Computer Modeling of Dynamic Processes of Passenger Elevators at Casual External Influence

Passenger elevators of multi-storey buildings are objects of increased danger; safety of operation and user comfort are determined by the necessary and sufficient volume of preventive maintenance works. The structure of maintenance in its content and time interval of each specific elevator type is determined by the accumulated volume of force impacts on the drive and other supporting elements of the mechanism within the entire operating time. The aim of the work is to establish the regularities for the passenger elevator's equivalent dynamic loads formation, while taking into account the random nature of the input effects when calling the cabin and serving the call, in particular, the static tension of the ropes and the payload from passengers weight in each cycle, as well as the calls interval in the elevator use. Classification features of the elevator operation characteristic modes during the day are described; the equations of dynamics at start-up, steady motion and braking of `drive-trans mission-rope-cabin-counterweight' system are composed. A relation is proposed for calculating the equivalent load of the elevator power units, which takes into account changes in the load in each cycle from time to time and the frequency of the system use. An algorithm and a program for the cycle-by-cycle modeling of the elevator operating mode are developed, in which random discrete values of the cabin parking storeys, call and destination, continuous random values of the ropes end load and the interval of calls receipt are generated. The modeling results indicate a significant effect of the number of storeys of a residential building, the density of its occupancy, the main parameters and modes of using the lift on the value of the equivalent load. The main regularities in determining the equivalent loads of the elevator power units are formulated as the basis for individual design of the structure and content of its maintenance and repair system.