THE EFFECT OF FIELD OBSERVATION METHODS ON DETERMINING NUMERIC CHARACTERISTICS OF THE LAW OF HUMAN FLOW VELOCITY DISTRIBUTION

The development of the methodology of process standardization (or some other descriptions) that do not yield unambiguous (determined) technical regulation requires a careful consideration for the scholastic nature of its natural dynamics especially when the lives of people depend on the values of the parameters in the systems designed for the maintenance of their safety. In fire safety standardization such processes include, first and foremost, the movement of people during evacuation and the dangerous fire factors spread that determine its timeliness (tRSET  tASET) and absence of congestions (Di  Dq,max). The example of comparing visual and video methods of determining calculation values of human flow velocity has allowed to bring to light the methodological differences in establishing the laws of unknown random velocity value distribution (Vp), whose arguments are the random values of physical parameters observed in its methods: in a visual method — a probable time (&t) with a constant length of a route section (&lp = const) taken in this amount of time, in video method — of a probable route length (lp) with fixed time input (&t = const). Consequently, the random value of human flow velocity has a normal distribution at all the density intervals. With the help of the given example this article demonstrates that when we make calculations using average values of random variables in inverse proportion, the relation: (distance) = (velocity)  (time) is valid only in the case if one variable has the arithmetic mean and the other — the harmonic mean.