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The Journal of The Korea Institute of Intelligent Transport Systems Vol.8 No.1 pp.37-44
두 개의 지점 검지기를 이용한 연속류 구간의 밀도측정 방안
Density Measurement for Continuous Flow Segment Using Two Point Detectors
Abstract
Density is the most important congestion indicator among the three fundamental flow variables, flow, speed and density. Measuring density in the field has two different ways, direct and indirect. Taking photos with wide views is one of direct ways, which is not widely used because of its cost and lacking of proper positions. Another direct density measuring method using two spot detectors has been introduced with the concept of instantaneous density, average density and measurement interval. The relationship between accuracy and measurement interval has been investigated using the simulation data produced by Paramics API function. Finally, density measurement algorithm has been suggested including exponential smoothing for device development.
