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Senast inlagda

Characterization of Traffic Dynamics in Automated Guided Vehicle Systems: Analyzing and visualizing congestion patterns using causal chains and spectral clustering
(2025) Andersson, Calle; Veldhuis, Benjamin
Automated Guided Vehicle (AGV) systems have revolutionized warehouse logistics by enhancing efficiency and reducing labor costs. However, the complexity of these systems can lead to traffic congestion, adversely affecting performance. This masters thesis investigates traffic dynamics in AGV systems using recursive data structures, interactive visualization, and spectral clustering; with the final aim being to describe and analyze congestion in these systems. Our study shows promise in streamlining design processes by providing more sophisticated analysis tools, data-structures for describing congestion, as well as novel ways to uncover and characterize large-scale traffic dynamics in the domain. Ultimately, this project could act as a stepping-stone for further research, by laying the ground-work for applying more formal methods.
Analytical investigation for application of Hollow CLT elements
(2025) Elhajj , Mohannad; Sterneling , Elliot
The construction sector today are responsible for a large portion of the global carbon emissions, which leads to a higher demand for making the industry more sustainable. With these increasing demands put a higher pressure on reducing the raw material used in construction. Timber is in comparison with others a more sustainable material because it is relatively eco-friendly. This thesis aims to investigate the application and extent of where and when it is appropriate to implement air gaps into the cross layers of CLT elements in relation to structural and hygrothermal performance, as well as how the evaluation should be structured to acquire the most volume efficient layout. The optimal arrangement for enhancing both structural and environmental performance was determined by methodically evaluating important elements like heat transmission, moisture transport, and material interactions. The investigation of structural performance showed that air gaps could be applied to a meaningful extent in most situations and still satisfy structural requirements saving approximately 20% of the material usage, where even with constrained widths of the air gaps, a significant reduction of the volume in relation to its solid counterpart. For the Hygrothermal performance no major impact could be observed from the air gaps other than the thermal and moisture storage capacity decreased.
A Blind Spot in Construction: An investigation into the prevalence and perception of construction logistics management
(2024) Campbell, Erik John; van der Horst, Floris
Logistics is an integral part of any current day construction project, with a growing importance as a result of urbanization and sustainability efforts. However, it is still unclear as to how these logistical tasks are managed on construction sites on a daily basis. Combining data from a set of on-site observations with qualitative data from interviews with members of site management, logistics experts, and recruiters, we highlight the prevalence and perceptions regarding logistical management in construction. Following which we can conclude that logistics takes up a significant amount of supervisors’ time and effort, while not being met with requisite presence in recruitment and job specifications. Currently logistics is often seen as an activity to enable other work efforts, resulting it often being performed in a reactive fashion. Instead, allocating logistics to those specialised in it or building further knowledge on how to interact with logistics, can provide multiple benefits connected to quality, cost, and time by further planning and streamlining logistics flows ahead of time
How contractors implement environmentally sustainable building: A study of compliance with environmental requirements across project organizations for municipal construction projects
(2024) Björk Filander, Linn; Mattsson, Emilia
The continuous growth of the building and construction industry contributes to the sector accounting for one-third of all global greenhouse gas emissions. To reduce emissions and achieve more environmental sustainability in construction, environmentally sustainable directives must be followed globally and nationally. Today, clients are imposing increasingly stringent environmental requirements on their projects, posing a challenge for contractors to meet these demands and align the entire project organization towards the same goal. The study aims to investigate how environmental requirements are followed and complied with throughout the process of construction projects, as well as what drives and hinders their successful fulfillment. To investigate this, a case study was conducted in collaboration with Veidekke, focusing on two public projects located in Gothenburg, Sweden. Relevant actors from both projects were interviewed, including subcontractors, suppliers, site managers, and environmental managers. Furthermore, documents from both projects, such as contracts and environmental plans, were analyzed. The study finds that formulation and organizational issues hinder adherence to environmental requirements in the projects. It also highlights inconsistencies and lack of clarity in contract formulation and implementation, emphasizing the necessity of a monitoring system and clear production follow-up procedures, with a focus on leadership. To enhance compliance with environmental requirements in construction projects, contractors must clearly frame environmental standards for their subcontractors and suppliers. Early inclusion could ensure improved integration of the requirements throughout the project. Furthermore, it is advantageous to have a responsible person in the organization who is solely focused on environmental issues to ensure thorough attention already from the procurement phase into the production phase. An individual who is also responsible for monitoring routines and motivating environmental work throughout the project organization.