International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

Zipline is an adventure activity that involves a steel cable suspended between two anchor points at varying heights and distances. Participants are secured to a trolley that moves along the cable, primarily driven by gravitational force. This sport, often classified as an adrenaline activity, has become increasingly popular for recreational use.
This paper presents a comprehensive analysis of the key parameters influencing zipline systems, including the modelling of movement dynamics and the selection of essential components. Utilizing the principles of the catenary curve, our approach draws parallels with established methodologies in cable car and cable crane systems.
To ensure the quality design and safe operation of zipline systems, it is crucial to analyse various factors, such as participant weight, rope anchoring methods, tension force, and angle of inclination, movement speed, release position, trolley wheel resistance, air resistance, temperature effects, and geographical considerations.
As a case study, we detail the findings from a theoretical model, validated through computer simulations, focusing on the specific conditions of a zipline constructed in Theth, Albania. Our results provide valuable insights into the design and safety protocols necessary for effective zipline operations.

This paper describes the design and practical implementation of AC/DC/DC converter in mode of arc welding. An analysis of the operation of AC/DC/DC converter and its input/output characteristics are determined with computer simulations. The practical part is con- sisted of AC/DC/DC converter prototype for arc welding with output power of 3 kW and switching frequency of 64 kHz. The operation of AC/DC/DC converter is validated with experimental measurements.