Bunching in Lift Systems

Bunching increases passenger waiting time, but does not affect system handling capacity. This paper shows using a practical example, how bunching can increase passenger waiting time. It is quite essential to be able to measure bunching quantitatively, in order to compare the performance of different systems, of different sizes. In order to do this, two measurement coefficients are presented and discussed: simulation based on factor, bx; and measurement based bunching coefficient, BC2. The advantages and disadvantages of both coefficients are outlined, along with methods for implementing them within software packages.