No abstract

This paper defines the basis for zipline arresting devices. Considering that there is currently no legal regulation in Serbia that defines devices for zipline braking and arresting, an excerpt from foreign standards are given in the first part of the paper. This is followed by an overview of existing solutions of arresting systems, as well as examples of patented solutions. As it is necessary to know the velocity of the passenger at the beginning of braking, the paper gives a basis for determining the kinematic parameters of the passenger. The analysis of kinematic parameters consists of two parts - the first one, which includes static analysis based on catenary theory, and the second, which takes into account inertial forces, movement resistance, air resistance, the position of a passenger during lowering, tightening force, etc. Finally, recommendations for the selection of zipline arresting system are given, as well as an example of concrete zipline which was built on Fruška Gora.

U ovom radu je prikazana analiza uticajnih veličina, postupak modeliranja sistema zipline-a, kao i postupak određivanja parametara kretanja. Sam proračun bazira na teoriji lančanice, sa specifičnostima razvijenim za proračune žičara i kabel-kranova, odnosno transportnih sistema sa tzv. "horizontalnim užetom". Kao ilustracija sprovedene analize prikazani su rezultati dobijeni na osnovu teorijske postavke merodavnog modela uz primenu računarskih simulacija za konkretne uslove zipline-a, čija je izgradnja bila predviđena na Fruškoj Gori. U simulacijama je vršeno variranje vrednosti značajnih veličina (težina, otpor točkova, otpor vazduha, vetar, zatezanje užeta, položaj tela osobe, ...) za različite slučajeve korišćenja zipline-a. Rezultati i izvedeni zaključci mogu poslužiti kao polazna osnova za projektovanje ovakvih sistema.

No abstract

Modelling of the dynamic behaviour of elevators with high lifting velocities (contemporary elevators in building construction and mine elevators) is a complex task and an important step in the design process and creating conditions for safe and reliable exploitation of these machines. Due to high heights and lifting velocities, the standard procedures for dynamic exploitation are not adequate. With the purpose of identifying the basic parameters of the dynamic model (stiffness and damping), a unique method was applied, based on experimental measures for a concrete elevator. Due to the verification of this procedure, the experiment was conducted on a mine elevator in RTB Bor, Serbia. Simulations of the dynamic behaviour of an empty and loaded cage are presented using the obtained computational-experimental results