Iskanje po katalogu digitalne knjižnice

Opis: In the article “New Technological Approach to Cable Car Boarding”, the authors attempted to correctly design the curve geometrically along which the rope moves through the station during the deceleration of cabins with attaching platforms in a central position, primarily intended for mass public transport. Since the suspension continuously connects the cabin and the rope during cabin deceleration, the rope moves at a constant speed along a special curve that enables the cabin to stop in the central position. This curve is symmetric with respect to the longitudinal axis of the station. However, the authors found that in the previous article presenting this cable car system, an error was made in the geometric design of the rope path curve, which the original authors were not aware of at the time. They determined that, in the presented example, a suspension length of 8 m was too short for the combination of rope speed of 5 m/s (cable car speed) and cabin deceleration of 0.5 m/s2. This article revisits this geometric problem in greater detail. The study shows that not every combination of rope speed, suspension length, and cabin deceleration in the central position functions correctly. First, the boundary conditions and spatial constraints of the rope path curve were defined. Based on the upper bound and lower bound rope path lengths, the optimal or correct shape of the rope path curve was determined geometrically. The study concludes that for a given combination of rope speed (cable car speed) and cabin deceleration, only one suspension length is suitable. In the case of a rope speed of 5 m/s and cabin deceleration of 0.5 m/s2, the correct suspension length is 16.85 m. The authors also found that the result depends on the time interval used in constructing the curve.
Ključne besede: cable cars, rope path curve, geometric modeling, cabin deceleration, attaching platforms, suspension length optimization, public transport, high-capacity transit
Objavljeno v DKUM: 18.12.2025; Ogledov: 0; Prenosov: 2
Celotno besedilo (1,51 MB)
Gradivo ima več datotek! Več...

Opis: Contemporary societies, whether they have reached advanced levels of economic and social development or are still developing, need to prioritise the implementation of circular economy practices. This will facilitate the shift towards regenerative, sustainable, and closed-loop industrial systems. For now, there are some efforts to encourage patterns of production and consumption through changes in economic trends, development of institutional frameworks, harmonising regulations in the field of environmental protection, and raising the level of social awareness to achieve, above all, greater efficiency of resources. Extensive literature that deals with monitoring the implementation of the circular economy already indicates the existence of numerous barriers in this process but also notices some incentives for raising the degree of circularity of the observed systems. In this paper, the question of whether a single value can represent the level of circularity of the chosen material/product chain is researched. An overview of barriers and drivers for implementing circular economy strategies is given to structure a proper metric framework in correlation to the research question. The objective was to simplify the monitoring of circularity by developing a unique index for comparing material/product chains in similar systems. This was accomplished by using the circular material use (CMU) rate introduced in the European Union and modifying it for financial data calculation. As a result, the circular economy index, which covers all 9R strategies (CEIR), is obtained. The practical verification of model applicability was shown by determining the degree of circularity achieved for passenger cars in the four observed EU countries.
Ključne besede: barriers, 9R framework, circular material use rate, circular economy index, passenger cars
Objavljeno v DKUM: 19.03.2024; Ogledov: 296; Prenosov: 118
Celotno besedilo (671,51 KB)
Gradivo ima več datotek! Več...

Opis: This bachelor´s thesis describes the development of Hydrogen Fuel Cell powertrain based on the case of the Tushek TS900 hybrid car. We wanted to see if a hydrogen fuel cell-powered vehicle could achieve comparable performance compared to an existing hybrid vehicle. We have built a Fuell Cell propulsion model for the high-performance sports car Tushek TS900, then we presented the basics and principles of the powertrains itself, and its connections. We performed vehicle acceleration simulations and compared them with a hybrid powertrain powered vehicle.
Ključne besede: hydrogen fuel cells, sports cars, powertrain design, car characteristics, driving simulation
Objavljeno v DKUM: 16.02.2022; Ogledov: 745; Prenosov: 92
Celotno besedilo (3,24 MB)