스피드 쿠션의 형상 최적화에 관한 연구

In case of conventional speed humps, there are problems of grounding because of the induced heavy pitching motion for the buses especially. Therefore it is strongly needed to new vehicle speed reduction schemes. It will be thought that speed cushions do not generally cause excessive discomfort to passengers of large buses, or excessive discomfort to emergency vehicles such as fire service vehicles or ambulances. To optimize the shape of speed cushion which is replaced with the conventional speed humps, the specifications of the domestic vehicles are surveyed. Based on these survey results, several types of speed cushions are designed and the vertical acceleration data are acquired through the 3D-accelerometers. Two-types of design with heights of 75 or 100 ㎜, plateau width of 1400 ㎜, plateau length of 2400 ㎜, ramp slope of 1-in-8 and side slope of 1-in-4 would give the least effect on buses while still causing discomfort for car occupants.