Iskanje po katalogu digitalne knjižnice

Opis: Robot workpiece machining is interesting in industry as it offers some advantages, such as higher flexibility in comparison with the conventional approach based on CNC technology. However, in recent years, we have been facing a strong progressive shift to custom-based manufacturing and low-volume/high-mix production, which require a novel approach to automation via the employment of collaborative robotics. However, collaborative robots feature only limited motion capability to provide safety in cooperation with human workers. Thus, it is highly necessary to perform more detailed robot task planning to ensure its feasibility and optimal performance. In this paper, we deal with the problem of studying kinematic robot performance in the case of such manufacturing tasks, where the robot tool is constrained to follow the machining path embedded on the workpiece surface at a prescribed orientation. The presented approach is based on the well-known concept of manipulability, although the latter suffers from physical inconsistency due to mixing different units of linear and angular velocity in a general 6 DOF task case. Therefore, we introduce the workpiece surface constraint in the robot kinematic analysis, which enables an evaluation of its available velocity capability in a reduced dimension space. Such constrained robot kinematics transform the robot’s task space to a two-dimensional surface tangent plane, and the manipulability analysis may be limited to the space of linear velocity only. Thus, the problem of physical inconsistency is avoided effectively. We show the theoretical derivation of the proposed method, which was verified by numerical experiments.periments.
Ključne besede: robotics, automation, robot machining, workpiece surface polishing, collaborative robot, manipulability, complex surface geometry, motion planning
Objavljeno v DKUM: 25.11.2024; Ogledov: 0; Prenosov: 0

Opis: This diploma illustrates that the success of FC Celje is not merely the result of on-field talent but a comprehensive strategic management framework that supports and enhances every aspect of the club's operations. By examining the club's strategic management practices of the past two seasons, this study provides valuable insights into how sports organizations can achieve and sustain success through effective management practices, financial management, talent development, and community engagement. This thesis's findings underscore that the success of any organization begins with a well-defined strategy. Strategic management provides the framework for setting long-term goals, aligning resources, and navigating the complexities of the sports industry. However, the study also brings to light the equally important role of operational management. The insights gained from the experience of FC Celje demonstrate that a holistic approach, combining strategic and operational management, is essential for achieving and sustaining success. By understanding and applying these principles, sports organizations can build a solid foundation for long-term growth, improve their competitive edge, and enhance their overall performance. This thesis offers a practical guide for other clubs seeking to replicate the success of FC Celje, emphasizing the importance of strategic foresight coupled with meticulous operational execution.
Ključne besede: strategic management. management of sports organizations. strategic planning.
Objavljeno v DKUM: 20.11.2024; Ogledov: 0; Prenosov: 20
Celotno besedilo (1,35 MB)

Opis: The logistics sector should strive for sustainability alongside productivity by protecting its order pickers' health and welfare. Existing storage assignment models are mainly based on the criterion of order picking time and, to a lesser extent, the human factor. In the paper, a solution to a storage assignment problem using a multi-objective model based on binary integer linear programing is presented by developing a solution that considers order picking time, energy expenditure and health risk. The Ovako Working Posture Assessment System (OWAS) method was used for health risk assessment. The downside of solely health risk-optimization is that the average order picking time increases by approximately 33 % compared to solely time-optimization. Contrary to this, the developed multi-objective function emphasizing time has proven to be promising in finding a compromise between the optimal order picking time and eliminating work situations with a very-high risk for injuries. Its use increases the time by only 3.8 % compared to solely time-optimization while significantly reducing health risk.
Ključne besede: productivity, energy expenditure, order picking, order picking system, health risk, OWAS, multi-objective modeling, planning, logistics, ergonomics
Objavljeno v DKUM: 13.08.2024; Ogledov: 109; Prenosov: 11
Celotno besedilo (3,63 MB)
Gradivo ima več datotek! Več...

Opis: Since the non-image-forming (NIF) effect of daylight on the human circadian system is widely accepted, adequate exposure to daylight is now considered one of the elements of a healthy life. In urban environment, one of the prerequisites for adequately lit indoor spaces is the amount and quality of daylight reaching the window, which is highly dependent on the characteristics of the urban environment. The aim of the study was to determine whether there are correlations between urban density (i.e., distance between buildings, building height), façade surface characteristics (i.e., colour and Window-to-Wall Ratios – WWR) and NIF potential of daylight. The study was conducted on a parametric geometric model of a street canyon covering a wide range of characteristics. Simulation results were interpreted using the Relative Melanopic Efficacy coefficient and Sky View Factor. The results indicate that the colour of the opposite façade can substantially impact the resulting NIF potential, especially for orange-red or blue hues. The results of the study show that this influence for building heights between 3 and 8 storeys becomes significant when the width of the urban canyon is less than 25 m and becomes substantially smaller at WWRs above 30 %.
Ključne besede: urban planning, daylight, non-image forming effects of light, circadian light, urban canyon, façade colour
Objavljeno v DKUM: 19.01.2024; Ogledov: 415; Prenosov: 50
Celotno besedilo (14,66 MB)
Gradivo ima več datotek! Več...

Opis: The attempt at a more sustainable land use by increasing urban density may have a negative effect on the daylighting of residential buildings. In densely built areas, obstructions generated by the surrounding buildings can substantially reduce the available amount of daylight, causing poorly daylit spaces and a less healthy indoor environment with higher electricity consumption as a consequence of artificial lighting. European standard EN 17037, Daylight in Buildings, was established in 2018 to ensure appropriately daylit spaces. In this paper, a three-step methodology was developed to investigate the relationship between certain urban planning parameters and the daylighting of a typical room defined by specific (Slovenian) legislative restrictions about its geometry and minimum required window to floor area ratio, in order to establish the maximum densities of residential developments still fulfilling the minimum requirements for daylight provision defined by EN 17037. The results show that a relatively low urban density is required to fulfil the stipulations for minimum daylight provision for the deepest permissible room according to the Slovenian legislation. The impact of the development floor area ratio on the daylighting potential of buildings was identified as significant, followed by the site coverage, development layout, and building typology. Furthermore, the developed methodological approach clearly demonstrates a substantial potential for application in urban planning, with indoor daylight environmental conditions being linked to the planning of residential developments in the earliest stages of the project.
Ključne besede: sustainable urban planning, daylighting, vertical daylight factor, residential developments, solar potential
Objavljeno v DKUM: 14.07.2023; Ogledov: 510; Prenosov: 70
Celotno besedilo (4,82 MB)
Gradivo ima več datotek! Več...