Condition analysis and basis for selection of zipline arresting devices

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.

Electric Trolley Prototype for Goods and People Transport on Ziplines

“…The trolley riders experience fast accelerations during the descent on the ziplines made up of a single rope without pulleys to support the trolley sliding down to the valley, typically at relatively high speed with the passenger tied to it. In this configuration, the brake has to be on the trolley, and it is common for the centrifugal brake to act when a certain speed is reached, so the final speed is fixed [15]. The choice of the trolley's maximum speed is fundamental for passenger safety, and it has to be calibrated with the spring at the end of the rope in order not to exceed the maximum acceleration, chosen not to be uncomfortable for riders, during the final deceleration.…”