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반복학습제어와 할바흐 자석 배열 스튜어트 플랫폼을 이용한 차량 진동 신호 재현
고병식(Ko, Byeongsik),강수영(Kang, SooYoung) 한국소음진동공학회 2013 한국소음진동공학회 논문집 Vol.23 No.5
This paper presents the replication of a desired vibration response by iterative learning control (ILC) system for a vibration motion replication actuator. The vibration motion replication actuator has parameter uncertainties including system nonlinearity and joint nonlinearity. Vehicle manufacturers worldwide are increasingly relying on road simulation facilities that put simulated loads and stresses on vehicles and subassemblies in order to reduce development time. Road simulation algorithm is the key point of developing road simulation system. With the rapid progress of digital signal processing technology, more complex control algorithms including iterative learning control can be utilized. In this paper, ILC algorithm was utilized to produce simultaneously the six channels of desired responses using the Stewart platform composed of six linear electro-magnetic actuators with Halbach magnet array. The convergence rate and accuracy showed reasonable results to meet the requirement. It shows that the algorithm is acceptable to replicate multi-channel vibration responses.
컨버터블(Convertible)형 차체의 개념 설계 및 동흡진기의 효용성
김태욱(Tae-Uk Kim),고병식(ByeongSik Ko) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_2
The strategy of vehicle vibration is quite different between a convertible and a sedan in the view of vehicle structure due to the limitations in design concept. An investigation has been carried out to solve the problem of design concepts of a convertible using FEM. The design concept of a convertible is applied to normal mode analysis and forced response analysis compared with a sedan. The static and dynamic stiffness of a convertible vehicle is much lower than those of a sedan. It is found that vibration levels in steering wheel and seat track are very high based on the forced response analysis. These vibration levels are caused by the first vibration mode of body that is very important to get NVH target. Finally the dynamic absorber is applied to reduce the vibration levels and to enhance the dynamic stiffness.<br/>