Vol.2014 No.11
To achieve effectiveness and optimized design for light weight vehicle body, many concept design methodologies have been studied. However, study using database would be not conducted yet. Therefore, this paper presents body structure development process using joint database and multi-disciplinary design optimization. The suggested process was constructed with 4-phase. First phase is knowledge-based template construction. Knowledge-based template is consisted of geometry database and performance database. To construct joint database, it is necessary to evaluate joint’s cross section. In second phase, body structure conceptual design using joint database is progressed. For joint’s section selection, what-if design method is used. In addition, implicitly parametric geometry model is used to realize easily shape or topology changes. Parametric geometry model was constructed using SFE CONCEPT. In the last phase, body structure detail design using robust design optimization method is fulfilled. Considering the deviation of thickness design variables, six-sigma terms added into the inequality constraints for bending stiffness and torsional stiffness and equality constraints for 1st bending mode and 1st torsion mode.
차량 충돌 방지용 24㎓ 레이더 주파수대의 근거리 전파손실특성
하덕호(Deock-Ho Ha),류지열(Jee-Youl Ryu),김성운(Sung-Un Kim),최연욱(Yeon-Wook Choi) 한국정보기술학회 2011 한국정보기술학회논문지 Vol.9 No.8
In this paper, we describe the short range propagation loss characteristic of 24㎓ frequency band used for automotive collision avoidance radar (ACAR). To investigate the radio propagation characteristic of ACAR signals, we used 24㎓ UMCW (Un-Modulated Continuous Wave) signals using by several polarized antenna combinations. To detect the accurate message data for safety guiding ACAR, we analyze and investigate the optimum receiving condition from the short range UMCW signal of the 24㎓ frequency. From the measurement analysis, it can be clearly seen that the short range UMCW signal can be encountered to multipath interference due to scattering rays from the ground plane and adjacent moving obstacles. In addition, it was also found that the received signal strength of circularly co-polarized antenna shows the most strong envelopes and best fading reduction effect.