시스템 모델을 활용한 상용차 시트 현가장치 성능 평가

Abstract

Drivers of heavy-duty vehicles sit for long periods of time, and they are occasionally exposed to various types of road conditions, including paved, unpaved, and rugged roads. For this reason, it is necessary to design the seat of a heavy-duty vehicle in such a way that it will effectively protect the driver from secondary vibration at the floor level. In general, the vehicle seat’s ride comfort design includes static support for sitting posture and dynamic isolation of floor level vibration. The pattern analysis of a measured sitting pressure distribution provides a design evaluation of the static support, while the body's force transfer is for the dynamic isolation of the excitation vibration. An essential evaluation of the seat design occurs mainly after the prototype becomes available in the current vehicle design process. At this stage, improving the seat ride design is a slightly difficult task, and it requires much more time and cost. This study introduces a digital pneumatic suspension model for the heavy-duty vehicle seat in order to evaluate ride comfort design at an early stage in a virtual environment.