Search results for "kommunikasjon"
showing 10 items of 768 documents
Design, Modelling and Simulation of Electro-Hydraulic Self-Contained Cylinders based on Digital Hydraulics
2018
Master's thesis Mechatronics MAS500 - University of Agder 2018 Nowadays, hydraulic cylinders are mostly powered by a separate HPU and controlled by conventional servo and proportional valves. New trends have been under development the last years. The first trend is self-contained designs where the power unit is integrated in the cylinder design. Digital hydraulics is the second new trend where conventional flow control methods are replaced by simple ON/OFF valves and digital displacement pumps. A totally novel design would be a combination of the two mentioned trends. Designing a hydraulic cylinder that combines both the self-contained method and digital hydraulics is expected to results in…
Modelling of a hydro-pneumatic system for heave compensation
2017
Masteroppgave i mekatronikk MAS500 - Universitetet i Agder 2017 Testing of control systems on simulators has been found to be both cost and time e cient. To get good results from testing, a realistic response from the simulator is important. In this thesis, a mathematical model of a hydropneumatic heave compensation system for such purposes is proposed. The emphasis has been on developing a relatively simple model which is easy to run, but also accounts for important e ects like friction, non-ideal gas behaviour and temperature variation in the gas system. The mathematical model is veri ed against log data obtained from real drilling operations. Then, it is compared to simpler versions to i…
Secondary Control of a Digital Hydraulic Motor for Winch Applications
2018
Master's thesis Mechatronics MAS500 - University of Agder 2018 The reliable traditional hydraulic systems for industrial purposes is being challenged by an emerging technology called digital hydraulics. This technology shows promising improvements in regards to e ciency, especially in comparison to systems dependent on hydraulic pumps or motors with variable displacement. Digital hydraulic motors eliminate the need for a servo valve by connecting each individual motor cylinder directly to the high-pressure and low-pressure line by means of fast-acting on/o -valves. In this thesis, the potential of digital hydraulics is investigated by developing a control system intended for a digital displ…
Fault Diagnosis of an Electrical Winch based on Structural Analysis
2018
Master's thesis Mechatronics MAS500 - University of Agder 2018 This report covers development and implementation of a model-based fault-detection and fault diagnosis algorithm based on structural analysis, providing deeper knowledge of predictive maintenance, which o ers the industry increased uptime and reduced spending. Failure mode and e ect analysis are carried out at component level for an electrical winch. Construction of a Simulink model, used to verify the algorithms, are described in detail including governing equations and implementation. The basis of a structural analysis is outlined and tested on the electrical winch system. Results from the simulation model covers faults in per…
Modelling, Simulation and Control of offshore crane Develop a kinematic and dynamic crane model and study of several control designs
2018
Master's thesis Mechatronics MAS500 - University of Agder 2018 This master thesis is about Modelling, Simulation and Control of a MacGregor Active Heave Compensation (AHC) 250t crane operating on the supply vessel Gran Canyon. The crane model was developed mathematically using robot modeling theory including both kinematic and dynamic equations. This model was developed and simulated in Matlab and Simulink and further compared, where the two models showed equal results. Control designs for an offshore crane can be developed in several ways, but in this thesis the control task only concerns position control of the crane and can be divided into two control tasks. The main goal is to determine…
Dual-speed planetary gearbox for internal mounting in winch drum : design, actuation, and control
2018
Master's thesis Mechatronics MAS500 - University of Agder 2018 Konfidensiell til / confidential until 01.07.2023
Relevance- and Aggregation-based Scheduling for Data Transmission in IEEE 802.15.4e IoT Networks
2017
Master's thesis Information- and communication technology IKT590 - University of Agder 2017 Internet of thing (IoT) is regarded as a new communicating paradigm with Internet connectivity enabling embedded devices to interact with each other on a global scale. IoT has the potential to become the largest producer of information because of a massive number of connected devices with diverse applications ranging from environmental monitoring, home, and building automation. This ubiquitous connectivity requires reliability, efficiency, and sustainability of access to information. As an enabling technology, wireless sensor networks (WSNs) have opened new opportunity with recent technological devel…
A Perspective Review on Integrating VR/AR with Haptics into STEM Education for Multi-Sensory Learning
2022
As a result of several governments closing educational facilities in reaction to the COVID-19 pandemic in 2020, almost 80% of the world’s students were not in school for several weeks. Schools and universities are thus increasing their efforts to leverage educational resources and provide possibilities for remote learning. A variety of educational programs, platforms, and technologies are now accessible to support student learning; while these tools are important for society, they are primarily concerned with the dissemination of theoretical material. There is a lack of support for hands-on laboratory work and practical experience. This is particularly important for all disciplines related …
Human Simulation and Sustainability : Ontological, Epistemological, and Ethical Reflections
2020
This article begins with a brief outline of recent advances in the application of computer modeling to sustainability research, identifying important gaps in coverage and associated limits in methodological capability, particularly in regard to taking account of the tangled human factors that are often impediments to a sustainable future. It then describes some of the ways in which a new transdisciplinary approach within &ldquo
Why have consumers opposed, postponed, and rejected Innovations during a pandemic? A Study of mobile payment Innovations
2021
The highly infectious nature of the COVID-19 virus has made the use of contactless payment methods a health exigency. Yet, consumers are resisting using mobile payments (m-payments) during the pandemic, a confounding behavior that needs to be better understood. The present study explicates this behavior by examining consumer resistance to m-payments during the COVID-19 pandemic. In addition, it provides more granular findings by measuring three levels of resistance/non-adoption, namely, postponement, opposition, and rejection. In this way, the study adds depth to the literature, which has largely examined resistance at an aggregate level to yield generic findings. Toward this end, the study…