IDLE 진동 저감을 위한 스티어링 시스템 설계 최적화 연구

High stiffness and light weight vehicle is a major target in the refinement of passenger cars to meet customers' contradictable requirements between NVH Performance and Fuel Economy. This paper describes the analysis approach process for idle vibration reduction through the data level of steering system stiffness. The fundamental solution for this problem is separation of steering column frequency from resonance of body structure, and high stiffness of steering system takes advantage of reduction of idle vibration level. Traditionally. the target of the steering system stiffness is set by benchmarking of a competitive vehicle and frequency range from resonance of engine idle rpm. According to the sensitivity of design factors for high stiffness of steering system. we can suggest the design guideline about steering column and support parts by using mother car at initial design stage. And we established techniques of analysis on steering system and evaluated the level of accuracy of analyses through correlating the test an analyses results. It makes possible to design the good NVH performance vehicle at initial design stage and save vehicles to be used in tests. These improvements can lead to shortening the time needed to develop better vehicles.